Table 6-2. Tx And Rx Audio Path Test Points For 1 Khz Sine Wave - Motorola ASTRO XTL 1500 Detailed Service Manual

Troubleshooting Waveforms: XTL 1500 Waveforms

Table 6-2. 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
TP0201 Preamp in, attn.-out
U0201-1 1st op amp out
TP0202 2nd op amp in
U0201-7 2nd op amp out
U0201-8 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
6815854H01-A
(for VHF, UHF R1 and 700/800 MHz)
Typical
mV RMS
80 mV
80 mV
43 mV
3
42 mV
3
41 mV
41 mV
40 mV
39 mV
38 mV
36 mV
150 mV
3
150 mV
318
318
39
5
7.74 Vbtl
5
7.74 Vbtl
O-Scope Measured mV p-p
1
mV/div LL
20 226
20 220
10 100
10 97
10 97
10 94
10 91
10 88
10 85
10 82
50 400
50 400
500 849
500 849
10 92
2 V 9.5 Vpp
2 V 9.5 Vpp
6-13
Volts
2
UL DC Bias
227 3 to 9
227 1.42
122 1.42
121 1.42
121 1.42
120 1.42
119 1.42
118 1.42
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+
June 15, 2005