5: Maintenance
5-4
PRC-PS-MS
Connect the C991608 cable to the SET POWER connector (J1) on the
PRC-PS front panel. Carefully insert a short bus wire (18 AWG) into pin A
and another one into pin E on the C991608 cable connector. Repeat the
previous checks.
Note:
For the following steps, mount the 8.2 ohm and the 1.5 ohm resistors
on a heat sink. Each resistor dissipates close to 50W during these tests and
will get extremely hot if they are not installed on a heat sink.
Power Supply
DC Voltage and
Current
1. Using the clip jumpers to connect the 2.2 ohm resistor across pins A and
E on the C991608 cable connector.
2. Measure the DC voltage at these pins. The DC voltage should be
12.5 Vdc ±0 Vdc.
3. Disconnect the 2.2 ohm resistor and connect the 1.5 ohm resistor in
series with the DC ammeter to pins A and E on the C991608 cable
connector. The DC current should be 6A ± 0.3A.
4. Remove the 1.5 ohm resistor and reconnect the ammeter across pins A
and E on the C991608 cable connector. Measure the DC current. It
should be 6A ±0.3A.
Reverse Current
Protection
1. Connect the 82 ohm resistor across the front panel DC input pins.
2. Measure the DC voltage across the 82 ohm resistor. It should be
0 Vdc ±0 Vdc.
Figure 5-3. J1 Pin Assignments
Pin
Description
A
GND
C
PTT
E
12 Vdc (jumpered)
F
12 Vdc battery
P
RX Audio
J
1
B
A
D
E
J
N
P
C
F
H
L
M
K
R
