HP LaserJet II Serie Manual De Instrucciones página 220

HP 33440/HP 33449 COMBINED SERVICE MANUAL
"52 ERROR" Scanner Malfunction
The scanner motor is a flat brushless, +24 Vdc motor. Motor operation is completely controlled
by the DC Controller main microprocessor and motor speed is controlled by the SCANNER
CONTROL (SCNCONT) signal. Motor speed is monitored via the FG– and FG+ feedback signals.
LED 201 on the DC Controller PCA is illuminated when the scanner motor is at its operational
speed.
The scanner motor is enabled briefly when the printer is powered-up (during the printer's power-
on Self Test) or whenever the PR~T (PRNT) command is received by the Interface/Formatter
PCA. The motor makes a distinctive sound, identified as a '%ariable pitch whirring noise," when
statiing up. (The Main Motor noise is much more subtie and does not perceptibly vary in pitch.)
Table 7-22. Scanner Malfunction Checks
1. Are the scanner motor connectors– J401
on the Scanner Motor PCA and J203 on the
DC Controller PCA– firmly seated in their
connectors?
2. Is
the J209 jumper in place on the DC
Controller PCA?
3.
Is the problem intermittent?
+
4.
Does the scanner motor run at dl times
afier power-on, but before printing?
5. Is +24 Vdc present on J401-5 of the scanner
6.
Is the scanner motor defective?
7.
Is the DC Controller defective?
Scanner Motor Functional Check
Visually inspect. Ensure that connectors are
properly seated. If the cable is damaged, replace
the cable.
Veri@.
Replace the mble assembly to the DC
Controller.
Replace the cable assembly to the DC
Controller.
Measure the voltage. E voltage is not present,
replace the cable to the DC Controller PCA.
See the "Scanner Motor Functional Check"
following this table.
See the "Scanner Motir Functional Check"
following this tible.
While performing Test Print listen for the distinct noise of the scanner motor starting up. If this
noise can not be detected, replace the following assemblies in the order listed:
1. Laser/Scanning Assembly.
2. Laser/Scanning Cable Assembly to the DC Controller.
3. DC Controller PCA.
7-56