Gestetner G060 Service Manual page 242

PROCESS CONTROL
• If it is set to 0, the LD power is fixed at the value of SP2-103-1, to -27.
• If it is set to 1, LD power is selected using the same memory table as mentioned
above.
• If it is set to 2, LD power is determined by ID sensor highlight pattern generation
(steps 6 to 8 later in this procedure).
The machine also adjusts V
development gamma detected by process control will be the value stored in SP3-
120-1 to -4 (do not adjust in the field unless advised to do so).
After that, the machine cleans the transfer belt by applying a positive dc charge to
the cleaning roller for three rotations of the belt. It does not use the cleaning blade.
Allowable changes to V
This depends on the process control type as follows.
• Forced : No limit
• Initial, After Developer Initialization: ± 80 volts
• Interval (Job End/ Non-use Time/ During Toner End Recovery): ± 40 volts
• Interval (Interrupt): Constant (The memory table is not used.)
Steps 6 to 8 are carried out only if SP3-125-2 is set to 2. (Default: Steps 6 to 8
are not used)
Step 6: ID Sensor Highlight Pattern Generation
1 5 m m
The machine makes a 10-grade (12 mm x 15 mm) on the transfer belt for each
toner color. The patterns are dot patterns, not solid colors like for the process in
step 2. Each grade of the pattern is made using the bias and charge roller voltages
selected above, and the various grades are made by changing the LD power.
Step 7: Sensor Pattern Density Detection
The ID sensor detects the densities of the 10 patterns for each color. This data
goes to memory.
G060
(toner density target) at the same time so that the
REF
, V , and V
D B
1 2 m m
as a result of process control:
L
6-12
G060D154.WMF
SM