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SECTION
7.
TROLIBLESHOOTING
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7.1
GENERAL INFORMATION
general by improper operation or connection of
the
trans^
ceivcr, not by defcctcve componcntr. Thcrc
is
a reparall:
The problem5 dercribed in
thir
table are fa~lurer caured
in
rervice manual for repair of the
TS-820
7.3
RECEIVER SECTION
7.2
TRANSMITTER AND RECEIVER CIRCUITS
!
1
!
.
-
I,
-
-
::,'
-.
*
'
SYMPTOMS
CAUSE
',
-
':.
Signal reports of off frequency operation
1.
Calibrator requires allgnrnent.
1.
See
Secton 6.3
even
though (he dial scale ir calibrated.
-
SYMPTOMS
Pilot
llghrr do not light and theye is
no
receiver noise when the POWER rwilch ir
turned
on.
Frequency difference between transmit
and receive.
FMing
on
sideband operation.
VFO
lor
FIX)
indicator doer not light.
The
relays operate with the stand-by
1w8tch in the REC position.
Accessory CW filter is installed but ielec-
1.
Connection of IF board not moved to CW.
1
1.
See
Sectran 6.2
1.
IF board is
&t
of adiurtmrnl,
2.
RF gain control closed low
senrit;vity.
1.
Receiver
rectlon
reouirer realianmenr.
livily
and
intelligibility
are
poor.
An
antenna ir
connecred
bur
no
signals
are
heard.
-
1.
See Section
2.
Open RF GAIN control.
1.
See Section
The RIT control
ir
al
zero
wlth the RIT
circuit
on.
but the receive and transmit
SSB signal unintelligible.
CAUSE
-
1.
Bad power cahlc
or
conner!ionr.
2.
Blown
newer
rup~ly lure.
3.
Wrong polarily connrclion for DC
operation.
1.
9 VDC supply
not
aJjurlrd.
2.
Short clrcuil
in
9
volt powl:r rut,ply
or
tine.
3.
Improper battery volkagc in mobile
or
portable operation.
1.
Rear panel VFO plug
not
lnsrrlrd
1.
Improper inicrol~honr
connccllon.
1
REMEDY
1.
Chc?ck
col,ll:r
;md connr:riionr
2.
R~plac~ the lure.
3:
Check for
a
ncgallvr: ground 0owl:r
connucl~on.
1.
See
Secl~on 6.3.
2.
Check the 9voll iuiiilly.
3.
Chtcck ha\t~.ry
or
altr:rnator volI:lyr:.
I
1.
lnlert the jumpered plug
1.
Requare thc! microphonr:
connl~clor.
-.
2.
Bad CW fllrer.
1.
Inoperative VFO
or
FC orcillalor.
2.
Microphone
PTT rwilch
lor
rland-by
switch) is in the transmit posilzon.
3. Transverter switch is ON.
1.
The RIT conlrol
,s
our
of adjurtnlenl.
1.
RIT circuit off.
1,
MODE rwifch ir set
to
wrong rideband,
band.
2.
Replace the CW filter.
1.
Insert Ihe shunt plug into back
panel.
2.
Release the PTT switch.
3. Turn
tile switch OFF.
-
1.
See Seclion
1.
Push RIT button.
1.
TU,~
MODE switch
to
correct ride-
1.
Replace the relay.
1.
Repair the PLL unit.
1
2. See Section 6.3.
1.
See Section 6.3
2.
Use
a
s,ep-up transformer to raise
the line voltage,
An
antenna is connected
and
the calibrator
rignal
is
received.
but
no
r~gnalr
are
heard.
One
or
more bands
are
operating but
rorne
arc
not
S-meter deflects without
a
received signal.
SSB
received
slgnal is extremely hlgh
cur
lor
tow cut/,
1.
Bad TIR relay.
1.
The PLL unit
8s
nor
operatng
on
thedefective
band.
2.
The
antenna
coil of the defective band
requires alignment.
1.
IF board is
our
of adiurtmenr.
2.
Low AC line voltage.
1
IF SHIFT is
out
of adjustmen?
1.
se,
I
,n
the
center
[in ,he pasilion
01
click)
1