Ricoh G104, Service Manual

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Process Control
G160/G161 6-8 SM
N is adjusted with SP 3558.
5. Installation
This starts only when this machine turns on at first installation. The machine does this if SP
5950 1 is set to "1" (set in the factory).
6. After Toner End Recovery
This starts after recovery from a toner end condition.
7. After Developer Initialization
This starts after a developer initialization is done. Developer initialization occurs
automatically after a new PCU is installed.
8. After Transfer Belt Unit Initialization
This starts after a transfer belt unit initialization is done. Transfer belt unit initialization
occurs automatically after a new transfer belt unit is installed.
9. Forced
This is done when SP 3820 1 is used.
Process Control Self-Check Procedure
Step 1: VSG Adjustment
This machine uses three ID sensors (direct-reflection type). They are located at the left,
center, and right of the transfer unit. Only the center ID sensor is used for process control.
The ID sensor checks the bare transfer belt's reflectivity and the machine calibrates the ID
sensor until its output (known as V
SG
) is as follows.
ƒ V
SG
= 4.0 ± 0.5 Volts
This calibration adjusts for the transfer belt's condition and the ID sensor condition, for
example, dirt on the belt or ID sensor.
Step 2: ID Sensor Solid Pattern Generation
The machine mixes the developer and then makes a gradation pattern on the transfer belt
for each toner color. The pattern has one square (the sequence is as follows: one black
square, one magenta square, one cyan square and one yellow square). Each of the
squares is 15.03 mm x 12.23 mm, and is a solid-color square. To make the squares, the
machine changes the development bias and charge roller voltage. The difference between
development bias and charge roller voltage is always the same.
Step 3: Sensor Pattern Detection
The ID sensor detects the densities of the one solid-color square for each color. This data
goes to memory.
Step 4: Toner Amount Calculation
The quantity of toner on the transfer belt (M/A, mass per unit area, mg/cm
2
) is calculated
for each of the 10 gradations of the sensor pattern. To do this, the machine uses the ID
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