YOU WILL NEED:
1. Level I Tech Procedures for ImageWriter II
2. ImageWriter II User's Manual
3. Digital Multi-meter
BEFORE YOU START:
1. If a replacement module/part doesn't fix the problem, reinstall the
original module/part before continuing with the procedure.
2. For location of IW II parts, refer to the Level I Tech Procedures.
3. After each of the steps in this procedure, perform the IW II Self
Test to see if the problem has been repaired. To initiate Self Test
turn the printer off and press Form Feed while you turn it back on.
INSTRUCTIONS
1. To check the paper feed mechanism, insert paper, take off the top
cover, pull off the platen knob, check for obstructions in the gears,
and look to make sure the gears to the left of the platen mesh properly.
If defective module/parts are found, replace them.
2. Turn off the printer and check the Form Feed and Line Feed switches
on the operation panel as follows. If either proves defective, replace
the operation panel.
2.1 Set the digital multi-meter to measure 200 ohms resistance.
2.2 Place the probes on pin 12 and pin 13 of the operation panel
connector. The reading should show no connection (1).
2.3 Depress the Form Feed switch. The reading should show continuity
(0.00).
2.4 Place the probes on pin 11 and pin 13 of the operation panel
connector. The reading should show no connection (1).
2.5 Depress the Line Feed switch. The reading should show
continuity (0.00).
3. Replace the Drive PCB
4. Turn off the printer and check the paper feed motor as follows.
If it proves defective, replace it.
4.1 Set the digital multi-meter to measure 200 ohms resistance.
4.2 At the cable connector end (disconnected from the drive PCB),
check the resistance values between pins 6 and 4, 6 and 2, 5 and 1,
and 5 and 3 (pin 1 is the black wire). The value for each reading
should be approximately 22 ohms.
4.3 Check the resistance values between pins 3 and 1; and 2 and 4.
The value for each reading should be approximately 44 ohms.
5. Replace the Main CPU PCB.
PROBLEM/CURE:IMAGEWRITER II
--Line Feed Problems Cause Power Supply to Smoke--
PROBLEM DESCRIPTION: The line feed function is not working
properly (too much friction) and/or a component on the power
supply module may have burned up.
CAUSE: The line feed motor may have shorted a winding. This can
cause components on the power supply and the CPU PCBs to be
destroyed.
CURE: Remove the motor from the printer and try to turn its pulley.
Check for (a) and (b) below:
(a) "If the pulley turns hard", then the windings are burned
out so replace the bad line feed motor and recheck for the
problem.
-If the printer still does not work after the replacement
of the Line Feed motor, the original bad motor may have
damaged the Power Supply and CPU PCBs. In this case try
replacing one or the other or both of these modules.
(b) "If the pulley turns freely", then most likely the motor
is good. Inspect the Power Supply for burned components,
etc.
-If burned or discolored components are found on the Power
Supply, replace the Power Supply.
-If the Power Supply appears to be OK, replace the CPU PCB.
If the above cures don't fix the problem, search on GTS and the
product's name to obtain a general troubleshooting procedure.