Tait TP9100 - Page 276

276 CODEC and Audio Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
12. If the audio PA outputs are correct, the fault is unknown (and could
be intermittent); go to “Final Tasks” on page 134. If the repair failed,
replace the main board and go to “Final Tasks” on page 134.
To check external speaker operation:
1. Disconnect the internal speaker.
2. In user mode apply an on-channel RF FM signal of –47dBm with
60% deviation, 1kHz tone. The channel must not have signaling
enabled. Set the volume to maximum.
3. Check the positive and negative audio PA outputs at pins 5 and 8 of
IC200 (see Figure 12.1):
4. If the audio PA outputs are correct go to Step 7. If they are not go to
Step 5.
5. Check for and repair any soldering faults around IC200
(see Figure 12.1), or else replace IC200
6. Confirm the removal of the fault and go to “Final Tasks” on
page 134. If the repair failed, replace the main board and go to “Final
Tasks” on page 134.
7. Check accessory speaker connection pins for
ACC+SPKR and ACC–SPKR
and accessory flex as described in “Accessories Interface Faulty” on
page 147.
8. Confirm the removal of the fault and go to “Final Tasks” on
page 134. If the repair failed, replace the main board and go to “Final
Tasks” on page 134.
9. With the volume at maximum, check the positive and negative audio
PA outputs at pins 5 and 8 of IC200 (see Figure 12.1):
10. If the audio PA outputs are correct, the fault is unknown (and could
be intermittent); go to “Final Tasks” on page 134. If the repair failed,
replace the main board and go to “Final Tasks” on page 134.
pin 5 of IC200: approximately half of +7V5 BATT
pin 8 of IC200: approximately half of +7V5 BATT
pin 5 of IC200: approximately 5.5Vpp AC
pin 8 of IC200: approximately 5.5Vpp AC