LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
4-37
• Distortion/BD signal failure
Solutions: (1) Check the connection between the LASER/scanner section and
ECU board (J913/J914) connector connections.
(2) Replace the LASER/scanner section.
(3) Replace the ECU board.
• Partially compressed/stretched image
Solutions: (1) Check for foreign matter between the toner cartridge gear and the
drive gear.
(2) Check if the toner cartridge gear is broken.
(3) Replace the toner cartridge.
• Poor fixing
Solutions: (1) If the marks are at intervals of approx. 75mm (2.95"), clean the
fixing ass’y; if they are at intervals of approx. 66mm (2.60"), clean
the pressure roller.
(2) Replace the fixing ass’y.
(3) Replace the pressure roller.
(4) See the next page, and check the nip width of the fixing section.
If it is not as specified, replace the fixing pressure plate.
4.3.3 Scanning problems
• Faulty scanning (Evaluation criteria: Test print is good, but the copied image
is poor.)
• The document is not fed.
The document feed motor does not run. (Evaluation criteria: Check it
visually.)
(1) Check the connection between the document read motor and the SCNT board (J803).
(2) Replace the document read motor.
(3) Replace the SCNT board.
The document slips against the rollers. (Evaluation criteria: Check it visually.
Stretched copy image.)
(1) See page 4-3 and clean the document reading section.
(2) Replace the reading section’s rollers.
The document does not separate. (Evaluation criteria: Check it visually.)
(1) Check whether the document feed motor is driving all the rollers.
(Check for any damaged gears or foreign matter stuck inside.)
(2) See page 4-3 and clean the separation roller and separation rollers.
(3) Replace the separation roller and separation rollers.
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