Test Fixture for Power Supply PP-3518/PRC-47

TM 11-5820-509-35

Symbol

Description

Mfgr Part No.

Mfgr Code

Transformer (FSN 5950-982-3748ZX)

BC3069

97315

VR1

Semiconductor device, zener diode 39 v, 5%

1N975B

VR2

Semiconductor device, zener diode 6.2 v, 5% (FSN 5960-752-

1N753A

0179)

XDS1

Lampholder

95408H935

72619

XF1 thru XF4

Fuseholder (FSN 5920-284-7144)

HKPH

71400

Note. All manufacturer's codes are 5-digit numbers. The corresponding manufacturer's name and address are listed in SB 708-42 Catalog Handbook (H4-2).

6-20. Test Fixture for Power Supply PP-

(6) +23V 15 AMP fuse.

This protective

3518/PRC-47

device is connected to the +23 volt primary power circuit

to protect it from overload.

(fig. 7-18)

a. The test fixture for Power Supply PP-3518/PRC-

(7) BLOWER ON-OFF switch. This toggle

47 contains all switches, jacks, meters, and lamps

switch controls the 115 volts, 60 Hz primary power

necessary to electrically test and adjust the module

applied to the blower.

without providing a complete AN/PRC-47 Radio Set.

(8) BLOWER 60 CPS 1/2 AMP fuse. This

Power for the test fixture and the module under test is

protective device is connected to the 115 volts, 60 Hz

provided externally and is connected to the test fixture

primary power circuit that energizes the blower motor

by a specially fabricated cable attached to power

and protects it from overload.

connector J2 at the rear of the test fixture.

(9) HV ON-OFF switch. This toggle switch

b. The operating controls on the front panel of the

enables the push-to-talk relay (K1) in the power supply

test fixture (fig. 6-8) perform the following functions:

module when high voltage output is desired.

(1) 115 VAC ON-OFF switch. This toggle

(10) VOLTAGE SEL switch. This 9-position

switch controls the 115 volts, 400 Hz ac and interlocks

rotary switch selects the power supply module circuit to

the +23 volt dc circuit between the module under test

be monitored and connects it to the DC VOLTAGE

and the test fixture load circuits.

meter, or the AC VOLTAGE, jacks for measurement.

All power supply module outputs can be selected by this

(2) 115 VAC lamp. This indicator is lit when

switch.

power is connected to the 115 volts, 400 Hz primary

power circuit and the 115 VAC ON-OFF switch is in the

(11) DC VOLTAGE meter.

This 0-lO0

ON position.

microammeter is used to indicate the several dc output

voltages of the power supply module as selected by the

13) 115 VAC 5 AMP fuse. This protective

VOLTAGE SEL switch.

device is connected to the 115 volts, 400 Hz primary

power circuit to protect it from overload.

(12) AC VOLTAGE jacks. These jacks are

provided to connect an external ac instrument for

(4) +23V ON-OFF switch. This toggle switch

measuring the filament voltage output of the power

controls the +23 volts dc primary power circuit and

supply module.

interlocks it with the 115 volts, 400 Hz primary power

circuits to prevent both being energized at one time.

c. The piece parts required for fabrication of the

(5) +23V lamp. This indicator is lit when

test fixture are listed in the following chart and

power is connected to the +23 volt primary power circuit

suggested parts placement is shown in figures 6-24 and

and the +23V ON-OFF switch is in the ON position.

6-25. Schematic diagram (fig. 7-18) illustrates the

internal circuit of the test fixture.

6-50