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AT&T 4 ESS, Manual

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AT&T 4 ESS Manual Download Page 270

[14] Is oscillator 

same as noted 

4ESAC for 
assistance

Yes

No

No

in Step 11

[15] Reconnect

adjustment unit

[17] Call 

oscillator
manual

[16] Set thumbwheels
to reading recorded
in Step 12, enter
into oscillator by
depressing 

LOAD

pushbutton and repeat
from Step 13

AND

ALIGN DISCIPLINED RUBIDIUM OSCILLATOR USING OPEN LOOP METHOD

hex display 

[13] Disconnect oscillator manual 
     adjustment unit from oscillator 

[12] Record thumbwheel reading

[11] Record hex display on front

     adjustment unit

     at oscillator manual 

     of oscillator

 [DLP-532] 

     [DLP-531] 

DLP

234-151-013

Issue 8

DEC 1995

543

 PAGE 2 of 2

Summary of Contents for 4 ESS

Page 1: ...TM ESS TOP Comments Hot Line Monday through Friday 8 00 a m 4 00 p m Eastern Time Call 1 800 334 0404 Or FAX to 1 910 727 3043 NETWORK CLOCK FRAME NETWORK CLOCK AND SYSTEM CLOCK SWITCHING NETWORK 4 T...

Page 2: ...l Government Fax 1 317 322 6484 d All Others Call 1 800 432 6600 Developed by orders must be faxed to the AT T Customer Information Center using the following number For permission to reproduce or dis...

Page 3: ...List TAP 104 Diagnostic Failure SCLK Clear Using TLP Suspect Pack List TAP 103 DS1 Sync Reference Signal Check DLP 550 Blown Fuse Not A1 A9 or B1 B8 24 48 and 140 Volt Distribution Clear TAP 122 Circu...

Page 4: ...ut of Service OSC OS Lamp Test DLP 517 Phase Error Clear 39B Oscillator TAP 134 Power 0Ring Diodes FB211 Circuit Pack Check NTP 003 Repetitive Range Exceeded Message NCSU Clear 38B Oscillator TAP 140...

Page 5: ...Abort Diagnostic Failure Clear TAP 110 TLP Disk Queue Full Diagnostic Failure Clear TAP 107 TLP Inhibit Diagnostic Failure Clear TAP 109 TLP Queue Blockage Diagnostic Failure Clear TAP 108 TLP Tape Ac...

Page 6: ...DATA TTY Printout DGN NCLK 0 CHAIN a PH b STF ANALY TLPFILE NCLK 0 CHAIN a SUMMARY DATA TTY Printout DGN NCLK 0 CHAIN a PH b STF ANALY TLPFILE NCLK 0 CHAIN a NULL PACK TEST GENERATED QUEUE ACCESS DEN...

Page 7: ...SUSPECTED FAULTY EQUIPMENT TTY Printout DGN SCLK 0 IPUB a CONTR b NCSU 0 PH c STF ANALY TLPFILE SCLK 0 IPUB a CONTR b NCSU 0 SUSPECTED FAULTY EQUIPMENT Note Column Contains NOTE 2 Code Column Contains...

Page 8: ...b NCSU 0 PH c STF TTY Printout DGN SCLK 0 NCSU 0 PH a STF ANALY TLPFILE SCLK 0 NCSU 0 SUSPECTED FAULTY EQUIPMENT ANALY TLPFILE SCLK 0 IPUB a CONTR b NCSU 0 NULL PACK TEST GENERATED QUEUE ACCESS DENIE...

Page 9: ...STF ANALY TLPFILE SCLK 0 IPUB a CONTR b NCSU 0 TLP WARNING VERSION x DOES NOT MATCH EXPECTED VERSION y TAP 111 TAP 110 TTY Printout REPT NCSU 0 OSC RANGE EXCEEDED Repetitive Messages Disciplined Rubi...

Page 10: ...ired for this frame The readiness of this frame to become a part of the working system was established by the successful completion of Installation Handbook test procedures ACCEPTANCE 234 151 013 002...

Page 11: ...BELOW IN THE ORDER LISTED 1 2 CHECK POWER ORING DIODES FB211 CIRCUIT PACK Check for Open Diodes in FB211 Circuit Pack Check for Shorted Diodes in FB211 Circuit Pack DLP 535 DLP 534 NTP PAGE 1 of 1 23...

Page 12: ...otate ROS OFF Switch Fully Counterclockwise On Power Switch Rotate ROS OFF Switch to ROS Replace PHASE Meter or PHASE LOCK OVEN TEMP Meter Response OFF NORM and PWR OFF Lamps Light Response OS and OFF...

Page 13: ...F Switch Fully Counterclockwise On Power Switch Rotate ROS OFF Switch to ROS Replace Meter Solenoid Operate MSO Switch Phase Lock Shunt PLS Switch or OSC OS Lamp Assembly Response OFF NORM and OS Lamp...

Page 14: ...d Is Greater Than Plus or Minus One Second From Minute Announced Correct System Clock Time of Day Between 2 02 AM and 2 12 AM If System Clock Time Was Corrected Notify Network Management of Time Chang...

Page 15: ...orrect System Clock Time of Day Hang Up Bureau of Standards Call If AMA Supported Office Record Time Change on AMA Transmittal Form E 5233 At Next Time Announcement Complete Message but Do Not Send By...

Page 16: ...Oscillator Manual Adjustment Unit From Oscillator On Clock Chain Power Switch Rotate ROS OFF Switch to ROS CAUTION Clock Chain of Oscillator Being Checked Must be Removed From Service And Then Powere...

Page 17: ...onverter If Replaced Converter Is Type J87389 Adjust Associated 39B Oscillator Frequency 2 3 1 REPLACE DC DC CONVERTER Rotate ROS OFF Switch to Normal Position Response OFF NORM and OS Lamps Extinguis...

Page 18: ...Align 39B Oscillator Using Open Loop Method On Power Switch Rotate ROS OFF Switch Fully Counterclockwise CHECK 39B OSCILLATOR Check Full Frequency Range of Oscillator Check 39B Oscillator Calibrate Sc...

Page 19: ...ck DRO Oscillator Status Indicators On Clock Chain Power Switch Rotate ROS OFF Switch to ROS CAUTION Clock Chain of Oscillator Being Checked Must be Removed From Service And Then Powered Down REPLACE...

Page 20: ...anual Adjustment Unit to J20 Connector of DRO Oscillator Check Full Frequency Range and Alarm Bits of DRO Oscillator If Manual Update is Required Align DRO Oscillator Using Open Loop Method Check DRO...

Page 21: ...faulty equipment list these common trouble clearing approach The Task Index List is structured to provide fast When documenting a procedural approach to trouble with this list If a suspected faulty e...

Page 22: ...tware is assumed to be good equipment list and provides a step by step procedure for replacing circuit packs one at a time and analyzing the results This level is straightforward and requires some fam...

Page 23: ...4 25 32 D OFF ON SW J B2 D2 B3 D3 PWR OFF OFF NORM ACK B4 D4 B1 D1 K B5 D5 OS ROS OFF KEY LAMP TEST SW OFF SW OFF KEY ROS G E F 11 12 10 9 Y W 27 28 L1 C 6 5 ON SW 19 20 H ON SW 33 OFF SW ON SW POWER...

Page 24: ...ce and disable all oscillators before working on any network using ENABLE 2 TLP list helper ID field lists diagnosed chain equipment Usually list contains suspect other than for chains equipment liste...

Page 25: ...first pack on 14 Does TLP 18 Repeat CLEAR DIAGNOSTIC FAILURE USING TLP SUSPECT PACK LIST RST NCLK 0 CHAIN UCL RMV NCLK 0 CHAIN a list suspect ONLY ONE CLOCK CHAIN OUT OF SERVICE diagnostic failure by...

Page 26: ...ure by analyzing raw 22 Clear in Step 12 Page 2 diagnostic failure by analyzing raw 24 Clear error in oscillator of chain that did not restore 27 Clear level error problem Yes No CHAIN 0 00402001 0040...

Page 27: ...r next pack in failed SCLK half listed 6 Clear diagnostic failure by analyzing raw list located in failed SCLK half 1 See CAUTION 1 Identify first pack on TLP CAUTION 1 Always remove NCSU from service...

Page 28: ...roblem ENABLE DISABLE AND diagnostic result listed packs next listed pack in failed No Yes in failed NCSU been replaced NCSU failure by analyzing 3 Is 4 Have all 5 Repeat from Step 2 for 6 Clear diagn...

Page 29: ...those previously replaced CLEAR DIAGNOSTIC FAILURE BY ANALYZING RAW DATA AND Step 6 Page 3 Page 3 SUMMARY TABLE A 1 See CAUTION 1 Obtain diagnostic CAUTION 1 Always remove NCSU from service and disabl...

Page 30: ...IN PHASE PIDENT SUPPLEMENTARY DATA WORD INNERMOST DOLOOP INDEX VALUE AT TIME OF FAILING TEST NEXT INNERMOST DOLOOP INDEX VALUE AT TIME OF FAILING TEST OUTERMOST DOLOOP INDEX VALUE AT TIME OF FAILING...

Page 31: ...ay TABLE B microprocessor failure at index address of FG55 57 61 62 63 73 FG61 62 64 65 FG60 63 64 75 8 Locate DIAL statement PUMACRO DIAL subroutines called or phase PIDENT if no in last subroutine c...

Page 32: ...eft of each listing page subroutines called CLEAR DIAGNOSTIC FAILURE BY ANALYZING RAW DATA called Page 5 AND Page 5 unit containing first to determine failing test fifth word from mismatch fifth data...

Page 33: ...dentify SD lead in Using PR prologue data knowledge of failing test indicated by mismatch NOTE 4 register read Fault read or in path of write that set up read PK 4A037 02 4A014 01 UNIT DOCUMENTATION T...

Page 34: ...CLEAR DIAGNOSTIC FAILURE BY ANALYZING RAW DATA RST SCLK 0 IPUB b CONTR c NCSU 0 suspect packs to a PUMACRO statement diagnostic 29 Any more 30 Was failing STF DIAL statement failure by looping over f...

Page 35: ...ailing bits to isolate and clear fault in TAP 105 SDs CDs and circuit pack SDs trace signal Page 2 1a EX SCLK O CONTR a IPUB b NCSU 0 START twice a failing controller member number b failing IPUB memb...

Page 36: ...trace signal path of 11 Connect external sweep trigger to 0 1 60 36 terminal 104 STARTED CLEAR DIAGNOSTIC FAILURE BY LOOPING OVER FIRST FAILING TEST message 3 TABLE A Page 1 deleting RPT 2 option Resp...

Page 37: ...ssages delete CLEAR DIAGNOSTIC FAILURE BY LOOPING OVER FIRST FAILING TEST see previous message response TABLE B TABLE C RPT or DLP 508 if RST SCLK 0 CONTR b IPUB c NCSU 0 DGN SCLK 0 CONTR b IPUB c NCS...

Page 38: ...No CLR TLPQUEUE TLPFILE a queue c failing chain or DGN NCLK 0 CHAIN c TLP 1 See CAUTION 1 OP TLPQUEUE ALL Enter 3 Enter DGN SCLK 0 CONTR a IPUB b NCSU 0 TLP NOTE 1 It may take several may be monitore...

Page 39: ...LK 0 CONTR a IPUB b NCSU 0 TLP or Yes 3 Enter ALW NOTE 1 It may take several may be monitored by minutes for list to be printed Status of your file TLP file currently being processed is asterisk in OP...

Page 40: ...messages listed in TABLE B for NCLK SCLK NCSU 11 Clear diagnostic failure using TLP suspect pack list 8 Type INIT ALW and DGN DGN NCLK 0 CHAIN c TLP 9 See NOTE 1 Page 1 Is printed response CLEAR DIAG...

Page 41: ...t to be printed Status of your file TLP file OP TLPQUEUE ALL indicated by CAUTION 1 Always remove NCSU from service and disable all oscillators using switch before working on any network clock problem...

Page 42: ...TLP 2 Did TLP reoccur No Is printed response NOTE 1 It may take several may be monitored by currently being processed is asterisk in priority column minutes for list to be printed Status of your file...

Page 43: ...ators using switch before working on any network clock problem ENABLE DISABLE entering TABLE A with TLP tape mounted a member number of TUC b failing controller c failing IPUB member number AND DGN SC...

Page 44: ...IN d TLP SET TUC a FUNCTION TLP 2 Demount tape 3 Mount correct tape and DGN messages for 1 See CAUTION 1 If TLP tape being used does not contain NCLK SCLK NCSU data file obtain correct TLP tape 4 Ente...

Page 45: ...CLK ALW TLP SRCH SCLK or d failing chain NCSU SET TUC a FUNCTION TLP DGN NCLK 0 CHAIN d TLP DGN SCLK 0 CONTR b IPUB c NCSU 0 TLP or 1 See CAUTION 1 Mount TLP tape It may take several may be monitored...

Page 46: ...k list a failing controller or DGN NCLK 0 CHAIN c TLP NOTE 1 It may take several may be monitored by asterisk in priority column minutes for list to be printed Status of your file TLP file currently b...

Page 47: ...ER J87368C 9V 2 3 9V 24VB 24VA NETWORK CLOCK NC00 NETWORK CLOCK NC01 SYSTEM CLOCK NETWORK CLOCK SYNCHRONIZATION UNIT 24V 24V 9V 24V 9V 24V 24V 24V 24V 24V FS 7 FS 7 FS 7 FS 7 FS 12 FS 7 FS 7 FS 12 FS...

Page 48: ...24 VOLT FRAME DISTRIBUTION SD 4A014 02 BAY 1 TO DC POWER DISTRIBUTION CIRCUIT 24VA 24VB FILTER UNIT 24V 9V CONVERTER J87368C 9V CONVERTER J87368C 2 3 J1A053AG FS8 FS8 F011 NETWORK CLOCK NC10 NETWORK C...

Page 49: ...NETWORK CLOCK FRAME 24VLA1 24VLB1 9 AND 24 VOLT FRAME DISTRIBUTION BAY 1 SD 4A014 02 FROM 24V FILTER UNIT FROM 9V DC DC CONVERTERS 24VA 24VB 9V 9V NETWORK CLOCK FRAME BAY 0 SD 4A014 02 ISD 115 ISD 11...

Page 50: ...rs using switch before working on any network clock problem ENABLE DISABLE lamps extinguish FUSE PACKS BAY 1 1AA2 1 78 03 1 78 20 1 66 31 1 66 34 1 78 52 1 66 37 1 66 40 1 66 33 1 66 39 1 78 68 1 56 5...

Page 51: ...7 Does 21 Any VOLT DISTRIBUTION CLEAR BLOWN FUSE NOT A1 A9 OR B1 B8 9 AND 24 AND Step 35 Page 3 Page 3 AND AND Yes from for short near mounting of pack replaced NOTE 1 Packs in vertical covers of phas...

Page 52: ...USE NOT A1 A9 OR B1 B8 9 AND 24 TABLE A Page 1 AND ROS OFF switch to normal position OFF NORM and OS lamps extinguish extinguishes VOLT DISTRIBUTION PWR OFF lamp unseated No Yes 30 Depress ROS OFF swi...

Page 53: ...OWER DISTRIBUTION CIRCUIT TO DC POWER 24V 24V 24V 24V 24V 140VA 140VB 140VA 140VB 24V 24V 24V 140VA 140VB 24V 24V 140VB 24V 24V 24V 24V OTDS2 48VA 48VB 0A0A OAOD J87407B J87407B DISTRIBUTION CIRCUIT T...

Page 54: ...8 59 J87407B 3V CONVERTER 1 23 56 J87399A 9V CONVERTER 1 17 66 J87368C 5V CONVERTER 1 19 42 J87389S FS 6 FS 6 FS 8 FS 13 FS 8 FS 13 FS 8 FS 8 FS 8 FS 8 FS 8 FS 8 FS 13 FS 13 FS 11 24VA 24VB 24V0 24V1...

Page 55: ...AIN 3 BAY 1 SD 4A014 02 FROM FRAME POWER SWITCH CHAIN 0 FROM 24V FILTER UNIT FROM FRAME POWER SWITCH CHAIN 1 FROM DC POWER CIRCUIT FROM FRAME POWER SWITCH CONTROL 0 FROM DC POWER CIRCUIT NETWORK CLOCK...

Page 56: ...tarily OFF NORM and PWR OFF lamps lamps light ACK ROS OFF switch to normal position OFF NORM and OS CAUTION 1 Always remove NCSU from service and disable all oscillators using switch before working on...

Page 57: ...3 56 1 18 59 1 17 66 1 23 56 1 18 59 1 17 66 1 12 50 1 23 14 1 18 14 1 23 56 1 18 59 1 17 06 1 17 66 1 18 50 1 23 50 1 60 52 1 12 22 1 12 50 BAY 1 0 48 09 FED AT LOCATION 0TDS0 0B0A 0TDS1 0B0B 0A0A 0A...

Page 58: ...tton for 2 seconds 20 Does 14 Does 140 VOLT DISTRIBUTION pushbutton for 2 seconds lamp goes off PWR OFF lamp goes off PWR OFF 10 If blown fuse is ODC 1DC or 0DD 1DD remove 0B0A 1B0A or 0BOB 1BOB respe...

Page 59: ...itch 32 Seat all converters 33 Replace any removed fuse pushbutton for 2 seconds 28 Does 29 Investigate 30 Are any 34 Rotate lamp goes off goes off PWR OFF lamp goes off PWR OFF lamp CLEAR BLOWN FUSE...

Page 60: ...blown TABLE A CAUTION 1 Always remove NCSU from service and disable all oscillators using switch before working on any network clock problem ENABLE DISABLE 2 Are both A and B fuses AND Yes identify F...

Page 61: ...47 74 46 74 54 74 52 74 17 74 19 74 24 74 25 fuse leads for short using 17 Did 18 Investigate blown fuse A3 A4 A5 A6 A7 A8 A9 FB211 PACK LOCATION TO FUSE ASSIGNMENT TABLE A 16 Replace FB211 blow CLEAR...

Page 62: ...for LED go off ON 2 Depress converter 3 Did ON switch circuitry for clearing LED lamps No pushbutton 1 See CAUTION 1 momentarily ROS OFF switch Rotate ROS OFF switch to ROS OS and OFF NORM lamps light...

Page 63: ...igate FB152 LOCATION switch for 2 seconds 0 78 03 1 78 03 0 78 68 1 78 68 0 56 52 1 56 52 FB152 pack TABLE A CHAIN 0 NCLK NCLK NCLK NCLK CHAIN 2 CHAIN 1 CHAIN 3 SCLK CONTR 0 SCLK CONTR 1 UNIT 1 See CA...

Page 64: ...isable all oscillators using switch before working on any network clock problem ENABLE DISABLE 5 At TTY enter TABLE A DIAGNOSTIC MESSAGE IPUBs are diagnosed with a NCLK chain 0 3 b controller number c...

Page 65: ...UTOMATIC POWER MONITOR TEST FAILURE 6 Replace circuit pack 7 Did out of step unit TABLE B message then respond ATP TAP TABLE B Page 1 8 At TTY enter appropriate DLP 509 DLP 500 or converter TAP PAGE 2...

Page 66: ...olding rear flathead screws and network switch rotate ROS OFF switch to ROS OS and OFF NORM are lighted OFF NORM and PWR OFF lamps PWR OFF lamp for 2 seconds to restore power 6 Depress and hold ON pus...

Page 67: ...source CLEAR METER SOLENOID OPERATE MSO LAMP AND PHASE OR PHASE LOCK OVEN TEMP METER RESET FAULT and ground Page 8 14 If OVEN TEMP meter is more than 2 divisions off center wait 10 rotate ROS OFF swit...

Page 68: ...ESET FAULT 15 Connect 16 Is 18 Move 19 Is 20 Are meters 21 At clock chain power switch 22 Replace defective meter counterclockwise to normal rotate ROS OFF switch than 2 divisions off center wait 10 m...

Page 69: ...e as necessary trouble in wiring MSO switch No Yes No Yes trouble in wiring MSO switch CLEAR METER SOLENOID OPERATE MSO LAMP AND PHASE OR PHASE LOCK OVEN TEMP METER RESET FAULT 25 Does 24 26 Does 28 C...

Page 70: ...ER RESET FAULT operate 38 Release 39 Do meter reset arms release immediately CLEAR METER SOLENOID OPERATE MSO LAMP AND PHASE OR PHASE LOCK 37 Does MSO lamp and PHASE LOCK OVEN TEMP meter reset arms MS...

Page 71: ...itch 43 Replace fuse removed 44 Depress ON switch to pushbutton appropriate chain MSO operate 47 Release 48 Do meter reset arms release immediately No Yes Yes 46 Does MSO lamp and PHASE LOCK OVEN TEMP...

Page 72: ...Do meter reset arms release immediately operate 54 Release MSO pushbutton 53 Does MSO lamp and PHASE LOCK OVEN TEMP meter reset arms CLEAR METER SOLENOID OPERATE MSO LAMP AND PHASE OR PHASE LOCK OVEN...

Page 73: ...chain 58 At front of frame install network 59 At rear of frame install six screws 60 Depress ON pushbutton to restore 61 If OVEN TEMP meter is more than CLEAR METER SOLENOID OPERATE MSO LAMP AND PHAS...

Page 74: ...itch to 5 At rear of frame remove six 6 At front of frame remove four 1 See CAUTION 1 Obtain volt ohmmeter KS 14510 CLEAR R1 OR PLS FAULT 39B OSCILLATOR R1 PLS 2 At appropriate power switch PLS SCREWS...

Page 75: ...en pin 3 of 17 Rotate ROS OFF switch position to restore clock chain to service counterclockwise to normal and negative terminal of Step 7 Page 1 AND AND 10 Operate PLS switch PLS 13 Replace PLS switc...

Page 76: ...e FB214 circuit pack 2 166 33 178 20 CHAIN 0 1 a clock chain 0 3 with clock chain being tested TABLE A 3 See NOTE 1 Depress MSO switch 7 See NOTE 1 Depress MSO switch 066 33 078 20 066 39 078 52 2 Rep...

Page 77: ...power switch RST NCLK 0 CHAIN a COMPL rotate ROS OFF switch counterclockwise 14 Check oscillator in Step 6 Page 1 but circuits SD 4A036 AND AND lamps extinguish OFF NORM and OS Depress MSO switch 10 I...

Page 78: ...11 PACK LOCATION TO FUSE ASSIGNMENT A3 A4 A5 A6 A7 A8 A9 AND Page 2 1 See CAUTION 1 Replace FB211 circuit 78 46 78 45 74 67 74 04 78 25 78 26 78 42 78 41 74 56 74 55 74 15 74 16 78 29 78 30 voltage te...

Page 79: ...trouble cleared Yes No No Yes 4 Is voltage 6 Replace 7 Have all 8 Repeat from 5 See NOTE 1 Repeat from Step 1 listed under or using next location across TABLE A Page 1 in Step 2 Page 1 using next fus...

Page 80: ...IT OSC OUTPUT SELECT GENERATION OSC CTL AND MON FA628 DRIVERS FB217 SUPPLY PIN 116 1 5V PIN 209 1 5V 24 VOLT PIN 009 PIN 1 3 PIN 2 24V 0V APPROXIMATE VOLTAGE TO LIGHT LAMP OS LAMP 24V PL 234 151 013 1...

Page 81: ...70 29 178 52 170 42 0 1 2 3 CIRCUIT PACK FB217 FA628 4 See NOTE 1 and TABLE A Replace original 5 See NOTE 1 and TABLE A Replace FA628 1 See CAUTION 1 NOTE 1 and TABLE A Replace FB217 pack LOCATION pos...

Page 82: ...U from service and disable all oscillators using switch before working on any network clock problem ENABLE DISABLE 5 Measure DC TABLE A POSITIVE PIN 1 1 1 1 GROUND LEAD 0 5T00 0 5T01 1 5T00 1 5T01 PIN...

Page 83: ...not master oscillator TABLE B plug P18 9 At TTY type 11 See Note 1 Determine TABLE B 10 Convert to binary 12 Select oscillator in DUMP NCLK 0 CREG AND Page 3 Yes 13 At selected oscillator chain switch...

Page 84: ...thumbwheel setting BINARY HEX 0 0 0 0 0 13 12 11 10 9 8 7 6 5 4 3 2 1 1 1 1 1 1 1 1 1 1 LED POSITION TOP BOTTOM NUMBER NUMBER 14 of oscillator manual adjustment LED THUMBWHEEL 2 A 9 F Oscillator LED...

Page 85: ...word into second oscillator 20 Disconnect oscillator manual adjustment 22 Call 4ESAC for assistance 21 At second oscillator chain power switch rotate ROS OFF switch to counterclockwise AND position b...

Page 86: ...ch to normal 23 Disconnect oscillator manual 26 At power switch rotate 27 Repair suspect faulty cabling RST NCLK 0 OSC a oscillator oscillator RST NCLK 0 RST NCLK 0 c chain of requested c chain of req...

Page 87: ...BLM on SCLK O out of service 3 Is Network Clock Sync Unit out of service No Yes Yes No 1 See CAUTION 1 Is any clock chain oscillator needing CLEAR PHASE ERROR 39B OSCILLATORS 4 See NOTE 1 NOTE 1 shoul...

Page 88: ...hain AND error a chain having phase error See NOTE 2 RST NCLK O OSC a RMV NCLK O OSC a a chain having phase 7 At TTY enter 8 At TTY enter CLEAR PHASE ERROR 39B OSCILLATORS NOTES 2 Oscillator reported...

Page 89: ...k TABLES A and C to master oscillator input terminal of FB213 14 See NOTE 4 Ensure chain 15 See CAUTION 2 Calibrate using the STROBE switch on 12 At TTY enter RMV SCLK 0 NCSU 0 Improper scope calibrat...

Page 90: ...27 Repeat Step 16 are lighted having phase error cleared OFF NORM and PWR OFF lamps Page 3 CONVERT TO BINARY 00000000 00100004 03600044 37760000 00006464 03670064 00000000 00000000 00000000 00100004 0...

Page 91: ...emove scope probe 37 Is waveform 38 Remove level 39 Replace Page 7 AND SLIDE SWITCH probe to terminal 018 of FB214 pack TABLE A Page 3 determined in Step 20 31 Connect channel 1 scope CLEAR PHASE ERRO...

Page 92: ...es waveform be adjusted to 1 9 volts peak to peak No between 0 87 and peak to peak 0 97 volts from terminal 018 probe and replace FB687 pack TABLE A of FB214 pack and 201 of FB687 pack TABLE A Page 3...

Page 93: ...nt cover Page 8 57 Is waveform 60 Is 66 Remove level 67 Replace 68 Can 65 Repeat 64 Correct 63 Is 62 Remove probe 61 Remove 58 Replace 59 Repeat from Step 31 Page 5 from Step 31 Page 5 connect it to t...

Page 94: ...llator being checked must be powered down CAUTIONS 3 Remove RF 4 Clock chain of OUTPUT cable not physically oscillator manual adjustment frequency hi low bits 74 See CAUTION 4 Connect 76 Check 39B osc...

Page 95: ...ess MSO pushbutton 88 Depress ROS OFF switch to CLEAR PHASE ERROR 39B OSCILLATORS Page 14 connect cliplead between terminal 1 of PHR relay and frame ground TABLE D terminal 018 of FB214 pack at 2 scop...

Page 96: ...nd 2 4 volts between 0 87 and peak to peak 0 97 volts from terminal 018 of FB214 pack and connect it to terminal 201 of FB687 pack TABLE A Page 3 Page 12 CLEAR PHASE ERROR 39B OSCILLATORS 92 Is wavefo...

Page 97: ...EAR PHASE ERROR 39B OSCILLATORS 100 Repeat 102 Remove probe waveform 0 1V 103 Is 104 Remove level peak to peak and 105 Can 106 Remove probe Repeat from Page 9 adjust oscillator Yes Yes No waveform be...

Page 98: ...Yes waveform oscillator output Page 13 CLEAR PHASE ERROR 39B OSCILLATORS 110 Is 111 Correct 112 Remove oscillator 113 Can 114 Remove Yes waveform present touch it to center No from terminal 201 pin o...

Page 99: ...24 Is 125 Align 126 Repeat 116 See CAUTION 5 Remove 117 Install oscillator 118 See CAUTION 6 Connect 115 Ensure oscillator 24V CAUTIONS P13 immediately even if oscillator is not physically removed imm...

Page 100: ...lator manual adjustment enter into oscillator by 130 Connect oscillator manual CLEAR PHASE ERROR 39B OSCILLATORS office timing references port equipped 128 Is 129 Align 39B oscillator having phase err...

Page 101: ...MEASURE BETWEEN CONN TERM B D E F Ground Ground Terminal 9 Terminal 9 Infinity reading between 3 9 and 4 1 volts of PHR relay TABLE E Page 16 Page 17 138 Is voltage 139 Remove FREQ 140 Were 141 Correc...

Page 102: ...down 7 Remove RF 8 Clock chain of OUTPUT cable oscillator manual adjustment oscillator manual adjustment frequency hi low bits 142 See CAUTION 7 Remove 144 See CAUTION 8 Connect 146 Check 39B oscilla...

Page 103: ...ce FB214 pack depress MSO CLEAR PHASE ERROR 39B OSCILLATORS 161 Contact next higher level of technical support for assistance Step 162 and depress enter thumbwheel setting offset by HEX 0080 from read...

Page 104: ...SD 4A036 01 to setting recorded in by depressing LOAD load into oscillator Page 17 169 Release 170 Readjust 168 Check for 174 Repeat from Step 157 175 Clear 173 Is 172 On FB214 pack 171 Disconnect PLS...

Page 105: ...ared a chain having phase a next chain to have RST NCLK 0 CHAIN a 39B oscillators Step 16 for 180 Enter 182 At TTY enter Ensure chain is powered up before restoring unconditionally NOTE 7 CLEAR PHASE...

Page 106: ...ame direction METER indications Page 2 1 See CAUTION 1 on more than one chain indicate one divisions from zero CLEAR NCLK CHAIN PHASE METER ERROR CAUTION 1 Always remove NCSU from service and disable...

Page 107: ...nditionally TAC for 12 Clear phase 11 Type RMV NCLK 0 CHAIN a 9 Was 10 Call CLEAR NCLK CHAIN PHASE METER ERROR CHAIN MASTER 0 1 0 0 0 0 1 2 3 TABLE A determine master clock a chain that failed BINARY...

Page 108: ...rvice OS lamp 2 Is diagnosed Yes chain out of 3 TABLE A No No restoral complete 5 Did 4 See lighted chain being 8 Is this Yes diagnosed 9 Clear CAUTION 3 diagnostic failure using TLP pack list Yes Ent...

Page 109: ...12 14 or 15 18 Did 16 Is this 12 Is suspect 14 On raw data 15 Using raw data 20 Clear diagnostic failure using TLP pack list diagnostic failure using TLP pack list 22 Clear message 6 printout does one...

Page 110: ...t of service 3 Connect scope probe to terminal 018 of FB214 pack FB214 TABLE A 1 See CAUTION 1 Ensure faulty 2 See CAUTION 2 070 37 070 34 FB687 FB215 FA628 070 31 070 29 070 42 070 40 170 31 170 29 1...

Page 111: ...te message received circuit pack Page 1 and repeat from Step 8 11 Contact next higher level of technical support for assistance Yes No No 10 Has FA628 12 Replace FA628 Yes No circuit pack been replace...

Page 112: ...R LEVEL ERROR PROBLEM 17 Remove probe 18 Repeat 20 Replace 19 Remove level SLIDE SWITCH Page 4 Yes No peak to peak Yes No peak to peak between 0 87 and 0 97 volts between 1 4 and 2 4 volts terminal 20...

Page 113: ...ck from Step 3 Page 1 CLEAR 39B OSCILLATOR LEVEL ERROR PROBLEM 33 See TABLE A 32 Can 31 Replace 30 Remove level 29 Is Page 6 and replace FB687 RST NCLK 0 CHAIN a 25 Type 24 Remove 27 Repeat 28 Remove...

Page 114: ...an 45 Remove 46 Repeat Page 6 Yes waveform present touch it to center waveform present No No Yes connector P13 problem using output jack pin of oscillator output cable oscillator of FB687 pack and con...

Page 115: ...at CAUTIONS immediately P13 output cable even if oscillator is not physically removed immediately oscillator must be powered down being checked 3 Remove RF 4 Clock chain of 47 Check oscillator 24V 48...

Page 116: ...ch to alternate reference by entering SW SCLK 0 REF 1 No FREERUN 10 MINUTES 1 See CAUTION 1 2 Wait for Step 1 TTY REPT NCSU 0 No message printed out Is TTY message CAUTIONS 1 Always remove NCSU from s...

Page 117: ...RUN LAMP LIGHTED MCC SYSTEM ALARMS PANEL sync reference No Yes complete response received sync coordinator for assistance 7 Check DS1 8 Contact 6 Is restore signal DLP 550 TAP PAGE 2 of 2 234 151 013...

Page 118: ...LEAR EXCESSIVE SLIPS IN YOUR OFFICE your office for other trunk groups DGN SCLK 0 NCSU O Page 4 Page 2 Page 3 Page 5 5 Is far end having trunk group with excessive slip in your office 1 See CAUTION 1...

Page 119: ...ce to manually No Yes No Yes 7 Does far end 8 Request far end 9 Request far end 11 Request far end diagnostic ATP adjust oscillators office to diagnose far end office 10 Was adjust oscillators CLEAR E...

Page 120: ...No Yes Yes No TABLE A a member number containing DSI reference b submember number office have DS1 containing DS1 as regular DIF TOP 234 151 055 CLEAR EXCESSIVE SLIPS IN YOUR OFFICE DGN DT a DIU b DGN...

Page 121: ...or for assistance CLEAR EXCESSIVE SLIPS IN YOUR OFFICE office experiencing Page 5 Page 5 20 Switch NCSU 21 Monitor slips in your office for 24 hours SW SCLK 0 REF 1 REF STAT lamp lights reference sign...

Page 122: ...taining DS1 NCSU equipped with ATP ATP 27 Was 28 Clear NCSU 29 Is the office 30 Using 31 Is CLEAR EXCESSIVE SLIPS IN YOUR OFFICE failure 33 See NOTE 1 Page 1 DGN SCLK 0 NCSU 0 26 At TTY enter a member...

Page 123: ...ST NCLK 0 OSC a 1 See CAUTION 1 Is replacement 2 See NOTE 1 At TTY enter at TTY enter a oscillator removed in Step 2 NOTE 1 replacement 39B oscillator Order should be placed for CAUTION 1 from service...

Page 124: ...IVE 39B OSCILLATOR RANGE EXCEEDED MESSAGE NCSU CAUTIONS P13 immediately even if oscillator is not physically removed immediately oscillator being checked must be powered down 2 Remove RF 3 Clock chain...

Page 125: ...ted oscillator chain power switch rotate 3 See NOTE 1 Determine Page 2 master clock chain TABLE B DUMP NCLK 0 CREG 2 Convert to binary 4 Select oscillator in RANGE PROBLEM CLEAR DISCIPLINED RUBIDIUM O...

Page 126: ...e 3 6 Connect oscillator manual adjustment unit to oscillator selected in Step 4 Page 1 7 At selected oscillator hex oscillator manual adjustment 8 Check full frequency range and alarm RANGE PROBLEM u...

Page 127: ...lator 12 Disconnect oscillator manual adjustment 13 At second oscillator chain power switch 14 Call thumbwheels to original frequency word by depressing LOAD pushbutton RANGE PROBLEM recorded in Step...

Page 128: ...b first oscillator removed from service position ROS switch to normal oscillator oscillator c chain of requested c chain of requested RANGE PROBLEM 18 At power switch rotate 19 Suspect faulty oscillat...

Page 129: ...lator needing 4 See NOTE 1 NOTE 1 CAUTION 1 This procedure calls for UCL restores of out of service chains Contact next level of technical assistance support for switches on all DRO CLEAR PHASE ERROR...

Page 130: ...error a chain having phase error See NOTE 2 RST NCLK O OSC a RMV NCLK O OSC a a chain having phase 7 At TTY enter 8 At TTY enter CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS NOTES 2 Oscillator...

Page 131: ...sure chain 15 See CAUTION 2 Calibrate 12 At TTY enter RMV SCLK 0 NCSU 0 phase error cleared DUMP NCLK 0 CREG CLOCK CHAIN 0 070 32 066 33 070 34 CIRCUIT PACK with phase error FB213 FB214 FB687 is out o...

Page 132: ...hain 25 Replace FB213 pack TABLE A 28 Remove channel 1 scope probe from 27 Repeat Step 16 29 See NOTE 5 Enter CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS Page 3 CONVERT TO BINARY to peak Yes No...

Page 133: ...aveform 38 Remove level 39 Replace Page 7 AND 34 See NOTE 5 Page 4 Enter 35 Enter RST NCLK 0 CHAIN a UCL CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS probe to terminal 018 of FB214 pack TABLE A...

Page 134: ...AIN a UCL 47 Enter Yes No connect it to terminal Yes waveform be adjusted to 1 9 volts peak to peak No between 0 87 and peak to peak 0 97 volts from terminal 018 probe and replace FB687 pack TABLE A o...

Page 135: ...Is waveform 60 Is 66 Remove level 67 Replace 68 Can 65 Repeat 64 Correct 63 Is 62 Remove probe 61 Remove 58 Replace 59 Repeat from Step 31 from Step 31 Page 5 RF OUTPUT RF output probe from Yes termi...

Page 136: ...indicates INIT Hex display indicates 2000 78 Check DRO oscillator FREE RUN RF OUTPUT is disabled FREE RUN LED is out MAJOR alarm LED is out RF OUTPUT is enabled MAJOR alarm LED is lighted When initia...

Page 137: ...1 of PHR relay terminal 018 of FB214 pack at 2 scope probe to location TABLE A Page 3 CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS 87 Depress ROS OFF switch to 85 Momentarily depress MSO pushbut...

Page 138: ...eak 0 97 volts from terminal 018 of FB214 pack and connect it to terminal 201 of FB687 pack TABLE A Page 3 Page 12 91 Is waveform 92 Remove level adjustment cover from DRO 93 Remove probe 94 Is wavefo...

Page 139: ...1V Repeat from Page 9 adjust oscillator 99 Repeat 101 Remove probe 102 Is 103 Remove level 104 Can CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS Yes Yes No waveform be adjusted to 1 9 volts peak...

Page 140: ...form oscillator output cable problem Page 13 Yes waveform present touch it to center No from terminal 201 pin of oscillator output jack of FB687 pack and connector P13 RF OUTPUT CLEAR PHASE ERROR DISC...

Page 141: ...method CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS RF OUTPUT is disabled Hex display indicates INIT MAJOR alarm LED is lighted FREE RUN initialize During initialization When initialization is c...

Page 142: ...Page 16 Yes No 126 Is 127 Align DRO 129 Set oscillator manual adjustment 130 Did 131 Repeat from Step 129 changing 133 Remove oscillator 48V unit thumbwheels to 2000 and depressing LOAD pushbutton ent...

Page 143: ...Ground Ground Terminal 9 Terminal 9 Infinity reading between 3 9 and 4 1 volts Page 16 Page 17 136 Is voltage 137 Remove FREQ 138 Were 139 Correct CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS T...

Page 144: ...1 Install DRO oscillator 142 See CAUTION 8 Connect 143 Allow DRO oscillator to FREE RUN RF OUTPUT is disabled FREE RUN LED is out MAJOR alarm LED is out RF OUTPUT is enabled approximately 20 min 146 C...

Page 145: ...IDIUM OSCILLATORS 157 See NOTE 6 Repeat from Step 152 setting offset by HEX 1E00 from reading recorded in Step 159 pushbutton and depress LOAD higher level of technical support for assistance 150 Remo...

Page 146: ...ad into oscillator Page 17 PLS pushbutton 171 Repeat from Step 154 170 Is 169 On FB214 pack measure DC voltage Yes 168 Disconnect 165 Check for 167 Readjust 166 Release Step 159 Page 17 and CLEAR PHAS...

Page 147: ...ch oscillator 177 Enter CLEAR PHASE ERROR DISCIPLINED RUBIDIUM OSCILLATORS DRO oscillators Ensure chain is powered up before restoring unconditionally NOTE 7 176 Repeat No phase error cleared a chain...

Page 148: ...between 1 8 and 2 0 volts 4 Is waveform 5 Remove AND TABLE A Calibrate scope chain is out of service 3 Connect scope probe to terminal 018 of FB214 pack TABLE A 1 See CAUTION 1 Ensure faulty 2 See CA...

Page 149: ...chain CLEAR DISCIPLINED RUBIDIUM OSCILLATOR LEVEL ERROR PROBLEM Yes 6 Has FB215 circuit pack been replaced 7 Replace FB215 circuit pack TABLE A Page 1 No Page 1 and repeat from Step 8 11 Contact next...

Page 150: ...illator 18 Repeat Page 4 20 Replace 17 Remove probe 19 Remove level Yes No peak to peak Yes No peak to peak between 0 87 and 0 97 volts between 1 4 and 2 4 volts terminal 201 of error No connect it to...

Page 151: ...ISCIPLINED RUBIDIUM OSCILLATOR LEVEL ERROR PROBLEM Yes No from pack TABLE A and replace FB687 of FB687 pack Page 1 33 See TABLE A 31 Replace 32 Can 30 Remove level Page 6 29 Is 25 Enter 27 Repeat 24 R...

Page 152: ...PROBLEM connector Page 1 Yes waveform present touch it to center waveform present No No Yes from terminal 201 P13 problem using output jack pin of oscillator output cable oscillator of FB687 pack and...

Page 153: ...ustment During initialization approximately 20 min FREE RUN MAJOR alarm LED is out RF OUTPUT is disabled FREE RUN LED is out RF OUTPUT is enabled 54 Check DRO oscillator 50 See CAUTION 4 Connect 49 In...

Page 154: ...ys remove and disable all switch before working on any network clock problem ENABLE DISABLE oscillators using NCSU from service FUSES FUSE LOCATION BAY HMP 0 0 1 1 07 07 07 07 DC DD DC DD a out of ran...

Page 155: ...full frequency range FREE RUN and alarm bits of DR0 10 See CAUTION 2 Remove DR0 17 Check DR0 oscillator 12 See CAUTION 3 Connect initialize During FREE RUN LED is out RF OUTPUT is enabled 11 Install D...

Page 156: ...40VB DISCIPLINED RUBIDIUM OSCILLATOR FS 1 DRO OSCILLATOR 033 56 24V 24V DISTRIBUTION CIRCUIT 24V FS 12 CONTROL 0 056 69 140VA CHAIN 0 066 03 FILTER UNIT 24V J1A053AG FS 7 CHAIN 1 066 68 24V 140VB TO D...

Page 157: ...NVERTER 24VS1 140VA 140VB 140VA 24V 24VS1 140VB 24VLB 48VA 48VB 1AOS 48VB 24 48 AND 140 VOLT FRAME DISTRIBUTION BAY 1 DISCIPLINED RUBIDIUM OSCILLATOR FS 1 DRO OSCILLATOR 133 21 DRO OSCILLATOR 133 56 2...

Page 158: ...l 5 At rear of frame remove six R1 39 2 S N17 2 At appropriate power switch ensure power from clock chain OFF NORM and AND OSC OS PLS MSO SCREWS 6 PANHEAD FRONT CONTROL COVER REAR 1 See CAUTION 1 Obta...

Page 159: ...service counterclockwise to normal and negative terminal of Step 7 Page 1 AND AND 13 Replace PLS switch and 11 Using ohmmeter measure resistance between pin 3 of 10 Operate PLS switch 16 Depress and h...

Page 160: ...aced to ROS TABLE A Page 2 replacement pack REPLACE CIRCUIT PACK EXCEPT FB211 TYPE NOTES 1 Packs at locations located behind screw held covers of phase lock 2 When packs at locations 66 31 15 minute w...

Page 161: ...BAY 0 OAB OHT0 OA10 OB9 OHT1 OCB OAA2 OSB OSC OSD OSD BAY 0 CHAIN 0 CHAIN 1 IPUB 0 CONTR 0 NCSU TABLE A PACK LOCATION BAY 0 BAY 1 78 17 78 20 60 27 to 60 40 56 52 56 53 66 39 70 37 to 70 52 74 38 to 7...

Page 162: ...ISABLE switch to ENABLE is in NCSU position each position OS FB687 pack used in frame 9 Is oscillator being oscillator used oscillator used DRO 12 Replace removed fuse 13 If replaced circuit pack 14 D...

Page 163: ...4 DLP I I I I l r I 0 J c n c n II II c n c n c c n c c n II II c c n c c n c n c n II II c n c n II II c n c n II II m c Il mii J m c Il mii J mii J m c Il m c Il mii J m c Il mii J m c Il m c Il c n...

Page 164: ...his PIDENT DETERMINE LOCATION AND FUNCTION OF SUBROUTINES CALLED 1 On raw data printout for first failing test locate last data word printed Page 3 AND AND In loader map symbols section 9 Read subrout...

Page 165: ...SUBROUTINE FIRST SUBROUTINE 000533 CALLSUB PUDGWXYZ CALLSUB PUDGABCD LISTING PUDGABCD LISTING PUDGWXYZ PHASE LISING SUBROUTINE NAME DETERMINE LOCATION AND FUNCTION OF SUBROUTINES CALLED 28360 0200000...

Page 166: ...E 1 On raw data printout the sixth digit in fifth data word following mismatch data indicates number of subroutines called 10 See NOTE 1 Have all subroutines been located Yes No 11 On raw data printou...

Page 167: ...to first 16 12 SP number 11 10 Matrix 09 04 Row 03 00 Column NOTE Section 234 180 020 contains a description third data word breaks down as follows 23 17 Don t care NOTE For scan point SD point and SP...

Page 168: ...rds following mismatch data A PUEA PUAB B PUWB bits 35 24 OPAD bits 35 29 OPCODE C PUWB bits 23 0 ADDRESS SECOND WORD AAAABBBB THIRD WORD CCCCCCCC ANALYZE FAILING TEST DATA TO DETERMINE TEST FUNCTION...

Page 169: ...LOCATION OF INFORMATION OPAD OPCODE SD point address Scan point address NETWORK CLOCK SYSTEM CLOCK CD4A037 01 02 CD4A036 01 TABLES H and I TABLES A and B VER SPMTXPK SCP MSN 0 a a scan point address V...

Page 170: ...lighted 4 Depress ON pushbutton clockwise to ROS go off counterclockwise 5 Rotate ROS OFF TEST POWER ALARM CIRCUITS OFF NORM and OS lamps go off switch 1 4 turn 3 See TABLE A on converters and Page 2...

Page 171: ...50 123 50 PUB UNIT LOCATION 060 52 160 52 078 03 178 03 078 68 178 68 NCLK UNIT LOCATION NCSU LOCATION 048 09 TABLE A LED LOCATIONS 050 27 UNIT CONTAINING LED TEST POWER ALARM CIRCUITS LED should not...

Page 172: ...fy location of associated doloop subroutine was called and look for endloop statements after data printout for first failing test are located Read any after CALLSUB statements until all doloops indica...

Page 173: ...CALLSUB PUDGABCD WXYZ900 ENDLOOP LABEL WXYZ300 000533 STM700 CALLSUB PUDGWXYZ STM1100 ENDLOOP LABEL STM500 ABCD800 ENDLOOP LABEL ABCD400 DOLOOP INNERMOST DOLOOP SECOND SUBROUTINE FIRST SUBROUTINE FIR...

Page 174: ...and 14 Have number of doloops indicated on raw data printout been located test EXPR data 17 Was this Subroutine Yes No No No Yes endloop statement closest Obtain doloop index value 13 See NOTES 1 and...

Page 175: ...lled 19 Note page and line number 20 Locate last address in this subroutine and note reference section 22 Is referenced 23 Are any endloop references 24 Was this 25 Locate called this subroutine Yes N...

Page 176: ...No No Yes 27 Locate doloop statement using label in parentheses at endloop statement location of 28 Does doloop 30 Read any comments at 29 Go to 32 Have number 33 Are any other statement 35 Was this 3...

Page 177: ...tatement and 47 Locate endloop Obtain doloop index value in Step 38 noted in Step 40 repeat from Step 42 In first failing phase PIDENT 39 Locate endloop MACRO in PIDENT reference statement noted 37 Lo...

Page 178: ...line number of EXPR data 4 Note endloop reference 8 Read any comment at doloop statement 9 See NOTES 1 and 2 Obtain doloop index value from raw data printout and note AND AND CALLED DETERMINE LOCATIO...

Page 179: ...TM2100 DOLOOP ITEM STM800 DOLOOP ITEM STM3000 EXPR DATA STM3900 ENDLOOP LABEL STM1200 STM4700 ENDLOOP LABEL STM800 002147 STM3500 ENDLOOP LABEL STM2100 FIRST FAILING PHASE LISTING M52 DGN SCLK 0 CONTR...

Page 180: ...mounted counterclockwise position mount reel 5 Rotate hub knob of upper reel clockwise lighted LOCAL lamp AND to detent to lock tape reel securely MOUNT TAPE ON TAPE UNIT Tape reel and take up reel mo...

Page 181: ...utton pushbutton BRAKE RELEASE pushbutton BRAKE RELEASE pushbutton BRAKE RELEASE pushbutton turns then release BRAKE RELEASE 12 Depress ARMS NORMAL release FORWARD is not twisted NOTE 1 MOUNT TAPE ON...

Page 182: ...OCAL REMOTE pushbutton to obtain REMOTE lighted condition 14 Depress 5 IPS 25 IPS pushbutton to obtain 25 IPS lighted condition MOUNT TAPE ON TAPE UNIT AND WARNING 4 Closing tape transport door may up...

Page 183: ...ent MACRO segment AUTO In first failing phase PIDENT in subroutine data address at first test is in in automatic test is not DETERMINE IF FAILING TEST IS IN AUTOMATIC SEGMENT If segment statement has...

Page 184: ...s Subroutine In subroutine where first failing test is located 10 Locate and note page 11 Locate and note page first failing test EXPR data 13 Is 14 Are any before EXPR data at failing test 16 Locate...

Page 185: ...No 27 Locate segment statement statement segment No 28 Is indicated 29 Failing 25 Was this subroutine called from phase or from another subroutine Yes Subroutine 26 Locate subroutine that called last...

Page 186: ...s 37 Failing automatic segment segment 38 Failing No Yes Yes No No Yes segment MACRO segment AUTO ON indicated In first failing phase PIDENT statement DETERMINE IF FAILING TEST IS IN AUTOMATIC SEGMENT...

Page 187: ...EST TEST IN FORCE SEGMENT 2 Note segment statement index word address for 3 Locate first segment statement after first follows segment statement located in Step 3 EX NCLK 0 RPT 2 PH a ADR b c EX SCLK...

Page 188: ...ABLE PWR OFF lamp goes off hold ON pushbutton for 2 seconds NCSU position each oscillator Converter LED goes off REPLACE CONVERTER seating of replacement converter switch for 2 seconds 5 Remove conver...

Page 189: ...HAIN 1 CHAIN 2 CHAIN 3 1BOA 1BOB 56 69 CONVERTER FUSES TABLE B LOCATION FUSE 07 20 07 51 LOCATION BAY 0 BAY 1 CONVERTER POWER SWITCH 60 52 12 22 17 06 18 14 19 31 23 14 12 50 17 66 18 59 19 42 23 56 1...

Page 190: ...s ARMS UNLOAD pushbutton 5 Depress and hold BRAKE RELEASE 6 See WARNING 2 Manually wind 7 Release BRAKE RELEASE pushbutton 8 Rotate hub knob of upper reel 9 Remove upper tape reel lamp lights OK DMT D...

Page 191: ...TSI unit identified associated units are remove these units appropriate TABLE D messages from service using 9 See CAUTIONS 2 and 3 Remove fuses in same bay as FB211 being replaced 8 Identify A and B f...

Page 192: ...es 12 Insert and ensure proper seating of replacement pack 13 Install fuses removed in Step 9 Page 1 14 Restore units removed from service in Steps 3 5 or 7 Page 1 using AND appropriate TABLE E Page 6...

Page 193: ...h bay connected to an NE 01489 31 assembly mounted at location 170 280 This assembly then connects to a sync converter circuit NS 01489 01 located in the transmission area This is used to provide a sy...

Page 194: ...74 23 A8 B8 74 24 A9 B7 74 25 A9 B8 74 46 A9 B2 74 47 A9 B1 74 48 A8 B2 74 49 A8 B1 74 50 A8 B4 74 51 A8 B3 74 52 A9 B4 TABLE B FB211 PACK FUSE USER ASSIGNMENT FOR OFFICES EQUIPPED WITH MIXED TSI TYP...

Page 195: ...T FOR OFFICES EQUIPPED WITH CRTSIs ONLY TSI 02 03 output in each bay connected to an NE 01489 31 assembly mounted at location 170 280 This assembly then connects to a sync converter circuit NS 01489 0...

Page 196: ...IB SD 4A083 01 RST TMSP a CONTR b RST SCLK a CONTR b RMV SCLK a CONTR c RMV TMSP a CONTR b RMV VIF a CONTR b RMV DT a CONTR b RMV DIF a CONTR b RMV PUC a CONTR b RMV EST a CONTR b RMV TSI a CONTR b RM...

Page 197: ...t oscillator manual adjustment unit ED4A178 to J20 of 39B 4 Ensure oscillator manual adjustment unit power LED lights 6 See NOTE 1 Adjust oscillator manual adjustment unit thumbwheels ADJUSTMENT UNIT...

Page 198: ...undred steps between LEDs LED lights FREQ HI LED lighted 7 Is No FREQ LED lights 9 At oscillator manual adjustment unit increase 10 At oscillator manual adjustment unit decrease 12 At oscillator manua...

Page 199: ...AND Page 4 reading and depress LOAD pushbutton LOAD pushbutton thumbwheel up one digit up one digit and depress 16 Increase frequency word by 18 Increase frequency word by after each step decrease af...

Page 200: ...crease step increase 22 Decrease frequency word by 23 Increase frequency word by 25 Load new frequency word into 39B oscillator with frequency word recorded in Step 24 plus one half difference of valu...

Page 201: ...illator a chain adjusted 29 On 39B oscillator position 28 Connect NCSU cable to J20 of STROBE switch to ENABLE 27 Disconnect oscillator manual adjustment unit connector from J20 of 39B oscillator RST...

Page 202: ...METER 1 At network clock frame observe PHASE LOCK OVEN TEMP meter chain 0 1 2 or 3 2 Does meter indicate 2 divisions or more 3 Repeat for all chains No Yes from Step 1 TAP 129 234 151 013 513 Issue 8...

Page 203: ...k frame depress and hold 0 1 2 or 3 MSO switch chain reset arms operate LOCK OVEN TEMP meter METER and PHASE 5 Repeat 4 Do meter from Step 1 TEST METER SOLENOID OPERATE MSO LAMP PHASE METER RESET AND...

Page 204: ...itch to normal position chain under test switch 7 Depress ROS OFF 8 Replace meter for chain OFF NORM and OS lamps light OS lamps go off OFF NORM and TEST METER SOLENOID OPERATE MSO LAMP PHASE METER RE...

Page 205: ...screws holding 4 At front of frame remove four flathead screws and 5 At rear of frame remove four screws holding mounting capacitor cover 7 At item being replaced remove and tag leads 6 At front of fr...

Page 206: ...new switch lamp assembly in 12 With mounting bracket held in place panhead screws holding rear of 14 At rear of frame install six control cover and four flathead 13 At front of frame install NCLK 15...

Page 207: ...and rear network clock control chain covers removed AND 7 Place solder drop cloth close to bottom of network clock control 8 Tag and remove leads from defective meter soldering iron 9 Remove four met...

Page 208: ...2 3 corresponding positions on new soldering iron and remove tags meter using grounded tip 17 If PHASE LOCK OVEN TEMP meter PHASE OVEN PHASE OVEN PHASE OVEN PHASE OVEN switch for 2 seconds 16 Depress...

Page 209: ...tch to lights ROS OFF NORM lamp TEST OSCILLATOR OUT OF SERVICE LAMP lights ACK lamp lights momentarily OS lamp 4 On clock chain power switch rotate ROS OFF switch counterclockwise to normal position O...

Page 210: ...ing 7 At the next time announcement 1 See CAUTION 1 aa hour of night SET CLK TIME aa time announced 1 second from minute announced plus 1 and 00 seconds bb minute announced plus 1 instant tone is hear...

Page 211: ...epress 8 Is Page 3 1 Is mate clock chain in service 2 At power switch rotate 3 Depress ROS OFF switch ROS OFF switch No Yes to ROS TABLE A Page 2 lamps light OS and OFF NORM PWR OFF lamp lights lights...

Page 212: ...8 Connect FREQ CONTROL INPUT P21 17 Remove 24 volt fuse for the TABLE B FUSES 0B0A 0B0B 1B0A 1B0B mounting plate to frame and retain rubber washers holes on bottom of new OSCILLATOR 10 Remove screws h...

Page 213: ...evel of technical support for assistance from Step 5 diagnostic phase 1 2 or 3 suspect clock chain diagnostic 4 21 Is failed 22 Isolate 23 See NOTE 1 24 Did 26 Contact next 25 Repeat NOTE 1 Ensure clo...

Page 214: ...D DISPLAY 1 14 1 Using thumbwheels on oscillator LED goes off AND Page 2 CHECK FULL FREQUENCY RANGE OF 39B OSCILLATOR 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1...

Page 215: ...ual in next frequency word listed in TABLE A adjustment unit set been checked Repeat from Step 2 Page 1 7 Does oscillator have full frequency range problem Yes Yes No No in TABLE A Page 1 CHECK FULL F...

Page 216: ...r removed from oscillator with positive 4 Depress ROS OFF switch to 5 Remove 24V fuse for 24V terminals C and B of power probe on terminal C between 22 and 26 volts power problem SD 4A014 02 No Yes Ye...

Page 217: ...ce or equivalent Yes No No 5 Check defective lamps disregard LEDs using GE387 TEST LAMPS ON POWER SWITCH 1 At power switch 2 Depress TEST pushbutton momentarily and observe lamps power switch SD 4A014...

Page 218: ...ved in Step 3 PWR OFF lamp goes off REPLACE POWER SWITCH wiring to switch terminals 5 See NOTE 2 Tag and remove frame normal position NOTE 3 1 See NOTE 1 At power switch rotate ROS OFF switch to ROS 2...

Page 219: ...ripheral bus unit System clock and bus controller 066 04 066 68 060 55 056 66 160 55 062 058 054 162 158 007 20 007 51 009 51 009 51 107 20 107 51 109 51 FUSE BLOCK 166 04 166 68 FUSES TABLE A LOCATIO...

Page 220: ...cable connectors End of procedure switch NOTE Bit 12 of word A indicates controller status If 0 use word C in CONTR 0 If 1 use word C in CONTR 1 2 Identify oscillator using bits 0 1 and 2 of word C 3...

Page 221: ...et STROBE switch to ENABLE 6 At all 39B oscillators set STROBE switch to DISABLE service 48 hours clockwise 1 See NOTE 1 At TTY enter 3 At TTY enter RST SCLK 0 NCSU 0 5 At TTY enter RMV SCLK 0 NCSU 0...

Page 222: ...Access PK for failing bit 11 Find lead interconnection section for this symbol 12 Using terminal and lead name noted in Step 8 find corresponding SD lead name 7 In adjacent SH LOC column use location...

Page 223: ...ock chain connect relay associated with clock chain removed from service and frame 4 Connect channel 1 scope probe to terminal 218 of FB214 pack associated with clock chain removed from removed from s...

Page 224: ...oscillator manual LED display 11 Record LED display on or off condition on front of oscillator 12 Record thumbwheel reading at oscillator manual 16 Set thumbwheels to reading recorded in Step 12 enter...

Page 225: ...8 volts and 2 0 volts peak to peak No 18 Recheck 39B 19 Is waveform of chain being tested adjust potentiometer to measure 1 9 volts peak to adjustment cover 20 Remove level adjustment with clock chai...

Page 226: ...ipage DETERMINE TIMING REFERENCE EQUIPAGE Layout WORD 13 BIT WORD 13 23 NA 22 21 DS1B 20 19 18 17 BSRF DS1A VER UTYPE SCLK 0 adjusted is removed from service FIG 1 TABLE A End of procedure 1 Ensure ch...

Page 227: ...internal trigger 8 Set horizontal time base to 0 5 ms 3 Select one oscilloscope Scope would be 50 mv 0 5 volts division typical set to full bandwidth less ground leads X10 probes with 4 inch or switc...

Page 228: ...ready to use scope connect both channel 1 probes to clock chain TABLE A Page 3 Page 3 AND AND AND in Step 2 Page 1 to channel 1 CALIBRATE SCOPE 12 Ensure volts division switch is set to 0 5 volts div...

Page 229: ...2 of selected scope 13 for channel 2 of selected 23 Repeat Steps 4 Page 1 through proceeding with measurements NOTE 2 signal level changes some ground impedance is suspected and problem must be corre...

Page 230: ...e channel 2 of scope selected first or third with probe from other scope by calibration source chosen in Step 15 Page 2 34 See NOTE 2 Refer to FIG 3 and 4 for correct reading of 16 MHz clock signal Pa...

Page 231: ...67 4 At rear of timing reference 5v of scope to cliplead from 2 048 MHz signal 2 At NCSU 1A power switch 1 Is BSRF to Step 2 Step 4 7 See channel 1 scope FG65 FG72 FG76 scope 8 SYNC channel 1 67 219B...

Page 232: ...s BSRF 19 See NOTE 3 18 Call located at 050 63 and 050 59 FG61 and FG62 scope to 4 kHz signal connected FG64 FG65 FG72 FG76 050 65 050 67 050 25 050 27 12 At rear of NCSU connect channel 1 scope probe...

Page 233: ...TABLE D On OMAU VERIFY LED goes off CHANNEL 1 CHANNEL 2 channel 2 21 At scope set CRT display to CHOP mode 24 Set oscillator manual adjustment unit thumbwheel to 2000 and enter by depressing LOAD pus...

Page 234: ...Record LEDs display on off conditions at front of oscillator 29 Record thumbwheel reading at oscillator manual 27 See NOTE 4 Make additional AND Page 5 adjustment unit from oscillator NOTE 4 word ente...

Page 235: ...from 31 Is oscillator 32 Reconnect adjustment unit 37 At 1A power switch 38 Install NCSU circuit 39 At 1A power switch 35 Remove 36 Is BSRF the oscillator manual LED display 33 Set thumbwheels to val...

Page 236: ...STMENT UNIT FROM OSCILLATOR 1 On oscillator position ENABLE DISABLE switch to DISABLE 4 On oscillator position ENABLE DISABLE switch to ENABLE 3 Connect NCSU cable J20 to oscillator End of procedure c...

Page 237: ...ition 1 Ensure clock chain is OOS and 4 See NOTE 1 Connect oscillator manual adjustment unit oscillator thumbwheels to frequency word FFFF 5 Verify oscillator manual adjustment 2 On oscillator positio...

Page 238: ...e a 0 if alternate No Yes SWITCH NCSU REFERENCE indicated in Step 2 SW SCLK0 REF a RUN pushbutton 4 Send messages RMV SCLK 0 NCSU 0 RST SCLK 0 NCSU 0 a 1 if status is normal system alarms panel depres...

Page 239: ...igate from Step 2 Yes No CHECK FOR OPEN DIODE IN FB211 CIRCUIT PACK 6 Repeat 2 Does TTY printout indicate BAY 1 BAY 0 first BAY O fuse Yes 5 Install fuse just removed 4 Remove fuse that caused pack as...

Page 240: ...B3 B4 B5 B6 B7 B8 A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 B4 B5 B6 B7 B8 noted in Step 4 CHECK FOR SHORTED DIODES IN FB211 CIRCUIT PACK 1 See NOTES 1 and 2 Remove all BAY 0 REMOVAL SEQUENCE 8 Are any fus...

Page 241: ...er number having pack to be replaced a TSI B frame associated with be removed circuit pack to 1 Is clock 5 Enter VER UTYPE TSI a 2 Enter 6 Enter VER UTYPE TSI b VER UTYPE TSI a a member number Step 11...

Page 242: ...and generic determine which translation AND bits 18 through 22 of word 5 to input message in Step 2 or 5 Page 1 and translation determine EST frame member number Yes No No Yes 10 Convert to octal Page...

Page 243: ...RECEIVING Member number DT VIF DIF PUC TSI TYPE WORD 23 22 21 20 19 18 17 16 TSI A TSI B Clock 0 Bit 0 10 Clock 1 Bit 11 21 Clock A Bit 0 10 Clock B Bit 11 21 Clock C Bit 0 10 Clock D Bit 11 21 Clock...

Page 244: ...At TTY enter At TTY enter a out of service before restoring unconditionally is powered up chains 2 and 3 NOTES 0 and 1 are paired and clock are paired 2 Clock chains 3 Ensure clock chain 1 39B Oscill...

Page 245: ...WITCH REMOVE 39B OSCILLATOR PECC OR NESAC MUST BE CONTACTED BEFORE OSC IS RETURNED FOR REPAIR OTHER EXPLAIN BENCH TEST IN FRAME PRESERVICE CHECK IN FRAME SERVICE FAILURE 24V CURRENT DRAIN SKIP INITIAL...

Page 246: ...me REMOVE 39B OSCILLATOR remove power ROS OFF switch is in ROS position At oscillator being removed TABLE B oscillator being removed 10 Depress ROS OFF switch to 12 Disconnect RF OUTPUT connector P13...

Page 247: ...r available for replacement No RST NCLK 0 CHAIN a UCL RMV NCLK 0 OSC a a oscillator removed 18 Is spare 21 At TTY enter 22 At TTY enter 24 At TTY enter RST SCLK 0 NCSU 0 23 At all remaining 39B oscill...

Page 248: ...ciated with 3 Remove probe from 5 Connect scope probe to terminal 018 of switch associated with clock chain removed from 4 See NOTE 3 At power service TABLE A depress ON pushbutton PWR OFF lamp exting...

Page 249: ...illator being switch to ENABLE 9 Check 39B oscillator frequency well seated 10 Disconnect Oscillator Manual Adjustment Unit from 7 Remove scope probe from pack 13 At TTY enter RST SCLK 0 NCSU 0 14 At...

Page 250: ...CAUTION 1 Screwdriver shank must be insulated 21 Rotate lamps extinguish ROS switch to normal position OS and OFF NORM between 1 8 volts level adjustment cover scope probe to terminal associated with...

Page 251: ...error ATP CHECK 39B OSCILLATOR 23 Is 24 Clear 25 Has procedure 26 Clear DGN SCLK 0 NCSU 0 NCLK 0 CHAIN a a chain associated checked with oscillator being 22 At TTY enter technical assistance next lev...

Page 252: ...ve 35 Contact next 33 Remove probe 34 Is 36 Correct adjustment cover NOTE 5 and replace level oscillator adjust potentiometer to measure from Step 3 front left side of 39B adjustment cover from establ...

Page 253: ...13 between 0 87 volt and 0 97 volt to 0 92 volt TABLE A Page 1 Step 5 Page 1 from Step 5 Page 1 Page 8 No adjustment cover from front left side of 39B oscillator 39 Remove probe from 40 Is waveform 42...

Page 254: ...k and replace level adjustment cover replace FB687 pack oscillator level adjustment cover adjust oscillator to of FB687 pack from terminal 018 volt peak to peak of FB214 pack it to terminal 201 FB214...

Page 255: ...tor P18 and P19 from oscillator converter TABLE B 61 On back of fuse 62 Is 63 Clear 64 Depress ROS OFF switch 66 Disconnect POWER connectors 67 Replace fuse removed 69 Is 70 Clear in Step 65 panel mea...

Page 256: ...ct POWER 73 Replace fuse removed in Step 71 removed in Step 65 71 Remove 24V fuse 74 Has procedure been repeated from Step 4 once 75 Repeat from Step 4 Page 1 higher level of technical support for ass...

Page 257: ...ting mechanical zero of the phase meter See NOTE 1 3 Set OMAU thumbwheels to 2000 4 Depress LOAD depress ON switch PWR OFF 2 At clock chain power switch with ROS OFF switch in ROS position lamp exting...

Page 258: ...Is OMAU 13 Is oscillator 14 Repeat from 15 Record LOAD button MSO pushbutton Yes Yes zero for oscillator 5 Is oscillator 9 Repeat from Step 4 Page 1 increasing OMAU thumbwheel setting by hex 0010 unti...

Page 259: ...ad that FREQ HI thumbwheel setting by hex 0010 and depress LOAD button Page 4 CHECK 39B OSCILLATOR FREQUENCY HI LOW BITS thumbwheel setting by hex 0010 and depress LOAD button FREQ HI LED 16 Increase...

Page 260: ...W BITS Yes Page 5 OMAU thumbwheel setting by hex 0010 button and depress LOAD No Step 20 increasing division left of zero No that FREQ LOW FREQ LOW LED lit 22 Is OMAU 23 Is oscillator 24 Repeat from 2...

Page 261: ...HI and or OMAU thumbwheel setting by hex 0010 button No Yes and depress LOAD off No oscillator at zero Yes Step 25 decreasing FREQ LOW bit FREQ LOW LED that FREQ LOW 27 Is OMAU 28 Is 29 Repeat from 3...

Page 262: ...chain removed from note position of ROS OFF FB214 pack associated with switch service TABLE A 3 Rotate ROS OFF switch to ROS CLOCK 0 1 2 3 LOCATION 070 34 070 37 170 34 170 37 FB687 CHAIN TABLE A PWR...

Page 263: ...probe from pack and switch to position noted in Step 2 Page 1 No Yes replaced twice pack been pack TABLE A and repeat from Step 4 Page 1 restore ROS OFF 13 At power switch TABLE A depress ROS OFF swi...

Page 264: ...epress No Yes Page 2 ROS OFF switch PWR OFF lamp lights TABLE A POWER SWITCH CLOCK CHAIN FRAME LOCATION 066 03 066 68 166 03 166 68 0 1 2 3 7 Analyze F Level interrupt using Output Message Analysis Ye...

Page 265: ...s 2000 RF OUTPUT is enabled mounting plate to frame frame upright to DRO TABLE B CLOCK CHAIN 0 1 2 3 OSCILLATOR LOCATION 033 21 033 56 133 21 133 56 DC DD DC DD 9 Install and tighten screws with 12 Co...

Page 266: ...ssistance from Step 5 INSTALL DISCIPLINED RUDIDIUM OSCILLATOR 18 See NOTE 1 19 Did 21 Contact next 20 Repeat diagnostic phase 1 2 or 3 suspect clock chain diagnostic 4 16 Is failed 17 Isolate NOTE 1 E...

Page 267: ...TS OF DISCIPLINED OMAU VERIFY LED goes off 2 0 0 0 2 0 0 0 1 Using thumbwheels on oscillator RUBIDIUM OSCILLATOR TABLE A correspond to frequency word set in Step 1 and loaded in manual adjustment unit...

Page 268: ...CIPLINED frequency words Yes No 5 Have all 6 Using thumbwheels on oscillator manual in next frequency word listed in TABLE A adjustment unit set been checked Repeat from Step 2 Page 1 in TABLE A Page...

Page 269: ...k chain connect relay associated with clock chain 4 Connect channel 1 scope probe to terminal 218 of FB214 pack associated unit thumbwheels to 2000 and 2 Enter RMV NCLK 0 CHAIN a NOTE 1 replacement os...

Page 270: ...nto oscillator by depressing LOAD pushbutton and repeat from Step 13 AND ALIGN DISCIPLINED RUBIDIUM OSCILLATOR USING OPEN LOOP METHOD hex display 13 Disconnect oscillator manual adjustment unit from o...

Page 271: ...48 MHz on channel 1 of Page 2 USING EXTERNAL REFERENCE ALIGN DISCIPLINED RUBIDIUM OSCILLATOR FREQUENCY the regular NCSU circuit packs listed in TABLE A are installed Yes No PACK TABLE A 048 27 048 25...

Page 272: ...l 65 OGDT to terminal 65 000T 9 Ensure NCSU circuit packs listed 16 Is 4 kHz present on Page 3 Page 3 AND ALIGN DISCIPLINED RUBIDIUM OSCILLATOR FREQUENCY USING EXTERNAL REFERENCE listed in TABLE C to...

Page 273: ...5 Set horizontal controls for 21 At scope set CRT display probe to 8 kHz framing pulse at terminal 210 of FA626 pack TABLE D to CHOP mode NCSU REFERENCE 26 Repeat from thumbwheel settings to cause wa...

Page 274: ...llator MAXIMUM ALLOWABLE DRIFT IN ALIGN DISCIPLINED RUBIDIUM OSCILLATOR FREQUENCY USING EXTERNAL REFERENCE 27 See NOTE 6 Make additional 15 MINUTES word entered into is not between 0800 replacement os...

Page 275: ...SCIPLINED RUBIDIUM OSCILLATOR FREQUENCY USING EXTERNAL REFERENCE same as noted 34 Call 4ESAC for assistance No Yes No 31 Is oscillator 32 Reconnect adjustment unit oscillator manual LED display 33 Set...

Page 276: ...set ENABLE DISABLE 3 See NOTE 1 4 See NOTE 2 RMV SCLK 0 NCSU 0 1 At TTY enter At TTY enter Page 2 Page 2 ENABLE DISABLE SWITCH Oscillator DISABLE unconditionally chains 2 and 3 NOTES 0 and 1 are paire...

Page 277: ...or from network clock frame mounting plate to frame being removed TABLE B oscillator being removed REMOVE DRO OSCILLATOR P21 and POWER INPUT P19 connectors Page 3 remove power ROS OFF switch is in ROS...

Page 278: ...r removed 18 Is spare DRO oscillator 19 Install 48V fuse removed in 21 At TTY enter 22 At TTY enter 24 At TTY enter RST SCLK 0 NCSU 0 Step 11 Page 2 TABLE B Page 2 23 At all remaining DRO oscillators...

Page 279: ...ed with 3 Remove probe from 5 Connect scope probe to terminal 018 of switch associated with 4 See NOTE 3 At power service TABLE A depress ON pushbutton PWR OFF lamp extinguishes CHECK DISCIPLINED RUBI...

Page 280: ...at NCSU are CHECK DISCIPLINED RUBIDIUM OSCILLATOR soft to hard BLM on SCLK 0 NCSU 0 10 At TTY enter RST SCLK 0 NCSU 0 9 On all DRO oscillators ensure ENABLE DISABLE switch is set to ENABLE RST NCLK 0...

Page 281: ...r being 18 Has procedure 19 Clear 16 Is 17 Clear DGN SCLK 0 NCSU 0 NCLK 0 CHAIN a a chain associated checked 15 At TTY enter Page 2 indicate 13 Did report message in Step 12 14 Rotate ROS switch to no...

Page 282: ...LLATOR DRO oscillator RF OUTPUT 25 Remove 26 Remove probe 27 Is 28 Contact next 29 Correct oscillator adjust potentiometer to measure from Step 3 adjustment cover from established signal level Yes No...

Page 283: ...1 Step 5 Page 1 from Step 5 Page 1 No adjustment cover from front RF OUTPUT measure 0 92 volt peak cable problem and Step 5 Page 1 between 1 4 volts potentiometer to measure 1 9 volts peak to peak osc...

Page 284: ...CHECK DISCIPLINED RUBIDIUM OSCILLATOR volt peak to peak measure 0 92V peak 48 Remove 49 See TABLE A 50 Is 51 Remove DRO 52 Could Page 7 Page 7 53 See TABLE A waveform be adjusted to 1 9 volts peak to...

Page 285: ...C and B of power connector output and frame voltage between fuse TABLE B connector P19 from oscillator being replaced panel measure DC 54 On back of fuse 58 Remove 48 volt fuse 60 Replace fuse removed...

Page 286: ...rt for assistance Yes AND from Step 4 Page 1 connector P19 65 Reconnect POWER 67 Has procedure been repeated from Step 4 once No 68 Repeat to oscillator 64 Remove 48 volt fuse removed in Step 58 Page...

Page 287: ...emoved from note position of ROS OFF FB214 pack associated with CLOCK 0 1 2 3 LOCATION 070 34 070 37 170 34 170 37 FB687 CHAIN TABLE A PWR SW 2 At power switch TABLE A switch service TABLE A 3 Rotate...

Page 288: ...switch TABLE A depress ROS OFF switch to power oscillator 14 Check DRO Oscillator ENABLE DISABLE SWITCH potentiometer to measure 9 Replace level adjustment 8 Adjust level adjustment 1 9 volts peak to...

Page 289: ...ntil status 1 Operate STATUS OFF RESET LAMP STATUS OFF RESET LAMP SWITCH indicator test begins 2 See NOTE 1 Verify that all status LEDs and all HEX display segments light except for TOS INHIBIT and tw...

Page 290: ...round TABLE A 2 Is 4 Depress ROS OFF switch to remove power from 5 Remove 48 volt fuse TABLE B connector P19 from oscillator being replaced and B of power connector removed from oscillator terminal C...

Page 291: ...r assistance No Yes Yes 1 See CAUTION 1 Calibrate and scope probe to pin 091 2 At terminal block 052 03 9 Contact for symmetry and amplitude CAUTION 1 calibration may affect service NOTES 1 Symmetry m...

Page 292: ...TAP 140 TAP 142 TAP 143 TAP 144 ISD 115 ISD 116 ISD 117 ISD 131 TAD 101 TAP 145 TAP 146 TAP 147 TAP 148 NTP 010 NTP 011 NTP 012 ISD 149 ISD 150 TAP 151 CKL 891 TNG 893 DLP 544 DLP 545 DLP 546 DLP 547...

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