Specifications

3–23Troubleshooting
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 XON/XOFF if
possible; this requires the least complex cable.
d. If the printer prints from the host, but occasionally loses blocks
of data, the most likely cause is the host not responding to “send
no more data” signals from the printer. With a Centronics
interface, this means the host is ignoring BUSY; in RS–232, the
host is ignoring the XOFF character or “Data Terminal Ready”
(pin 20). Sometimes the cable is not conveying the necessary
signals. Test this by using a serial line analyzer and software or
test equipment that displays the data and handshake lines of the