DOWNLOAD Sony MHC-SV7AV / ST-SV7 Service Manual ↓ Size: 3.11 MB | Pages: 34 in PDF or view online for FREE

Model
MHC-SV7AV ST-SV7
Pages
34
Size
3.11 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mhc-sv7av-st-sv7.pdf
Date

Sony MHC-SV7AV / ST-SV7 Service Manual ▷ View online

7
ST-SV7
3-5.
TUNER  PACK  (FM/AM)
3-4.
PANEL BOARD,  SIRCS  BOARD
6
SIRCS board
2
two screws
(BVTP2.6 
×
 8)
2
four screws
(BVTP2.6 
×
 8)
4
PANEL board
1
wire (flat type) (19 core)
(CN602)
3
two claws
5
two claws
3
tuner pack (FM/AM)
2
two screws
(BVTP3 
×
 8)
1
wire (flat type) (11 core) 
(CN506)
8
ST-SV7
4
screw
(BVTP3 
×
 8)
2
five connectors
(CN510, 5031, 5032, 5041, 5042)
        
1
wire (flat type) (23 core)
(CN508)
1
wire (flat type) (21 core)
(CN509)
6
MAIN board
1
wire (flat type) (19 core)
(CN502)
5
PC board holder
2
connector
(CN601)
3
three screws
(BVTP3 
×
 8)
4
two screws
(BVTP3 
×
 8)
1
wire (flat type) (23 core)
(CN603)
4
three screws
(BVTP3 
×
 8)
3
three screws
(BVTP3 
×
 8)
6
DSP board
1
wire (flat type) (21 core)
(CN602)
2
connector
(CN601)
5
PC board holder
3-7.
DSP  BOARD
3-6.
MAIN  BOARD
9
ST-SV7
[GC Test  Mode]
Enter the GC Test Mode mode
Procedure 1:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[STEREO/MONO]
 and 
[CINEMA
STUDIO C]
*
1
  buttons, press the 
[CLOCK/TIMER]
 button.
3. LEDs and fluorescent indicator tube are all turned on of all
units.
Procedure 2:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[PLAY MODE]
*
2
 and
x
 *
2
  buttons,
press the
Z
(DISC 1)*
2
 button.
3. LEDs and fluorescent indicator tube are all turned on of all
units.
Version Display Mode
Procedure:
1. Enter the GC test mode.
2. Each time the 
[TUNER MEMORY]
 or 
[DISC 1]
*
2
 button is
pressed, microcomputer or mechanism deck version is
displayed of each unit.
3. Press the 
[TUNING +]
 or 
[DISC 3]
*
2
 button to detail is displayed
the version.
Key Check Mode
Procedure:
1. Enter the GC test mode.
2. Press the 
[TUNING -- ]
 or 
[DISC 2]
*
2
 button to set the key check
mode.
3. In the key check the mode, the fluorescent indicator tube
displays “K 0 J 0 V 0” . Each time a button is pressed, “K”
value increases. However, once a button is pressed, it is no
longer taken into account.
VACS Level Display Mode
Procedure:
1. Enter the GC test mode.
2. Press the 
[TUNING +]
 or 
[DISC 3]
*
2
 button to display VACS
level on the fluorescent indicator tube.
Segment Check Mode
Procedure:
1. Enter the GC test mode.
2. Press the 
[ENTER]
 or
x
 *
2
 button to set the segment check
mode.
3. In the segment check the mode.  
Each  [ENTER]
 or
x
*
2
button is pressed, the fluorescent indicator tube displays is
switching variously.
Releasing the GC Test Mode
• To release from this mode, press three buttons in the same manner
as entering this mode or disconnect the power cord.
Note:
 Use following buttons in the test mode.
no mark : Button of tuner unit (ST-SV7)
*
1
: Button of amplifier unit (TA-SV7AV)
*
2
: Button of CD unit (MCE-SV7)
[MC Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure 1:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the 
[DIGITAL]
*
1
 button, press the
[DISPLAY]
button.
3. The set is reset, and becomes standby state.
Procedure 2:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[PLAY MODE]
*
2
 and
x
 *
2
 buttons,
press the
M
 *
2
 button.
3. The set is reset, and becomes standby state.
[MC Hot Reset]
• This mode resets the set with the preset data kept stored in the
memory. The hot reset mode functions same as if the power
cord is plugged in and out.
Procedure 1:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[STEREO/MONO]
 and 
[CINEMA
STUDIO C]
*
1
 buttons, press the 
[TIMER SELECT]
button.
3. The set is reset, and becomes standby state.
Procedure 2:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[PLAY MODE]
*
2
 and
x
*
2
 buttons,
press the
m
 *
2
 button.
3. The set is reset, and becomes standby state.
[Change-over the AM Tuning Interval]
(EXCEPT Sauidi Arabia model)
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. Turn the 
[FUNCTION]
 *
1
 knob to select 
“TUNER”, and press
the 
[TUNER/BAND]
 button to select the BAND “AM”.
3. Press the
?
/
1
*
1
 button to turn the power OFF.
4. While pressing the 
[ENTER]
 button, press the
?
/
1
*
1
 button,
and the display on the fluorescent indicator tube changes to
“AM 9 K STEP” or “AM 10 K STEP”, and thus the tuning
interval is changed over.
[Change-over of VACS ON/OFF]
1. Press the
?
/
1
*
1
 button to turn the power ON.
2. While pressing the both 
[STEREO/MONO]
 and 
[CINEMA
STUDIO C]
*
1
  buttons, press the 
[CINEMA STUDIO B]
 button,
and VACS ON/OFF is change over.
SECTION  4
TEST  MODE
10
ST-SV7
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
5
: fusible resistor.
C
: panel designation.
5-1.
NOTE  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC  DIAGRAMS
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.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
SECTION  5
DIAGRAMS
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
A
: B+ Line.
B
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
(
) : CD PLAY
〈〈
 
〉〉
: AC OFF
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: TUNER (FM/AM)
E
: TAPE PLAY
G
: RECORD
J
: CD PLAY
c
: DIGITAL INPUT
N
: MIC INPUT
• Abbreviation
EA
: Saudi Arabia model
SP
: Singapore model
TH
: Thailand model
• Circuit Boards Location
DSP board
TUNER PACK
MAIN board
SIRCS board
PANEL board
Page of 34
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