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1. GENERAL ááááááááááááááááááááááááááááááááááááááááááááááááááá\
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2. TEST MODE ááááááááááááááááááááááááááááááááááááááááááááááááááá\
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3. ELECTRICAL ADJUSTMENT ááááááááááááááááááááááááááááááááá 5
4. DIAGRAMS
4-1. Circuit Board Location ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááá 8
4-2. Schematic Diagram Ð DISPLAY SECTION Ð áááááááááááááááááá 9
4-3. Printed Wiring Board Ð DISPLAY SECTION Ð ááááááááááááá 11
4-4. Printed Wirng Board Ð TUNER SECTION Ð ááááááááááááááááá 13
4-5. Schematic Diagram Ð TUNER SECTION (1/2) Ð áááááááááá 15
4-6. Schematic Diagram Ð TUNER SECTION (2/2) Ð áááááááááá 17
4-7. IC Pin Function ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 19
4-8. IC Block Diagram ááááááááááááááááááááááááááááááááááááááááááááááááááá\
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6. EXPLODED VIEWS
6-1. Front Panel and Case Section ááááááááááááááááááááááááááááááááááááááááááá 21
6-2. Panel and Display Section áááááááááááááááááááááááááááááááááááááááááááááááá 22
7. ELECTRICAL PARTS LIST ááááááááááááááááááááááááááááááááááá 23
TABLE OF CONTENTS
SECTION 1
GENERAL
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.
PARTS No. MODEL
MODEL IDENTIFICATION
Ñ BACK PANEL Ñ
4-998-494-0¹
4-998-494-1¹ AEP model
UK model
yyyyyyyy
PART NO.
1 POWER swtich (U)
2 SHIFT button
3 Numeric button
4 Display window
5 DIRECT button
6 TUNING/SELECT knob
7 DISPLAY button
8 PTY button
9 TA button
0 NEWS/INFO button
!Á AUTO-BETICAL SELECT button
1 2 3 5 4 6
7 8 9 0 !Á !ª !£ !¢ !° !¤ !¦ !¥ !» @¼ @Á
Location of Controls
!ª MEMORY button
!£ BAND button
!¢ ON/OFF button
!° ANTENNA button
!¤ FM MODE button
!¦ CHARACTER button
!¥ MENU button
!» RETURN button
@¼ ENTER button
@Á TUNING MODE button
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SECTION 2
TEST MODE
1. Circuit Check Mode
Set to the reception frequency that the curcuit 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 4 and AUTO-BETICAL SELECT together, turn ON U .
·The items in the following table will be checked automatically in order every 2 seconds.
Display
Tuned
IF Frq
Sig Level
Stereo
RDS SignalItems
AST signal = LOW
IF COUNT OK
SI LEVELh 70dB
ST signal = LOW
RDS DATA OK
FM RDS
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
AM (MW, LW)
OK or NG
OK or NG
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
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. Display Tube Check and KEY Check mode
1. Turn OFF the power.
2. While pressing 1 and AUTO-BETICAL SELECT together, turn ON U .
3. While continuously pressing 1 and AUTO-BETICAL SELECT together, check the following.
Indication test pattern
* The indication test pattern from 2 to 5 are indicated on only even grids.
The display changes every 1 sec.
4. Release 1 and AUTO-BETICAL SELECT . The KEY CHECK mode will be set.
5. All key numbers will be displayed.
Key Number : 27
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.
Microcomputer version indication (1 sec) All light up 7F Dot area only 60 Dot area only 7E
Dot area only 3D Dot area only 5F
1 7F 2 60 3 7E 4 3D 5 5F
