Main Motor (Ml) Functional Check - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Main Motor (Ml) Functional Check
The Main Motor drives d] moving components in the paper path (see Chapter 5, Section 5-3,
Figures 5-13 and 5-15). The printer's Main Motor is a four-phase stepping motor controlled by the
submicroprocessor on the DC Controller PCA. Motor operation begins when the Print (PRNT)
signal is generated by the main microprocessor on the DC Controller PCA. Four output control
signals from the DC Controller PCA (A, ~, B, and ~) are input to the DC Power Supply Assembly
and are used to control the Main Motor. During normal operation, the Main Motor is enabled
three seconds prior to paper being delivered to the Registration Rollers. The Main Motor remains
enabled until dl printing is completed and dl paper has been moved to the output tray.
The Main Motor, under normal conditions, is driven for one second at printer powerup.
Table 7-10. Main Motor Checks
1. Is the Main Motor connector firmly seated Vlsudly inspect. Reseat connector if necessary.
into J3 on the DC Power Supply Assembly?
'2.
Is the DC Power Supply Assembly correctly Visually inspect. Verify that dl pins are making
seated into its connector.
contact with their connectors and that no pins
are bent or damaged.
13.
Is the DC Power Supply Assembly defective? ISee the following Functional Check.
4.
Is the Main Motor defective? See the following Functional Check.
15.
Is the DC Controller PCA defective? ISee the following Functional Check.
To verify that the Main Motor is operational, perform the following
1. With the printer powered ON, open the printer Top Cover Assembly.
2.
Defeat the Top Cover Assembly Interlock and EP-S Cartridge Instilled/Drum Sensitivi@
MicroSwitches.
3.
Press the TEST PRINT button and observe the Main Motor and the gear train.
If the fuser temperature is greater than 150° C (00 READY on Control Panel), motor operation
begins as soon at the Test Print button is pressed. If the Main Motor is not operating, change the
following assemblies in the order listed:
1. DC Power Supply Assembly.
2. Main Motor.
3, DC Controller PCA.
Note
If the Test Print button does not appear to be operational, ensure that Manual
,8
Feed has not been selected (i.e., set to ON) and that the fuser is warmed up (00
w
b
READY on the Control Panel display).
7-33