6815854H01-A
June 15, 2005
Troubleshooting Waveforms:
XTL 1500 Waveforms
6-13
Table 6-2. TX and RX Audio Path Test Points for 1 kHz Sine Wave
(for VHF, UHF R1 and 700/800 MHz)
Typical
O-Scope
Measured mV p-p
Volts
Test Point
Description
mV RMS
mV/div
LL
1
UL
2
DC Bias
TX Audio Path
MIC_HI
80 mV RMS input
80 mV
20
226
227
3 to 9
TP0200
MIC_PREAMP_IN
80 mV
20
220
227
1.42
TP0201
Preamp in, attn.-out
43 mV
10
100
122
1.42
U0201-1
1st op amp out
3
42 mV
10
97
121
1.42
TP0202
2nd op amp in
3
41 mV
10
97
121
1.42
U0201-7
2nd op amp out
41 mV
10
94
120
1.42
U0201-8
3rd op amp and filter out
40 mV
10
91
119
1.42
U0201-14
4th op amp and filter out
39 mV
10
88
118
1.42
TP0203
CODEC op amp in
38 mV
10
85
117
1.42
U0200-17
Buffered CODEC in
36 mV
10
82
116
1.42
C0904
5 CF Out
150 mV
50
400
700
1.42
R6782
MOD_IN at 3 kHz dev.
3
150 mV
50
400
700
1.5
RX Audio Path
4
TP0204
RX_FILT_AUDIO
318
500
849
953
1.42
TP0205
RX_AUDIO_IN
318
500
849
953
1.42
TP0206
AUDIO_PA_IN
39
10
92
130
1/2 A+
SPKR+
NON INVERTED PA out
7.74 Vbtl
5
2 V
9.5 Vpp
12.4 Vpp
1/2 A+
SPKR-
INVERTED PA out
7.74 Vbtl
5
2 V
9.5 Vpp
12.4 Vpp
1/2 A+
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
Содержание XTL 1500
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Страница 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 225: ...June 15 2005 6815854H01 A 5 64 Troubleshooting Charts Flowcharts Notes ...
Страница 429: ...8 2 Flex Cable Pin Out Lists Flex Cables June 15 2005 6815854H01 A Notes ...
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