Motorola V200 Service Manual page 28

Troubleshooting
24
Loopback (Boom Mic Speaker)
• Select the SUSPEND button to put the phone into Suspend Mode.
• Select CDMA 800 button under CP_MODE to put the UUT in 800 CDMA
Mode.
• Under AUD_PATH command, set Input to 4 and Output to 6 to route Audio to/
from Headset Jack. Under the AUD_LPB heading, select Vocoder 13K (CDMA)
button to put the phone into full rate loopback mode.
• Set AUD_LVL to level 3.
• See Figure 7.
• Connect the audio out (boom speaker) of the boom/audio plug through a 32
Ohm resistor to boom ground.
• Inject an audio tone of 1004Hz at 2.2 mVrms into the audio in (boom mic).
within the specifications listed in Table 3
Table 3. Loopback Test Values
Parameter
Mic bias
Loopback
Jack sense
Headset jack ground sense
• Set test set to 50Hz High Pass, 15KHz Low Pass filtering with de-emphasis
turned OFF. Measure the RMS audio signal at the audio out (boom speaker).
The result should be within the specifications listed in Table 3.
October 04, 2001
.
Lower Limit
2.0 Vdc
28.2 mVac
1
1
CDMA V200
Upper limit
2.6 Vdc
56.4 mVac
1
1
6881039B10