Ricoh D146 Service Manual page 2166

1.6 PUNCH UNIT
The punch unit is already adjusted in the factory, so you don't need to adjust it. When you need to
replace the parts of the punch unit, replace the whole unit.

Do not disassemble the punch unit. This unit is precisely adjusted in the factory.

Do not drop or give a shock to the unit when you replace it. The unit could be damaged.
1. Remove the following covers (page 1 "Rear Upper Cover, Rear Lower Cover, Upper
Cover")

Rear Upper Cover

Rear Lower Cover
2. Registration sensor bracket [A] ( ×2,
3. Stepper motor bracket [A] ( ×2,
SM
×3, ×2)
×2)
33
Punch Unit
D688/D689