TAG 753: External Communications Malfunction
June 1999 Troubleshooting Analysis Guide (TAGs) 3-143
3
Turn off the printer and unplug the power cord.
• Remove fuse FH2, which is mounted to the signal interface board, and check for continuity.
Is there continuity?
No: Install a new fuse and retest. If the fuse is okay, turn to TAG 002: Check & Problem Res-
olution. If the new fuse fails, replace the signal interface board or attachment option and
install a new fuse, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
4
Disconnect the interface cable from the printer.
• Disconnect any attachment option.
• Install the RS-232C and RS-422 wrap connectors.
• Run diagnostic test 103.
Did the diagnostic test run properly?
No: Continue.
Yes: Go to #11 in this TAG.
5
Turn the printer off and unplug the power cord.
• Inspect J/P71 (RS-232C), J/P72 (RS-422), and J/P74 for connector body cracks or damaged
pins.
Is there a problem with the connectors or pins?
No: Go to #7 in this TAG.
Yes: Continue.
6
Replace the signal interface board.
• Run diagnostic test 103.
Did the diagnostic test run properly?
No: Continue.
Yes: The signal interface board was at fault. Turn to TAG 002: Check & Problem Resolution.
7
Open the back cover and install an interlock by-pass tool.
• Power-on-reset the printer.
• Check J/P32-10 for +12 Vdc.
Is the voltage +12 Vdc?
No: Repair or replace the connectors or wiring from P8-6 to P32-10, then turn to TAG 002:
Check & Problem Resolution.
Yes: Continue.
8
Check J/P32-3 for -12 Vdc.
Is the voltage -12 Vdc?
No: Continue.
Yes: Replace the signal interface board, then turn to TAG 002: Check & Problem Resolution.
If this does not resolve the problem, replace the IGS board, then turn to TAG 002: Check
& Problem Resolution.
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