3–23Troubleshooting
5. The 68010 LED turns on, then off, but the printer doesn’t work. Look at
the control panel display:
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 68010
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
interconnect cable W1. (See Appendix D.)
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. (See
Appendix A.) 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
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