DOWNLOAD Sony MCE-SV7 / MHC-SV7AV Service Manual ↓ Size: 6.4 MB | Pages: 52 in PDF or view online for FREE

8

2

connector
(CN401)

1

wire (flat type) (13 core)
(CN301)

2

two connectors
(CN101, 102)

5

MAIN board

3

screw
(BVTP3 

×

 8)

4

lug

3

screw
(BVTP3 

×

 8)

2

connector
(CN701)

3

two screws
(BVTP3 

×

 8)

2

three screws
(BVTP3 

×

 8)

3

two claws

1

connector
(CN401)

4

front panel section

3

claw

9

5

two claws

4

four screws
(BVTP2.6 

×

 8)

6

SUB PANEL board

1

five screws
(BVTP2.6 

×

 8)

3

PANEL board

2

two claws

3

lid (CD)

4

spring (CD)

1

screw
(BVTP2.6 

×

 8)

2

bracket (LID) assy

10

Use following buttons in the test mode.

no mark : Button of video CD unit (MCE-SV7)

*1

: Button of amplifier unit (TA-SV7AV)

*2

: Button of tuner unit (ST-SV7)

• This mode moves the optical pick-up to the position durable to

vibration. Use this mode when returning the set to the customer
after repair.

Procedure:
1. Press the 

/

1 

*

1

 button to turn the power on.

2. Turn the 

[FILE SELECT]

 *

1

 knob to set the CD function.

3. While pressing the 

[EQ ON/OFF]

 *

1

 button, press the 

/

1

 *

1

button.

4. The message “LOCK” is displayed on the fluorescent indica-

tor tube of tuner unit and turn the power off automatically, and
the CD delivery mode is set.

Procedure 1:
1. Press the 

/

1

 *

1

 button to turn the power on.

2. While pressing the both 

[PLAY MODE]

 and 

[   ]

 buttons, press

the 

[   ]

 (DISC 1) 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 

[STEREO/MONO]

 *

2

 and

[CINEMA STUDIO C]

 *

1 

buttons, press the 

[CLOCK/TIMER]

*

2

 button.

3. LEDs and fluorescent indicator tube are all turned on of all

units.

Procedure:
1. Enter the GC test mode.
2. Each time the 

[DISC 1]

 or 

[TUNER MEMORY]

 *

2

 button is

pressed, microcomputer or mechanism deck version is dis-
played of each unit.

3. Press the 

[DISC 3]

 or 

[TUNING +]

 *

2

 button to detail is dis-

played the version.

Procedure:
1. Enter the GC test mode.
2. Press the 

[DISC 2]

 or 

[TUNING  --]

  *

2

 button to set the key

check mode, and displays “K 0 J 0 V 0” on the fluorescent
indicator tube of tuner unit.

3. All buttons are pressed of video CD unit, all LEDs are blink-

ing of video CD unit. (not change the display of fluorescent
indicator tube)

To release from this mode, press three buttons in the same manner
as entering this mode or disconnect the power cord.

x

Z

• This mode can run the CD sled motor optionally. Use this mode,

for instance, when cleaning the optical pick-up.

Procedure:
1. Press the 

/

1

 *

1

 button to turn the power on.

2. Turn the 

[FILE SELECT]

 *

1

 knob to set the CD function.

3. While pressing the both 

[PLAY MODE]

 and 

[   ]

 buttons, press

the 

[      ]

 button.

4. Set to the CD service mode.
5. With the CD in stop status, press the 

[      ]

 button to move the

optical pick-up to outside track, or press the 

[     ]

 button to

inside track.

6. To release from this mode, perform as follows.

1) Move the optical pick-up to the most inside track.
2) Disconnect the power cord.

• Always move the optical pick-up to most inside track when

releasing from this mode. Otherwise, a disc will not be un-
loaded.

• Do not run the sled motor excessively, otherwise the gear can

be chipped.

• This mode can cancel the CD repeat limitation (5 times).
Procedure:
1. Press the 

/

1

 *

1

 button to turn the power on.

2. Turn the 

[FILE SELECT]

 *

1

 knob to set the CD function.

3. While pressing the both 

[PLAY MODE]

 and 

[   ]

 buttons, press

the 

[REPEAT]

 button.

4. CD repeat limitation is canceled.
5. To release this mode, disconnect the power cord.

x

.

M

m

x

11

11

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

Ω

 impedance.

4. Clean the object lens by an applicator with neutral detergent

when the signal level is low than specified value with the
following checks.

Procedure :
1. Connect an oscilloscope to TP (FEO) and TP (DVC).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Load the disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search)

5. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 4 

±

1 Vp-p.

7. After check, remove the lead wire connected in step 2.

• Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Procedure :
1. Connect an oscilloscope to TP (RFAC) and TP (DVC).
2. Turn Power switch on.
3. Load the disc (YEDS-18) and playback.
4. Confirm that the oscilloscope waveform is clear and check RF

signal level is correct or not.

5. Measure the RFDC in the same way.

±

TP (RFAC) or TP(RFDC)
TP(DVC)

BD board

oscilloscope

Clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

RF signal waveform

Procedure:
1.

Connect an oscilloscope to TP (TEO) and TP (DVC).

2.

Turn Power switch on.

3.

Load the disc (YEDS-18) and playback the number five track.

4.

Press the  X  button. (Becomes the 1track jump mode.)

5.

Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.

1 track jump waveform

Specification level:      

x

 100=less than 

±

22%

6.

After check, remove the lead wire connected in step 1.

Procedure :
1.

Connect a frequency counter to TP (XPCK) and GND.

2.

Turn Power switch on.

3.

Load the disc (YEDS-18) and playback the number five track.

4.

Confirm that the reading on frequency counter is 4.3218MHz.

A

B

±

±

[ BD BOARD ] — SIDE B —

TP (DVC)

TP (FEO)

TP (XPCK)

TP (TEO)

TP (RFDC)

TP (VC)

TP 

(RFAC)

IC103

IC101

TP (FEI)

R120

Procedure:
1. Connect a frequency counter to TP (27MHz) and TP (GND).
2. Turn power switch on.
3. Turn the 

[FUNCTION]

 knob of amplifier unit (TA-SV7AV) to

set the CD function.

4. Adjust CT503 on the VMP board so that the frequency counter

reading 27.0 MHz 

±

 80 Hz at stop status.

[VMP BOARD] (SIDE A)

J301

CN501

CN502

IC507

TP (GND)

TP (27MHz)

CT503
Video 
Frequency
Adjustment

VMP board

TP (27MHz)
TP (GND)

frequency counter