Tait TM8100 mobiles, Service Manual

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TM8100/TM8200 Service Manual CODEC and Audio Fault Finding 421
© Tait Electronics Limited November 2007
Task 16 —
Check CODEC 2
Device
If the DC offset measured in Task 15 is incorrect but there is no fault with
the auxiliary connector, check the CODEC 2 device.
1. Remove the
CDC TOP
can.
2. Check the voltage at both ends of R241 (see Figure 13.10 ):
3. If the voltages are correct, go to Step 4 . If they are not, go to Step 6 .
4. Check for and repair any soldering faults around IC205 , or else
replace IC205 (see Figure 13.10 ).
5. Confirm the removal of the fault and go to “Final Tasks” on
page 163 . If the repair failed, replace the board and go to “Final
Tasks” on page 163 .
6. Remove R241 .
7. Check the voltage at pin 3 of IC205 (see Figure 13.10 ):
8. If the above voltage is correct, go to Step 9 . If it is not, replace the
board and go to “Final Tasks” on page 163 .
9. Check for and repair any soldering faults around R241 and IC205
(see Figure 13.10 ).
10. Confirm the removal of the fault and go to “Final Tasks” on
page 163 . If the repair failed, replace the board and go to “Final
Tasks” on page 163 .
R241: 1.5V DC at both ends
pin 3 of IC205: 1.5V DC