Audio Faults; 7.1 Uplink/Downlink Problem - Nokia Mobile Phones NSE-5 Series Service Manual

PAMS
Technical Documentation

7. Audio Faults

7.1 Uplink/Downlink Problem

Uplink and downlink are
broken
Voltage over C113
(HOOKDET) is 2.8V without
external audio devices
Yes
Voltage over C110
(HEADDET) is 2.8V without
external audio devices
Yes
Frequency at E200
(PCMSclk) is 8kHz square
wave logical level during call
Yes
Check for uplink and for
downlink broken
Issue 1 07/99
No
Check R113, R112,
C113
No
Check R110, R109,
R108, C110
No
Check N200
Figure 14.
NSE–5
Troubleshooting
Page 17