Poor Transmitted Copy Quality - Panasonic UF-580 Service Manual

4.6.2.

Poor Transmitted Copy Quality

START
Make a copy.
Is the printed copy normal?
Yes
Perform a transmission test
to a reference fax unit.
Is the transmitted copy
normal?
Yes
Does poor transmitted copy
appear when transmitting to
a specific receiver?
Yes
The receiving unit may be
defective.
END
No
Is the LED Array lit?
Yes
Are CN7 (SC PCB)
and CN30 (CCD PCB)
connected properly?
Yes
1. Replace the Scanner
Block.
2. Replace the SC PCB.
No
1. Check CN18 (SC PCB)
and CN28 and 29 (MJR PCB).
2. Check the telephone line cable.
Replace if necessary.
No
Telephone line quality is
poor.
No
Does CN1, pin 1 on the
SC PCB measure
+24 VDC?
Yes
Does nLEDON go Low
when the scan starts?
Yes
Check CN1 on the SC
PCB and the LED
harness.
Does the problem still
occur?
Yes
Replace the LED Array.
No
Connect them correctly.
122
No
Replace the LVPS.
No
Replace the SC PCB.