Toshiba Perception Electronic Business Communications System Installation And Maintenance Manual

Fro 
key on the DPMU 
* Wait a few 
seconds for 
initialize to 
Depress the LOAD 
key on the DPMU 
0 Wait approx. 30 
seconds for re- 
load to complete. 
cycle completed?  

< 
all station- / riisl +n”o  ‘”  -.-. .“..” to-station calls 
work properly? 
YES 
or TIE trunk 
NO 
To 
TTY or MODEM NO 
YES 
Fault should have 
been classified, 
return to Page 4.  

Start here to 
I--------  c/ea;&;;Ying 
Go to Page 4 
the disk drive 
r 
Replace the 
YES Replace the 
Replace the 
DCCU. 
L-l-- 
defective unit(s)  

From 
Tag the DPMU 
as defective - 
do not reinsert. 
YES 
Replace the 
DPMU and DCCU 
with a known 
good pair. 
To From 
Depress the LOAD 
key momentarily. 
Verify loading is 
completed. ---- 
NO 
Replace the 
DFRA. 
NO 
defective unit(s) 
1 
-----  

e Tag the DPMU and  e Tag the DPMU and 
DCCU as defective,  DCCU as defective, 
Do not reinsert.  Do not reinsert. To 
voltages within 
Call the Service 
Center for 
assistance. 
YES 
Tag the 
defective unit(s) 
and return 
for repair.  

Fro 
Start here to 
clear PO wer 
faults. 
Switch main 
circuit breaker 
to OFF then back 
NO 
e Switch main circuit 
breaker to OFF. 
e Depress the circuit 
breaker(s) 6l~Sl4 
that correspond(s) 
to the LED(s) that 
is/are off. 
* Switch main circuit 
breaker to ON. Replace the 
power supply. 
Tag and return 
it for repair. Switch main 
circuit breaker 
to OFF. 
Open the rear 
cabinet connection 
Disconnect the DC 
power supply cables 
to JZOI and J202. 
b If this is a power 
supply “LED off” 
fault,...

From 
B2 
0 
Page 11 
power supply. 
Tag 
it and return 
To Disconnect the 
DFRA power cables 
(~80/81 and J51). 
Remove all 
PCBS. 
supply “LED off” 
fault, depress the 
circuit breaker (S’l& 
Sl4) -that corres- 
ponds to the LED(s) 
that was (were) off. 
a Switch the main 
circuit breaker ON. 
Problem is on the 
backplane. To 
clear it, refer 
to Figure 2 on 
Page 40. fault cleared? 
llM’PORTANi7 
Make .sure power 
is off whenever 
removing/inserting 
a PCB or connecfor. ;’ LED (si bknb 
1’ off or the...

From 
fA 
Measure the 
ringer voltage at 
the backplane, 
between pins 27 
and 28 on DPMU. 
The DFRA or 
DCCU has a faulty 
indicator. Replace 
the defective unit 
at a convenient 
time.  

From 
Start here to 
Go to Page 4 
to classify 
fault. 
The following instructions 
will cause all calls in 
progress to be disconnected 
and no new calls will be 
established. - 
Do not continue while 
there are calls in progress. 
* Replace the DTCU, 
* Verify that the 
clock LED is 
flashing.