DOWNLOAD Sony STR-DB1070 / STR-DB870 Service Manual ↓ Size: 8.4 MB | Pages: 92 in PDF or view online for FREE

Model
STR-DB1070 STR-DB870
Pages
92
Size
8.4 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
str-db1070-str-db870.pdf
Date

Sony STR-DB1070 / STR-DB870 Service Manual ▷ View online

11
STR-DB870/DB1070
3-6.
MAIN  BOARD
3
two screws
(BVTP3 
× 
8)
3
two screws
(BVTP3 
× 
8)
4
screw (BVTP3 
× 
8)
4
screw (BVTP3 
× 
8)
2
five screws 
(BV/RING)
1
connector 
(CN805)
1
connector 
(CN804)
1
connector (CN802)
1
connector 
(CN803)
5
6
connector (CN810)
7
ten screws
(transistor)
6
five connector
(CN501, 551, 451, 401, 601, 651)
9
MAIN board
8
heat sink
12
STR-DB870/DB1070
SECTION  4
TEST  MODE
Factory Set Mode
All preset contents are reset to the default setting.
Procedure:
While pressing the 
[SET UP]
 and 
[DIMMER]
 buttons, press the
 
I
/1
button to turn on the main power. The message “TUNER FAC-
TORY PRESET” appears and the present contents are reset to the
default values.
All Clear 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:
While pressing the 
[A.F.D.]
 and 
[MODE +]
 buttons, press the
 
I
/1
button to turn on the main power. The message “MEMORY
CLEARED” appears and the memories are reset to the default val-
ues.
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:
While pressing the 
[MODE +]
 button, press the
I
/1
button to turn
on the main power. The message “S.F Initialize” appears and ini-
tialization is performed.
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.
Procedure:
1. While pressing the 
[A.F.D.]
 and 
[DIMMER]
 buttons, press
the
I
/1
button to turn on the main power.
2. All segments turn on at the same time, then each segment turns
on press the 
[A.F.D.]
 button.
Demonstration Mode
Procedure:
While pressing the 
[SET UP]
 button simultaneously, press the
 
I
/1
button to turn on the main power. The set enters the DEMO
mode.
Wait a while, then the demonstration starts. If the
I
/1
button is
pressed often the demonstration has started, the power is turned
off, and the demonstration resumes if the
I
/1
button is pressed
again.
AM Channel Step 9 kHz/10 kHz Selection Mode
(US, Canadian and E Models)
Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
Procedure:
1. Set the FUNCTION to AM. Press the
I
/1
button to turn off
the main power.
2. While depressing the 
[PRESET TUNING +]
 button, press the
I
/1
button to turn on the main power.
3. Either the message “AM 9 kHz Step” or “AM 10 kHz Step”
appears. Select the desired step.
Version Mode
When this mode is used, the microprocessor version number is
displayed.
Procedure:
Press three buttons of 
[SHIFT]
[MODE +]
 and 
[TUNING --]
 si-
multaneously. The microprocessor version number appears.
DSP Test  Mode
This test is conducted to check if the DSP functions normally.
Procedure:
1. While pressing the 
[DISPLAY]
and 
[TUNING +]
 buttons, press
the
I
/1
button to turn on the main power.
2. If the DSP is normal, the message “RWS 1:000 2:000 SYNC”
appears.
3. If the DSP is abnormal, characters other than 0 appears at the
000 part of the message.
Note:
RWS characters of the message correspond to the digits of 000.
RW means read/write from the system controller (IC1703) to the
DSP, and S means the communication between DSP and S-RAM
(IC1502, IC1602). For example, if the writing of the system
controller failed, 0*0 (* is a character other than 0) appears. Also,
1 and 2 indicates DSP1 (IC1501) and DSP2 (IC1601), and 1:000
and 2:000 show the test results of DSP1 and DSP2 respectively.
Ver 1.2
13
STR-DB870/DB1070
SECTION  5
ELECTRICAL ADJUSTMENT
OSD Adjustment
(STR-DB1070 Model)
Connection
Procedure:
1. Short the CN306 pin 4 on the VIDEO board to the GND.
2. Connect a frequency counter to the CN306 pin 2 on the
VIDEO board.
3. Press the 
I
/1
button to turn on the main power.
4. Press the 
[SET UP]
 button.
5. Press the 
[<]
 or 
[>]
 button to display “COLOR”.
6. Turn the JOG DIAL to display “NTSC”.
7. Press the 
[>]
 button to display “OSD H.POSITION”.
8. Adjust the CT302 so that the frequency counter reading is
3.57954 MHz.
9. Press the 
[<]
 button to display “NTSC”.
10. Turn the JOG DIAL to display “PAL”.
11. Press the 
[>]
 button to display “OSD H.POSITION”.
12. Adjust the CT301 so that the frequency counter reading is
4.43361 MHz.
13. Press the 
I
/1
button to turn off the main power.
14. Connect a frequency counter to the CN306 pin 1 on the
VIDEO board.
15. Press the 
I
/1
button to turn on the main power.
16. Press the 
[SET UP]
 button.
17. Press the 
[>]
 button to display “OSD V.POSITION”.
18. Adjust the CT303 so that the frequency counter reading is 7.20
MHz.
Note:
The steps 5, 6 and 9 to 12 should be performed to the models except
for the US and Canadian.
Adjustment and Connection Loacation:
VIDEO board
CN306 pin 
1
 or pin 
2
+
frequency counter
IC304
IC310
CT303
CT302
CN306
1
4
CT301
Ver 1.2
– VIDEO BOARD (Component Side) –
14
STR-DB870/DB1070
MEMO
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