Kenwood TS-820 manual Trolibleshooting, General Information, Transmitter a N D Receiver Circuits

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SECTION 7. TROLIBLESHOOTING

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7.1	GENERAL INFORMATION	general	b y	improper operation o r connection o f	the trans^
		ceivcr,	n o t	b y defcctcve c o m p o n c n t r . Thcrc i s	a reparall:
The	problem5 dercribed i n thir table are f a ~ l u r e caured in	rervice	manual f o r repair o f the TS - 820

7.2TRANSMITTER A N D RECEIVER CIRCUITS

-

SYMPTOMS

CAUSE

R E M E D Y

' Pilot

-

llghrr

d o n o t

light and theye is no

1.

Bad power cahlc or conner!ionr.

1.

Chc?ck col,ll:r

;md connr:riionr

receiver noise when

the POWER r w i l c h i r

2.

B l o w n newer r u p ~ l ylure.

2 .

R ~ p l a cthe~

lure .

turned on.

3.

Wrong

polarily

c o n n r c l i o n

for

D C

3:

Check

for a ncgallvr: ground 0owl:r

operation.

c o n n u c l ~ o n .

Frequency

difference between

transmit

1.

9 V D C supply not aJjurlrd.

1.

See Secl~on6.3.

and

receive.

2.

Short

c l r c u i l in

9 volt powl:r

rut,ply

or

2.

Check

the 9 v o l l i u i i i l l y .

tine.

F M i n g on sideband operation.

3.

Improper battery volkagc in mobile or

3.

Chtcck

h a \ t ~ . r yor altr:rnator volI:lyr:.

portable operation.

V F O lor F I X ) indicator doer

n o t

light.

1.

Rear panel V F O

plug not l n s r r l r d

I 1.

l n l e r t

the jumpered p l u g

The

relays

operate

w i t h

the

stand-by

1.

Improper i n i c r o l ~ h o n rconnccllon .

1.

Requare thc! microphonr: connl~clor .

1w8tch

i n the

R E C position.

-.

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.

7.3 RECEIVER SECTION

SYMPTOMSC A U S E

!

1

!

	Accessory CW filter is	installed b u t ielec-	1. Connection of IF board not moved to CW.
	l i v i l y and intelligibility	are poor .	2.	Bad CW fllrer.
	An antenna i r connecred b u r no signals		1 .	Inoperative V F O or F C orcillalor .
	are heard.		2.	Microphone P T T	r w i l c h lor rland - by
-',				switch) is in the transmit posilzon.
			3.	Transverter switch	is ON.
	-
	An antenna is connected and the calibrator		1.	Bad T I R relay.

rignal i s received. b u t no r ~ g n a l are heard.

1 1. See Sectran 6.2

2.Replace the CW filter.

1.Insert Ihe shunt plug into back panel.

2.Release the PTT switch.

-3. Turn tile switch OFF. 1. Replace the relay.

':.	One or m o r e bands are operating b u t rorne	1.	The PLL unit 8s nor operatng on thedefective
	arc n o t		band.
		2.	The antenna coil o f the defective band
			requires alignment.

1 . Repair the PLL unit.

2. See Section 6.3.

1

S-meter deflects w i t h o u t a received signal.				1.	I F	board is our o f		adiurtmenr.
				2.	L o w A C line voltage.
				1.	I F	board	is & t o f	a d i u r t m r n l ,
				2.	R F	gain	control	closed	l o w
					senrit;vity.
				1. Receiver rectlon reouirer realianmenr.
The R I T control i r	a l zero	w l t h	the R I T	1 .	The R I T		c o n l r o l ,s our o f		adjurtnlenl.
circuit on. b u t the	receive	and	transmit
				1 .	R I T circuit o f f .
SSB signal unintelligible.				1 ,	M O D E r w i f c h i r set to wrong rideband,
SSB received slgnal is extremely hlgh cur lor				1
				1	IF SHIFT is out of adjustmen?
tow cut/,

1.See Section 6.3

2.Use a s,ep-up transformer to raise the line voltage,

1.See Section

2.Open R F G A I N control.

1.See Section

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- band.

1 . se, I ,n the center [in ,he pasilion 01 click)

1