Sanyo PLUS T35 - Display Unit Terminals and Signal Level; Display Unit Terminal Functions; Signal Level Display Operation

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1F-AM

(pin

No.

8).

!t

can

determine

the

setting

of

the

intermediate

frequency

of

FM,

and

is

controlled

by

0004,

0005,

and

0007.

H

level:

+10.7

MHz.

IF-AM1

(pin

No.

11),

IF-AM2

(pin

No.

9).

These

terminals

together

with

FM/AM

terminal,

can

determine

the

intermediate

frequency

of

MW

(AM),

and

are

con-

trolled

by

0004,

Q005,

and

0007.

In

all

three

terminals,

L

level:

+445

MHz.

FM-Fine

(pin

No.

13).

This

terminal

is

an

input

for

fine

adjustment

to

correct

the

deviation

of

intermediate

frequency

of

FM,

and

feeds

divided

voltage

of

semi-

variable

resistor

R039.

AM-Fine

(pin

No.

14)

This

terminal

is

an

input

for

fine

adjustment

to

correct

the

deviation

of

intermediate

fre-

quency

of

MW

(AM),

and

feeds

divided

voltage

of

semi-

variable

resistor

RO40.

Vref

(pin

No.

10).

This

terminal

is

at

the

reference

voltage,

and

is

controlled

by

0004,

Q005,

and

Q007.

TRC/CLK

(pin

No.

15),

SET

(pin

No.

16),

DEMAND

(pin

No.

17),

12H/24H

(pin

No.

18).

These

terminals

are

for

controlling

the

clock,

which

are

not,

however,

used

in

this

model,

and,

hence,

set

at

H

level.

0

(pin

No.

5).

This

terminal

is

to

light

the

lowest

digit

of

display

in

the

case

of

FM

band.

It

is

held

at

H

level.

When

voltage

is

applied

to

segments

a,

c,

d,

f,

and

g

of

the

lowest

digit

and

to

the

plate

terminal,

the

numeral

“6”

will

be

illuminated

(when

pin

No.

4

is

0

V).

Q203__LA1231

FM

1F

-

SYSTEM

Q108

LA1240

AM

TUNER-SYSTEM

R234

(tees

Lies

e@

5

(pin

No.

4).

This

terminal

is

intended

to

change

over

the

display

of

the

lowest

digit

in

FM

band

between

0

and

5.

,

L

fevel:

H

level:

State

of

0

(pin

No.

5)

held

—

“5”

lighted.

0008

turned

ON,

voltage

not

impressed

to

segment

g,

instead

impressed

to

plate

terminals

of

segment

b,

and

e

—

“0”

lighted.

Signal

level

display

The

display

of

signal

level

meter

(electric

field

intensity

display)

is

formed

in

the

upper

part

of

the

dial

case

with

two

LEDs

in

five

stages

(5

segments).

The

principle

of

signal

level

meter

display

is

to

pick

up

IF

signal

of

FM

or

MW

(AM),

and

to

present

a

display

through

the

segment

driver

after

A-D

conversion

in

5

stages.

The

FM

IF

signal

is

picked

up

from

the

output

of

signal

meter

drive

(pin

No.

13)

of

Q203

(FM

IF

system).

The

MW

(AM)

IF

signal

is

picked

up

from

pin

No.

15

of

Q108

(AM

tuner

system).

The

signal

thus

taken

out

is

fed

into

IN3

(pin

No.

3,

IN}

(pin

No.

2)

of

0204

(5-bit

level

meter)

through

signal

adjusting

semivariable

resistors

R228,

R234.

The

input

signal

is

amplified

by

operational

amplifiers

A1,

A2

in

Q204,

and

is

compared

in

operational

amplifiers

C1

through

C5,

to

be

divided

into

signals

in

5

stages.

The

reference

voltage

to

compare

with

is

divided

by

R1

through

R5

to

be

generated.

When

an

input

higher

than

the

com-

parative

reference

voltage

is

fed,

the

output

becomes

H

level,

thereby

lighting

up

the

LED.

Q204

LB1416

SBIT

SIGNAL

LEVEL

METER

a

pei

a

us

@l

LED

7

SLLO

002GR

LED

8

SLLD

003GR