Ricoh FT4460, Service Manual, Page: 355 / 413

28 February 1989
1.13 JITTER - 2 (Irregular)
- Phenomenon -
Jitter appears at irregular intervals, especially with enlargement copies.
- Possible Causes -
1. There is a DC power surge in the +24V scanner drive line, and this
changes the scanner drive motor speed.
2. Overload of the scanner caused by worn out sliders, an uneven slider unit
guide rail surface, or incorrect adjustment of the drive wire tension.
- Actions -
1. Check the system control board, DC power supply, and scanner drive
motor; replace if defective.
2. Check the sliding load on the scanner, the scanner drive wire tension,
and the position of the wire clamps; adjust if necessary. Also, check the
scanner sliders and replace if worn out.
12-18