Toshiba Strata Se, Strata Vie General Description Manual

01 GENERAL 
01 .Ol Thus section describes the maintenance 
procedures used for the diagnosis of faults in this 
electronic key telephone system. Faults are clas- 
sified and then cleared by replacing the apparatus 
and performing operational tests in the se- 
quences prescribed by the fault clearing flow- 
charts in Paragraph 05. 
02 FAULT CLASSIFICATION 
02.01 
A Fault Classification Flowchart is pro- 
vided to ensure that fault clearing is pursued in a 
logical sequence (Chart No. 1). 
02.02 An...

FAULT FIBJDING 
SECTION 500-036-500 
JANUARY 1988 
DO NOT: 
l Drop a PCB. 
l Stack one PC6 on top of another. 
l Handle a PCB wrthout discharging any static 
electrrcity from your person by touching the 
grounded HKSU. 
l Touch PCB contacts with your fingers. 
IMPORTANT! 
If the fault is not cleared by substituting a 
PCB, the original PC6 must be reinstalled in 
the HKSU before trying another PCB. 
04 
DEFECTIVE APPARATUS RETURNS 
04.01 When a defective system apparatus is 
shtpped for repair, the...

4) For the MDF-to-EKT cable, a more precise 
check IS made using an ohmmeter. 
TABLE B 
STATION CABLE CONTINUITY CHECK 
USING VOLTMETER 
FROM TO VOLTAGE* 
Pair Wire COb Pair Wwe CC&Or 
1 T Green 
2 T Black 24 
1 R Red 2 T Black 24 
1 T Grl??i- 2 R Yellow 24 
1 R Red 2 R Yellov: 24 
1 T 
Green 1 .R Red 0 
2 T 
Red 
2 R Yellow 
0 
3 T While 3 R 
Blue 0 
3 T Whffe 1 R Red 0 
3 3 Blue 1 R Red 0 
3 T Wh!lE 1 T Green 0 
3 R Blue 1 T Green 0 
3 T Whsre 2 T 
Black 0 
,3 R Blue 2 T Black 0 
3 T Whlre 2 A Yellow 0...

CHART NO. 1 
FAULT CLASSIFICATION 
Please read 
General Malnrenance 
Informalton before 
proceeding. 
1 
( ST?“‘) 
/ Does  
/-  
YES 
NO ------. 
To 
A 
STA 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
Uoes the 
taulr affecr all 
Lnecn 
CI breakers 
power fndl  

CHART NO. 1 
FAULT CLASSIFICATION 
(cont.) 
F ram 
1 NO 
f 
To 
To 
To 
NO 
To 
c2 
0 
Page 6 
-5- FAULT FINDING 
SECTION 500~D36-500 
JANUARY 1988  

FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 1 
FAULT CLASSIFICATION 
(cont.) 
From 
I NO 
1 NO 
1 NO 
1 NO 
Fault should have 
been classified. 
Return to Page 4. 
-6-  

CHART NO. 2 
From POWER FAULTS 
Go to Page 4 
Is the HKSU 
l Power swatch off. l Operate the 24V 
circuit breaker 
on the HKSU. 
l Power switch on. . Replace HKSU. 
l Tag defective 
HKSU and returr 
for repaIr. 
I 1 YES  . Power switch off. 
. Operate the 24V 
i 
c!rcuIt breaker 
on the HKSU. 
l Power switch on 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
Input IO the HKS’L 
23.2- 20.2V7 
NO 
the HKSU 23.2 
l Power switch off. 
. Remove PCBs 
except the SMAUI 
VMAU. 
l Operate circuit 
breakers. 
l...

From 
Pl 
0 Page 7 
NO 
Replace the 
HKSU. 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 2 
POWER FAULTS (cont.1 
From 
one at a time. 
l Take note of 
failure If it 
occurs and replace 
l Be sure to 
switch power 
Tag defectwe 
PCBIsl and return 
for repaw. return for repalr. 
l Check power 
supply fuses and 
AC source. 
l Replace or repajr 
as necessary. 
23 END 
-8- 
l Replace power 
,.’ SUPPlY. 
l Tag defectwe 
unit and return 
for repair. 
c-4 END  

From 
STA 
c Page 4 
_c-c 
CHART NO. 3 
STATION FAULTS 
HVSU in EKT 
F ram 
To 
Tag the 
defectwe unltls) ~ YES 
and return 
for repalr. 
YES 
END Verify statton 
cable per Tables Stallon port 
on another 
FAULT FINDING 
SECTION MO-036490 
JANUARY 1988 
To 
Replace 
Replace 
aPP:oprlatr 
svcu. awromare 
SSTU. 
YES J 
v 
END  

1 
FAULT FINDING 
SECTION 500-036-500 
JANUARY 1988 
CHART NO. 4 
H KSU FAULTS 
From 
Remove’ 
scou!vcou. 
SEPU, SMOU. 
i- . Reinstall all 
I 
Replace HKSU. Tag defective 
PCBkl and 
return for repair. 
Tag defective 
H KSU and 
return for 
repair. 
-lO-