IBM 6400 series Maintenance Manual page 119

Using a feeler gauge, adjust the gap between the MPU assembly and the
flywheel to 0.010
MPU clamp screw to 18
5. Power up the printer. Run a print test.
If the symptom is not gone, replace the MPU.
6. Power up the printer. Run a print test.
If the symptom is not gone, replace the CMX controller board.
7. Power up the printer. Run a print test.
If the symptom is not gone, replace the shuttle frame assembly.
No power, and the operator panel is blank, and the card cage fan is not running
1. Check that the AC power outlet has power.
Restore AC power.
2. Unplug the printer AC power cord from the printer (leave it plugged into the
power outlet) and check for AC power at the printer end of the cord.
If there is no power through the AC power cord, replace it. Plug the AC
power cord into the printer and power outlet.
3. Remove the paper guide assembly or pedestal top cover. Verify that the AC-in
power cable and the AC power input cables are connected to the on/off
switch—circuit breaker. (See Figure 51, page 287.)
Connect the AC-in power supply cable and AC power input cables to the
on/off switch—circuit breaker. Make sure all ground connections are
clean and tight.
4. Check that AC-in power cable connector P1 is connected to J1 on the power
supply board.
Connect AC-in power cable connector P1 to J1.
5. Check that power supply cable connector P101 is connected to J101 on the CMX
controller board.
Connect power supply connector P101 to J101 on the CMX controller
board.
6. Check all cable connections on the CMX controller board.
Connect all cables.
Troubleshooting
.001 inch (0.254 0.025 mm). Torque the 7/16 inch
1 inch-pounds (2.03 0.11 N m).
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