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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 CN 9, pins 1 and 2, of
the FCB PCB measure +24 VDC?
(Pin 2 is not used for UF-890)
Yes
No
Yes
No
Are CN5 (FCB PCB) and
CN30 (CCD PCB)
connected properly?
Connect them correctly.
Replace the LVPS (POW).
Does LEDD go Low when
the scan starts?
Check CN 9 on the FCB
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 FCB PCB.
Replace the FCB PCB.
Is the transmitted copy
normal?
No
Yes
Yes
No
No
1. Check CN3 (FCB PCB)
and CN25 (LCU PCB).
2. Check the telephone cord.
Replace if necessary.
Does poor transmitted copy
appear when transmitting to
a specific receiver?
Telephone line quality is
poor.
END
Yes
Yes
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