TM 11-6625-2958-14&P

Table 5-8.Checks and Adjustments After Replacement of Semiconductor Devices

REFERENCE

FUNCTION OR CIRCUIT

 

 

CHECK

 

ADJUST

 

 

 

 

 

 

 

Z1

 

Constant voltage and con-

Constant voltage (CV) line and load reg-

R110, or

 

 

 

stant

current

differential

uIation.

Zero

volt output.

 

R113 (OP-

 

 

 

amplifiers.

 

 

Constant current (CC) line and load reg-

tion 020);

 

 

 

 

 

 

 

R117, or

 

 

 

 

 

 

 

ulation. Zero

current output.

R119

 

 

 

 

 

 

 

 

 

 

 

(Option

 

 

 

 

 

 

 

 

 

 

 

021)

 

 

 

 

 

 

 

 

Q1

 

Voltage clamp circuit.

CC load regulation.

 

- - -

 

 

 

 

 

 

 

 

 

 

 

Q20

 

Short

circuit

protection.

Output

current, protection

action.

- - -

 

 

 

 

 

 

 

Q40, Q41

Mixer

amplifier.

CV/CC load reguIation. CV transient

R47

 

 

 

 

 

 

 

response.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q42, A4Q101,

Driver

and

error amplifiers.

CV/CC

load

regulation.

 

- - -

 

A4Q102

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q60, Q61,

Reference

regulator.

+12.4V, +6.2V, and -6.2V reference volt-

- - -

 

Q62, Q63

 

 

 

 

ages and reference circuit line operation.

 

 

 

 

 

 

 

 

 

 

 

Q70

 

Overvoltage

limit.

Limiting

action and level.

 

- - -

 

 

 

 

 

 

 

Q71, Q72,

Preregulator

control cir-

Output voltage, rippIe imbalance, and

R70, R82

 

Q73

 

cuit.

 

 

 

preregulator

waveforms.

 

 

 

 

 

 

 

 

 

 

Q90, Q91,

Crowbar.

 

 

Crowbar action, trip voltage, voltage

A5R125

 

Q92

 

 

 

 

 

across series regulator when tripped.

 

 

 

 

 

 

 

 

 

 

 

A4Q103 thru

Series

regulator.

CV/CC

load

regulation.

 

- - -

 

A4Q108

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A42CR1

 

Preregulator.

 

Output

voltage.

 

R7O

 

 

 

 

 

 

 

 

 

 

 

 

 

CR1, CR20

CV/CC OR gate.

CV/CC

crossover operation.

- - -

 

 

 

 

 

 

 

 

 

CR2, CR3

Voltage clamp circuit.

CC load regulation.

 

- - -

 

 

 

 

 

 

 

 

 

CR4, CR40,

Temperature

stabilizing

Temperature

coefficient.

 

- - -

I

CR41

 

diodes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR5, CR6,

Limiting diodes.

CV/CC

load

regulation.

 

- - -

 

CR21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR7, CR60,

Reference

regulator.

+12.4V, +6.2V, and -6.2V reference

- - -

 

CR61, CR62

 

 

 

 

voltages.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR35, CR36,

Turn-on circuit.

Preregulator

control turn-on

delay.

- - -

 

 

 

CR37

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR43,

CR45

Bias supply.

 

+11V, -4V, and -2.4V bias

voltages.

- - -

 

thru CR49,

 

 

 

 

 

 

 

 

 

 

CR53,

CR54

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR44, CR50

Driver

and

error amplifier.

Down-programming speed, CV/CC

- - -

 

 

 

 

 

 

 

 

 

load regulation.