Heathkit HW-9 User Manual

Page 92
Heathkit®
General
Receiver
Problems
No
audio output,
sidetone present,
transmit okay but meter
not
working in
receive.
No audio output,
sidetone
present, transmits
okay, meter okay
in receive.
No audio or
sidetone, meter okay
in transmit and
receive.
Weak or low
audio on alt bands,
transmits okay.
Poor receiver
sensitivity.
1.
2.
3.
4.
5.
6.
U301.
AGC (pin 5
of
U301 )
too
high.
AGC Threshold (R329)
misadjusted.
U302, Q301,
D301.D302.
No
R1 2 Volts on D301 .
(Q407,
Q408)
L308
open.
U303,
U304.
Shorted cables to
Selectivity switch.
U303,
U306.
Phone
jack wiring,
cables shorted
D301
,
D302,
open L303.
Q301,U301,FL301.
T404 incorrectly
wired or shorted
D403,
D404, D407.
AGC (R329)
misadjusted.
Q107.
Q301.
General
Transmitter
Problems
Low
or no RF output
on all
bands, receive
and sidetone
okay.
I
1.
CW
Level control
wiring.
2.
Low or no TX
Out from
BFO (see
"BFO
Problems").
3.
D401.D402,
L421.
4. Q401
through Q406.
No RF output
or sidetone,
receive
okay.
1.
Q408.
2. No
T1
2
volt supply.
3.
Wiring at
Key jack
or T/R
board.
4. Broken
lead in
key cable.
Transmit and
Receive
Problems
No
transmit
or
receive
on any band,
sidetone okay.
1.
9-volt supply, U402.
2.
Antenna
or cable
connection. I
3.
Bandswitch
wafer misaligned.
4.
No
HFO output
(See
"HFO
Problems").
5.
Q10t,Q107.
6.
No BFO
output (See
"BFO
Problems").
7.
Mixer
filters.
No transmit or
receive
-
one
band.
I 1 .
HFO
oscillator,
mixer
filter.
2.
Band
switch
or switched
9-volt
supply to
oscillator.
I 3.
Bandpass
filter
misaligned.

Heathkit HW-9 Specifications

General

Brand	Heathkit
Model	HW-9
Category	Transceiver
Language	English