Operational Problems
3
-
26
Troubleshooting
Display
The following table covers problems that might arise with the LCD display.
Before replacing any parts, check to see if the cables and flex circuits are
properly connected. See "Servicing Notes" on page 4-1.
Table 3-12 Operational Problems - Display
Symptom
Possible Causes
Suggested solution
No response - all white or all black.
Contrast misadjusted.
Adjust contrast.
Control PCA failure.
Replace Control PCA.
Display failure.
Replace Display.
Display is blank but backlight works.
Bad connections involving Display
Data Cable.
1. Check/reseat data cable.
2. Replace data cable
Display failure.
Replace Display.
Control PCA failure.
Replace Control PCA.
Backlight doesn’t light in dark ambi-
ent conditions.
•
Display failure.
•
Control PCA failure.
•
Ambient light sensor failure.
Diagnose as follows:
In Diagnostic Mode, run Display
Test and press
BACKLIGHT ON
and
BACKLIGHT OFF
softkeys.
•
Backlight does not respond:
Replace 1) Display 2) Control
PCA.
•
Backlight responds normally:
test Ambient Light Sensor
(below).
In Diagnostic Mode, run Display
Test and check ambient light read-
ings.
•
Normal: Replace 1) Display 2)
Control PCA.
•
Abnormal or not responding:
Replace 1) Control PCA 2)
Interface PCA.
Contrast does not adjust for ambient
temperature.
Display failure.
Replace Display.
Control PCA failure.
Replace Control PCA.
Fails Display Test in Diagnostic
Mode (display problem other then
symptoms above).
Display failure.
Replace Display.
Control PCA failure.
Replace Control PCA.
Fails Display Test in Diagnostic
Mode (ambient light readings).
Control PCA failure.
Replace Control PCA.
Interface PCA failure.
Replace Interface PCA.
Fails Display Test in Diagnostic
Mode (backlight).
Display failure.
Replace Display.
Control PCA failure.
Replace Control PCA.
Summary of Contents for Heartstart XLT
Page 1: ...H E A R T S TA R T X LT S e r v i c e M a n u a l M 3 5 0 0 B M 5 5 0 0 B ...
Page 2: ......
Page 3: ...Service Manual M3500B HeartStart XLT M5500B Heartstart 4000 Defibrillator Monitor ...
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Page 224: ...M3500 90900 Printed in USA February 2003 Second Edition M3500 90900 2 ...