| Author |
Message |
Tom
| | Posted on Sunday, October 13, 2002 - 5:36 am: | |
54.4 Cam home position sensor
. The cam sensor (PS2) did not detect home position. This message
can also occur with general printer disassembly involving the control
PCA or the developer bias supply.
- Since PS2 is located on the back of the developer bias supply,
make sure it is reconnected if the developer bias supply was
removed. (See page 139 for the location of PS2.)
- Make sure that the connector (CN802) on the control PCA is fully
seated.
. Other symptoms include the following:
- complete or partially blank pages
- smeared vertical line on the front of the page
- smeared toner image on the back of the page
Note
This message might appear as a result of the drive gears being
installed incorrectly causing a loss of cam timing. Follow the cam
timing procedure in Chapter 6 of the printer service manual to correct
the cam timing problem.
. To troubleshoot the 54.4 message:
1 Open the top cover and locate the tab that activates the AC interlock
switch. The tab is located to the right and below the black developer
and is part of the developer drive assembly. If the tab is bent, bend
the tab until it is aligned with the plunger.
2 If the tab is straight, turn the printer on while checking the 24V DC at
the test connector, which is located on the rear of the printer.
Note
The actual measured voltage will be approximately 22V DC.
3 If no voltage is present, check the interlock switches on the left side
of the printer and verify that they are working correctly. Replace the
switch mechanism if defective.
4 If the switch mechanism is okay and the voltage does not reach 22V
when the printer is turned on, replace the DC power supply.
5 If the DC voltage is OK, remove the right-side cover and watch the
AC motor (M2) to see if it turns as you turn on the printer.
6 If M2 does not turn, turn off the printer and unplug the power cord.
Disconnect the connector to M2 and connect a voltmeter.
WARNING!
With the printer turned on, there is 120/240V AC at this connector. Do
not cross the leads of your meter or touch them with your hand. Doing
so will cause damage to the printer or result in electrical shock.
7 Plug the power cord into the printer and turn the printer on. Watch to
see if the AC voltage is supplied.
8 If power is available replace M2.
9 If no power is available, replace the AC power supply in the Color
LaserJet or the DC power supply in the Color LaserJet 5/5M.
10 If the power supply does not solve the problem, follow the
procedures for the cam service Mode test to verify that the sensor is
operating correctly.
11 Run test 53 in service Mode to verify that the solenoid is operating.
You should be able to hear when the solenoid turns on or off.
Replace the solenoid if defective. A good solenoid should have a
resistance value of approximately 56 ohms.
12 If the solenoid is okay when the resistance is measured and
everything else noted above has been checked, replace the control
PCA.
Cam Service Mode test
1 Enter the status and test section of the Service Mode (see
"Accessing Service Mode" in Chapter 3).
2 Select address 51.
3 Open the top cover, remove the print drum, and release the cam
solenoid (SL4), as shown in the figure below.
4 Turn the gear train slowly, and watch the control panel display. The
status display will change from 000 to 001 when the cam home
sensor is activated.
If the home sensor reading does not change, check the following:
. The developer bias supply is fully seated.
. The cam home sensor is mounted in the printer frame correctly.
. The sensor connector is in good repair.
. If all of the above are okay, replace the sensor PS2. (See page 141
for the location of PS2.)
. When checking the cam home solenoid, run a demo page. With the
top cover removed, check that the solenoid releases. If it does not,
replace solenoid (SL4) and its clutch, and then check the cam timing
as shown in Chapter 6 of the printer service manual. |
Jim Goepel
| | Posted on Friday, August 16, 2002 - 11:49 pm: | |
Anyone know what might cause a Color LaserJet 5M to give an error message of "54.4 Engine Error"? I just purchased the unit used, and it appears to be DOA, although previous owner swears it worked. I am hopeful it is just something tweaked in shipping (like all the nasty toner that was spilled inside the printer) which I can easily clean or repair.
Any help would be appreciated! |
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