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– 49 –

Note on adjustment: Adjust the contrast at “8” of 15 steps.
Connection:

+
–

TP1
TP2

liquid crystal

module

digital voltmeter

Adjustment Procedure:
1. Fix display board and rear panel with screws.
2. Connect the display board and liquid crystal module.
3. Connect the front panel of which status is as shown above to

the control unit. (Display will turn on.)

4. After the display turned on, allow ten minutes to elapse, then

connect a digital voltmeter to TP1 and TP2 of liquid crystal
module.

5. Adjust RV801 on the display board so that the reading of digi-

tal voltmeter satisfies the specified value.

Specified Value: 20.95 V to 21.00 V

Adjustment Location: DISPLAY board (See page 51)

– 50 –

TRACKING OFFSET
Adjustment
RV101

FOCUS BIAS
Adjustment
RV102

CNJ102

TP (RF)

TP (TE)

TP

(VC)

IC101

•

•

FM NOISE FOCUS Adjustment
RV205

FM AUTO SCAN/STOP LEVEL
Adjustment
RV203

FM STEREO SEPARATION
Adjustment
RV204

AM AUTO SCAN/STOP
LEVEL Adjustment
RV201

front side

– 51 –

•

TP2

TP1

CONTRAST Adjustment

RV801

CN502

– 52 –

m

Pin No.

Pin Name

I/O

Function

1

ENC Ð

I

Rotary encoder input from the rotary commander

2

NCO

O

Not used (open)

3

NCO

O

Not used (open)

4

AVSS

Ñ

Ground terminal (for A/D conversion)

5

NCO

O

Not used (open)

6

NCO

O

Not used (open)

7

AVREF1

I

Reference voltage input terminal (+5V) (for D/A conversion)

8

NCO

O

9

NCO

O

10

NCO

O

11

NCO

O

12

EEP SCK

O

Serial data transfer clock signal output to the EEPROM (IC515)

13

EEP SDA

I/O

Two-way data bus with the EEPROM (IC515)

14

BUSY-MA

O

Not used (open)

15

BUSY-TU

O

Not used (open)

16

UNISI

I

Serial data input from the bus interface (IC503) (for SONY bus)

17

UNISO

O

Serial data output to the bus interface (IC503) (for SONY bus)

18

UNICKI

I

Serial data transfer clock signal input for the bus interface (for SONY bus)

19

UNICKO

O

Serial data transfer clock signal output to the tuner controller (IC502), bus interface (IC503)
(for SONY bus), and FM character multiple broadcast display controller (IC802)

20

BUS ON

O

Bus on/off control signal output to the tuner controller (IC502), bus interface (IC503) (for
SONY bus), and FM character multiple broadcast display controller (IC802)    ÒLÓ: bus on

21

SYS RST

O

Reset signal output to the tuner controller (IC502), bus interface (IC503) (for SONY bus), and
FM character multiple broadcast display controller (IC802)    ÒLÓ: reset

22

KEY ACT

O

Key active control signal output terminal (for A/D conversion power control)
When KEY ACK (pin ^∞) is active, ÒLÓ is output to enable signal input

23

TX-SEL

O

Not used (open)

24

NCO

O

25

NCO

O

Not used (open)

26

NCO

O

27

CAUTION

I

28

TIMPOL

I

Input terminal to set whether time polling is provided or not
ÒHÓ: provided, ÒLÓ: none (fixed at ÒLÓ)

29

TEL MUT

I

Telephone mute signal input terminal    At input of ÒLÓ, the signal is attenuated by Ð20 dB

30

VOL STP

I

Not used (fixed at ÒLÓ)

31

NCO

O

Not used (open)

32

MUTE

O

Mute control signal output of the tuner audio signal    ÒHÓ: mute on

33

VSS

Ñ

Ground terminal

34

NCO

O

35

NCO

O

36

NCO

O

37

NCO

O

38

NCO

O

39

NCO

O

Not used (open)

Not used (open)

Input terminal to set whether a caution alarm (buzzer sounds if the front panel is not removed
when accessory power is in off status) sounds or not
ÒHÓ: not sound, ÒLÓ: sounds (fixed at ÒLÓ)