Table 6-3. Tx And Rx Audio Path Test Points For 1 Khz Sine Wave - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

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Table 6-3. TX and RX Audio Path Test Points for 1 kHz Sine Wave

Test Point Description
TX Audio Path
MIC_HI 80 mV RMS input
TP0200 MIC_PREAMP_IN
U0201-8 1st op amp out
U0201-7 2nd op amp out
U0201-1 3rd op amp and filter out
U0201-14 4th op amp and filter out
TP0203 CODEC op amp in
U0200-17 Buffered CODEC in
C0904 5 CF Out
R6782 MOD_IN at 3 kHz dev.
4
RX Audio Path
TP0204 RX_FILT_AUDIO
TP0205 RX_AUDIO_IN
TP0206 AUDIO_PA_IN
SPKR+ NON INVERTED PA out
SPKR- INVERTED PA out
1
LL = lower limit
2
UL = upper limit
3
Measurement depends on tuning parameters
4
1 kHz tone at 3 kHz deviation, -47 dBm
5
"btl" = bridge to load
May 25, 2005
(for all High Power and Mid Power R2)
Typical
mV RMS
80 mV
80 mV
3
0 mV
80 mV
80 mV
80 mV
36 mV
36 mV
150 mV
3
150 mV
318
318
39
5
7.74 Vbtl
5
7.74 Vbtl
Troubleshooting Waveforms: XTL 5000 Waveforms
O-Scope Measured mV p-p
1
mV/div LL
20 226
20 220
10 0
10 210
10 210
10 210
10 85
10 82
50 400
50 400
500 849
500 849
10 92
2 V 9.5 Vpp
2 V 9.5 Vpp
Volts
2
UL DC Bias
227 3 to 9
227 2.5
10 2.5
227 2.5
227 2.5
227 2.5
117 1.42
116 1.42
700 1.42
700 1.5
953 1.42
953 1.42
130 1/2 A+
12.4 Vpp 1/2 A+
12.4 Vpp 1/2 A+
6881096C74-B