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Exposure Lamp voltage data is sent to the Optics Control Board by the Main Board
(TXD). In turn, the Optics Control Board sends the Exposure Lamp PWM to the
AC Drive Board. The main CPU monitors the Lamp Monitor Signal and makes
changes to the data (TXD) to compensate for minor fluctuations in line voltage.
Block diagram of the Lamp Monitor circuit located on the AC drive Board.
The purpose of the lamp monitor circuit is to monitor the AC line voltage and
to
compensate for minor fluctuations in the line voltage.
Confirm Charge and Grid PWM
1. Turn off Process Control, SP Adjustment page 8, select reset.
2. Adjust Grid Voltage to 870 volts,( see chart below ) to confirm Grid and Charge
PWM.
3. Connect meter CN602 on High Voltage Control Board ( see chart below ).
4. Make a copy with meter connected, to monitor Charge and Grid PWM.
The 700 to 1200 volt range is provided to illustrate the relationship between Charge and Grid PWM
Confirm Development Bias
1. View development bias, SP mode Data Out, page 2, "Development Bias,
Image".
2. Enter Output mode, SP Test Mode, page 3. Enter output number 62.
3. Connect meter to Development unit magnetic roller front pin and frame ground.
4. Compare the readings from data out and voltage from meter reading. If vastly
different, check the Development Bias Terminal for over greasing ( grease is
conductive and can provide development bias voltage a path to ground). If the
Development Bias Terminal is OK, try replacing the High Voltage Control
Board.
A095/A096/A097
Block diagram of Exposure Lamp circuit
5-131
Rev. 6/13/97
FSM
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