Service manual

July 1, 2002 68P81076C25-C
4-58 Troubleshooting Procedures: Power Amplifier Procedures
8. If no failure is located from the previous checks, troubleshoot the power control circuitry.
Figure 4-9. PA Test Adapter, 40 Watt Power Amplifier
Table 4-19. DC Voltages and Input Power Chart
Test Keyed 9.4 V 9.6 V
CONTROL
VOLTAGE
DRIVE
POWER IN
(mW)
A+ .V
Transmit 9.4 9.6 See note
a
a. Set initially to zero. Increase value until power equals 46 Wafts or 10.0 V maximum.
Do NOT exceed 10.0 V.
30 13.0
Receive 0 9.6 0 0 13.0
1
2
3
4
5
6
7
8
9
10
11
12
A+ TO COMMAND
BOARD
A+ TO COMMAND BOARD
CURRENT SENSE +
CURRENT SENSE -
CONTROL VOLTAGE LIMIT
CONTROL VOLTAGE DRIVE
K9.4
FEMALE RECEPTACLE
CONNECTOR W 100 MIL
SPACING MATES TO P853
REGULATED 9.6V
V DETECT
TEMP SENSE