Ricoh Robin Service Manual page 231

24 June 1994
1.9 JITTER
- Problem -
Jitter appears on the copy.
- Possible Causes -
1. Drum not turning smoothly
2. Scanner not moving smoothly
- Action -
Does the jitter interval change when a reduction copy is made?
Yes No
Check drum drive mechanisms such as the drum drive belt and drum
pulleys.
No Good
Reinstall them correctly or replace the defective parts.
Is the scanner wire tension correct?
Yes No
Readjust the scanner wire tension.
Does the voltage of CN105-2 through 5 on the main board stay at 24 volts
when the Start key is pressed?
24 volts Not 24 volts
Replace the scanner motor or check the scanner drive.
Replace the main board.
6-13
COPY QUALITY