Toshiba Strata Xii, Strata Xx General Description Manual

							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-  
						

							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 one station in each 
group. 
l MPRU switch OFF. 
. Operate all circuit 
breakers on rhe 
MPRU. 
l MPRU switch ON. 
1 
YES 
l MPRU switch OFF. l Remove all PCBs 
except the MPRU. 
l Operate all circuit 
breakers. 
l MPRU switch ON. 
To 
output at power 
supply terminals YES Verify cable 
connectors between 
* power supply and 
MPRU. 
I  
						

							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. Call the Service 
-lO-  
						

							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-  
						

							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  
						

							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 occurs, 
replace suspected 
PCB.  Replace all PCBs, 
one at a time, 
in the order listed 
above, until the 
fault is cleared. YES 
t 
I 
*Replace original 
PCBs. one at a 
time. 
*If trouble occurs, 
replace suspected 
PCB. 
J 
NOTES: 
1. Perform the 
initialize 
sequence 
before 
proceeding. 
2. Reprogram 
as required. 
-13-  
						

							. 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 System programming. 
-14-  
						

							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-  
						

							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 
___________- 
YES 
l Replace original 
PCBs, one at a 
time. 
l If trouble occurs, 
replace suspected 
PCB. Tag the 
defective unit(s) 
and return 
for repair. 
A END 
-16-  
						

							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-