Troubleshooting
7 - 17
OKIFAX 5300/5600
Service Manual, P/N 59278301
7.1.13 High-speed Modem Test
Modem's signal appears
across
CN3 (NCU)?
Start
TX
Which mode, TX or RX?
Yes
Return to Sect 7.1.1
Connect oscilloscope probe
across the line terminals
L1 and L2
Perform H-MODEM SEND
TEST for the transmitter and
H-MODEM REC TEST for
the receiver. (See Fig. 6.9.1)
No
Solved?
Yes
Replace WN5 Board.
Replace M17-x Board.
TX End
Signal route:
CN3-15, 16
→
T1-3, 1
→
CN1-3, 4
RX
Modem's signal appears
across L1 and L2?
Replace M17-x Board.
No
A
Possible cause:
CML signal
Yes
No
Signal route:
IC8-26 to 33 (AD0 to AD7)
→
IC8-1, 2
→
IC12-7 (S)
→
CN10-A8, B8 (S)
→
CN1-3, 4 (S)
Summary of Contents for OF5600
Page 376: ...Illustrated Parts List D 2 OKIFAX 5300 5600 Service Manual P N 59278301 1 Cabinet Assembly...
Page 388: ...Illustrated Parts List D 14 OKIFAX 5300 5600 Service Manual P N 59278301 5 Scan Unit...
Page 394: ...Illustrated Parts List D 20 OKIFAX 5300 5600 Service Manual P N 59278301 8 Option Telephone...