Toshiba Strata Xiie, Strata Xxe Electronic Key Telephone Systems Installation And Maintenance Manual

CHART NO. 1 
FAULT CLASSIFICATION 
From 
FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
(cont.) 
t NO 
MOH. BGM, Page 
or Relay Servvx 
t NO  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 2 
POWER FAULTS 
here from the NO 4 Go to Page 4 
to classify 
fault. 
YES YES 
NOTES: 
1. Check HPSU voltages per Figure 2. 
2. If HPSlJ voltages are not 
correct, reset with circuit breakers per 
Fiaure 2. 
3. Vkfy that power is present in 
at least one EKT connected to 
each HSTlJ. 
Call the Service 
> 
Center for 
assistance. 
-6-  

CHART NO. 3 
STATION FAULTS FAULT FINDING 
SECTION 3QO-020~500 
DECEMBER 1986 
/ -1 line cord. 
I 
NO 
YES 
END 
YES 
stations cn the 
To 
-7-  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 3 
STATION FAULTS 
(cont.1 
Replace the 
appropriate 
HSTU. From 
statIons served 
NO Replace the 
appropriate 
i-----J HCBU. 
YES 
YES 
I 
I NO 
Tag the 
defective unit(s) 
and return 
for repalr. 
L1 END Replace the 
HCAU 
(refer to 
Paragraph 05.01) NOTE: 
STRATA XX, only. 
(STRATA XII, uses 
only one HCBU.) 
HCBlJ #I supports 
stations 10~42, 
HCBU #2 supports 
stations 43&65. 
1. Perform the 
initialization 
SequenCe before proceeding. 
2....

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 4 
HKSU FAULTS 
From 
KSU 
0 
Page 4 
From 
Kl 
This 
Page 
P  here from the NO 
5 Go to Page 7 
to classify 
fault. 
From 
Replace all PCBs 
in above list with 
a known good set 
(refer to 
Paragraph 05.011. t NOTES: 
1. Perform the 
initializa bon 
1 YES 
Call the Serwce NO 
Center for r 
assistance.  Remove all PC& 
from the HKSU 
except: 
HCAUICAAU 
HCBU #l 
HINU 
HSTU #l 
l--r---- 
time. 
-If trouble occurs, 
reolace suspected 
I.22 
one...

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
here from the 
CHART NO. 5 
CO LINE FAULTS 
Go to Page 4 
to classify 
fault. 
as required. END 
t NO 
t NO t 
Replace 
STAU associated 
with affected 
/ Is  .-- I Tao the I 
defective unit(s) 
and return 
for repatr. Verify continuity 
of wiring between 
that HCOU and 
the connecting 
-1 o-  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 5 
CO LINE FAULTS (cont.) 
Replace the 
YES 
Replace the 
HCAUICAAU 
(refer to 
Paragraph 05.01 I.’ 
NOTES: 
1. Perform the initialization 
1 YES sequence before proceeding. 
2. Reprogram as required. 
Remove all PCBs 
from the HKSU 
except: 
l HCAU/CAAU l HINU 
- HCBU #l 
. HSTU #1 
l HCOU 
NO 
l Reinstall PCBs, 
one at a time. 
l If troubles occurs. 
replace suspected 
PCB. Tag the 
defective unit(s) 
v 
and return 
for repair. 
t 
EN0 
-ll-  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 5 
CO LINE FAULTS (cont.) 
1 
Page 11 
Y 
Replace all PCBs. 
one at a time 
in the order listed 
above, until the 
fault is cleared 
(refer to 
Paragraph 05.01). 
1 --- 
NOTES: 
1. Perform initialization 
l Reinstall remaining 
PCBs, one at a Tag the 
YES 
~ time. defective unit(s) 
l If trouble occurs. and return 
replace suspected for repair. 
PCB. 
Call the Servlce 
assistance. 
-12-  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 6 
INTERCOM FAULTS 
From 
INT 
Page 5 
c  ziizicL}-------- 
NO 
fransmlss8on 
HSTU and STAU s. 
Replace the 
HINU. 
Y NO 
ICl 
u Page 14 
t t 
Tag the 
defective unit(s) 
and return 
for repair. 
END  

FAULT FINDING 
SECTION 300-020-500 
DECEMBER 1986 
CHART NO. 6 
INTERCOM FAULTS (cont.) 
Replace the 
HCAUICAAU 
(refer to 
Paragraph 05.01). 
1. Perform the 
initialization 
2. Reprogram 
YES 
NO 
Replace the. 
HCBU #l. Replace the 
HCBU #2, if 
equipped (STRATA 
xx, only). 
e3 EN0 
-14-