Troubleshooting
7 - 23
OKIOFFICE 44
Service Manual, P/N 59276801
7.1.15 Tone (TEL/FAX) Send Test
Start
No
Pseudo-Ring Back Tone
signal appears
across L1 and L2?
Yes
MF signal appears across CN10-A8, B8
(S) and CN10-A12, B12 (0V) of R44 board?
Replace R44 Board.
Replace WN5 Board.
Solved?
Replace R44 Board.
Signal route:
CN3-15, 16
→
T1-3, 1
→
CN1-3, 4
End
No
Yes
Yes
No
Return to section 7.1.1
Connect oscilloscope probe
across the line terminals
L1 and L2.
Perform TONE (TEL/FAX)
SEND TEST. (See 6.12.)
Possible cause:
CML signal
Signal route:
IC8-26 to 33 (ADO to AD7)
→
IC8-
IC12-7 (S)
→ΧΝ10−Α8, Β8 (Σ)
Notes:
The pseudo-ring back tone is sent to the
telephone line for TEL/FAX automatic
switching.
Test Points for the MF signal are difficult to reach.
Use great care to prevent causing a short.
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...