Toshiba Perception 1 2 User Manual

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 20 
RlNGlNGlRlNGBACK TONE FAULTS 
Fault Classification Go to Page 4 
to classify 
fault. 
To 
faulty at electronic/digital 
 
NO 
J 
Replace any 
faulty standard 
telephone(s). Replace the NSTU 
replaced SlT/2500- 
Measure the ringer 
voltage at the 
backplane (between 
pins 26 & 26). 
Tag the 
defective unit(s) 
and return 
 creareo? 
/ for repair. 
I 
( END ) Call the Service 
Center for 
assistance. 
-38-  

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 20 
RINGING/RINGBACK TONE FAULTS (continued) 
From 
s2 
Pages 
14,38 
I-;’ 
Remove all 
NSTUs and 
the NPRU. 
- Reinstall all PCBs, 
one at a time. 
. Note any failure 
(ringer voltage out 
of spec) and replace 
the suspected PCB. 
PCB also cause 
1 
Call the Service Tag the 
defective L 
-39-  

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 21 
MISCELLANEOUS FAULTS 
From  From I Ha? 
more tl 
one unit been  one unit 

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 22 
NMDWNDCU FAULTS 
From n 
here from 
the 
Fault Classification 
Either leave the 
circuit(s) disabled 
or enable them as 
required. 
-41-  

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 22 
NMDUINDCU FAULTS (continued) 
NOTES: 
7. Verify that T & R 
are not reversed. 
2. This question also 
refers to combined 
electronic telephone/DDIUs. 
I YES 
NOTE: If any NMDU/ 
I.““” *, AfnP’ ’ -ircuit(s) is/are 
still disal 
5ted, the fault 
-t  indicates 
: something ,, 
besides / disabled state. ‘ 
‘ 
‘ Using the TPER Program, disable 
and then enable the 
corresponding 
faulty circuits. 
. I 
‘ 
‘. 
. 
‘ 
‘. 
A 
Replace the NMDU/ 
NDCU...

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 23 
DATA COMMUNICATION STATION FAULTS 
/ Did  I I 
Y 1 
NO 
Concentrate on 
on stations assigned 
to the same PC6 
NOTE: Consult ‘ES 
NO 
. Verify that the DTR control 
signal is active (Sep DIU = 
Terminal Ready LED on). 
. Verify the station’s W-232 cable. 
- Verify that the DIU DTUModem and 
Mode switches are correctly set. 
. Verify that the computer/ 
terminal works properly. 
. Verify that the Baud rate 
and data format are compatible. 
-...

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 23 
DATA COMMUNICATION STATION FAULTS 
(continued) 
From From 
4 NO 
TO 
- 
I 1 - Verify that the DTR contrc 
signal is active. 
(Sep DIU = Terminal 
Ready on.) 
- Verify the station’s RS- 
232 Cable. 
- Verify that the computers/ 
terminals work properly. 
- Verify that the Baud rates 
and data formats are 
compatible. 
- Verify that the Mode 
Switch and the DTE/ 
Modem switch are 
set correctly (DDIU- 
MAT and DDIU-MA) 
. Correct if faulty. 
1...

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 24 
DATA COMMUNICATION TRUNK FAULTS 
Go to Page 4 
to classify 
fault. 
To 
- Verify that the computer/terminal 
Baud rate and data format are 
compatible with the distant end. 
. If synch data is used, verify that 
the DIU mode switch is set correctly. 
. Correct if incompatible. -----_--___ p 
To 
Tag the 
defective unit 
and return 
for repair.  

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
CHART NO. 24 
DATA COMMUNICATION TRUNK FAULTS (continued) 
Page 45 
v 
I 
Using the TPER Program, 
disable all NMDU PCBs, 
except the one at 
the lowest PCB 
location number. Concentrate on 
clearing faults 
related to one 
NMDU PC0 
location. 
than one NMDU 
Using the TPER Program, 
disable all NMDU PCBs 
except the next one that 
is numerically higher than 
7 
the NMDU last verified 
as free from faults. 
I ,’ 
I 
YES - 
a’ ‘ 
8’ ‘ 
‘* 
wr To@ 
the NMDU...

FAULT FINDING 
SECTION 200-255-500 
MARCH 1991 
( 
i CHART NO. 24 
DATA COMMUNICATION TRUNK FAULTS (continued) 
no other call 
intetferes on this 
port during tests. 
. Verify that the Baud 
rate and data format 
are compatible to the 
distant end. 
. Verify that the DTE/ 
MODEM switch is 
set to MODEM. 
. If synch data is used, 
verify that the DIU 
mode switch is set 
correctly. 
. Verify that the modem 
is compatible. 
. Verify that the DIU 
and modem cables are 
properly connected. 
(See section...