Xerox WorkCentre Pro 423 Service Manual page 108

WorkCentre Pro 423/428
2.3.2.1 ISDN Line Basic Troubleshooting Flow
Action/work
Judgment
D channel
,&0 HUURU
No
*2
Measure voltage at terminal connection block (TA-RA and TB-RB voltages from 36 to 42 V?)
*2
DSU TA-RA and TB-RB
voltages from 36 to 42 V?
Yes
(1)
Yes
Unique to ISDN communication?
*1
Error Code
D channel B channel (Comm mode)
ICM G4 mode G3 mode
K0-00, 03 K7-07 K6-0 to 07
K6-03, 07 X3-00to40 K7-00 to 07
K9-01 X2-00 to 75
X3-60 
G HUURU
Eject ICM trace data
Yes
SETUP signal
recorded?
Analyze DISC/STATUS signal
from network
Take action
based on Q931
reason display
No Yes
Check cable
continuity. Normal?
No
No
(2)
(3)
2-76
03/02
Communication error
No
kaise
The table at left uses the error codes of Able 3351G/3321G
and DC400G.
G3 error
Eject G4M network layer trace data
Originating from or terminating at local machine?
Origination
Sending CQ, CI, SQ,
SI, RQ, or RI packet
from remote machine?
Yes No
Analyze cause/
diagnostic code
Set trace layer to session
and send G4M protocol
Take action based on
by re-communication
cause/diagnosis
Yes
(4)
CHAPTER 2 TROUBLESHOOTING
Level 2 Troubleshooting
Perform analogue communi-
cation troubleshooting
Termination
Sending CQ, CI, SQ,
SI, RQ, or RI packet
from local machine?
No Yes
*4
Start Fax self-diagnosis
Error code displayed?
Yes No
Replace
G4M PWB
(5) (6)