Motorola ASTRO Digital Spectra Service Manual

6881076C25-D October 28, 2002
Troubleshooting Procedures: Power Amplifier Procedures 4-69
7 0 0 1.5 3.0 4.5
Power Set Buffer Out
801.33.56.0
Coupler Buffer Out
901.33.56.0
Forward Detect Voltage
10 0 0
Reflected Power Detect (not used)
11 0 1.3 3.5 6.0
Same as pin 8 (not used)
12 0 0 1.2 6.0
Thermister Buffer out (increases as PA gets hot)
13 0 0 1.2 6.0
Thermister Buffer in
14 5.0 5.0
5-V Sense Input (follows pin 20 ±0.1 V)
15 4.9 5.0 5.7 4.9 5.0 5.7
5-V Current Limit (limits at 5.7 V)
16 5.0 5.7 6.4 5.0 5.7 6.4
5-V Series Pass Drive (6.4 at max current)
17 9.5 9.6 9.9 9.5 9.6 9.9
9.6-V Sense Input
18 7 7
5-V Reg. Compensation Capacitor
19 5.7 5.7
N.C.
20 4.9 5.0 5.1 4.9 5.0 5.1
5-V Reference Input (UNSW5-V)
21 1.2 1.2
9.6-V Reg. Compensation Capacitor
22 0 0
N.C.
23 0.9 9.6 1.2 9.6
9.6V Series Pass Drive
24 2.9 3.3
Regulator Enable/Compensation
25 ——————
9.6-V Programming (N.C.)
26 0 0
N.C.
27 13.6 13.6
N.C.
28 ——————
9.6-V Programming (N.C.)
29 ——————
9.6-V Programming (N.C.)
30 ——————
9.6-V Programming (N.C.)
31 0 0 0 0 0 0
Ground
32 10.8 13.6 16.5 10.0 13.0 16.0
Decoupled A+
33 4.0 5.0 0 0.2
TX PA Enable (from U520-25)
34 0 1.3
Control AMP one-shot
35 0 0
Lock (5-V of Synth Out of Lock)
Table 4-24. Power Control DC Voltage Chart (Continued)
LOCATION
RX MODE TX MODE
COMMENTS
LOW TYP HI LOW TYP HI

Motorola ASTRO Digital Spectra Specifications

General

Brand	Motorola
Model	ASTRO Digital Spectra
Category	Radio
Language	English