cm-**-v"**c**d
Page 267
Connect a 1"
jumper wire between the free end of
(
)
Again hold the test cable phono plug tip against pin
1
R645 and pin 20 of board E.
(+
I
I
y
)
of circuit board
F.
If you do not hear a tonefrom the
speaker. check 0504 through
all.
(q
Unsolder the banded end of diode D603 and pull this
lead
cut
of the circuit board.
CRYSTAL FILTER
Solder the free lead of the 18 pF capacitor on the test
cable to the banded end of
d~ode D603.
(
Inject a 3.395 MHz test signal at pin 1 on board E.
A
tone should
be
heard from the speaker.
(
)
Replace board E. A 3.395 MHz signal
is
now available
at the phono plug on the
test
cable.
(
If you do not hear a tone, proceed to "Carrier
GenlXtal Filter Circuit Board," Page 306. Check
\
0601, 0603, the SSB filter and the associated
PRODUCT DETECTOR AND PREAMPLIFIER
circuitry.
(
)
Insert the phono plug on the test cable into the IF
DISCONNECTING THE TEST CIRCUIT
OUTPUT phono socket on the rear panel.
( )
Disconnect the 18 pF capacitor from diode
D603.
( )
Set the MODE switch to the LSB or USB position.
(
)
Resolder the free lead of diode 0603 to its proper
hole in the circuit board.
(
)
You should hear a tone from the speaker.
(
)
Disconnect the jumper wire that is connected between
(
)
If you do not hear a tone, proceed to "Receiver
resistor
R645 and pin
20
of board
E.
IFlAudio Circuit Board." Pase 310. Check T502,
.
D506-D509, IC502 and associated circuitry.
(
Reconnect and solder the free lead of resistor R645 to
the circuit board.
(
)
Disconnect the phono plug from the IF OUTPUT
phono socket.
FRONT END
.ANY
sw
sfp
(
1
IF AMPLIFIER AND AGC
(
)
Turn the AGC off.
(
)
( )
Hold the phono plug tip of the test signal cable against
pin 1 of board
F.
A tone should be heard from the
speaker.
( )
(
)
If you do not hear a tone, proceed to "Receiver'
IFIAudio Circuit Board," Page 310. Check 0501,
IC501, Q502.0503, and associated circuitry.
(
)
( )
Turn AGC to FAST.
Insert the phono plug on the end of the 24" test lead
into the REC phono socket on the rear panel. Connect
the other end of the cable as in Figure
1-8 on Page
241.
~UQCC(~.
You should hear a tone at each 100 kHz point (3.600
MHz. 3.600 MHz, 3.700 MHz etc.) of the VFO dial.
If you do not hear a tone, refer to "Receiver Front
End Circuit Board," Page 308. Check 0701.
0702.
0703, 0704 and the associated circuitry, the bandpass
filters, and the injection of VFO and HFO signals.
Disconnect the 18
pF capacitor from the counter
board.
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