Sony STR-DB798 Service Manual ▷ View online
STR-DB798
9
3-5. DIGITAL BOARD, A/V SYNC BOARD
3
wire
(flat type)
(31 core)
(CN1105)
(flat type)
(31 core)
(CN1105)
6
connector
(CNS551)
(CNS551)
5
screw
(BVTP3
(BVTP3
×
8)
2
7
DIGITAL board
9
A/V SYNC board
8
A/V SYNC holder
1
two connectors
(CN402, 403)
(CN402, 403)
4
three connectors
(CN107, 1110, 1112)
(CN107, 1110, 1112)
qj
two connectors
(CN412, 413)
(CN412, 413)
3
screw
(PSW3
(PSW3
×
8)
1
connector
(CN178)
(CN178)
qd
connector
(CN408)
(CN408)
q;
connector
(CN301)
(CN301)
7
connector
(CN202)
(CN202)
8
connector
(CN201)
(CN201)
qs
connector
(CN853)
(CN853)
qf
S-VIDEO board
qa
VIDEO board
9
VIDEO-AU board
6
AU-IN board
qk
SPK-B board
qh
SPK-A board
2
STAY-5 board
4
lead wire
qg
two connectors
(CN448, 449)
(CN448, 449)
5
two connectors
(CN102, 103)
(CN102, 103)
3-6. STAY-5/AU-IN/VIDEO-AU/VIDEO/S-VIDEO/SPK-A/SPK-B BOARD
STR-DB798
10
3-7. MAIN BOARD BLOCK
3-8. MAIN BOARD
3
four screws
(BVTP3
(BVTP3
×
8)
1
connector
(CN418)
(CN418)
4
MAIN board block
1
three connectors
(CN907, 909, 910)
(CN907, 909, 910)
2
four screws
(BVTP3
(BVTP3
×
8)
5
five connectors
(CN401, 421, 501, 601, 651)
(CN401, 421, 501, 601, 651)
4
heat sink
assy
assy
3
two screws
(BVTP3
(BVTP3
×
8)
1
Remove fourty
two solders.
two solders.
7
MAIN board
6
A CLASS board
2
three connectors
(CN18, 28, 38)
(CN18, 28, 38)
11
STR-DB798
TUNER FACTORY PRESET MODE
All preset contents are reset to the default setting.
Procedure:
Procedure:
1. While pressing the [MUSIC] and [PRESET TUNING --] buttons,
press the
I
/1
button to turn on the main power.
2. The message “FACTORY” appears and the present contents
are reset to the default values.
TUNER AUTOBETICAL TUNING MODE
(AEP and UK models)
(AEP and UK models)
Procedure:
1. While pressing the [MEMORY/ENTER] button, press the
I
/1
button to turn on the main power.
2. The message “AUTO-BETICAL SELECT” appears and scans
and stores all the FM and FM RDS stations in the broadcast
area.
area.
3. When done, the message “FINISH” appears.
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.
Procedure:
this mode before returning the product to clients upon completion
of repair.
Procedure:
1. While pressing the [2CH] button, press the
I
/1
button to turn
on the main power.
2. The message “SF. CLR.” appears and initialization is
performed.
FLUORESCENT INDICATOR TUBE PATTERN
CHECK MODE
CHECK 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.
Procedure:
segments turn on at the same time, then each segment turns on one
after another.
Procedure:
1. While pressing the [PRESET TUNING --] and [A.F.D.] buttons,
press the
I
/1
button to turn on the main power.
2. All segments and [MULTI CHANNEL DECODING] indicator LED
turn on.
SHIPMENT MODE
All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
Procedure:
this mode before returning the product to clients upon completion
of repair.
Procedure:
1. While pressing the [PRESET TUNING --] and [SURR BACK
DECODING] buttons, press the
I
/1
button to turn ton the main
power.
2. The message “CLEARING” appears and memories are reset
to the default values and the main power turn off automatically.
SWAP ALL MODE
Procedure:
1. While pressing the [PRESET TUNING +] and [A.F.D.] buttons,
press the
I
/1
button to turn on the main power.
2. The message “SWAP” appears.
COMMAND MODE CHANGE MODE
The command mode of the remote-commander which this set
receives can be changed.
Procedure:
receives can be changed.
Procedure:
1. While pressing the [INPUT MODE] buttons, press the
I
/1
but-
ton to turn the main power.
2. Either the message “C.MODE.AV1” or “C.MODE.AV2”
appears. Select the desired mode.
VERSION CHECK MODE
The version of the micro computer displayed.
Procedure:
Procedure:
1. While pressing the [PRESET TUNING --] and [2CH] buttons,
press the
I
/1
button to turn the main power.
2. The version of the micro computer and model destination are
displayed.
DECODE AUTO ALL MODE
Procedure:
1. While pressing the [PRESET TUNING --] and [MOVIE] buttons,
press the
I
/1
button to turn the main power.
2. The message “DEC TEST” appears.
PROTECTOR AUTO OFF
When this mode is used, a protector on state is maintainable.
Procedure:
Procedure:
1. While pressing the [PRESET TUNING +] and [MOVIE] buttons,
press the
I
/1
button to turn on the main power.
2. The message “PROT EVER” appears.
SECTION 4
TEST MODE
12
STR-DB798
BIAS ADJUSTMENT
Condition:
input signal: no signal (no load)
volume:
input signal: no signal (no load)
volume:
minimum
Connection
Procedure:
1. Connect a digital voltmeter to the CN432 (CN482, CN532,
CN582, CN632, CN682, CN732) on the MAIN board.
2. Press the
I
/1
button to turn on the main power.
3. Adjust the RV431 (RV481, RV531, RV581, RV631, RV681,
RV731) on the MAIN board so that the digital voltmeter
reading is 15
reading is 15
±
2 mV.
Note:
When the adjusting voltage is higher than 15
±
2 mV, adjust the
voltage to the minimum voltage.
Adjustment and Connection Loacation:
+
–
–
digital voltmeter
CN432 (CN482, 532, 582, 632, 682, 732) pin
1
CN432 (CN482, 532, 582, 632, 682, 732) pin
2
CN432
CN482
CN532
CN582
CN632
CN682
RV581
RV531
RV631
RV681
RV481
RV731
CN732
2 1
2 1
2 1
2 1
2 1
1
2
2 1
RV431
– MAIN Board (Component Side) –
SECTION 5
ELECTRICAL ADJUSTMENTS
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