Chapter 6 Troubleshooting and on-board repair
MDC-2200/2500 Series
6-10
0092625002-07
6.3.2.3 No display
Main logic PCB failure
Press [Brilliance] key, turn EBL
(EBL/VRM) knob to clockwise
with observing brilliance control
window to maximize bar graph.
Exchange cathode
luminescent lamp (CFL)
Backlight power source failure
Is brilliance control of
display set to maximum?
Is backlighting of the LCD
display lit?
Is LCD module and main
logic PCB connection
[J704] normal?
Are all status indicator
LED’s on the main logic
PCB flashing?
Failure of the LCD unit
Main logic PCB failure
Yes
No
Yes
No
Connection failure
No
Is cathode
luminescent lamp
(CFL) bad?
Yes
Is backlight power
source normal
(+12 V)?
No
Yes
No
Yes
Yes
No
Summary of Contents for MDC-2200 series
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