29 Oct
2013
29 Oct
'13
3:50 p.m.
The Service Manual at www.lbrty.com says:
"55 SERVICE" Initialization Error
The "55 Service" error indicates that the printer failed to initialize
correctly at power ON. This means that the Formatter cannot
communicate with the engine in order to establish the initial
condition of the engine. This problem can be caused by a bad
Formatter, bad cable, or by problems with the line voltage. Check and
reseat connectors J4 and J5 on the DC Power Supply, and J8, J9, and
JIO on the DC Controller PCA. Cycle the power several times to clear
the error or to get another error that may better indicate the cause
of the problem. If this clears the error, run an engine test print. If
the error persists, replace the Paper Pickup PCA, the DC Controller
PCA, the DC Power Supply PCA, the Formatter PCA. Finally, replace the
Paper Input Unit. If these fail to correct the problem, check all
associated cahles for damage and replace if required. Any 57.1 Main
Motor problem can also cause this error.
In other words replave most of the electronics in the printer until the
fault appears to go way. Without knowing what as actually fialed, without
knowing why it was cured,
And this is suypposed to be a sensible method of fixing soemthing???
I don't have a laser printer as modern as this one, but on the older ones
I would start (as ever) by checking all the power supply votlages. Then
check to see fi the microcotnroller(s) on the DC controlelr board
('engine controller') are running at all. Check to see if the main motor
is beign driven. If not, find out why not. Perhaps safety interlock has
not closed or something.
It is useful to know what all the external connectiosn to the DC
controller are (this is presumably not in the manual :-(). I figured them
al lotu for the CX and SX printers. Then, you can see what the DC
controller is trying to do (start the scanner motor, drive the main
motor, drive the laser, etc) and see if ti gets the right responses back.
If it starts the scanenr and doesn't get the 'up to speed' signal, it
will give an erorr. But f you know the signals, you can see that the
scanner motor should be running and see that the up-to-speed signal is
nto asserted. Then you can find out _why_
Certainly on the older printers, the printer will initialise and respond
to the 'test print' switch without a formatter board. So I think that if
the unit is not doing the normal startup motor sequence, the problem is in
the print engine.
-tony