SONY ST-S3000ES - Service Manual Immediate Download

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AEP Model

SPECIFICATIONS

MICROFILM

FM STEREO FM-AM TUNER

ST-S3000ES

SERVICE MANUAL

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SECTION 1

GENERAL

TABLE OF CONTENTS

1. GENERAL ................................................................... 2

2. TEST MODE ................................................................ 3

3. ELECTRICAL ADJUSTMENT ..................................... 4

4. DIAGRAMS

4-1.

Waveforms .......................................................................... 7

4-2.

IC Block Diagrams ............................................................. 8

4-3.

Schematic Diagram -- Main Section -- ............................ 9

4-4.

Printed Wiring Board -- Main Section -- ....................... 13

4-5.

Printed Wiring Board -- Power Board Section -- ........... 15

4-6.

Schematic Diagram -- Power Board Section -- ............. 16

4-7.

Printed Wiring Board -- Display Section -- ................... 17

4-8.

Schematic Diagram -- Display Section -- ...................... 19

4-9.

IC Pin Function

· IC701 System Control (µPD780205GF) ....................... 21

5. EXPLODED VIEW .................................................... 23

6. ELECTRICAL PARTS LIST .................................... 24

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK

! OR DOTTED LINE

WITH MARK

! ON THE SCHEMATIC DIAGRAMS AND IN

THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS

WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS

MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

Location of Parts and Controls

911

1 POWER button

2 TUNING/SELECT button

3 TUNING/SELECT+ button

4 DISPLAY button

5 CHARACTER button

6 ANTENNA button

7 BAND button

8 MEMORY button

9 MENU ENTRY MENU button

10 MENU ENTRY RETURN button

11 MENU ENTRY ENTER button

12 TUNE MODE button

13 SHIFT button

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1. Circuit Check Mode

Set to the reception frequency that the circuit can STEREO RDS stations. (Set the input level to above 70 dB.)

This enables circuit check to be performed in any of the reception modes-FM, AM (MW, LW). Set to a desired band before setting the test

mode.

1. Turn OFF the power.

2. While pressing ENTER and BAND together, turn ON the power.

· The items in the following table will be checked automatically in order every 2 seconds.

SECTION 2

TEST MODE

Tuned

IF Frq

Sig Level

Stereo

RDS Signal

AST signal =LOW

IF COUNT OK

SI LEVELh70dB

ST signal=LOW

RDS DATA OK

OK or NG

IC251 NG, RV251 adjustments

FE101, IC251 NG, or IF count buffer amp (Q251, Q401) NG

IC221 NG, RV221 adjustments

IC301 NG, RV301 adjustments

IC801 NG

Display

Items

FM RDS

AM (MW, LW)

DISPLAY

NOTE : The preset data will be erased when this test mode is used. Therefore, take down the data before setting this mode and preset the data

again after completing operations in this mode.

2. FLUORESCENT INDICATOR TUBE Check and KEY Check mode

1. Turn OFF the power.

2. While pressing ENTER and RETURN together, turn ON the power.

3. While continuously pressing ENTER and RETURN together, check the following.

Indication test pattern

* The indication test patterns from 2 to 5 are indicated on only even grids.

The display changes every 1 sec.

1 7F

p p p p p

2 60

p p

3 7E

p p p p p

4 3D

p p p p p

5 5F

p p p p p

Microcomputer version indication (1 sec)

n All light up "7F" n Dot area only "60" n Dot area only "7E"

Dot area only "5F"

N Dot area only "3D"

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4. Release ENTER and RETURN . The KEY CHECK mode will be set.

5. All key numbers will be displayed.

Key Number : 12

6. Each time the key is pressed, the key number will be counted down.

Each key will be counted only once, at the first time.

7. When all keys have been pressed, the process will end.

NOTE : As contents of the Factory Preset will be written into memory after completing this check mode, delete contents of memory

according to 4. Forced RESET.

3. Entering the Factory Preset (In case perform just to write memory of the Factory Preset.)

1. Turn OFF the power.

2. While pressing ENTER and MEMORY together, turn ON the power.

4. Forced RESET (Used to delete the contents of Factory Preset when it is written into the preset memory.)

Clears all the RAMs and sets the initial state

1. Turn OFF the power.

2. While pressing ENTER and ANTENNA together, turn ON the power.

3. When "All clear" is indicated on the display tube.

SECTION 3

ELECTRICAL ADJUSTMENTS

Precautions in Repairing

If the front end unit fails, it is difficult to repair the inner circuits, so

replace the entire front end unit.

Set "IF : WIDE" after the all adjustments.

FM SECTION

0dB = 1µV

· Standard Setting of FM Stereo RF Signal Generator.

STEREO STANDARD SIGNAL

MONAURAL

STANDARD SIGNAL

Carrier frequency

: 98MHz

Modulation

: Audio 1kHz

Main channel (L+R) :33.75kHz

deviation

Sub channel (LR)

:33.75kHz

deviation

Pilot

:7.5kHz

deviation

Carrier frequency

: 98MHz

Modulation : Audio 1kHz

75kHz deviation

FM RF SSG

1 kHz

highpass

filter

distortion meter

FM ANTENNA (75

)

LINE OUT

set

How to switch IF BAND : WIDE/NARROW and ANT ATT :

ON/OFF

Method:

1. Press the power button to turn the power on and set to FM.

2. Press the MENU button and press the TUNING/SELECT , +

button to indicate "Reception" on the fluorescent display tube,

then press the ENTER button.

3. Press the TUNING/SELECT , + button to indicate "ATT/IF

Band", and press the ENTER button.

4. "ANT ATT: OFF" is indicated on the fluorescent display tube

and press the TUNING/SELECT , + button to indicate "ON"

or "OFF", then press the ENTER button.

When the ANT ATT is set, "ANT ATT" is indicated on the fluo-

rescent display tube.

5. "IF: Wide" is indicated on the fluorescent display tube, and press

the TUNING/SELECT , + button to indicate "Wide" or "Nar-

row", then press the ENTER button.

When the "IF: Narrow" is set, "NARROW" is indicated on the

fluorescent display tube.

6. Set WIDE after the operation.

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FM Discriminator ADJUSTMENT

(NULL and MONO Distortion Adjustment)

Setting :

IF BAND : WIDE

ANT ATT : OFF

FM RF SSG

1 kHz

highpass

filter

distortion meter

FM ANTENNA (75

)

LINE OUT

Modulation: Monaural Standard signal

Output level: 6mV (76dB) (at 75

open)

Procedure :

1. Tune the set to 98 MHz.

2. Adjust IFT252 for 0V reading on the digital voltmeter.

.................. NULL

3. Adjust IFT253 for a minimum reading on the distortion meter.

.................. MONO Distortion (THD)

4. Repeat the adjustments of 2 and 3 several times.

Note : When replacing the ceramic filter, perform this alignment.

TP251

NULL terminal

Digital Voltmeter

(DC range)

set

Stereo Level Adjustment

Setting :

IF BAND : WIDE

ANT ATT : OFF

FM RF SSG

set

FM ANTENNA (75

)

Modulation: Stereo Standard signal

Output level: 18µV (25dB) (at 75

open)

Procedure :

1. Tune the set to 98 MHz.

2. Adjust RV251 to the point (moment) when the "STEREO"

indicator will change from going off to going on.

FM RF SSG

set

FM ANTENNA (75

)

Modulation: Stereo Standard signal

Output level: 18µV (25dB) (at 75

open)

Narrow Gain Adjustment

Setting :

IF BAND : NARROW

ANT ATT : OFF

Procedure :

1. Tune the set to 98 MHz.

2. Set "IF BAND : NARROW" according to the procedure of "How

to switch IF BAND WIDE/NARROW" on page 6.

3. Adjust RV231 to the point (moment) when the "STEREO" indi-

cator will change from going off to going on.

FM Meter Level Adjustment

Setting :

IF BAND : WIDE

ANT ATT : OFF

FM RF SSG

FM ANTENNA (75

)

Modulation: Stereo Standard signal

Output level: 3mV (76dB) (at 75

open)

Procedure :

1. Tune the set to 98 MHz.

2. Press DISPLAY button to display the digital signal, then adjust

RV221 to be displayed as "SIG 70dB".

Stereo Separation Adjustment

Setting :

IF BAND : WIDE

set

FM RF SSG

FM ANTENNA (75

)

set

LINE OUT

level meter

Modulation: Stereo Standard signal

Output level: 6mV (76dB) (at 75

open)

Procedure :

1. Refer to "How to switch IF BAND WIDE/NARROW" on page

FM stereo

Signal generator

Output channel

Level meter

connection

Level meter

reading (dB)

L-CH

Adjust RV301 for minimum

reading on Level meter

R-CH

L-CH

R-CH

Adjust RV301 for minimum

reading on Level meter

L-CH

R-CH

L-CH Stereo separation : A - B

R-CH Stereo separation : C - D

The separations of both channels should be equal.