Ricoh FT4460, Service Manual, Page: 256 / 413

28 February 1989
2.10 DEVELOPMENT BIAS MEASUREMENT
1. Place the SP mode data sheet on the exposure glass and turn DIP switch
1 - 4 ON.
2. Press the keys in the following order and make an A3 (DLT) size copy to
confirm the bias set for the SP mode data sheet.
“1” –> “#” Enter key –> Start key
3. Open the rear cover and lower the I/O control board [A] (1 screw).
4. Turn DIP switch 1 - 1 (free run) ON.
5. Set meter scale to 1500 Vdc.
6. Attach one lead of the meter to the retainer [B] and the other to the bot-
tom of the chassis [C] as shown in the figure.
7. Press the Start key and measure the bias voltage. Voltage should be ap-
proximately -200 Vdc with the Manual ID level set to the center position
(level 4).
NOTE: The voltage measured by the multi-meter is the summation of the
standard bias and the correction bias as shown in the following table.
Black Development Bias = 1 + 2 + 4
Color Development Bias = 1 + 3 + 4
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