Page 56 of 92
Chapter: 6. Trouble Shooting
Symptom Cause Remedy
Basic System Integrity
No picture on LCD screen. 1. No AC or DC power to the system.
2. System is in standby mode.
3. Too low screen contrast.
4. Defective LCD module.
5. Voltage(s) out of range.
1. Check switches and fuses on the
terminal board inside the DL850
cabinet.
2. Press any button on the panel.
3. Increase contrast settings or replace
keyboard PCB.
4. Replace LCD module.
5. Replace terminal board.
Display backlight malfunctions.
Display picture is hardly visible.
1. DL850 initialization.
2. Defective backlight tubes.
3. Defective backlight inverter PCB.
1. Turn o power and wait for 5 sec
before restart.
2. Replace backlight tubes.
3. Replace backlight inverter PCB.
Rotary encoder malfunctions. 1. Defective encoder or interface.
2. SW problem.
1. Replace keyboard PCB.
2. Recycle power/do a “factory reset”.
Panel buttons malfunctions. 1. Defective buttons or interface.
2. One button stuck.
3. SW problem.
1. Replace keyboard PCB or I/O PCB.
2. Check key switch(es) or replace
keyboard PCB.
3. Recycle power/do a “factory reset”.
Loose user setup and calibration
data.
1. Battery backup not enabled.
2. Battery at.
1. See “Back-up Battery Jumper JP200”
on page 39 for details.
2. Replace battery or I/O board.
Ambient t in status screen shows too
high.
1. Obstructed air ow.
2. Defective fan.
1. Check installations for obstructions
of vent holes.
2. Replace fan.
6. Trouble Shooting
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