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Table 3-12 Operational Problems - Display (Continued)
Symptom
Fails Display Test in Diagnostic
Mode (indicator LEDs).
Table 3-13 Operational Problems - Audio Tones/Voice Prompts
Symptom
No audio at all.
Audio is distorted.
Buzzing noise when audio active.
Tones present but no voice prompt
(in AED Mode).
Voice prompt present but no tones.
M3500B/M5500B Service Manual
Possible Causes
Control PCA failure.
Manual Keypad failure.
Audio
The following table covers problems that might arise with the audio tones or
voice prompts. 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
Speaker failure.
Control PCA failure.
Damage to speaker label.
Speaker failure.
Control PCA failure.
Damage to speaker label.
Debris between speaker and
speaker label.
Speaker hardware loose.
Speaker failure.
Control PCA failure.
Control PCA failure.
Control PCA failure.
Operational Problems
Suggested solution
Replace Control PCA.
Replace Manual Keypad.
Suggested solution
Replace Speaker Assembly.
Replace Control PCA.
Replace speaker label.
Replace Speaker Assembly.
Replace Control PCA.
Replace speaker label.
Remove speaker label, clean out
debris, install new speaker label.
Tighten hardware as needed.
Replace Speaker Assembly.
Replace Control PCA.
Replace Control PCA.
Replace Control PCA.
3
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