Инструкции По Обслуживанию для HP color laserjet 2550 series
Engine control system
The engine control system coordinates all printer functions. It drives the laser/scanner
system, the image formation system, and the pickup and feed system.
system, the image formation system, and the pickup and feed system.
The engine control system contains the following components:
●
Dc controller
●
High-voltage power-supply PCB
●
Low-voltage power unit:
●
Fuser-control circuit
●
Low-voltage power-supply PCB
Figure 4-2.
Engine control system (includes the basic configuration of the printer)
Basic sequence of operation
Operation sequences are controlled by the CPU in the dc controller in the engine control
system.
system.
describes engine operations for each period
of a print operation.
Table 4-1. Basic sequence of operation
Period
Duration
Purpose
Remarks
WAIT (wait)
From the time the power
switch is turned on until
transfer-belt cleaning is
complete.
switch is turned on until
transfer-belt cleaning is
complete.
Clears potential from the
drum surface and cleans the
transfer belt.
drum surface and cleans the
transfer belt.
See
for a complete
detailed information about
timing.
timing.
STBY (standby)
From the end of the WAIT or
LSTR period until either a
print command is sent from
the formatter or the power is
turned off.
LSTR period until either a
print command is sent from
the formatter or the power is
turned off.
Prepares the printer to
receive print commands.
receive print commands.
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Chapter 4 Theory of operation
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