Kenwood TS-820 Operating Manual page 40

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SECTION 7. TROLIBLESHOOTING
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7.1 GENERAL INFORMATION
general b y i m p r o p e r o p e r a t i o n o r c o n n e c t i o n o f the
trans^
ceivcr, n o t b y defcctcve c o m p o n c n t r . T h c r c i s a reparall:
The p r o b l e m 5 dercribed i n thir table are f a ~ l u r e r caured in
rervice manual f o r repair o f t h e T S - 8 2 0
7.3 RECEIVER SECTION
7.2 TRANSMITTER A N D RECEIVER CIRCUITS
!
1
!
.
-
I ,
-
-
: : , ' -. *
'
S Y M P T O M S C A U S E
' ,
-
' : .
Signal reports o f o f f frequency operation 1. Calibrator requires allgnrnent. 1 . See Secton 6.3
even though (he dial scale ir calibrated.
-
S Y M P T O M S
P i l o t llghrr d o n o t l i g h t and theye is no
receiver noise when the POWER r w i l c h i r
t u r n e d on.
Frequency d i f f e r e n c e between transmit
and receive.
F M i n g on sideband operation.
V F O lor F I X ) indicator doer n o t light.
T h e relays operate w i t h the stand-by
1w8tch i n the R E C position.
Accessory CW f i l t e r is installed b u t ielec- 1. Connection of IF board not moved to CW.
1
1. See Sectran 6.2
1.
I F b o a r d is
& t
o f a d i u r t m r n l ,
2. R F gain c o n t r o l closed l o w
senrit;vity.
1. Receiver rectlon reouirer realianmenr.
l i v i l y and intelligibility are p o o r .
An antenna i r connecred b u r no signals
are heard.
-
1. See Section
2.
Open R F G A I N control.
1. See Section
T h e R I T c o n t r o l
i r
a l zero w l t h t h e R I T
c i r c u i t on. b u t the receive and transmit
SSB signal unintelligible.
CAUSE
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1. Bad p o w e r cahlc
or
conner!ionr.
2.
B l o w n
newer
r u p ~ l y lure.
3.
Wrong p o l a r i l y c o n n r c l i o n for D C
operation.
1. 9 V D C supply not aJjurlrd.
2.
S h o r t c l r c u i l in
9
volt powl:r rut,ply
or
tine.
3.
Improper battery volkagc in mobile or
portable operation.
1.
Rear panel V F O p l u g not l n s r r l r d
1. I m p r o p e r i n i c r o l ~ h o n r
connccllon.
1
R E M E D Y
1. Chc?ck col,ll:r ;md connr:riionr
2 .
R ~ p l a c ~ the l u r e .
3:
Check for a ncgallvr: ground 0owl:r
c o n n u c l ~ o n .
1. See Secl~on 6.3.
2. Check the 9 v o l l i u i i i l l y .
3.
Chtcck h a \ t ~ . r y or altr:rnator volI:lyr:.
I
1. l n l e r t the jumpered p l u g
1. Requare thc! microphonr: connl~clor.
-.
2.
Bad CW fllrer.
1 . Inoperative V F O or F C o r c i l l a l o r .
2.
Microphone P T T r w i l c h lor r l a n d - b y
switch) is in the transmit posilzon.
3. Transverter switch is ON.
1 . T h e R I T c o n l r o l ,s our o f adjurtnlenl.
1. R I T c i r c u i t o f f .
1 , M O D E r w i f c h i r set to w r o n g rideband,
band.
2.
Replace the CW filter.
1.
Insert Ihe shunt plug i n t o back
panel.
2. Release the PTT switch.
3. Turn tile switch OFF.
-
1. See Seclion
1.
Push R I T b u t t o n .
1 . T U , ~ M O D E 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 i s
received.
b u t no r ~ g n a l r are heard.
One or m o r e bands are operating b u t rorne
arc n o t
S-meter deflects w i t h o u t a received signal.
SSB received slgnal is extremely hlgh
cur
lor
tow cut/,
1. Bad T I R relay.
1. T h e PLL unit
8 s
nor operatng on thedefective
band.
2.
T h e antenna coil o f the defective band
requires alignment.
1. I F board is
our
o f adiurtmenr.
2. L o w A C line voltage.
1
IF SHIFT is out of adjustmen?
1 .
se,
I
,n the center [in ,he pasilion 01 click)
1