HP LaserJet 1010 Service Manual - Page 59

Basic sequence of operation (formatter-to-printer),

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➂ ➃ ➄ ➅ ➆ Figure 4-7. ➁➀ Solenoid, photosensors, and switches 1 Door switch detects whether or not the print cartridge door is closed. Printing cannot continue until the print cartridge door is closed. 2 Power switch. 3 Paper-width sensor senses the width of the paper. 4 Paper delivery sensor senses when paper has successfully moved out of the fusing area. 5 Top-of-page sensor detects the leading and trailing edges of the paper. It synchronizes the photosensitive drum and the top of the paper. 6 Solenoid. 7 Motor. Basic sequence of operation (formatter-to-printer) The operation sequence of the printer is controlled by the microprocessor (CPU) on the ECU. The following events take place during normal printer operation: Table 4-1. Basic sequence of operation Period Purpose WAIT After the product is turned To clear the drum surface of on until the end of the initial potential and to clean the rotation of the main motor. primary charging roller. STBY (Standby) From the end of the WAIT period or the LSTR period until the pickup command is sent from the formatter. Or, from the end of the LSTR period until the product is turned off. To pause until the product is ready to print. Remarks Detects whether or not the cartridge is installed. ENWW Printer functions 47

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Figure 4-7.
Solenoid, photosensors, and switches
1
Door switch detects whether or not the print cartridge door is closed. Printing cannot continue until
the print cartridge door is closed.
2
Power switch.
3
Paper-width sensor senses the width of the paper.
4
Paper delivery sensor senses when paper has successfully moved out of the fusing area.
5
Top-of-page sensor detects the leading and trailing edges of the paper. It synchronizes the
photosensitive drum and the top of the paper.
6
Solenoid.
7
Motor.
Basic sequence of operation (formatter-to-printer)
The operation sequence of the printer is controlled by the microprocessor (CPU) on the ECU.
The following events take place during normal printer operation:
Table 4-1. Basic sequence of operation
Period
Purpose
Remarks
WAIT After the product is turned
on until the end of the initial
rotation of the main motor.
To clear the drum surface of
potential and to clean the
primary charging roller.
Detects whether or not the
cartridge is installed.
STBY (Standby) From the end
of the WAIT period or the LSTR
period until the pickup
command is sent from the
formatter. Or, from the end of
the LSTR period until the
product is turned off.
To pause until the product is
ready to print.
ENWW
Printer functions
47