Toshiba Strata Dk24, Dk56, Dk96 Instruction Manual

STRATADKFAULTFINDING 
SECTION 200-096-500 
FEBRUARY1991 
7.10 Ohmmeter Test 
7.11 
The continuity of the cable run between the 
KSU and the electronic telephone is checked with 
an ohmmeter as follows: 
1) Disconnect the electronic telephone. 
2) At the MDF, remove the bridging clips. 
3) Using an ohmmeter, measure the resistance 
between all combinations of the four wires at 
the modular block. All measurements should 
TABLEE 
STATION CABLECONTINUITY 
CHECKUSINGVOLTMETER 
*Nominal voltage-within the...

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 1 
FAULT CLASSIFICATION 
Please read the 
maintenance 
information 
before proceeding. 
Start here to 
clear faults in 
STRATA DK Systems. __- _... - _____- y 
due to erroneous programming. 
1 YES 
Check 
circuit breakers 
and power 
indicators. 
I YES 
To n A r--IT- 
NOTE: 
Any time a flowchart refers to 
PCTU, the information applies to 
I PCTUI, PCTU2, PCTU3 and/or 
PCTUSl. 
-5-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
From 
CHART NO. 1 
FAULT CLASSIFICATION (cont.) 
INT 
aae 14 From 
Maintenance/ 
Fault should 
have been 
classified. 
Return to Page 5. 
To 
-6-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 2 
POWER FAULTS 
From 
‘rYES 
Power down and 
lightly press all 
circuit breakers. 
Remove all 
PCBs and power 
down and press 
breakers. 
Y YES 
Refer to the Voltage 
Distribution chart and 
install PCBs one at a time 
until faulty PCB is found. Tag the 
defective unit(s) 
and return for 
repair. 
A 
Call Service 
Center for 
assistance. 
YES 
-7-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 3 
STATION FAULTS 
Fault Classification 
 fault. ’ 
Flowchart? 
I 
Fromm \/ [Pages 15\-&YES 
NO 
“;/ 
Replace the 
it an OCA electronic telephone 
and line cord. 
Replace HVSWHVSI 
in electronic telephone 
or DVSU in 
digital telephone. 
. 
Tag the 
defective unit(s) 
and return for 
repair. q-z-) 
NOTE: The maximum distance between 
” , the electronic telephone and KSU 
.’ is 1,000 ft. using 24 AWG cable. 
To 
-B-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 3 
STATION FAULTS (cont.) 
Replace the 
EOCU on the 
all stations on PEKU, appropriate PEKU 
or PESU, if used, or 
replace the PDKU. 
‘ES 
Replace the PCTU, 
initialize the system 
and reprogram 
as required. 
defective unit(s) 
and return for Call the 
Service Center 
for assistance. 
-9-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 4 
KSU FAULTS 
Fault Classification Go to 
Page 5 to 
classify fault. 
at the electronic 
Remove all PCBs 
from the KSU 
except: PEKU, PCTU, 
PESU, or PDKU. 
accessed by ports 
PESU, or PDKU, 
/ ~~ intercom be 
 l Reinstall all PCBs, I 
one at a time. Tag the 
l If trouble occurs, --) 
defective unit(s) ar Id 
replace suspected return for repair. 
PCB. 
(r-i END 
-lO-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 5 
CO LINE FAULTS 
Fault Classification Go to 
Page 5 to 
classify fault. 
Call the 
Service Center 
for assistance.  Reprogram 
as required. 
Replace 
appropriate 
PCOU. Verify operation 
of that CO/PBX 
line. 
Replace the 
appropriate 
m,-.,-., , -- 
3. 
I Verify continuity 
of wiring between 
the PCOU and the 
connecting block.  Replace 
the wiring. 
cc; END 
.- 
From Tag the 
defective unit(s) 
and return for 
repair. END 
I-- 
,...

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 5 
CO LINE FAULTS (cont.) 
Remove all 
PCBs from the 
KSU except: 
* PCTU 
. PEKU (PESU) (PDKU) NOTES: 
1. Perform the initialization 
Reinstall PCBs 
one at a time. 
If troubles occur, 
replace suspected PCB. 
l-----i 
Tag the 
defective unit(s) 
and return for 
repair. 
I 
I 
23 END 
-12-  

STRATA DK FAULT FINDING 
SECTION 200-096-500 
FEBRUARY 1991 
CHART NO. 5 
CO LINE FAULTS (cont.) 
Replace all PCBs, 
Call the 
Service Center 
/ for assistance. 1 
(’ END 
-13-