Panasonic Facsimile UF-590, Service Manual

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