HP 6268B Operating And Service Manual

Table 5-8. Checks and Adjustments Required After Semiconductor Replacement (Continued)
ADJUST
R70, R82 (See para.
5-100 and 5-102).
5-104).
REFERENCE
FUNCTION OR CIRCUIT
CHECK
Q71, Q72
Q73
Preregulator control circuit.
Output voltage, ripple imbalance, and
preregulator waveforms.
Q90, Q91
Q92
Crowbar.
Crowbar action, trip voltage, voltage across
series regulator when tripped.
A4Q103 thru
A4Q106,
A4Q108, or
A4Q110 (as
applicable)
Series regulator.
CV/CC load regulation.
A2CR1 Preregulator.
Output voltage.
CR1, CR20
CV/CC OR gate.
CV/CC crossover operation.
CR2, CR3 Voltage clamp circuit.
CC load regulation.
CR4, CR40,
CR41
Temperature stabilizing diodes.
Temperature coefficient.
CR5, CR6,
CR21
Limiting diodes.
CV/CC load regulation.
CR7, CR60,
CR61, CR62.
Reference regulator.
+12.4V, +6.2V, and -6.2V reference
voltages.
CR35, CR36,
CR37.
Turn-on circuit.
Preregulator and series regulator
turn-on delay.
CR43, CR45
thru CR49,
CR53, CR54
Bias supply.
+11 V, -4V, and —2.4V bias voltages.
CR44, CR50
Driver and error amplifier.
Down-programming speed, CV/CC
load regulation.
CR70, CR71 Overvoltage limit circuit.
Limiting action and level.
CR72 thru
CR84, CR88
Preregulator control.
Output voltage, ripple imbalance, and
preregulator waveforms.
CR90 thru
CR93,
A4CR108,
A4CR110
Crowbar.
Trip voltage, voltage across series regulator
when crowbar is tripped, supply stability.
A4CR101 and
A4CR102, or
A4CR101 thru
A4CR104.
Main rectifier diodes.
Voltage across main filter capacitors.
R70 (See para. 5-102).
R70, R82 (See para.
5-100 and 5-102).
R95, A5R125 (See
para. 5-104 and 5-106).
5-14

HP 6268B Specifications

General

Brand	HP
Model	6268B
Category	Power Supply
Language	English