Toshiba Strata Xii, Strata Xx General Description Manual
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Page 151
FAULT FINDING SECTION 100-020-500 JANUARY 1984 CHART NO. 1 From FAULT CLASSIFICATION (cont’d) 1 NO MOH, BGM. Page 1 NO J. NO 1 NO NO l-----l Fault should have been classified. Return to Page 7. -8-
Page 152
From POWER FAULTS Start here to __________ CHART NO. 2 clear power faults. here from the NO Fault Classification L 1 YES Go to Page 7 to classify fault. T YES l MPRU switch OFF. l Operate appropriate circuit breakers on the MPRU. l MPRU switch ON. FAULT FINDING SECTION 100-020-500 JANUARY 1984 NOTES: 7. See Tab/e A for checking procedure. 2. Tab/e C end Figure 2 show the relationship between circuit --____ breakers and station numbers. Verify that power is present at et least...
Page 153
FAULT FINDING SECTION 100-020-500 JANUARY 1984 From CHART NO. 2 POWER FAULTS (cont’d) NO Replace the MPRU. l ReInstall the PCEs, one at a trme. . Take note of failure. If it occurs. and replace that PCB. l Be sure to switch power OFF before a PCB 1s inserted. I From Replace the Replace the power MPRU. SUPPlY. From P2 0 Page 9 t I l Check power supply wiring, fuses and AC source. l Replace or repair, f :_ ._ YES 4 + Tag the defective unItis) and return for repair....
Page 154
FAULT FINDING SECTION 100-020-500 - JANUARY 1984 Start here to clear station faults. CHART NO. 3 STATION FAULTS From NO * Go to Page 7 to classify fault. YES Replace the EKT and tailcord. thru the same Reset the circuit breaker. 1 I . . To -ll-
Page 155
FAULT FINDING SECTION 100-020-500 JANUARY 1984 CHART NO. 3 STATION FAULTS (cont’d) YES statlons served Replace the appropriate / $3 / K2 stations served Replace the appropriate YES I Tag the defective unit(s) and return To n YES I- Replace the MCAUIAMMU. (refer to Paragraph 05.01) This 1 P?lnr= Page 13r- NOTES: 1. Perform fhe initialize sequence before proceeding. 2. Reprogram as required. -12- YES To 6 . CO3 -- -_ Page 15
Page 156
CHART NO. 4 MKSU FAULTS here from the Go to Page 7 fault. To ---___J_ 1 YES Remove all PC& from the MKSU except: l MCAU/AMMU l MCBU #1 l MlNU l MPRU l MXPU #l l MSTU #l I procedure. L NOTES: 1. Perform the initialize sequence when the MCAlJ/ AMMU is replaced. 2. Reprogram as required. FAULT FINDING SECTION 100-020-500 - JANUARY 1984 Replace all PCBs in above list with a known good set. (refer to Paragraph 05.01) l Reinstall all PCBs, be accessed by one at a time. If trouble...
Page 157
. FAULT FINDING SECTION 100-020-500 JANUARY 1984 CHART NO. 5 CO LINE FAULTS Yggig-_____x , / Did lines on the same MCOUWPLU)? Replace the YES f appropriate MCOU (or MPLU) PCB. transmission NO YES YES l Refer to Table D. l Replace all MXPUs associated with affected line, one t YES Tag the defective unit(s) / and return for repair. (i_! END Before proceeding verify: l Correct CO/PBX line operation at the connecting block. l Wiring between the MCOU and connecting block. l...
Page 158
FAULT FINDING SECTION 100-020-500 - JANUARY 1984 CHART NO. 5 CO LINE FAULTS (cont’d) From /7 MCAUIAMMU. Paragraph 05.01) except: l MCAUIAMMU l MINU l MCBU #l l MXPU #l . MPRU .MSTU #l l MCOU(MPLU)#l NO l Reinctall PCBs. . _ _ __ one at i . If trn,,hlcs nt-r,,r< Tag the defective unit(s) * and return for repair. + END - , -15-
Page 159
FAULT FINDING SECTION 100-020-500 JANUARY 1984 CHART NO. 5 CO LINE FAULTS (cont’d) 1, Replace all PCBs. one at a time, 1. Perform initialize in the order listed sequence when above, until the ~~~~~~~~~~ MCAlJ/AMMlJ fault is cleared (refer to 2. Reprogram as Paragraph 05.01). l Reinstall remaining YES PCBs, one at a ~ time. l If trouble occurs, replace suspected PCB. Replace all PCBs in above list with a known good set. (refer to Paragraph 05.01) ,,,,,,,,. 2. Reprogram as...
Page 160
CHART NO. 6 INTERCOM FAULTS here from the Fault Classification NO Go to Page 7 + to classify fault. NO transmission 3”” Replace the appropriate MSTU or MXPU according to Table D. FAULT FINDING SECTION 100-020-500 JANUARY 1984 YES Tag the + defective unit(s) and return for repair. J END Page 18 u -17-