Table 2. Power Supply Output Voltages

(1) Connect unit under test oscillator panel (1A1)

OUTPUT 1 connector to A INPUT of the frequency counter

b. Operate RF oscillator (lA1) FREQUENCY IN MHz

using RF cable assembly W118.

1, 2, 3, and 4 switches to OFF.

(2) Insure that MAINS switch is set to ON and

c. Disregard settings of. remaining controls and

that service strip power switch is set to on position.

switches on unit under test.

(3) Set oscillator panel (1A1) FREQUENCY IN

d. Operate service strip power switch to on position.

MHz 1 switch to positions noted in table 3.

Observe that service strip power indicator light illuminates.

External test equipment used during the calibration

(4) Observe that frequency counter indications

procedure can be connected to the service outlets for

are within the limits specified in table 3.

primary power.

(5) Return FREQUENCY IN MHz 1 switch to

OFF.

NOTE

(6) Remove RF cable assembly W118 from

The following paragraphs are divided

OUTPUT 1 connector and connect it to OUTPUT 2

into subparagraph a, performance

connector.

check,

and

subparagraph

(7) Set FREQUENCY IN MHz 2 switch to

adjustments. When the performance

positions noted in table 4.

check is within tolerance do not

perform the corresponding adjustment.

Table 3. Oscillator Panel 1A1 OUTPUT 1 Frequencies

When the performance check is not

Unit under test

Frequency counter indication (Hz)

within

tolerance,

perform

the

FREQUENCY

corresponding

adjustment

before

IN MHz 1

continuing

with

the

calibration

Oscillator

switch position Minimum

Maximum

procedure.

When the performance

A22

2.300

22,999,885

23,000,115

check is not within tolerance and the

A23

26.750

26,749,866

26,750,134

adjustment cannot bring it into

A24

27.250

27,249,864

27,250,136

tolerance, the deficiency must be

A25

27.750

27,749,861

27,750,139

corrected before continuing with the

A26

147.000

146,997,060 147,002,940

procedure.

A27

151.750

151,746,965 151,753,035

A28

80.875

80,873,382

80,876,618

7. Power Supplies 1A3PS1 and 1A3PS2 Calibration

A29

86.000

85,998,280

86,001,720

a. Performance Check.

A30

86.625

86,623,267

86,626,733

(1) Connect dc voltmeter to test points on

A31

87.125

87,123,257

87,126,743

power supply panel (1A3) as noted in table 2.

A32

87.375

87,373,252

87,376,748

(2) Observe that dc voltmeter indicates within

the limits specified in table 2.

(8) Observe that frequency counter indications

Table 2. Power Supply Output Voltages

are within the limits specified in table 4.

Unit under test

Dc voltmeter indication

(9) Return FREQUENCY IN MHZ 2 switch to

Front panel

OFF.

Power supply

test points

Minimum

Maximum

(10) Remove RF cable assembly W118 from

1A3PS1

GND and 18

+17

+19

OUTPUT 2 connector and connect it to OUTPUT 3

A3PS2

GND and - 9

-8

-10

connector.

(11) Set FREQUENCY IN MHZ 3 switch to

b. Adjustments.

positions noted in table 5.

(1) Remove screws securing power supply

(12) Observe that frequency counter indications

panel (IA3) to cabinet frame.

are within the limits specified in table 5.

(2) Pull out panel until it docks into open

(13) Return FREQUENCY IN MHZ 3 switch to

position.

OFF.

(3) Remove popover supply panel (1A3) cover

(14) Remove RF cable assembly W118 from

screen.

OUTPUT 3 connector and connect it to OUTPUT 4

(4) Locate voltage adjust potentiometers on

connector.

power supplies 1A3PS1 and 1A3PS2.

(15) Set FREQUENCY IN MHZ 4 switch to

(5) Rotate the voltage adjust associated with

positions noted in table 6.

each power supply to obtain indications with the limits

(16) Observe that frequency counter indications

specified in table 2.

are lecithin the limits specified in table 6.

(6) Disconnect dc voltmeter from power supply

(17) Return FREQUENCY IN MHZ switch to OFF.

panel 1A3 test points.

(18) Remove RF cable assembly W118 from

(7) Replace

cover

screen

power

OUTPUT 4 connector on oscillator (lA1) panel.

subassembly!'

(8) Secure power supply panel (1A3) to cabinet

frame with holding screws.

8. Oscillators 1A1A1 Through 1A1A43 Calibration

a. Performance Check.