Xerox ColorQube 9303 Series Service Manual page 435

91A Printhead Communications RAP
This RAP gives additional information on printhead communication problems. Perform the
RAP for all current fault codes before this RAP is performed.
Initial Actions
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to GP 14. Disconnect the power cord. Electricity can cause
death or injury. Moving parts can cause injury.
Use care when opening the marking unit drawer when hot. Ink can spill from the ink reservoir
located at the back of the drawer if opened with too much force. Ink cross-color contamination
could also occur.
Do not touch the exposed face of the printheads. Surface contamination or minor damage can
destroy the printhead. Printheads must only be cleaned by a purge cycle.
• Check the harness leading to the indicated printhead.
• Check for damage to surrounding harnesses.
Procedure
Check that the ribbon cables connecting the printheads to the wave amp PWB and IME con-
troller PWB are securely connected and not damaged. Re-seat the ribbon cables as neces-
sary. The wiring is securely connected and undamaged.
Y N
Repair or replace the damaged cables as necessary,
Check and note the voltages at the test points on the IME controller PWB,
points read +3.2V.
Y N
• If any test point reads +2.1V install a new video cable,
cated printhead.
• If any test point reads 0V check the PEST error log for error 99-395-00. If error 99-
395-00 is found switch off the machine,
to the affected printhead, Figure
for the affected printhead. If the voltage is still 0V then install a new printhead,
91.20 Item 2, PL 91.25 Item 2.
NOTE: Ignore any error messages associated with the disconnected heater har-
ness.
• If any test point reads +0.3V go to
for the suspect printhead. Look for non responsive heaters, irregular temperature
fluctuations or other symptoms that would indicate a thermistor error on the print-
head. If necessary compare the results of the suspect printhead with temperatures
reported from a known good printhead. If thermistor errors are detected install a new
printhead, PL 91.20 Item 2, PL 91.25 Item
Check the system grounding, GP 7. The grounding is good.
ColorQube® 9303 Family
WARNING
CAUTION
CAUTION
REP 1.1.
Figure
PL 92.10 Item
GP 14, then disconnect the heater harness
2. Switch on the machine and check the test point
dC335 and check all set point mode temperatures
2.
Y N
Repair any grounding issues found,
Install new components as necessary:
• Printhead, PL 91.20 Item 2
• IME controller PWB,
• Quad wave amp PWB,
NOTE: Calibration of the registration / preheat assembly,
• The registration / preheat assembly is removed or replaced,
• The horizontal transport assembly is removed or replaced.
Calibration of the registration / preheat assembly is NOT required when:
• A printhead is replaced.
• The IOD assembly is removed or replaced.
1. All 4 test
7, for the indi-
PL
February 2013
2-411
GP 7.
or PL 91.25 Item 2.
PL 92.10 Item 1.
PL 92.10 Item 3.
dC625 is only required when:
Figure 1 IME controller PWB test points
Status Indicator RAPs
91A