Motorola ASTRO Digital Spectra Service Manual page 156

4-24
RX MODE
LOCATION
LOW
J1
13
14
15 4.9
16 5.0
17 9.5
18
19
20 4.9
21
22
23
24
25 -
26
27 13.6
28 -
29 -
30 -
31 0
32 10.8 13.6
33 4.0
34
35
36
37 10.8 13.6
38 10.8 13.6
39
40 1.5
July 1, 2002
Table 4-8. Power Control DC Voltage Chart (Continued)
TX MODE
TYP HI LOW TYP
0 0 1.2
5.0 5.0
5.0 5.7 4.9 5.0
5.7 6.4 5.0 5.7
9.6 9.9 9.5 9.6
7
5.7 5.7
5.0 5.1 4.9 5.0
1.2 1.2
0
0.9 9.6 1.2
2.9 3.3
- - -
0
13.6
- - -
- - -
- - -
0 0 0
16.5 10.0 13.0
5.0
0 1.3
0
0 0.8
16.3 10.0 13.0
16.3 10.0 13.0
0 9.2 9.4
3.0 4.5 1.5 3.0
Troubleshooting Procedures: Power Amplifier Procedures
HI
6.0 Thermister Buffer in
5-V Sense Input (follows pin 20 ±0.1 V)
5.7
5-V Current Limit (limits at 5.7 V)
6.4 5-V Series Pass Drive (6.4 at max current)
9.9 9.6-V Sense Input
7 5-V Reg. Compensation Capacitor
N.C.
5.1 5-V Reference Input (UNSW5V)
9.6-V Reg. Compensation Capacitor
0
N.C.
9.6
9.6-V Series Pass Drive
Regulator Enable/Compensation
- - 9.6-V Programming (N.C.)
0
N.C.
N.C.
- - 9.6-V Programming (N.C.)
- - 9.6-V Programming (N.C.)
- -
9.6-V Programming (N.C.)
0 0 Ground
16.0 Decoupled A+
0 0.2 TX PA Enable (from U520-25)
Control AMP one-shot
0 Lock (5 V of Synth Out of Lock)
Control AMP one-shot
16.0 A+ (Current Sense +)
16.0
Current Sense - Voltage Delta 150 mV
9.8 Keyed 9.4-V in
4.5 Current Limit D-A (max current at 4.5 V)
COMMENTS
68P81076C25-C