Ricoh FT8680 Service Manual page 281

AROUND THE DRUM
5.6 CORONA CURRENT AUTO ADJUSTMENT
NOTE: 1. Since each corona current has been adjusted precisely at the
factory using special tools, the following procedure can be
performed only when a power pack is replaced.
2. Before performing this procedure, the drum and corona wires must
be replaced and the corona unit must be cleaned.
5.6.1 Charge Corona Adjustment
NOTE: Do not set the Auto Drum Current Adjustment Mode in the SP mode.
Otherwise, other corona current will also be adjusted and may not be
set to the proper value.
1. Enter SP Adjustment Mode [9] page 1.
2. Make sure that the charge corona output value is the same as that of the
factory setting.
NOTE: Remove the left upper cover. There is SP data sheets inside the
left upper cover which gives the factory settings.
3. Enter SP Test Mode [8] page 3.
4. Set the Process Control Initial Setting and press Start key.
5. Exit from the SP mode and reset DIP SW #3 on the reset switch PCB.
5.6.2 T/S Corona and PTC Current Adjustment
NOTE: 1. The following procedure will also adjust the charge corona current
at the same time. Make sure that the charge corona unit is also
cleaned and the wire is new.
2. Even if only one of these power packs is replaced, you must
perform the following procedure for both corona current
adjustments.
1. Enter SP Adjustment Mode [9] page 1, 2, and 3.
2. Make sure that the charge corona, T/S, and PTC corona output value is
the same as that of the factory setting.
NOTE: Remove the left upper cover. There is SP data sheets inside the
left upper cover which gives the factory settings.
3. Enter the SP Test Mode [8] page 3.
4. Set the Auto Drum Current Adjustment Mode.
5. Set the Process Control Initial Setting and press Start key.
6. Reset the Auto Drum Current Adjustment Mode.
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31 July 1995