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te
dbase
anti
Peer ie
7.1
TRANSMITTER
AND
RECEIVER
CIRCUITS
SYMPTOMS
CAUSE
REMEDY
Pilot lights do not light and there is no
receiver noise when
the POWER
switch
is turned on,
Bad power supply cable or bad power
supply connections.
. Blown power supply
fuse.
. Wrong
polarity connection
with DS-
900.
. Check cables and connections.
. Replace the fuse.
3. Check for a negative ground power
connection.
Frequency difference
between
transmit
and receive.
FMing on sideband operation.
1. 9 volt supply not adjusted,
. Short circuit in 9 volt power supply
or line.
Improper
battery
voltage
in mobile
or portable
operation.
RTTY
jack shorted to chassis.
1. See Section 6.3.
. Check CAR-AVR
board.
Check
battery
or alternator
volt-
age.
Check
RTTY
jack and its wiring.
Dial pointer lamp does not light.
Rear panel VFO switch is set to RMT.
. Set the switch to INT.
Reseat CONT board.
Relays
do
not
operate
with
the stand-
by switch in the SEND
position.
The
relays
operate
with
the
stand-by
switch in the VOX position.
. Q8 on the VOX-MKR
board
is de-
fective.
If only
one
relay does
not operate,
the relay
is defective.
Replace Q8.
. Replace the bad relay.
Improper microphone connection.
. Rewire the microphone
connector.
The dial calibrating
lever will not move
far enough
to calibrate
the dial scale.
. VFO
requires
internal
calibration.
. See Section
6.9.
Signal
reports
of off frequency
opera-
tion even
though
the dial scale is cali-
brated.
7.2
RECEIVER
SECTION
SYMPTOMS
. Calibrator
requires
adjustment.
CAUSE
. See Section 6.10.
REMEDY
. The VFO
power plug or output cable
is disconnected or open.
Defective
diodes at the input/output
of the IF board.
Defective
NB board or defective XF
board.
. Check the VFO section.
. Replace the diodes.
. Check the boards.
CW filter is installed but selectivity and
intelligibility are poor.
- Connector at the bottom
of the XF
board is reversed.
Bad
CW
filter.
. Check
the
polarity
of the con-
nector.
Replace the filter.
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