Motorola ASTRO Digital Spectra Plus Detailed Service Manual page 211

Troubleshooting Procedures: Power Amplifier Procedures
RX MODE
LOCATION
LOW
7
8
9
10
11
12
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
6881076C25-E
Table 4-24. Power Control DC Voltage Chart (Continued)
TX MODE
TYP HI LOW TYP
0 0 1.5 3.0
0 1.3 3.5
0 1.3 3.5
0
0 1.3 3.5
0 0 1.2
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
HI
4.5
Power Set Buffer Out
6.0
Coupler Buffer Out
6.0 Forward Detect Voltage
0 Reflected Power Detect (not used)
6.0
Same as pin 8 (not used)
6.0
Thermister Buffer out (increases as PA gets hot)
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 (UNSW5-V)
9.6-V Reg. Compensation Capacitor
0 N.C.
9.6
9.6V 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)
COMMENTS
September 5, 2008
4-69