Change of specified value for bias adjustment according
to change in MAIN board
In this set, MAIN board has been changed in the midway of production.
Moreover, specified value for bias adjustment has been changed at the same
time as changing MAIN board.
Only new MAIN board and bias adjustment corresponding to new MAIN board
have been described.
Refer to original service manual for other information.
1.NEW/FORMER DISCRIMINATION
AEP Model
UK Model
E Model
Australian Model
Chinese Model
STR-DB790
Perform after confirming which type set of the repair referring to the following.
Printed on SilkRemark
Former type1-688-629-11, -12Refer to original service manual
New type1-688-629-13, -14, -15Refer to service manual supplement-1
Note 1:In original service manual, only suffix-11 has been described.
Note 2:In service manual supplement-1, only suffix-15 has been described.
1. Connect a digital voltmeter to the CN432 (CN482, CN532,
CN582, CN632, CN682) on the MAIN board or CN732 on
the SBL board (STR-DA1000ES only).
2. Press the
I/1 button to turn on the main power.
3. Adjust the RV431 (RV481, RV531, RV581, RV631, RV681)
on the MAIN board or RV731 on the SBL board (STRDA1000ES only) so that the digital voltmeter reading is 8±2
mV.
Note: When the adjusting voltage is higher than 8±2 mV, adjust the v oltage
to the minimum voltage.
Adjustment and Connection Loacation:
– MAIN BOARD (Component Side) –
1
CN732
2
RV734
RV431
2 1
CN432
RV481
CN482
2 1
RV631
CN632CN682
2 12 1
RV681
CN532
RV531RV581
2 1
CN582
2 1
2
3.DIAGRAMS
• Note for Printed Wiring Boards and Schematic Diagrams
STR-DA1000ES/DB790
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor
Q
B
CE
These are omitted.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
• 2 : nonflammable resistor.
Note:
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part
number specified.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : TUNER
• Voltages are tak en with a V OM (Input impedance 10 MΩ).
Voltage var iations may be noted due to normal production tolerances.
• Signal path.
F: TUNER
J: AUDIO (ANALOG)
E: VIDEO
• Abbreviation
AUS: Australian model
CH: Chinese model
KR: Korean model
MY: Malaysia model
SP: Singapore model
TW: Taiwan model
4
W or less unless otherwise
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.