Ricoh FT5034 Service Manual page 55

CAUTION: When performing a demonstration or during PM, make sure that
the main switch is not turned on and off repeatedly.
2. Bias Measurement
The bias voltage can be measured by directly measuring the development roller
shaft using a digital multimeter, and checking the monitor using the input check
mode.
Using a digital multimeter
a. Turn on the main switch.
b. Open the front cover and force the door
switch to turn on.
c. Hook up the multimeter leads as shown
on the right. The red wire is hooked up
to the development shaft and the black
wire is hooked up to the copier body.
d. At the manual ID level 4, set the copy
counter to "11" or more. After turning
the ready indicator on, press the Start
key and measure the bias voltage.
NOTE: Read the bias after the 11th copy
in order to get the value without
any rest time compensation.
Using the input check mode
a. Set SP mode (88) to "11".
b. Set the mode to the bias voltage check mode as follows.
Interrupt key → Numeric key "1" → Interrupt key
(After doing this, Vsp is displayed in the magnification ratio
indicator area.)
c. Set the copy counter to "11" or more at the manual ID level 4.
d. Press the Start key holding the numeric key "0" and check the bias voltage in
the magnification ratio indicator.
NOTE: Read the bias after the 11th copy in order to get the value without any
rest time compensation.
e. After measuring the bias voltage, set SP mode (88) to "10".
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More than 10 kΩ
Red Lead
Black Lead