9-12
Schematics, Board Overlays, and Parts Lists – UHF
: Transceiver (RF) Section
May 28, 2008
6871620L01-C
Figure 9-11. UHF Frequency Generation Unit (RX VCO) Circuit – 3 of 3
VCTRL
C295
2113944A42
150pF
4815002H01
D251
L251
680nH
2416307H01
4815002H01
D252
D254
4815002H01
D253
4815002H01
C257
2113944A80
L252
2415427H37
20pF
36nH
2113944A42
68pF
C259
2113944A36
C255
150pF
4871915M01
Q251
C251
2113944A23
8
.
2pF
680nH
2416307H01
L254
180
0613952Q55
R256
2471912M01
L253
I
DCTR
11
.
7nH
C256
15pF
2113944A27
15pF
C258
2113944A27
R252
0613952Q96
9
.
1K
2113944A26
C252
12pF
C254
2113946B04
0
.
1uF
1
.
5pF
C253
2113944A05
L255
2416307H01
680nH
0613952Q96
9
.
1K
R253
2113944A42
2416307H01
150pF
C261
680nH
L256
C260
2113944A73
8pF
C263
150pF
2113944A42
R257
0613952Q43
56
2
.
2pF
2113944A09
C264
0
.
1uF
C262
2113946B04
100
0613952Q49
R269
NP
150pF
C266
2113944A42
100pF
2113944A40
C265
2113944A79
C268
16pF
2113944A23
8
.
2pF
C267
R262
0613952Q85
3
.
3K
4885061Y01
Q252
0613952Q88
4
.
3K
R260
2416307H01
L257
680nH
2415427H33
L258
24nH
R261
100
0662057M50
R263
0613952Q56
200
Rx_VCO_Out
RXLO
PRES_RX_
I
N
100pF
C296
0
.
1uF
C269
2113946B04
VSF_VCO
AUX2
4815055H01
UMC5NT2G
4
.
7K
47K
47K
10K
Q253
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......