Philips HEARTSTART XLT Service Manual page 80

Operational Problems
Table 3-14 Operational Problems - Keys
Symptom
ON
key doesn't respond.
One or more of the Main Keys fails
OFF, 1, 2, 3
to respond ( ).
One or more of the other keys don't
respond (display controls, printer
controls, manual/pacing).
Fails Controls Test in Diagnostic
Mode
3-28
Keys
The following table covers problems that might arise with the keypads.
Before replacing any parts, check to see if the cables and flex circuits are
properly connected. See "Servicing Notes" on page 4-1.
Possible Causes
• Key failure.
• Interface PCA failure.
• Control PCA failure.
• Key failure.
• Interface PCA failure.
• Control PCA failure.
See symptoms above.
Suggested solution
Refer to Table 3-1 "Unit Unrespon-
sive".
Diagnose as follows:
In Diagnostic Mode, run Controls
test and identify all unresponsive
keys.
• Some keys don't respond:
Replace 1) Control PCA 2)
Interface PCA 3) Top Case
Assembly.
• All keys don't respond: Replace
1) Control PCA 2) Interface
PCA
Diagnose as follows:
In Diagnostic Mode, run Controls
test and identify all unresponsive
keys.
• Some keys don't respond:
Replace 1) Interface PCA 2)
Control PCA 3) Top Case
Assembly.
• All keys don't respond: Replace
1) Interface PCA 2) Control
PCA.
Troubleshooting