Tait TM8100 mobiles Service Manual page 415

Figure 13.8 Circuitry in the vicinity of the
Junction of
C708 and C732
Task 11 —
Check Test Point
QN
TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
CDC TOP
If the level shifter is not faulty, check the signal at the
ascertain whether the digital board, CODEC 1, or the receiver is at fault.
1. Use the programming application to find the frequency selected for
channel 1.
2. Apply a strong on-channel signal.
3. Check that a sine wave is present at the
through a hole in the
QN test point: sine wave
4. If there is a sine wave present, go to
"Receiver Fault Finding" on page
5. Either the digital board or CODEC 1 (IC204) is faulty; replace the
board and go to
can (UHF shown)
can — see
IF TOP
Step
247.
"Final Tasks" on page
CODEC and Audio Fault Finding
test point. This will
QN
test point (there is access
QN
Figure 13.8).
5. If there is not, go to
163.
415