Preview Display And Logic (M1700A) - HP PageWriter XL M1705B Service Manual

Table t-7. Preview Display and Logic (M1700A)
Symptom
Washed out display.
Cause Corrective Action
Improper brightness or contrast
Adjust brightness and contrast controls
adjustment or both.
for best display appearance.
411 white screen, backlights on. Contrast or brightness or both
misadjusted.
Adjust contrast or brightness or both.
Interconnect cable between preview Check that plug is fully connected.
logic and display unplugged or Replace cable if defective.
defective.
Defective preview logic board.
Replace board.
Defective preview power supply Replace board.
board.
Defective LCD module. Replace LCD module.
Missing supply voltages to power Verify presence of VCC and VIN at
supply and LCD module.
input to power supply board. Refer to
Appendix A for pin assignments.
Verify presence of VCC, VLCD, VCFL
at power supply board output.
Vo brightness adjust.
Defective brightness potentiometer
Replace power supply board.
or defective power supply board.
qo contrast adjust.
Defective contrast potentiometer or
Replace power supply board.
defective power supply board.
411 black screen.
411 blue screen.
Contrast or brightness misadjusted.
Adjust contrast.
Defective preview logic board. Replace board.
Defective LCD module.
Replace display assembly.
Defective CPU assembly.
Replace CPlJ assembly.
Defective preview logic board.
Replace board.
Defective preview power supply
Replace board.
board.
Screen is blank.
M1701A software loaded on an
M1700A.
Load correct software.
Troubleshooting 6-19