Specifications

4–23Troubleshooting
a. If the display is blank, or has a single line of black squares across
the top, the connector to the control panel probably needs to be
plugged in or reseated. Turn off the printer, plug in the panel cable to
connector J3 on the CCB, and start over at step 1. If the display is
still blank, or has a black line, and the DPU LED lights and turns off,
the control panel or its cable are defective.
b. If the display reads “Mech Driver Link,” the 8032 at location J12
on the CCB may have failed. Check the 8032 and its PROM at
location J10 for bent pins, misalignment, or backwards insertion.
Also, make sure the clock–test jumper E2 at location J14 is installed.
If everything appears okay, try reseating the PROM at location J10,
the 8032 at J12, the clock jumper at J14, and the connector at
J2—sometimes this message is caused by a failure to communicate
with the 8032 on the Mech Driver board.
If the problem persists, check the Mech Driver 8032, its clock
jumper, and the PROM. Look for backwards insertion, misalignment,
etc., and try reseating the parts. (NOTE: On some Mech Driver
boards, the 8032 PROM correct orientation may be upside down in
relation to the rest of the board. On these boards, the silk–screen will
show the correct orientation.) Always replace PROMs and parts that
were inserted backwards.
If the problem persists, replace the 8032 PROMs on the CCB and
Mech Driver boards. If the problem persists, replace the CCB/Mech.
Driver interconnect cable. (See Appendix A.)
c. If the printer appears normal, but does not print from the host,
check the data cable to the host and reseat the cable that attaches to
J1 of the CCB and A12. Then make sure the correct interface is
selected and configured from the control panel. (Refer to the Setup
Guide or User’s Manual.) Save the configuration and reset the
printer.
If the printer is running RS–232, interchange the wires to pins 2 and
3. This is the most common cause of a completely inoperative
RS–232 cable. Make sure the printer and host have the same baud
rate and parity. In RS–232, configure the host for XON/XOFF if
possible; this requires the least complex cable.