Check Itf Rx Beep In Input Signal - Tait TM9100 Service Manual

If the output of the voice-band CODEC is not correct, check the
Task 7 —
Check
ITF RX BEEP IN
ITF RX BEEP IN
Input Signal
1.
2.
3.
4.
5.
TM9100 Service Manual
© Tait Electronics Limited August 2005
signal.
If not already done, remove the
Check the signal at the junction of R218 and IC204
(see Figure 13.4). The signal should be:
junction of R218 and IC204: sine wave about 1V
If the signal is correct, go to
(IC204) or the digital board is faulty; replace the main-board
assembly and go to "Final Tasks" on page
Check for continuity between the
R214, R215 (see Figure
Repair any fault; if necessary, replace R214, R215 or R218.
Confirm the removal of the fault and go to
page 147. If the repair failed or the fault could not be found, replace
the main-board assembly and go to
can.
CDC BOT
with 1.2V DC offset
pp
Step 4. If it is not, either CODEC 1
147.
200 test point and IC204 via
TP
13.2) and R218 (see Figure
"Final Tasks" on
"Final Tasks" on page
CODEC and Audio Fault Finding
13.4).
147.
381