Panasonic UF-890 Service Manual page 145

4.4.14 Poor Printed Copy Quality
START
Is the printout in Service Mode 3
normal?
Yes
Make a local copy.
Is the printed copy correct?
Yes
Perform a receiving test with the
reference fax unit.
Is the received copy correct?
Yes
Is a poor copy printed when
receiving from a specific
transmitter?
Yes
The transmitting machine may be
defective.
END
No
1. Replace the LPC PCB.
2. Replace the LSU.
3. Replace the HVPS.
4. Replace the Toner Cartridge.
No
Check the Transmission Block
(CN30 on the CCD PCB and
CN5 on the FCB PCB).
No
1. Check CN3 on the FCB PCB.
2. Check CN25 on the LCU PCB.
3. Check the Line Cord.
4. Replace the FCB PCB.
No
Telephone line quality is poor.
(Refer to Sect. 4.6.)
145