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5.6 TROUBLESHOOTING
5.6.1 Basic Troubleshooting Procedure
This procedure exercises everything in the printer except the interface to the host system. If any step
is not successfully executed, refer to the corresponding troubleshooting section.
1. Turn on printer power.
A) If nothing appears on the display, see 5.6.2.
B) If < > BAD is displayed, replace the indicated component on the main PCB or the
complete main PCB.
C) If CARRIAGE FAULT is displayed, see 5.6.6.
2. Press 12345678 and then CLEAR. Each number should appear in the display and then all
should disappear. If this does not occur or if diagnostics don't begin to execute in the next
step, see 5.6.3.
3. Execute 90 FUNCT diagnostics (see 3.6.2) and exercise the 7 sensors. If any sensor does
not operate, see 5.6.4.
4. Execute Local Printing (see 3.8) and use a 6" x 11" document.
A) If a document will not load into the printer, see 5.6.5.
B) If the carriage will not move across the document, see 5.6.6.
C) If no printing occurs, see 5.6.7.
D) If print quality is not acceptable, see 5.6.8.
E) For other possible problems, see 5.6.9. through 5.6.12
5.6.2 No Display
If nothing appears on the display on power up, check that:
1. The power switch on rear of printer is ON.
2. The input power cord is plugged into both printer and supply outlet.
3. The contrast knob to the left of the configuration label is set for good display contrast.
4. Input power is present on the input power cord.
5. The fuse on the Power Supply PCB is good.
6. The display cable is attached to the display and to the main PCB J11.
7. 38 VDC is present between main PCB J1 pins 1 and 5. If not, check for AC line voltage at
the Power Supply PCB input. If AC is present but 38VDC is not, replace the Power Supply.
9. If 38 VDC is present replace either the main PCB or the display module.
5.6.3 Defective Keypad
If keypad depressions are not sensed proceed as follows:
1. If a single key fails but all others are OK, just that key may be replaced after the keypad is
removed (see 5.5.4).
2. If a row or column of keys all fail, a key may be permanently depressed or the problem is in
the cable between the main PCB and the keypad or on the main PCB.
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