Protective Functions; High-Voltage Power Supply Circuit; Controlling The Energy Save Mechanism; Outline - Canon imageCLASS D600s Service Manual

CHAPTER 4 OPERATION
7.1.2

Protective Functions

The power supply PCB is equipped with an over-current/over-voltage protection mecha-
nism to prevent damage to the power circuit in the event of an over-current or over-voltage,
as caused by a short circuit or the like on the load side. If the over-current/over-voltage pro-
tective mechanism has gone ON, turn off the power switch, and correct the fault; then, turn
on the power switch once gain to reset the machine. If short circuiting and resetting are re-
peated, the internal fuse (F1, F2, F101) can melt.
7.2

High-Voltage Power Supply Circuit

The high voltage output circuit is built into the DC controller PCB.
The CPU on the DC controller PCB sends instructions for the generation of the following
high voltages at specific timing:
• primary charging roller application voltage (AC voltage + DC negative voltage)
• developing bias (AC voltage + DC negative voltage)
• transfer charging roller application voltage (DC positive voltage or DC negative voltage)
7.3

Controlling the Energy Save Mechanism

7.3.1

Outline

The machine is equipped with an ESS mechanism to limit the consumption of power in
standby as much as possible. The ESS function is controlled by the image processor PCB,
and the machine shifts to ESS state when the Energy Save key in the control panel is
pressed or the machine remains in standby state for a specific period of time.
The standby period after which the ESS state is started is set in user mode: 3 to 30 min
(factory default: 5 min).
7.3.2

Operation

While the machine remains in ESS state, all in the control panel except the LED indicator
of the Energy Save key will remain OFF. The machine will not shift to ESS state under any
of the following conditions:
• The shift to ESS state is not enabled in user mode.
• A jam or a service error occurred, and the Error lamp is ON. (In the case of the ab-
sence of toner or paper, the machine shifts to ESS state in the absence of paper.)
• The image memory contains image data.
While the machine is in ESS operation, it will shift out of the state in response to a press
on the Energy Save key; in addition, it will automatically shift out of the state under any of
the following conditions:
• Print data arrives from the PC.
• A fax arrives.
• Off-hook state is detected.
• A report output time occurs.
• A timer call time occurs.
*1: only if equipped with fax functions.
*2: only if equipped with printer functions.
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COPYRIGHT © 2001 CANON INC.
Chapter4.p65
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CANON imageCLASS D600s/PC1060s/PC1200s/iR1200s REV. 0 SEPT. 2001
32 8/26/01, 3:44 PM