Kenwood TS-780 manual Trouble Shooting, Symptoms, Cause, Countermeasure

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i	SECTION 7. TROUBLE SHOOTING		:
			i

SYMPTOMS

CAUSE

COUNTERMEASURE

N o

receiver

n o i s e

f r o m s p e a k e r

i n F M

Squelch

circuit

is ON.

Turn

SQUELCH

control counterclockwise.

mode.

Transceiver is connected to antenna, but

1. A n t e n n a

c o n n e c t o r s

f o r

1 4 4 a n d

1. Check antenna and connect correctly.

n o

Signal

i s

r e c e i v e d ,

w h i l e

“ S ”

meter

4 3 0 M H z b a n d s a r e n o t c o n n e c t e d

pointer

remains deflected.

correctly.

2.

Squelch

is

ON.

2.

Turn

squelch

control

counterclockwise.

3.

Microphone

PTT

switch

is

depressed.

3. Set PTT switch to receive Position.

Even

in

the

absence of

Signal,

“S”

meter

RF GAIN control is set too low.

Turn RF GAIN control fully

clockwise.

pointer

remains deflected.

SSB Signal is being received but speaker.

Transceiver is set for opposite side band.

Set MODE switch to LSB or USB.

RIT

control

inoperative.

RIT switch

is

OFF.

Set RIT switch to ON (indication of digital

display remains the Same).

SSB

receive

Signal

is in

“high

Cut”

or “low

Maladjustment

of IF

SHIFT.

S e t

t h e c o n t r o l

i n t h e

Center

(detent)

Cut”.

~--.

Position.

No transmit output (SSB).

1. Poor contact of MIC

jack

or

plug.

1.

Connect the microphone

plug

securely.

2.

SSB

MIC

control

in

minimum

Position.

2. Turn SSB MIC control clockwise.

No transmit output (CW).

1. I m p r o p e r

c o n n e c t i o n

o f

K E Y

jack

or

1. Connect the KEY securely.

poor

contact of KEY.

2. CARL control in minimum

Position.

2. Turn CAR.L control clockwise.

No side tone

during

CW

Operation.

S-TONE control in minimum

Position.

Turn the S-TONE control clockwise.

No FM modulation or insufficient

modula-

FM-MIC control in minimum

Position.

Turn FM-MIC control clockwise.

tion.

--~-

VOX

not operating.

1. VOX switch is OFF.

1. Set VOX switch to ON.

2.

VOX

GAIN

control

in

minimum

Position.

2. Turn VOX GAIN control clockwise.

Sound Stops

when dial is turned quickly in

PLL unlock

circuit is

operating;

this is normal

and is not an indication of trouble.

F.STEP

ON.

C h a n n e l scanned

f i r s t

i s

n o t

c l e a r l y

When Signal is present in the first channel, the scan busy Stops

(FM, FM-CH mode). Set

indicated when MS switch is set to ON.

MS

switch

to

ON once again,

or

wait

until

the

scan

complets one cycle.

Scan does not continue when F.LOCK is

Scan Operation is effected even when F.LOCK is ON. The BAND UP/DOWN is possible

ON or BAND SW is depressed.

-

during

scan Operation.

~-

UP/DOWN

Speed is

slow

when

dial

is

turn-

The Speed is

controlled

by

the dial.

ed during continued UP/DOWN of BAND.

-

RX

frequency

which

is not shifted is

stored

Unshifted RX

frequency

is

stored

during

repeater

Operation.

w h e n T X f r e q u e n c y

i s s t o r e d

during

repeater

Operation.

When VFO A is 433.00 MHz and VFO B is

Repeater Operation at A-R and B-R is

complex.

Use the A or B Position.

1 4 5 . 0 0 MHz

during r e p e a t e r O p e r a t i o n ,

the display flickers (VFO A and B are in-

d i c a t e d

a l t e r n a t e l y ) a t

function

A - R T X

OFF SET ” -” or ” + ” and REV SW ON.

When the power switch is set to OFF and

Set the power switch to ON more than 10 seconds after it has been set to OFF.

ON without using the backup circuit, VFO

and memory CH are not reset properly.

When their

is

a faulty indication.

Set the

power

switch

to

OFF

(when

using

the

back-up

function,

this should be done after

removing the batteries), and reset it to ON after a few seconds. Check that the switch

has been correctly reset before inserting the batteries.

22