Motorola ASTRO Digital Spectra Plus Service Manual page 190

4-50
RX MODE
LOCATION
LOW TYP
J1
16 5.0
17 9.5
18
19
20 4.9
21
22
23
24
25 v
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
41 0
42
43
October 28, 2002
Table 4-17. Power Control DC Voltage Chart (Continued)
TX MODE
HI LOW TYP
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
0 0 0
0 2.2
1.3 7.0
Troubleshooting Procedures: Power Amplifier Procedures
HI
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 (UNSW5-V)
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)
0 0 Ground
9.6 Control AMP Output (Approx 1/2-V Control)
Loop Integrator Capacitor
COMMENTS
6881076C25-D