Manual / Guide · 1975

BSP 551-100-101: 756A PBX Task Oriented Practice, Vol. 2, Repair

Trouble indicators, repair and adjustment for the 756A crossbar PBX.

Author: AT&T (Bell System Practices)
Year: 1975
Type: Manual / Guide
Credit: The Telecommunications Archive (telecomarchive.com), BSP archive

I - ' '··· i r ,1 ·.·----- BELL SYSTEM PR~CTICES AT& TCo Standard ~·~···'·'---·--- 551-100-101 Issue 1, May 1975 - ,__.._,_..: ~·-~~ .-~·1"-•· ..... · Task Oriented Practice (TOP) 75oA PBX VOLUME 2 OF 2 REPAIR ROUTINE TAS~~IST ACCEPTABLE TASK-LIST,. ·): VOLUME 1 VOLUME 1 ..,, ....... .• ~> . . -··-~.~-.<~·.:: SERVICE ORDER LIST TROUBLE INDICATOR LIST • VOLUME 1 ... :•J 095 :--~- --- .. ,, ~- ~ i 551-100-101 Issue I, May 1975 BELL SYSTEM PRACTICES AT&TCo Standard Task Oriented Practice (TOP) 756A PBX VOLUME 2 OF 2 REPAIR NOTE Before using TOP for the first time, complete the TOP-USER Plant Training Course-PTC No. 278. This material is prepared for Bell System purposes and is for the use of Bell System employee:;; only. Its distribution is in no sense a publication. Neither the material nor any portion thereof is to be reproduced in any ·form by others without the written permission of the American Telephone and Telegraph Company. Printed in U.S.A. PROCEDURE NUMBER TROUBLE INDICATED Alarm troubles should normally be cleared fiist. For general trouble clearing information (including marker), refer to General 756A PBX Trouble Clearing-TAD-163. ALARM LAMP ON AT SLIDE 1: COAL (Camp-on Alarm Lamp) TAP-100 EXT (External) TAP-101 FA _(Fuse Alarm) TAP-102 JRAL (Junctor Register Alarm Lamp). TAP-103 LAL1 (Link Test Alarm Lamp 1) TAP-104 LAL2 (Link Test Alarm Lamp 2) TAP-105 MAL (Miscellaneous Alarm Lamp) TAP-106 ' (Power Alarm) TAP-107 RLAL (Release Alarm Lamp) TAP-108 TRAL (Tens Release Alarm Lamp) TAP-109 TAL (Tens Alarm Lamp) TAP-110 TS (Test) TAP-111 PA TOAL (Time-out Alarm Lamp) TAP-112 TAAL (Trouble Advance Alarm Lamp) TAP-113 UAL (Units Alarm Lamp) TAP-114 UAL1 (Units Alarm Lamp 1) TAP-115 UAL2 (Units Alarm Lamp 2) TAP-116 XCAL (Cross-check Alarm Lamp) TAP-117 (continued on page 2) ·Issue 1 TROUBLE INDICATOR LIST- 756A PBX J May 1975 551-100-101 TIL PAGE 1 of4 095 PROCEDURE NUMBER TROUBLE INDICATED ALARM LAMP ON AT CONSOLE: TR (Trouble) -Check Other Alarm Lamps in Slide 1 ARB (All Registers Busy) TAP-118 F AlLURE REPORTED WITH PROGRESS OF CALL FROM: Attendant Trunk-to-Station TAP-119 CO Trunk-to-Station TAP-120 Incoming Ringdown Tie Trunk-to-Station TAP-121 Outgoing Manual and Dial Selected Tie Trunk TAP-122 Station-to-Attendant Trunk TAP-123 Station-to-CO Trunk TAP-124 Station-to-Station TAP-125 FAILURE REPORTED WITH: Attendant Audible Signal TAP-126 Attendant Can't be Called on CO Trunk TAP-127 Attendant-Controlled Dial Conference TAP-128 Attendant Direct Station Selection TAP-129 Attendant Dial Back Trouble TAP-130 Attendant Transfer TAP-131 Attendant Trunk-to-Station Hold TAP-132 Busy-Tone Trunk TAP-133 (continued on page 3) Issue 1 TROUBLE INDICATOR LIST -756A PBX -----~--=--- I May 1975 551-100-101 TIL PAGE2of4 095 PROCEDURE NUMBER TROUBLE INDICATED FAILURE REPORTED WITH: (cont'd) Busy Verification TAP-134 Call Transfer Individual (Was Station Dial Transfer) TAP-135 Camp-On TAP-136 Console CO or Attendant Trunk Lamp TAP-137 Console Key TAP-138 CO Trunk Release TAP-139 Dial 0 TAP-140 Intercept 'rAP-141 Meet-Me-Type Conference TAP-142 Message Waiting TAP-143 Night Service TAP-144 Paging TAP-145 PBX Dialing TAP-146 PBX Dial Tone TAP-147 Power Failure Transfer TAP-148 Recorded Telephone Dictation TAP-149 Ringdown Tie Trunk TAP-150 Station Can't Be Called TAP-151 Station Can't Call Out on CO Trunk TAP-152 Station-Controlled Dial Conference TAP-153 Station False Busy TAP-154 (continued on page 4) Issue 1 TROUBLE INDICATOR LIST- 756A PBX I May 1975 551-100-101 TIL PAGE3of4 095 PROCEDURE NUMBER TROUBLE INDICATED FAILURE REPORTED WITH: (cont'd) Station Inward Restriction TAP-155 Station Message Register TAP-156 TOUCH-TONE® TAP-157 Traffic Measurement TAP-158 Traffic Register TAP-159 Trunk Answer From Any Station (Was Remote Trunk Answer) TAP-160 3A Code Call TAP-161 556A Switchboard TAP-162 sn TROUBLE INDICATOR LIST- 756A PBX Issue 1 1 May 1975 551-100-101 TIL PAGE4of4 095 -48 [1] Connect 1014A handset to test line STA 39 operating TALK key, then originate camp-on call from console to a COAL COA LT3 LT2 LT4 LT5 LT6 I ., I 13 3 a,),. STA39 13 3 LT7 LTB LT9 1 1 ., ,, I 3 LEA COAA CO~BA C07AA 10 17 6 LEB COBA 10 17 •• SD-65741 FIG.1 [6] Are camp-on relays [2] See FIG. 1. Are any LT -(2·9) relays (slide 6P) operated (COAA, COBA, CONBA, and CONAA) in state No shown in FIG. i during link testing sequence of marker Yes [3] Is COAL relay (slide lAB) operated Yes Yes [ 5] Check for foreign ground causing COAl relay to operate using cabling diagram SD-65746 and FIG. 1 No [4] See FIG. 2. Check for foreign ground causing COAL lamp (slide 1) to light [7] Check operate path for camp-on relays (slide 6R, S, T) using No }-'-I~ SD-65741, sheet B16 to locate and clear trouble [8] See FIG. 1. Check I , L T -(2·9) relay circuit [9] Depre~ AR key (slide 1) ! operate paths [FIG. 3] to determine why LT relay of seized link did not operate COA.L [10] Depress 1----1 f----------L-~ AR key (slide 1) @ COAL -•aT------''-----5~)((-----,1 ~a SD-65741 FIG.2 Issue 1 CLEAR CAMP-ON ALARM (COAL) TROUBLE I May 1975 551-100-101 TAP Pa!!E! 1 of 2 100 LTCA LTA2 5G8 LTZ CKT LTZ (GP) I (6N) CONBA (G5) L -48 P/0 VROA z ( 6<l) LTA TRLA TRLB (GQ) (GQ) (5D-5E037 ] 5 (GN) LT CKT LT3 LT4 RESISTOR DES I G. LTC(A,B) CONTACTS LT RELAY _LTA3 z LT3 LTA4 LT5 LTA5 LTG LTA6 LT7 LTA7 LT8 LTA8 l 3 4 5 G BA AA 3, BA 3 LT5 AA 4~ SA 4 LTG AA 9 8A 9 LT7 7 CON {AA, BA} LTB VRDCONNECTIONS CONTACTS AA 2. LT4 BAJO AAJ I • BAll oz TRL(A, B) CONTACTS CONTACT z ~ ~ ~ ~ ~ ~ Z AA/0, LT(A, B) 12 2 8 4, All 3 3 B G, AID 4 4 8 7 A9 1 9 A 3, 812 2 10 A 4, 811 3 II A G, 810 LTCA LT9 8 LT9 CKT 12 I l 5 Ql G LTCB LTB 3 LTA9 P/0 VROB CONBA L -48 .G IZ IZ 8 9 Q4 LT8 LTA IZ TRLA TRLB 12 5 19 LTCB [5D-5E037 ] 8 9 s 09 FJG.3 Issue 1 L Ma~ 1975 551-100-101 CLEAR CAMP-ON ALARM (COAL ) TROUB LE Page 2 of 2 --·--_ TAP 100 [1] Is EXT relay operated (slide 1X) No r [2] Check for crossed contacts or foreign battery on EXT lamp lead [FIG. 1) EXT FA @ EXT )( -46 I SD-66796 4- Yes FIG.1 [3] Is alarm lamp on in external cabinet No r [4] Check for grounds in station message register (SMR) or trunk finder circuit. Yes [5] Which alarm lamp is lighted MR RA • [6] Remove relay timer delay circuit fromJ1 [7] Did RA lamp go out (ALM relay released) NV , ~ [8) Check ALM and No os relays for crossed contacts or foreign grounds [SD~5E021] Yes [10] Check 115 Vac input and + 48 Vde output of KS-15620 power supply. Repair or replace as necessary [9] Replace relay timer delay circuit · [SD-993 61] " [11) Locate message register associated with blown MR fuse [12] Isolate short circuit using SD-5E021 (+48 MR- circuit) repair or replace [13] Verify repair by fuse replacem ent CLEAR EXTER NAL (EXT) ALARM TROUB LE I May 1975 Issue 1 551-100-101 TAP PAGE 1 of 1 101 SUMMARY For any blown fuse, TABLE A gives the associated circuit and equipment location. Using this information, repair any defects found on inspection and replace blown fuse. If fuse blows again, trouble must be isolated using the associated schematic drawing listed in TABLE A. See EXAMPLE on page 3. [1] On TABLE A, find designation and circuit associated with blown fuse [2] Find slide and mounting Equipment located [3] plate location(s) of equipment associated with blown fuse See CAUTION. Restore crossed or misaligned wire· spring relay contacts [4] Repair any wiring found pinched between mounting plates CAUTION Avoid service interruptions. Notify attendant(s) trouble alarm lamp at attendant position(s) will be lighted. When aligning movable springs of wire-spring relays, use care not to dislodge the movable spring from the groove ofthecomb [5] Inspect for bare wiring touching mounting plate(s) or adjacent components [6] Inspect wiring side of equipment for any bent terminals touching other terminals or framework [7] Replace blown. fuse with same type fuse Trouble located by inspection cleared Page 3 Issue 1 CLEAR FUSE ALARM (FA) TROUBLE I May 1975 551·10()..101 TAP Page 1 of 4 102 TABLE A LOCATION OF' EQUIPMENT ASSOCIATED WITH BLOWN F'USE AT SLIDE I~ MOUNTING PLATE. Y OR Z {SD-66796-01*) F'USE DESIG CIRCUIT A MARKER ATO ATI AT2 API AP2 ATND TRUNK 0-2 ATND POSJ. 2 LOC OF' ASSOC EQ F'USE SLIDE AND MTG PLT SCHEMATIC DRAWING DESIG GAB 65741-01 FT SY 4N~ 4T. SZ 4T. SAA sv 65757-01 SJ POWER SUPPLY IW. 6$ S0-81326-02 AS so A6 SE 2L. 6T MARKER 65741-0J JTO 3T A9 JTI 3T M MARKER GAB 65741-01 JT2 BUSY TONE 4AA 65754-01 JT3 c coo MARKER 6Z 65741-01 F'USE DESJG J B LOC Of ASSOC EQ SLIDE AND SCHENAT IC DRAW·ING MTG PLT CIRCUIT 2L.- 6S 6R H BT 4T, SB F'USE SCHENAT IC DRAWING G 65753-01 LOC OF' ASSOC EQ SLIDE AND MTG PLT AS' 3U JUNCT6RS o-s 4Y A7 65750-01 " p CIRCUIT ~TA MESS. REG 5-9 t 5E02J-01 DESIG SF LOC Of ASSOC EQ CIRCUIT SLIDE MTG PLT SCHEMATIC DRAWING SWBO t t • MARKER 4AA. GAB SG T IAA, 6AA TO 6z MARKER 6Z 65741-0! lAB Tl 4AA~ TSO 2N JT4 4Y Q JAA.- 6J T81 2N JT5 3U R GAB T82 2N 6C T83 4T, 6C T84 6AA COl 4T, so K 6R RAO C02 4T, SF L IAA. 6AA RBO 4T, SJ 4T, SJ L2 2P, 6Z RCO 6C L3 2L, 6Z RAJ SF T86 3N, Sf T87 2P, 3V T88 2P, 3V C03 C04 cos cos co TRUNKS 0-9 C07 r--cos 1--C09 MARKER F FA FCI FC2 4N, SN L4 4N, SQ LS 4N.- 55 4N, SV 4N, 5V TTA 6Z 0 E 65752-01 6Y POWER SUPPLY 2L, 5J IB IB 66796-01* SD-81326-02 3L, 6Z -3L~ 65741-01 RBI REGISTER I 65742-01 T8S 6Z RCI 6f L6 4L, 6Z T89 4L, 6Z s so 3V. 6Q L7 2f, 4T TR lA Sl 2F, 4T UA lA S23 POWER SUPPLY TTB 65741-01 6X ALARM, TRfR, AND TEST MARKER REGISTER 0 MARKER 2G, 4U 65741-01 UB TIC DIAL CONf.- REC TEL DICT, 3A CODE CALL. MISC~ ETC. 80-89 2N 65741-01 2N 2P, 3V 2P, 3V 2P, 3V TRAffiC REG IW SEOID-01 6V 6V MARKER 65741-01 1 AO S45 2H, 4V X AI 567 2J, 4W y S89 2K, 4X IR INWARD REST t 5Eod3-0I OSS DIRECT STA SEL t 65742-01 z MARKER GT 65741-01 MBO MAKE-BUSY 2AB 5E029-0I A2 STA. MESS. REG 0-4 t 5E021-0I A3 SB sc A4 *REPLACED SD-65743-01 WHICH WAS RATED MD IN MARCH t EXTERNAL *MAY BE 556- OR 608-TYPE SWITCHBOARD DRAWINGS 1962 SWBO t • 6U 6U Issue 1 CLEAR FUSE ALARM (FA) TROUBLE I May 1975 551-100-101 TAP Page 2 of4 102 [8] Does fuse blow again on next call using same equipment component s Yes No [9] Find the battery lead (fuse designation) first in A, then G sheets of cabling diagram (SD-65746-01). Locate point(s) where lead terminates on equipment. See EXAMPLE and FIG.1 [10] On TABLE A, find main schematic drawing number associated with blown fuse Trouble may be considered cleared or transient CAUTION Avoid service interruptions. Notify attendant(s) trouble alarm lamp at attendant position(s) will be lighted. When aligning movable springs of wire-spring relays, use care not to dislodge the movable spring from the groove of the comb ~ [11] See CAUTION. Isolate circuit branches by opening leads, insulating relay contacts, etc., until fault is located and trouble is cleared [12] Reconnect circuit branches and restore to normal all component s disabled for testing [13] Replace blown fuse with same type fuse EXAMPLE If ATO fuse is blown, TABLE A shows that the circuit is attendant trunk 0 and the associated equipment is located both at slide 4, mounting plate N, and at slide 5, mounting plate Y. Sheet A2 of cabling diagram SD-65746-01 shows ATO battery lead is located on sheets G41 and G46, See FIG. 1. Sheet G41 shews the .A-TO battery lead terminates on lower winding terminal of trunk,hold magnet for vertical 0, crossbar switch 8. Sheet G46 shows ATO battery lead also terminates on 1lower (winding terminal) of AC relay. TABLE A identifies SD-65753-01 as the attendant trunk schematic drawing. j May 1975 551-100-101 TAP Page3 of 4 102 Issue 1 CLEAR FUSE ALARM (FA) TROUBLE -....:::__:-- LEAD INDEX DESIG "G" SHEET NUMBERS FROM ATO BAT FUSE PANEL. MA" SHEET NUMBER 2 PBX CABLING DIAGRAM SD-65746-01-A2 -48 ATO BEL.I. TELEPHONE LABORATORIES 65 0 r- 2 SLIDE I SLIDE 2 PLUG J PIN NO. 4 SLIDE 3 PLUG J PeT I PIN NO. I I XBR (NOTE) z s 7 ORAWI'"G ~~ OESIG ~~- BAT. I GRD ~~ PART OF CAD 2 N ATO 0 THM )> ::----4 2 PLUG F PIN NO. SLIDE 2 PLT PLUG F PIN NO. 7 s 9 6 7 s 9 SLIDE 6 LEAD DESIG 6 PLUG F PIN NO. 4 (NOTE) I SLIDE 4 PLT SLIDE !51 PLUG F PIN NO. PLT I PLUG F PIN NO. I - s ~. (ATO TO BAT.FP 4 SLIDE '3 PLT SD-65746-0I-G41 Bf:l.L. TELEPHONE LABORATORIES j GS 2 0 ~~- ~I!! f---1--- FOR 7~6A PBX NO. 756A PBX CABLING DIAGRAM NOTE: ATO LEAD IS CONNECTED TO ATO FUSE SLIDE 1 ~~- RINGING BATTERY AND GROUND LEADS ~ 0 9 LEAD c ~SWB VERT 6 SLIDE 6 PLT OK 6 6 SL.IOE ~ ~. ATO TO FP F=-BAT. 5 SLIDE 4: PLT PLUG F PIN NO. PLT BAT. GRD ~AC ~~ ~T.A. PART OF CAD 2 ~GING BATTERY ANO GROUNO LEAOS I I z ~~~ I .1----.., ~ CI!4WI .. G ~ut f-:!:. ...... FOR 756A PBX v 4 ~~ ~I§ ~t* .___ ATO ~® ~~ 3t10 T.K. ~ PBX CABLING DIAGRAM SD-65746·01-G46 SELL TELEPHONE LASORATORIESr 65 0 2 4 5 FIG.1 CLEAR FUSE ALARM (FA) TROUBLE 6 7 s 9 Issue 1 T May 1975 551-100-101 TAP Page4 of4 102 JR AL Q -48 [1] Originate a station-tostation call to test line STA 39 using handset 1014A or equivalent. [TAD-163 and NOTE 1] L JREA JTAA II 4 JREB JTBA II 4 u 2500 JR3 JR2 JRl JRO 8 8 8 8 8 6 SEAA 8 SEBA II JRAL -~ AL so- 66796 No JR-(0-5) at slide 6X operated [FIG. 1] [3] Check operate path of JR relays and clear trouble using SD-657 41, sheet B13 Yes No [5] See FIG. 2. Check for shorted or crossed contacts in JR relays causing JREA and JREB relays not to operate [NOTE 2] SD-65741-929 JA --4 AL M CKT [ 4] Are JREA or JREB relays (slide 6X, Y) operated JR4 4 ---- [2] Is any relay JR5 I I I I FIG.1 NOTES 1. This is a junctor class call and will exercise the junctor relays and circuit and indicate the JRAL alarm condition 2. JREA and JREB relays should operate only when one of relays JR-(0·5) operate c Yes JR-(0-5) -48 )( 0-"o<' )( JREA JR-(0-5) '-..L. ll 700 2 1 ~c ( Page 2 ) JREB [6] Depress AR key (slide 1) D -48 JR-(0-5) Lou JR-(0-5) )( ......... .....)( 10 3 SD-65741 :;\. 0 FIG.2 Issue 1 CLEAR JUNCTOR REGISTER ALARM (JRAL) TROUBLE --·~-. I Mav 1975 551-100·101 TAP Page 1 of 2 103 JRAL [7] Are relays JTAA (slide fi Yl or JTBA (6X) andSEAA ( 6V) or SEBA ( 6U) operated No [8] Check for foreign ground causing J RA L relay (slide lAA) to operate [FIG. 1] I -48 @ JRAL )( 10 SD-65741 1 ~Q FIG.3 Yes [9] Check for closed make contact on JREA and JREB relays or wiring condition (wire clipping, cross spring, etc) causing JRAL relay to operate. See FIG. 1 [10) Is JRAL relay (slide 1AA) operated No [11] Check for foreign ground causingJRAL lamp (slide 1) to light using FIG. 3 Yes [12] Check for foreign ground causing JRAL relay to operate [FIG. 1) [13] Depress AR key Issue 1 \ May 1975 551·10().101 TAP CLEAR JUNCTOR REGISTER ALARM (JRAL) TROUBLE Page 2 of 2 103 TABLE A [1] Connect test handset to test line Station 39 and originate station-tostation, trunk-to-station, or trunk-to-trunk (use camp-on condition) NOTEl If both relays in a pair are not operated or released at the same time, LAL 1 relay will operate [2] See TABLE A. Check for operation of relay pairs [NOTEl] [ 3] Did each relay pair operate or release together RELA v PAIR CONTACTS TO INSULATE SLIDE NUMBER LTAA/LTBA COA/CO:B CONA/CONB CONA/CONAA CONB/CO NBA CO SA/COSB LEAA/LEBA LEA/LE AA LEB/LEBA TRLA/T RLB WIL/WILA WL/WLA 7M, B/7M, B 4M,B/4M,B SM,B/SM, B 6M, B/6 & 7M, B 6M,B/6 & 7M, B 1M, B/lM, B 9M, B/9M,B 6M,B/6M,B 6M,B/6M,B 5M, B/5M,B 10M, B/12M, B SM, B/lM, B 6Q 6T/6S 6T/6S 6T 6S 6P 6Q 6Q 6Q 6Q 6L/6M 6L/6M [ 4] Determine relay pair out of sequence. 1----+1 [5] Depress >-'""'----+! Locate and clear AR key 1----11 trouble [TABLE A] (slide l) SD-65741 SHEET NUMBER B40 Bl6 B16 Bl6 B16 B40 B38 B38 B38 B40 B24/32 B24/32 No LALl LCKJ -48 _ ____, 1-..----~~--;;,2*"--, Yes LCK2 3 LALI [6] See FIG. 1. Check for operation of LCK1 or LCK2 relay (slide 6P) causing LA L 1 relay to operate ,-1 _( Page2 3 I ALM CKT I ) I I -, AL S0-66796 S0-6574\ I I I \ FIG.1 Issue 1 I Mav 1975 551-100·101 TAP PAGE 1 of 3 CLEAR LINK TEST ALARM {LAL1) TROUBLE - ·~-. 104 [7] Did LCK1 or LCK2 relay operate Yes [ 8] Check for foreign grounds on leads SM0-9 (SD-65741, sheets B24 and 28) and clear trouble (12] Depress AR key No [9] Check operation of WLG and WLGA relays (slide 6M) NOTE2 The operation of WLG and WLGA relays together will cause LAL 1 relay to operate [FIG. 3] [10] Do WLG and WLGA relays operate together [NOTE 2] [ 11] Check operate path for WLG and WLGA relays [FIG. 2] to clear trouble Yes WLGA 8_ +- WLG No -48 ( Page3 ZLG LBB LBA LTAA 5 5 2 -48 7 7 WL GA 1 LBB ~ COAA LBA zl 13 2 COBA ) WLGA ~ LTBA ~ 13 zLG ~ WLGA -48 ---"V'Jv--- --1*---+--- -' 5 SD-65741 FIG. 2 Issue 1 CLEAR LINK TEST ALARM {LAL 1) TROUBLE I Ma\ 1975 551-100-101 TAP PAGE 2 of 3 104 LALI WLGA WLG - 4 8 - - - - 1---....------l~--~-8 LALI [13] Is LAL1 relay (slide 1AA) operated No [14] See FIG. 4. Check for foreign ground causing LAL1 lamp to light and clear trouble SD-65741 -------3 -~ AL ALM CKT = I j I SD-66796 Yes FIG.3 [15] See FIG. 3. Check for foreign ground causing LAL1 relay to operate and clear trouble ' LALI -48 @ LALI 4 SD-65741 )( J FIG.4 [16] Depress AR key I Ma 1975 551·100.10 1 TAP PAGE 3 of3 104 Issue 1 CLEAR LINK TEST ALARM (LAL 1) TROUBL E LAL2 LBB [1] Connect 1014A handset to test line STA 39 and originate station-to-stat ion calls [TAD-163] LBA -48 8 NOTE If both relays in a pair are not operated or released at the same time, LAL2 and LAL2A relays will operate LAL2 ALBB ALBA 8 8 SMTB SMTA 8 8 3 I..AL2A LAL2A -48 3 [2] See FIG. 1. Check for operation of relay pairs LBA, B; ALBA, B; and SMTA. B (slides 6P and 6Q) [NOTE] r I I I I I ---, S0-65741 -~ AL ALM CKT SD-66796 I I 823,840 TO LINK SEQUENCE '--------CONT ROL ClRCU IT . {S0-65741,632} l I FIG.1 [3] Did relay pairs LBA, B; ALBA, B; andSMTA, B operate together No [4] See FIG. 1. Determine relay pair out of sequence and clear trouble condition [5] Depress ARkey Yes ( Page 2 ) Issue 1 CLEAR LINK TEST ALARM (LAL2) TROUBLE -- I May 1975 551-100-101 TAP Page 1 of 2 105 ----------------- [6] Check operation of relays in link sequence control circuit using SD-65741, sheet B32,by insulating relay contacts until trouble is located (TAD-163] LAL2 -48 @ LAL2A )( 01- 4 so -6574( Fl G. 2 [7] Did link sequence control circuit operate without trouble No [ 8] Determine trouble condition by exercising marker and link circuits, isolating relays as indicated in step 2, and clear trouble Yes [9] Are LAL2 and LAL2A relays operated No [10] See FIG. 2. Check for foreign ground causing LAL2 lamp to light and clear trouble Yes [11] See FIG. 1. Check for foreign ground causing LAL2 1 - - - - - - - - - - - - L - - - - - - - - - - . . . L - - - . . 1 [12] Depress and LAL2A relays AR key ~---1 to operate (slide 1) and clear trouble Issue 1 CLEAR LINK TEST ALARM (LAL2) TROUBLE I Mav 1975 551-100-101 TAP Page 2 of 2 105 MAL TA8LEA [1] Using 1014A handset, originate station-tostation calls to test line STA 39 [TAD-163] [2] See FtG. 1. Check for operation of relay pairs LUCA, 8 (slide 6V, U); 8TCA, 8 (6T, S); HMKA, 8 (6V, U); and LTA, 8 (6Q) [NOTE] [3] Does each relay pair operate at same time RELAY LUCA LUCB NOTE If both relays in a pair are not operated or released at the same time, MAL relay will operate SD-65741 SLIDE SHEET NO. LOC. B8A B8A 6V 6U BTCA BTCB 815 815 6T 6S HMKA HMKB 89 89 6V 6U LTA LTB 822 822 6Q 6Q LUCB . . TucA -48 '•t f 6 MAL BTCA BTCB ---- 2 -~ AL ALM CKT = SD-66796 I t· RA LEAD I I I I 'a _ ~MK HMKB '• t" I LTB f A _l LTA 'r SD-65741 FIG.1 Yes [6] Is MAL relay (slide lAB) operated Yes [8] See FIG.l. Check for foreign ground causing MAL relay to operate MAL -48 @ MAL 4 )( SD-65741 No FIG.2 No lr [ 4] Check circuit of relay pair (slide 6) not operating using associated B sheet of SD-65741 [TABLE A] [5] Depress AR key [7] Check for foreign ground causing MAL lamp to light [FIG. 2] [9] Depress AR key (slide 1) to release all alarms ' May 1975 551-100-101 TAP PAGE 1 of 1 106 Issue 1 CLEAR MISCELLANE OUS ALARM (MAL) TROUBLE (1] At slide 1X, check for operaton of RB and S relays [2] Which relays are operated s [3] Check relays for shorted contact or foreign battery operating PA lamp [FIG. 1] Neither RB PA FA RB FA •:s: --48 -·· 2 @ I 1 . "=FA S0-66796 FIG.1 [10] Which fuse at slide 1E is blown [4] Did RB1 fuse blow (slide 1 Y) ±10V INT Yes No [5] Check RB alarm lead from fuse panel (TS2, term 9) to RB relay for foreign battery [SD-81577] . (11] Check ±10 Vac lead to attendant console for foreign ground [SD-66796] [12] Check interrupter motor and circuit for short or foreign ground [SD-81577] - [13] Correct trouble and replace fuse [6] Check KS-15984 interrupter cam and contacts, V1 and associated components, and 107D frequency generator for grounds [SD-81577] [7] Was trouble source found and corrected Yes [8] Replace RB1 fuse No [9] Check for foreign grounds ' - - on R1lead from J1 pin 21 [SD-65746, G113] CLEAR POWER ALARM (PA) TROUBLE (SD-66796) l May 1975 551-100-101 TAP PAGE 1 of 1 107 Issue 1 RLAL -48 NOTE [1] Originate station-tostation calls using 1014A handset or equivalent L If both relays in a pair are u ALBA ALBB RLSAA 9 9 7 RLSA s 3 not operated or released at the same time, the RLAL relay will operate [TAD-163] RLAL ------ ---.., I I I I I 2 AL ALM CKT [2] See FIG. 1. Check for operation of relay pairs: R LSA, AA (slide 6K); RLSB, BA (6J); RLSB RLSBA RA LEAD 7 s RLB RLA B I I SD-66796 RLSA RLSB 7 7 RLA, B (6T, S); RLSA, B (6K, J); and TSDA, B (6R) TSCA TSDB [NOTE] SD-65741-930 [3] Does each relay pair operate or release together No [ 5] Determine relay pair out of sequence and clear trouble using SD-657 41, sheet B15, B18, B25A, F6, F7, or FlO FIG.1 r Page3 ) Yes [4] See FIG. 2. Check for operation of relays R LA, RLAA, and RLAB at same time (slide 6T) RLAA RLA s s •• B B RLAB ----2 -..., LEAD AL Page 2 ) '"------ -" ALM CKT RLAB I I RLAA S0-65741-930 j SD-66796 FIG. 2 Issue 1 CLEAR RELEASE ALARM (RLAL) TROUBLE - _.- I May 1975 551-100-101 TAP Page 1 of 3 108 RLAL -48 [6] Did RLA, RLAA, and R LAB relays operate together No L ALBB AL~A '• '• u ,RLB - 8 B 6, ' • •• RLAL RA LEAD -~ 2 Yes AL I I ALM-CKT SD-66796 I ~ RLBB RLBA SD-65741-830 I [7] See FIG. 3. Check for operation of RLB, RLBB, and .RLBA relays at same time (slide 68) and R LBA relays operate together RLBA 3 ------ [8] Did RLB, RLBB, RLBB FIG.3 No [9] Determine relay out of sequence and clear trouble using SD-65741, sheet B15 [10] Depress AR key Yes ( Page 3 ) Issue 1 CLEAR RELEASE ALARM (RLAL) TROUBLE I May 1975 551-100-101 TAP Page 2 of 3 108 RLAL [11] Is RLAL relay (slide 1AA) operated No [12] SeeFIG.4. Check for foreign ground causing RLAL lamp to light. -48 @ RLAL 4 )( S0-65741-633 FIG.4 Yes [13] See FIG. 1, 2, or 3. Check for foreign ground causing RLAL relay to operate , [14] Depress ARkey . Issue 1 I Mav 1975 551·100·101 TAP CLEAR RELEASE ALARM (RLAL) TROUBLE Page 3 of 3 108 NOTES [1] Connect handset (1014A or equivale nt) to test line STA 39 and originate station-t o-station or station-t o-trunk calls to locate trouble (NOTE 1] [TAD-16 3] 1. TRAL alarm lamp checks marker complet ion of dial tone connect ion by operatio n of TA- or TRA- relays. If one of these relays does not operate, TRAL lamp lights 2. TA- relays are associate d with tens group originati ng call (exampl e: STA 39-TA3 relay). Each tens group should be tested until tens group indicatin g trouble is located (2] See FIG.l. Check for operation of TA3 relay (slide 6AB) (3] Did TA3 relay operate [NOTE 2] Yes (4] Check circuit of TA- or TRA- relay to determin e why relay did not operate [SD-657 41, sheet B2] No [5] Did TRAL relay operate No [7] See FIG. 2. Check for foreign ground causing TRAL lamp to light Yes 6AB TRAL -48 ° L TRA~, 1 u 6~~ 4 TA~-5 1AA TRAL si~ TA~,7 ---- -·6 -~ AL ALM CKT = 50-66796 I I I 7' 6Z TRPO, I I 6AB,AA TRO, I 8 6Z TP2-5 8 :I II 6AA T2-5 6Z TP6, 7 II 6AA T6,7 8 II 6T 2 65 RLBB 2 I I I I I I S0-65741-9 31 I 6K RLSAA 3 6J RLSBA 3 S0-65741-8 2 I FIG.1 TRAL (6] See FIG. 1. Check for foreign ground causing TRAL relay to operate when TRAor TA- relay is operated (slide 1AA) ' -48 T (jjl TRAL )( 6 "'!, S0-65741 Q FIG. 2 ..... [8] Depress AR key to release all alarms Issue 1 CLEAR TENS RELEAS E ALARM (TRAL) TROUB LE RLAB I A L EAD I May 1975 551-100·101 TAP Page 1 of 1 109 = = = = TABLE A [1] Connect 1014A handset to test line STA 39 and originate station-to-station or station-to-trunk calls [TAD-163] NOTE If both relays in a pair are not operated or released at the same time, TAL relay will operate [2] See TABLE A. Check for operation of reiay pairs [NOTE] [ 3] Did each relay pair operate or release together No [ 4] Determine relay pair out of sequence and clear trouble [TABLE A] Yes Page 2 ) [ 5] Adjust or replace faulty relay. Depress AR key (slide 1) 1-------- RELAY PAIR CONTACTS TO INSULATE TU2/TCS2 TU3/TCS3 TU4/TCS4 TU5/TCS5 TU6/TCS6 TU7/TCS7 RCCl/RCDl RCAl/RCBl RCAl/RCCl TACAA/TACBA RCAO/RCBO· RCAO/RCCO RCDO/RCEO RCCO/RCDO RCDl/RCEl ARBA/ARBB TKO/TKAO TK9/TKA9 TK8/TKA8 TRCl/TRUl TRCO/TRUO TU2/THC2 TU3/THC3 TU4/THC4 TU5/THC5 TU6/THC6 TU7/THC7 TCK1;3 TCK2,4 8M,B/6M,B SM, B/6M,B SM, B/6M,B SM, B/6M,B SM, B/6M,B SM, B/6M,B SM, B/6M,B 6M, B/4M, B 8M,B/6M,B SM, B/8¥, B 6M,B/4M,B SM, B/GM, B 8M,B/6M,B 8M;B/6M, B 8M,B/6M, B 8M,B/6M, B 6M,B/6M, B 6M,B/6M,B 6M, B/6M, B SM,B/SM,B 8M,B/8M,B 6M, B/8M,B 6M, B/8M,B 6M, B/8M, B 6M,B/8M,B 6M, B/8M,B 6M, B/8M,B llM,B/lM, B 1M, B/llM,B SLIDE LOCATION S0-65741 SHEET NUMBER 2M B4 2M 4M 4M 6H 6H 6H 6Y 6H 6H 6H 6H 6H 6AB/6AA 4Z 4Z 2L 4Z 4Z 2M 2M 3M 3M 4M 4M B4 B5A B5A B5A B4 B5A ! B5A B2 B5A B5B B5B B4 B4 B3 B3 6Z 6Z Issue 1 CLEAR TENS ALARM {TAl) TROUBLE I 3M 3M I May 1975 551-100-101 TAP Page 1 of 4 110 (6] See FIG. 1. Check for operation of relays RPO, 1 (slide 6Z); TRPO, 1 (6Z); TP_(2-5) (6AA); or TP6, 7 (6AA) at same time relay R LAA ( 6T) or R LBA (6S) is operated TOKB TOKA '7 '7 TAL RPO, I ~ I TAL -48 9 SD-65741 TRPO, I 3 12 7 TP2-5 r - - - - ----, I I I I I I I I ' AL I I I AL M CKT ! 9 7 TP6, 7 7 SD-65741 I I SD-6 6796 FIG.1 [7] Did relay R PO or 1; TRPO or 1; TP__{2-5); or TP6, 7 operate while relay RLAA or RLBA was operated [8] See FIG. 1. Determine relay circuit causing trouble and clear trouble Yes (9] Depress AR key No -48 [10] See FIG. 2. Check for release of relays TEAO, 1, 2, 3 (slide 6AB) or TEBO, 1, 2, 3 (6AA) at same time one of relays TA2·5; TAG, 7; TRAO, 1; or RO, 1 is operated T0 KB 1 7' TEA0-2 TEB0-2 TAL T0 KA 1 7' 4 ~ TAL TA6, 7 3 -48 9 "\. Page3 ) TA2-5 SD-65741 r----:- ---l 9 AL I I 4 TEA3 TE83 ~ TRAO, I 4 I I I I ~ RO, I I ~ ALM CKT so - 66796 9 I ~ S0-65741 I I FIG. 2 Issue 1 CLEAR TENS ALARM (TAL) TROUBLE I May 1975 551-100·101 TAP Page 2 of 4 110 [11] Were any TEA or TEB relays released during step 10 Yes [12] Determine cause for TEA0-3 or TEB0..3 relay being released using SD-65741, sheets B2 and B30 and clear trouble [13] Depress AR key [16] Determine cause for operation of more than one TRM_or ™relay using SD-65 7 41 sheets B4 and B31 and clear trouble [17] Depress AR key No [14] Check for operation of (more than one) relays TRM0-1 (slide 4Z) or TM2-7 (slide 2, 3, 4M) when one of relays TRO, 1 (6A.A,) or T2-7 (6AA) is operated [15] Did relays TRMO, 1 or TM2-7 operate when one of relays RO, 1 or T2-7 is operated Yes No [18] Check for operation of more than one of relays TKBS (2L), 0, 9 (4Z) and TM2-7 (2, 3, 4M) when RCEO and 1 ( 6H) are operated J "\ Page4 ) Issue 1 CLEAR TENS ALARM (TAL) TROUBLE 551-100..101 Page 3 of4 May 1975 TAP 110 [19] Did relays TRMO, 1 or TKB8, 9, 0 operate when RCEO or 1 was operated Yes .... [20] Determine cause for operation of more than one TRM and TKB relay usmg SD-65741 sheets B4, B5A, B, and B31 and clear trouble ...... [23] See FIG. 3; Check for foreign ground causing TAL lamp to light [21] Depress ~ AR key No [22] Is TAL relay operated (slide lAA) No Yes ' [24] Check for foreign ground causing TAL relay to operate [SD657 41, sheet B31] , [25] Depress AR key . TAL -48 @ TAL 4)( 001SD-65741 FIG.3 Issue 1 CLEAR TENS ALARM (TAL) TROUBLE I Ma 1975 551-100·101 TAP Page 4 of 4 110 I SLIDE I TS [1] Originate station-totrunk call using 1014A handset or equivalent. [NOTE] NOTE This is trunk (CO or RDTT) class call and will detect trouble on leads TT, TLA, RS, BY, and FF. I @ II TS LEAD T -48 S0-65741 I S0-65746 I I I I I SLIDE 6 TS )( 10 S0-65741 "'1- FJG.1 , [2] Check for operation of TS relay (slide 6R) [3] Did TS relay operate (slide 6R) No [4] See FIG.1. Check for foreign ground on TS lead (lamp circuit) No [6] Check TS relay circuit ISP-65741," sheet B19] for foreign ground causing TS relay to operate Yes [5] Are TSDA and TSDB relays released (slide 6R) in their normal state Yes , [7] Check for foreign ground on leads TT TLA, RS, BY, and FF from central office and ringdown tie trunks causing TS relay to operate [SD-65741, sheet B19 and SD-65752] [8] Clear trouble condition and depress AR key (slide 1) Issue 1 CLEAR TEST ALARM (TS) TROUBLE I May 1975 · 551-10Q-101 TAP Page 1 of 1 111 [1] Connect 1014A handset to test line STA 39 and originate station-to-station calls to check operation of TOAL and TOALA relays (slide 1AA) [TAD-163] TOAL (nj T TOALA _]4+1'----~)c;----, .:___ -48 4 "'1- SD-65741 0 FIG.1 [2] Are both TOAL and TOALA relays operated No Yes [5] See FIG. 2. Check relay pairs MTA (slide 6K), MTB (6J); NAA (6K), NAB (6J); STA (6K), STB (6J); and TOLA (6K), TO LB ( 6J) for operation or release together [NOTE] I \. Page2 TOAL --48 [3] See FIG. L Check for foreign ground causing TOAL lamp to light (slide 1) ) 0 L U ~f,o~o~o------1----r~----~~--~~-, NOTE If both relays in a pair are not operated T OAL.A L ~ TOAL f'u'-----1>---*:--; 1000 or released at the same time, TOAL relay will operate 3 TO ALA -, OA [4] Depress AR key (slide 1) to release alarm I I I ALM CKT I L SD-667~ _j I I I I a AL Issue 1 CLEAR TIME-OUT ALARM (TOAL) TROUBLE I May 1975 551-100-101 TAP Page 1 of 2 112 [6] See FIG. 2. Did the relay pairs operate or release together No [ 7] Using pages B2 5A and B26, SD-657 41, check for trouble causing relay pair to malfunction [NOTE] Yes [8] Check for foreign ground causing TOAL relay to operate using SD-65741 and FIG. 2 [9] Clear trouble condition and test time-out feature again [step 1] [10] Depress AR key (slide 1) to release alarm Issue 1 CLEAR TIME-OUT ALARM (TOAL) TROUBLE I May 1975 551·10()..101 TAP Page 2 of 2 112 [1] Connect 1014A handset to test line STA 39 and originate station-to-stat ion calls [2] See FIG. 1. Check for operation of TRA and TRB relays (slide 6K and 6J) --< [4] See FIG.1. Check for operation of RLSAA and RLSBA relays (slide 6K and 6J) Yes [3] llid m and TRB relays operate ~5] llidoroifu~? RLSAA R LSBA relay operate No -48 T0KB 1 T~KA '7 '7 .. ,· TAAL TAAL '•t -46 SD-65741 No TRA TRS T 12 TAAL --.., r------I 2 I AL I I ~ I I I ALM CKT SD-66796 •. RLSAA Z' .,),. RLSBA 2 SD-65741 .,),. I I I I I I I • FJG.1 [7] Is TAAL relay (slide 1AA) operated Yes [8] See FIG.1. Clear foreign ground causing TAA L relay to operate TAAL -46 @ .--- TAAL 2 ~E ::),. SD-65741 No [6] Clear trouble causing relays TRA, B and RLSAA or R LSBA to operate using SD-657 41-01, sheet B25A. FIG. 2 [9] See FIG. 2. Clear foreign ground causing TAALlampto light • I. ~ [10] Depress AR key Issue 1 CLEAR TROUBLE ADVANCE ALARM (TAAL) TROUBLE I Mav 1975 551-100·101 TAP Page 1·of 1 113 TABL EA NOTES [1] Connect test handset to test line STA 39 and originate station-tostation calls [NOTE 1] 1. Refer to TAD-163 for general procedure of isolating and clearing troubles indicated by marker alarm lamps 2. If both relays in a pair are not operated or released at the same time, UAL relay will operate ~ [2] See TABLE A. Check for operation of relay pairs [NOTE 2] [ 3] Did each relay pair operate or release together No [ 4] Determine relay pair out of sequence and locate and clear trouble [TAD-163] ~ RELAY PAIR CONTACTS TO INSULATE SLIDE NUMBER UEA/UEB JREA/JREB ULA/ULB RUCA/RUCB SEAA/SEBA HCA/HCB TRKA/TRKA A TRKB/TRKBA TRKA/TRKB WU/WUA 4M,B/ 4M,B 8M, B/8M,B 8M, B/8M,B 8M, B/8M,B 9M, B/9M,B 8M, B/8M,B 6M, B/6M,B 6M,B/6M,B 8M, B/8M,B 4M, B/1 2M,B 6V/U 6Y/X 6V/U 6V/U 6V/U 6Y 6Y 6X 6Y/X 6L/M $0-65741 SHEET NUMBER B8 B13 B8 B8 B12 B9 B14 B14 B14 B12,29 [5] Depress AR key Yes ( Page2 ) Issue 1 I May 1975 551-100·101 TAP CLEAR UNITS ALARM (UAL) TROUBLE Page 1 of 3 114 [6] Check that relays TRCA. AA (slide 6Y) and TRCB, BA (6X) all operate together [FIG. 1] [ 7] Did relays TRCA,AA and No TRCB, BA all operate together [8] See FIG. 1. Determine relay causing trouble and clear trouble in circuit - Yes ~ I I [9] Check operation of JR- (0-5) relays (slide 6X) ' t [10] Did more than one JR- relay operate at same time UAL -48 L UAL u TRCB LEAD TRCA • ' 6 LEAD -~ AL - ALM CKT SD-66796 r UAL UA ----- I~ I II [12] Depress AR key No .L 12' Yes [11] Determine JR- relay causing the trouble and clear trouble using SD-65741, sheets B13 and B29 "" ( Page3 ) 6 TRCAA TRCBA SD-65741 J FIG. 1 Issue 1 CLEAR UNITS ALARM (UAL) TROUBLE _i M~1975 551·1 00-101 TAP Page 2 of 3 114 -~--------------------------=--------------~ NOTE3 WU and WUA relays will be operated or released as a pair if unit sequenc e control circuit is function ing properly [13] Check unit sequence control WU and WUA relays (slide 6L, M) [NOTE 3] UAL L -48 u UAL LEAD 3 UAL S0-65741 ---- --- --., I I I I I AL -~ . ALM CKT WUA relays both operate and release together No r [15] See FIG. 2. Determi ne relay (WU or WUA) causing trouble and locate trouble SD-66796 FIG. 2 UAL Yes -48 @ UA L )( 4 S0-65741 (16] Is UAL relay operated , (slide 1AA) wu UA LEAD I (14] DidWU and WUA No [17] See FIG. 3. Check for foreign ground causing UAL lamp to light "! FIG. 3 Yes [18] Check for foreign ground causing UAL relay to operate [FIG. 2] 1----------lL.--------lL---~ [19] Depress I - - - - - I AR key Issue 1 Ma 1975 551·100·101 TAP CLEAR UNITS ALARM (UAL) TROUB LE Pa e3 of3 .- ·------·-· - - - - - - - 114 TABLE A [1] Connect test RELAY handset to test line STA 39 and originate station-to-station calls PAIRS NOTE If both relays in a pair are not operated or released at the same time, UAL1 and UAL2 relays will operate CONTACTS TO SD-65741 SLID E NUMB ER SHEET INSULATE ACA/ACB 8M,B/8M,B BSYA/BSYB 6M,B/6M,B BSY AA/BSYBA SM, B/SM,B BYA/BYB 3M,B/3M,B HMTA/HMTB 6M,B/6M,B HMTAA/HMTBA 8M,B/8M,B NUMBER .6V/U 6V/U 6V/U 6V/U 6T/ S 6T/S BS Bl2 B12 B12 B15 B15 [2] See TABLE A. Check for operation of relay pairs [NOTE] [ 3] Did each relay pair operate or release together No [ 4] Determine relay pair out of sequence and clear trouble [TABLE A] [5] Depress AR key Yes ( Page 2 ) T Issue 1 May 1975 551-100-101 TAP CLEAR UNITS ALARM (UAL 1) TROUBLE Page 1 of 3 115 [6] Did unit sequence WU and ZU relays (slide 6L, M) operate or release together [FIG. 1] [7] Check operate path of wu and zu relays to clear trouble using SD-65741, sheet B12 No r-----~W-U~~~-TA~C~A-A+------.--+4~STS a UALI -49 L Yes -49 zu 10 L ----[9] Check operate path of TACA, TACB, TACAA, and TACBA relays to clear trouble using SD-657 41 SD-65741 UALIA UL LEAD ---, I I I ALM CKT AL I s 0-66796 I FIG.1 -48 [10] Did STB and SAB relays (slide 6J) operate together [11] Check operate path No MT9 T9 TB MTB 10 4 5 3 of STB and SAB relays to clear trouble [FIG. 2] Yes MT9 TB STB -49 9 Page3 3 TACB u Yes ( TACA 3 UALI 3 No wu 3 UALIA [8] Did TACA, TACB, TACAA, and TACBA relays (slide 6Y) all operate together [FIG.1] 5 u 1 2 II SAB 12 L u SAB 6 STB SAB TB MTB 3 4 ~ SD-65741 ) FIG. 2 [ 12] Depress AR key ' Issue 1 CLEAR UNITS ALARM {UAL 1) TROUBLE --·· ·--- ···-···--- - - - - - - - - - I May 1975 551-100·101 TAP Page 2 of3 115 UALI [13] Are UAL1 and UAL 1A relays operated No [14] See FIG. 3. Clear foreign ground causing UAL 1 lamp to light -48 @ UALJA 4 ~~ SD-65741 FIG.3 Yes [15] Clear foreign ground causing UAL 1 and UAL 1A relays to operate using FIG. 1. ~ [16] DepressAR key . Issue 1 I May 1975 551-100·101 TAP CLEAR UNITS ALARM (UAL 1) TROUBLE Page 3 of 3 115 TABLE A [ 1] Connect test handset to test line (Station 39) and originate station-tostation and trunk-tostation calls RELAY PAIR NOTE If both relays in a pair are not operated or released at the same time UAL2 relay will operate and light UAL2 lamp [2] See TABLE A. Check for operation of relay pairs [NOTE] [ 3] Did each relay pair operate or release together No [ 4] Determine relay pair out of sequence and clear trouble [TABLE A] RGA/RGB RGA/RGAA RGB/RGBA JTAA/JTBA RCTAA/RCTBA BTTA/BTTB ICTA/ICTB RAOA/RAOB RA1A/RA1B COTA/COTB CONTACTS TO INSULATE SLIDE NUMBER SD·65741 SHEET NUMBER 8M,B/8M, B 6M, B/6M, B 6M, B/6M, B SM, B/SM, B 2M,B/2M, B 6M, B/6M, B 11M, B/llM, B 3M, B/2M, 7B 3M,B/2M, 7B 6M, B/6M, B 6G 6G 6G 6Y/X 6V/U 6T/S 6T/S 6G 6G 6T/S B17 B17 B17 B14 B14 B16 B16 B17 B17 B15 [15] Depress r-------------~ARkey ~--------~ Yes ( Page2 ) Issue 1 CLEAR UNITS ALARM (UAL2) TROUBLE I Ma' 1975 551·100-101 TAP ··Page 1 of2 116 UAL2 -48 [ 6] Check select magnet register SMRA, s and SMRAA, BA relays (slide 6T, S) to determine if the pairs operate together L UAL2 • ~ UAL2 -----, S0-66796 No [8] See FIG. 1. Determine select magnet register relay causing trouble and clear trouble -1-. ~A LEAD -~ AL ' • SMRB I SMRBA S0-65741 I I l FIG.1 Yes UAL2 -48 [9] Is UAL2 relay operated (slide 1AA) SMRA - • 3 ALM CI(T [7] Did SMRA, Band SMRAA, BA relays operate together SMRAA LEAD u No ~ @ UAL2 )( 4 [10] See FIG. 2 Clear foreign ground causing UAL2lamp to light OJ,. SD-65741 FIG. 2 Yes [11] Clear foreign ground , _ _ _ _ _ _ __y__ _ _ _ _ _ _ _ _i_1_ _ _ _ causing UAL2 relay to operate using FIG. 1 _J [12] Depress t - - - - - 1 AR key I Mav 1975 Issue 1 551-100-101 TAP CLEAR UNITS ALARM (UAL2) TROUBLE Page 2 of 2 116 XCAL -48 XCAL XC 0 [1] Connect 1014A handset to test line STA 39 operating TALK key, then originate camp-on call from console to STA 39 ~ 8 -48 0 1 XCAL LAI I 12 I SD-65741 I S0-66796 XCAL )( "!,. S0-65741 0 I AL 12 @ 8 ALMCKT- 1 - 7 J. I - FIG. 2 I L-----_j FJG.1 [2] Does XC relay (slide 6P) operate while making