Heathkit HP-23A - Troubleshooting Chart; Technical Specifications

Troubleshooting
Chart
Completely inoperative, Circuit breaker open,
Switch defective,
Pin 9 or 10 on power output socket or
cable plug open or incorrectly wired,
Remote switching circuit in associated
equipment faulty.
Power transformer defective,
Circuit
breaker
opens
Short
in
power
transformer
windings,
when
reset,
Short
in
rectifier
or
filter
circuits,
Short
in
associated
equipment,
Overload
in
associated
equipment,
No
high
B+
voltage,
Diodes
D1,
D2,
D3
or
D4
faulty,
Pin
4
on
power
output
socket
or
power
cable
plug
open
or
incorrectly
wired,
Power transformer defective,
No
low
B+
voltage,
Diode
D5
and/or
D6
open,
Filter
choke
Li
open.
Pin
3
of
power
output
socket
or
cable
plug
open
or
incorrectly
wired,
Switch
incorrectly
wired
or
faulty,
Polarity
of
diodes
or
filter
capacitors
is
incorrect,
No
bias
voltage,
Diode
D7
open.
Resistors
R7,
R8
or
R9
open,
Pin
11
or
1
of
power
output
socket
or
cable
plug
open
or
incorrectly
wired,
High
B+
voltage
only
half
Diode
D1,
D2,
D3
or
D4
open,
of
indicated
value
with
no
load,
less
under
load,
Low
B+
voltage
only
half
Diode
D5
or
D6
open.
of
indicated
value,
All
voltages
only
half
of
Power
transformer
primary
wired
for
220
indicated
values.
VAC
when
Power
Supply
is
used
on
120
VAC,