Toshiba Strata Dk24, Dk56, Dk96 Instruction Manual
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STRATADKFAULTFINDING SECTION 200-096-500 FEBRUARY1991 7.10 Ohmmeter Test 7.11 The continuity of the cable run between the KSU and the electronic telephone is checked with an ohmmeter as follows: 1) Disconnect the electronic telephone. 2) At the MDF, remove the bridging clips. 3) Using an ohmmeter, measure the resistance between all combinations of the four wires at the modular block. All measurements should TABLEE STATION CABLECONTINUITY CHECKUSINGVOLTMETER *Nominal voltage-within the limits of -26.3 N -27.8 VDC while under AC power. exceed 1 M ohm (Refer to Table H on page 27 for a PDKU). I ‘\, ./ . ,I’ 4) At the MDF, place shorting jumper wires be- tween the T and R of pair #I (green-red), the T and R of pair #2 (black-yellow) and the T and R of pair #3 (blue-white). 5) At the modular block, measure the resistance between all wire combinations. The proper readings are shown in Table F (Refer to Table H on page 27 for PDKU). I TABLEF STATION CABLECONTINUITY CHECKUSINGOHMMETER NOTES: 1. This is maximum allowable reading. 2. The green-red, black-yellow and white- blue measurements should be within 10% of each other. -4-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 1 FAULT CLASSIFICATION Please read the maintenance information before proceeding. Start here to clear faults in STRATA DK Systems. __- _... - _____- y due to erroneous programming. 1 YES Check circuit breakers and power indicators. I YES To n A r--IT- NOTE: Any time a flowchart refers to PCTU, the information applies to I PCTUI, PCTU2, PCTU3 and/or PCTUSl. -5-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 From CHART NO. 1 FAULT CLASSIFICATION (cont.) INT aae 14 From Maintenance/ Fault should have been classified. Return to Page 5. To -6-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 2 POWER FAULTS From ‘rYES Power down and lightly press all circuit breakers. Remove all PCBs and power down and press breakers. Y YES Refer to the Voltage Distribution chart and install PCBs one at a time until faulty PCB is found. Tag the defective unit(s) and return for repair. A Call Service Center for assistance. YES -7-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 3 STATION FAULTS Fault Classification fault. ’ Flowchart? I Fromm \/ [Pages 15\-&YES NO “;/ Replace the it an OCA electronic telephone and line cord. Replace HVSWHVSI in electronic telephone or DVSU in digital telephone. . Tag the defective unit(s) and return for repair. q-z-) NOTE: The maximum distance between ” , the electronic telephone and KSU .’ is 1,000 ft. using 24 AWG cable. To -B-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 3 STATION FAULTS (cont.) Replace the EOCU on the all stations on PEKU, appropriate PEKU or PESU, if used, or replace the PDKU. ‘ES Replace the PCTU, initialize the system and reprogram as required. defective unit(s) and return for Call the Service Center for assistance. -9-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 4 KSU FAULTS Fault Classification Go to Page 5 to classify fault. at the electronic Remove all PCBs from the KSU except: PEKU, PCTU, PESU, or PDKU. accessed by ports PESU, or PDKU, / ~~ intercom be l Reinstall all PCBs, I one at a time. Tag the l If trouble occurs, --) defective unit(s) ar Id replace suspected return for repair. PCB. (r-i END -lO-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 5 CO LINE FAULTS Fault Classification Go to Page 5 to classify fault. Call the Service Center for assistance. Reprogram as required. Replace appropriate PCOU. Verify operation of that CO/PBX line. Replace the appropriate m,-.,-., , -- 3. I Verify continuity of wiring between the PCOU and the connecting block. Replace the wiring. cc; END .- From Tag the defective unit(s) and return for repair. END I-- , -ll-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 5 CO LINE FAULTS (cont.) Remove all PCBs from the KSU except: * PCTU . PEKU (PESU) (PDKU) NOTES: 1. Perform the initialization Reinstall PCBs one at a time. If troubles occur, replace suspected PCB. l-----i Tag the defective unit(s) and return for repair. I I 23 END -12-
STRATA DK FAULT FINDING SECTION 200-096-500 FEBRUARY 1991 CHART NO. 5 CO LINE FAULTS (cont.) Replace all PCBs, Call the Service Center / for assistance. 1 (’ END -13-