Tait TB7100, Руководство по обслуживанию

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TB7100 Service Manual CODEC and Audio Fault Finding 367
© Tait Electronics Limited October 2005
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 15.10 ):
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 15.10 ).
5. Confirm the removal of the fault and go to “Final Tasks” on
page 123 . If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 123 .
6. Remove R241.
7. Check the voltage at pin 3 of IC205 (see Figure 15.10 ):
8. If the above voltage is correct, go to Step 9 . If it is not, replace the
main-board assembly and go to “Final Tasks” on page 123 .
9. Check for and repair any soldering faults around R241 and IC205
(see
Figure 15.10 ).
10. Confirm the removal of the fault and go to “Final Tasks” on
page 123 . If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 123 .
R241: 1.5V DC at both ends
pin 3 of IC205: 1.5V DC