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Level 3 Service Manual
6881039B10
•
If signal is coming out of AUDIOOUTP and AUDIOOUTM, check U1200
and the parts associated with A0A, A1 and A2 U1200 amplifiers.
•
If no signal is present at C1221 and C1212, either defective U1100 or
cold solder / missing power supply to U1100.
Troubleshooting the Internal Microphone
No TX audio with Internal Microphone
Prior to troubleshooting, check the microphone for proper connection. Temporarily
replace the microphone.
• Send the following test commands: 13K Loop back with internal speaker (sus-
pend, CP mode CDMA, AUD_LPB, Handset path, Audio_Level 3).
30000009000000360001000000
300000090000000A0001000001
30000009000000040001000003
3000000A00000006000200002200
30000009000000050001000003.
This is voice loop back enabling the internal microphone audio to be heard through
the internal speaker.
• If this test is passed, originate CDMA voice loop back call with the test set.
• If voice can't be heard while talking in to the microphone, U1100 or the modu-
lator/demodulator may be defective.
Troubleshooting the Headset Microphone
No Tx audio with Headset Microphone
Check the headset and J600 for proper connection.
• Send the following test commands: 13K Loop back with internal speaker (sus-
pend, CP mode CDMA, AUD_LPB, Handset path, Audio_Level 3)
30000009000000360001000000
300000090000000A0001000001
30000009000000040001000003
3000000A00000006000200004600
30000009000000050001000003.
This is voice loop back enabling the headset microphone audio to be heard through
the headset speaker.
October 04, 2001
Troubleshooting
69
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Table of Contents
Troubleshooting
