IBM 6400 series Maintenance Manual page 123

Printer does not detect presence of power stacker
—or—
Stacker not operating
1. Check that the power stacker is enabled under the Printer Control menu. (Refer
to the Setup Guide .)
Enable the power stacker under the Printer Control menu. If the power
stacker enable/disable option does not appear in the menu, go to the
next step.
2. Open the rear cabinet door. Check that the ON/OFF indicator lamp is lit.
If the ON/OFF indicator is not lit, go to step 3.
If the ON/OFF indicator is lit, press the ONLINE key and check that the
ONLINE indicator lights. If the ONLINE indicator comes on, the stacker is
detected by the printer. If the ONLINE indicator does not come on, go to
step 4.
3. a) Power off the printer.
b) Unfasten the cable clamp holding the stacker control panel cables.
c) Disconnect the stacker power cable from the back of the stacker control panel.
(See Figure 61, page 380.)
d) Locate pin 1 of connector P106. (See the cable assembly drawing in Appendix
A, page 326.)
e) Power on the printer.
f) At connector P106 check for +48 volts DC between pins 1 and 2 and +5 volts
DC between pins 3 and 4.
If the voltages are correct, replace the stacker control panel. If the
voltages are not correct, power off the printer, remove the paper guide
assembly, and disconnect the stacker power cable from the CMX
controller board. (See Figure 66, page 384.) Check the continuity of the
stacker power cable between P105 and P106. If the cable fails the
continuity test, replace it. If the cable is OK, replace the CMX controller
board.
4. Power off the printer. Remove the paper guide assembly. Disconnect stacker
cables from the CMX controller board, stacker assembly, and the stacker control
panel (see Figure 61, page 380). Check cables for cuts, breaks, or damaged
pins. Check continuity of cables. (See Appendix A.)
Replace any cable that is damaged or fails continuity test. Reconnect all
stacker cables to the CMX controller board, stacker, and stacker control
panel.
5. Power on the printer. Check that the ONLINE indicators lights on the stacker
control panel.
Troubleshooting 123