Sony STR-K402 Service Manual ▷ View online
3
STR-K402
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE WITH
MARK
0
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.
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1.
A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2.
A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
digital multimeter is suitable for this job.
3.
Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15
µF
1.5 k
Ω
AC
Voltmeter
(0.75 V)
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
1. GENERAL
·········································································· 4
2. TEST MODE
······································································ 6
3. DIAGRAMS
3-1.
Circuit Boards Location ··············································· 8
3-2.
Block Diagram Main Section ····································· 9
3-3.
Block Diagram Display Section ······························· 10
3-4.
Schematic Diagram Main Section (1/3) ··················· 11
3-5.
Schematic Diagram Main Section (2/3) ··················· 12
3-6.
Schematic Diagram Main Section (3/3) ··················· 13
3-7.
Printed Wiring Board Main Section ························· 14
3-8.
Schematic Diagram Digital Section ························ 15
3-9.
Printed Wiring Board Digital Section ······················ 16
3-10. Schematic Diagram Display Section ······················· 17
3-11. Printed Wiring Board Display Section ····················· 18
3-12. Schematic Diagram Video Section ·························· 19
3-13. Printed Wiring Board Power Section ······················· 19
3-14. Printed Wiring Board Video Section ························ 19
3-15. IC Block Diagrams ····················································· 20
3-16. IC Pin Function Description ······································ 21
3-11. Printed Wiring Board Display Section ····················· 18
3-12. Schematic Diagram Video Section ·························· 19
3-13. Printed Wiring Board Power Section ······················· 19
3-14. Printed Wiring Board Video Section ························ 19
3-15. IC Block Diagrams ····················································· 20
3-16. IC Pin Function Description ······································ 21
4. EXPLODED VIEWS
······················································ 23
4-1.
Front Panel Section ···················································· 23
4-2.
Chassis Section ·························································· 24
5. ELECTRICAL PARTS LIST
······································· 25
4
STR-K402
SECTION 1
GENERAL
This section is extracted
from instruction manual.
from instruction manual.
5
STR-K402
6
STR-K402
SECTION 2
TEST MODE
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed.
* Procedure:
* Procedure:
While depressing the TUNER and the VIDEO buttons
simultaneously, press the power ?/1 button to turn on the main
power. The model name, destination and the software version are
displayed.
simultaneously, press the power ?/1 button to turn on the main
power. The model name, destination and the software version are
displayed.
FLUORESCENT INDICATOR TUBE TEST MODE
* All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
one after another.
* Procedure:
While depressing the TV/SAT and the DVD/LD buttons
simultaneously, press the power ?/1 button to turn on the main
power.
simultaneously, press the power ?/1 button to turn on the main
power.
1. All segments turn on.
NAME , SURR and SOUND FIELD MODE LED turn on.
2. Press the VIDEO button, confirm display
Digital Cinema Sound, SET UP and 2CH LED turn on.
3. Press the VIDEO button, confirm display
MULTI CHANNEL DECODING(blue), LEVEL and A.F.D.
LED turn on.
LED turn on.
4. Press the VIDEO button, All segments turn off.
5. Every pressing of the VIDEO button turns on each segment and
LED one after another in the same order.
(Not only the VIDEO button, but also the other buttons such as
DVD/LD , TV/SAT , MD/TAPE , CD , TUNER can be used.)
(Not only the VIDEO button, but also the other buttons such as
DVD/LD , TV/SAT , MD/TAPE , CD , TUNER can be used.)
FACTORY SET MODE
* All preset contents are reset to the default setting.
* Procedure:
* Procedure:
While depressing the VIDEO and the CD buttons simultaneously,
press the power ?/1 button to turn on the main power. The
message FACTORY appears and switch off the set.
While depressing the VIDEO and the CD buttons simultaneously,
press the power ?/1 button again. The message FACTORY
appears and the present contents are reset to the default values.
press the power ?/1 button to turn on the main power. The
message FACTORY appears and switch off the set.
While depressing the VIDEO and the CD buttons simultaneously,
press the power ?/1 button again. The message FACTORY
appears and the present contents are reset to the default values.
SOUND FIELD CLEAR MODE
* The preset sound field is cleared when this mode is activated.
Use this mode before returning the product to clients upon
completion of repair.
completion of repair.
* Procedure:
While depressing the SOUND FIELD MODE button, press the
power ?/1 button to turn on the main power. The message
S. F. CLR appears and initialization is performed.
power ?/1 button to turn on the main power. The message
S. F. CLR appears and initialization is performed.
AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE
SELECTION MODE
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button or the
PRESET TUNING+ button, press the power ?/1 button to turn
on the main power. Either the message 9 k STEP or 10 k STEP
appears. Select the desired step.
While depressing the TUNING+ button or the
PRESET TUNING+ button, press the power ?/1 button to turn
on the main power. Either the message 9 k STEP or 10 k STEP
appears. Select the desired step.
KEY CHECK MODE
* Button check
* Procedure:
* Procedure:
While depressing the SURR and the A.F.D buttons simultaneously,
press the power ?/1 button to turn on the main power.
“REST 36” appears.
Every pressing of any button other than ?/1 counts down the
buttons. The buttons which are already counted once are not
counted again. When all buttons are pressed “REST 00” appears.
When MASTER VOLUME is rotated in clockwise direction,
“VOL MIN”, “VOL 1” to “VOL 30”, “VOL MAX” appear.
press the power ?/1 button to turn on the main power.
“REST 36” appears.
Every pressing of any button other than ?/1 counts down the
buttons. The buttons which are already counted once are not
counted again. When all buttons are pressed “REST 00” appears.
When MASTER VOLUME is rotated in clockwise direction,
“VOL MIN”, “VOL 1” to “VOL 30”, “VOL MAX” appear.
SW
L
SL
C
R
S
SR
SLEEP
SP.OFF
( ( ( L F E ) ) )
DIGITAL
OPT COAX MULTI CH IN
PRO LOGIC DTS MPEGSTEREO MONO RDS
MEMORY
MUTING
INFO
NEWS
TA
EQ
D.RANGE
D D
dB
kHz
mft.
MHz
SW
L
R
S
SLEEP
L F E
COAX
PRO LOGIC
MPEGSTEREO
RDS
MUTING
INFO
TA
D.RANGE
D D
k
m
MHz
SL
C
SR
SP.OFF
( ( ( ) ) )
DIGITAL
OPT
MULTI CH IN
DTS
MONO
MEMORY
NEWS
EQ
dB
Hz
ft.
ft.