Installation - TM-11-5820-554-120049

TM 11-5820-554-12

Figure 7-6. Power Supply PP-4151/FRC -93 S. location of power plugs P1 and P2.

(5) After a 2-minute warm-up period, the no

7-10. Installation

signal pa plate current, as monitored on the meter,

CAUTION

should be approximately 40 ma. If it is not 40 ma,

Possible damage to associated equipment

adjust BIAS ADJUST potentiometer R9 at the rear of

can result if the keyway of power plug P1 is

the PP-4151/FRC-93 until a 40-ma reading is obtained.

not aligned with the keyway of its

associated mating connector.

Always

NOTE

disconnect a.c. power plug P2 when joining

When using a line frequency higher than

P1 with its respective mating connector.

60 Hz, remove capacitor C1. Always

Always check for keyway alignment before

make sure adequate ventilation is provided

applying power, and be sure power

for the heat generating components of the

transformer

primaries

are

correctly

equipment.

connected for the line voltage to be used.

7-11. Operation

a. Plug connector P1 into its mating connector.

Operation of the PP 4151/FRC-93 is controlled

b. Plug line connector P2 into an a.c. outlet. If the

completely by switches and relays in the associated

a.c. outlet is not fitted with a mating connector, use the

equipment. The only adjustment provided in the PP

adapter furnished, and ground the green wire.

4151/FRC-93 is the -55- to -80-volt d.c. variable bias

c. Turn on the associated equipment and adjust

supply. This is a screwdriver adjustment accessible at

BIAS ADJUST potentiometer R9 (accessible at the rear

the rear of the unit. The bias adjustment will depend on

of the PP -93 4151/FRW93 without the cover removed)

the type of equipment used with the PP-4151/FRC-93.

to the desired bias level. The PP -4151/FRC-93 is now

ready for use. When using the Collins KWM-2/2A,

7-12. Operator's and Organizational

proceed as follows:

Maintenance Instructions

(1) Set the MIC GAIN control fully

Operator's maintenance instructions are covered in

counterclockwise.

paragraph 7-26 and 7-27. Organizational maintenance

(2) Set the EMISSION switch to LOCK.

instructions are covered in paragraph 7-28 and 7-29.

(3) Set the meter switch to PA PLATE.

(4) Set the OFF-ON-NB-CAL switch to ON.

7-6