Figure 4-6. Pa Test Adapter, 50 Watt Power Amplifier; Table 4-15. Power Control Dc Voltage Chart - Motorola ASTRO Digital Spectra Service Manual

4-40
8. If no failure is located from the previous checks, troubleshoot the power control circuitry.
A+ TO COMMAND
CURRENT SENSE +
CONTROL VOLTAGE LIMIT
CONTROL VOLTAGE DRIVE
RX MODE
LOCATION
LOW
1 —
2
3
4 10.8 13.8
5 0
6 10.8 13.8
7
8 —
9
10 10.8 13.8
11 9.4
12 10.8
1 0
2
July 1, 2002
BOARD
2
1
3
K9.4

Figure 4-6. PA Test Adapter, 50 Watt Power Amplifier

Table 4-15. Power Control DC Voltage Chart

TX MODE
TYP HI LOW TYP
— — — —
0 0 2.0
0 2.0 7.0
16.6 10.4 13.4
0 0 9.2 9.4
16.6 10.4 13.4
0 1.2
— — — —
0 1.5 3.5
16.6 10.4 13.4
9.6 9.9 9.4 9.6
9.8 13.1
0 0 0
0 3.2
Troubleshooting Procedures: Power Amplifier Procedures
4 8
6
10 12
5 11
9
7
HI
P0853
— Key (no pin or wire)
3.2 Control Voltage Limit
9.2 Control Drive Voltage
16.2
Current Sense +
9.8 Keyed 9.4
16.2 A+ to Command Board
Temp Sense (cutback begins at 3.3 V)
v
Key (no pin)
5.0 Forward Detect Volt
16.2 A+ to Command Board
9.9 9.6-V Supply from Command Board
15.9
Current Sense - (voltage delta 150 mV)
U0500
0 0 Ground
Control AMP Input
A+ TO COMMAND BOARD
CURRENT SENSE -
FEMALE RECEPTACLE
CONNECTOR W 100 MIL
SPACING MATES TO P853
REGULATED 9.6V
V DETECT
TEMP SENSE
COMMENTS
68P81076C25-C