Toshiba Strata S Electronic Key Telephone System Installation And Maintenance Manual

FAULT FINDING 
SECTION 190-903-500 
JULY1994 j- CHART NO. 1 
FAULT CLASSIFICATION 
Please read 
General Mainte- 
nance Information 
before proceeding. 
‘Start here to 
clear faults 
in 
e- s. 
pmgmmming and 
external equipment 
Check circuit 
i 
breakers and 
power indicators. 
1 YES  

CHART NO. 1 
FAULT CLASSIFICATION (can’t) 
Fautt should ban 
been clenttted. 
Return to Pege 4. 
FAULT FINDING 
SECTION 100403400 
JULY 1994 
-5-  

FAULT FINDING 
SECTION 199-993-599 
dULY 1994 
From 
CHART NO. 2 
POWER FAULTS 
here from the 
Fault Classification Go to Page 4 
to classify 
fault. 
YES 
T YES 
NO 
l KSU switch off 
T 
l Operate the 24V 
circuit breaker 
on the KSU 
l KSU switch on. 
Y NO 
l KSU switch off. 
. Operate the 24V 
circuit breaker 
on the KSU. 
l KSU switch on. END 
Ai? 
l Replace MKSU. - l Tag defective 
MKSU and return 
for repair. 
input to the KSU 
23.2*28.2\1? 
the KSU 232 M I 
l KSU witch off. 
. Remove PCBs 
except...

v.. 
FAULT FINDING 
SECTION 1W 
JULY 1984 
CHART NO. 2 
POWER FAULTS (can’t) 
From 
Replace the 
MKSU. 
I YES 
t 
l Reinstall PCBs, 
one at a time. 
l Take note of 
failure if it 
occurs and mplace 
that PCB. 
l Besumto 
switch power 
off bafore a 
PCB is insartad. 
Tag dafectiva 
PCB(s) and return 
for repair. 
23 END FrOm 
0 
Paz6 
l Check power 
I  I as necassaw.  as necassaw. 
Tag defective 
MKSU and return 
for repair. 
l Rqhce poumf 
WPW. 
. Trg defective 
unit and rwturn 
for repairs. 
-7-  

FAULT FINDING 
SECTION 100-003-500 
-JULY 1994 - 
CHART NO. 3 
STATION FAULTS 
From 
m 
Change the EKT. 
NO 
Verify station 
cable per Tables 
s 
-8-  

FAULT FINDING 
SECTION lDO-D03-5DO 
JULY 1994 
CHART NO. 4 
MKSU FAULTS 
From 
KSU 
t 
Q 
PW4. 
I 
I Remow: ACOU. I - 
I 
AEFU, AMOU, 
APFU. 
I 
l Reinnrll all PC&, ona rt 
0 time. 
l If trouble occurs, 
replace suspected 
PCS. 
6 
I 
, 
Tog defectiw 
MKSU and 
return for 
repair. 
-9-  

FAULT FINDING 
SECTION 100-003-500 
JULY 1994 
CHART NO. 5 
CO LINE FAULTS 
From 
here from the Go to Page 4 
to classifv 
fault. 
Verify before 
1 -----  proceeding: 
l Correct CO/PBX 
line operation 
at the connecting 
block. 
l Wiring between 
ACOU and 
connecting block.  Change the 
ACOU. 
NO 
Replace the 
MKSU. 
Tag defective 
MKSU and 
return for repair. Tag defective 
PC6 and return 
23 END 
,. - 
-lO-  

, w.. 
CHART NO: 6 
MOH FAULTS 
Go to Page 4 
to classify 
fault. 
l Verify external 
equipment. 
l Verify position of 
SW3 on MMAU. 
Tag defective 
PC8 and return 
for rep&. 
I NO 
r “&ZF 
assistmlce. 
CL7 END 
FAULT FINDING 
SECTION 199-903-990 
JULY 1994 
-ll-  

FAULT FINDING 
SECTION 100-003-500 
JULY 1994 - 
CHART NO. 7 
PAGE FAULTS 
Go to Page 4 
NOTE: 
Programming is 
nor effective 
until KSU power 
switch is 
cyckd off/on with KSU 
SET LED off. 
1 1 
l Verify external 
equipment. 
l Verify programming l Verify position of 
SW2 on MMAU. 
Replace the 
AEPU. 
Call the Service 
Center for 
assistance. 
YES 
r’ Tag defective 
PCE and return 
for repair. 
c5 END 
-12-  

I 
_.. 
CHART NO. 8 
POWER FAILURE TRANSFER FAULTS FAULT FINDING 
SECTION 100-003-500 
JULY 1994 
From 
Start hem to 
clear powr failure 
transfer faults. 
Go to Page 4 
to classify 
fault. 
l Verify external 
equipment. 
l Verify externei 
wiring. 
Replace the 
I NO 
till the Service 
23 END 
-13- -