Ricoh A151, Field Service Manual

Page: 60 / 397

1.5 DEVELOPMENT
1. Be careful not to nick or scratch the development roller sleeve.
2. Place the development unit on a sheet of paper after removing it from the
copier. This prevents any small metal objects (staples, paper clips,
E-rings, etc.) from being attracted to the development roller and getting
inside the unit.
3. Never loosen the two screws securing the bias terminal block. The
position of the terminal block is set with a special tool and instrument at
the factory to ensure the proper gap between the drum and the
development roller.
4. Never loosen the three screws securing the doctor plate and the four
screws securing the doctor plate mounting bracket. The position of the
doctor plate is set with a special tool at the factory to ensure the proper
gap between the doctor blade and the development roller.
5. Clean the drive gears after removing used developer.
6. Developer initial setting (SP65) is necessary when the developer is
replaced.
7. Dispose of used developer according to local regulations.
8. When installing new developer or manually rotating the development
roller, always make sure to turn the gears in the direction shown in Sec.
5 (Developer Replacement). The copier might be damaged if they are
turned in the opposite direction.
1.6 TONER SUPPLY
1. Clean the image density sensor with a blower brush.
2. Do not touch the sensor pattern with bare hands.
3. Image density sensor adjustment (Vsg Adjustment [SP54]) is required in
the following cases:
a) When the image density sensor is replaced
b) When the main board is replaced
c) When the drum has been replaced and Vsg is out of specification
d) When there have been problems with toner supply and Vsg is out of
specification
A151/A152 4-4 FSM