DOWNLOAD Sony HCD-V4800 / LBT-V4800 / LBT-V4800R Service Manual ↓ Size: 1.32 MB | Pages: 67 in PDF or view online for FREE

– 13 –

1

two screws
(PTPWH M2.6 

×

 6)

3

two springs

5

screw
(BVTP 2.6 

×

 8)

7

BD board

4

flat wire (16 core)
(CN102)

3

two springs

2

optical pick-up
section

1

two screws
(PTPWH M2.6 

×

 6)

6

Removal
four solders.

limit switch
(S101)

3

optical pick-up (KSS-213D/Q-NP)

6

spindle motor
(M101)

2

sled shaft

1

claw

5

sled motor
(M102)

4

two screws
(P2 

×

 3)

– 14 –

5

two scres
(BTP 2.6 

×

 8)

7

Removal the capstan motor (M1)
to direction of the arrow 

B

.

4

Break the soldering
of motor lead.

6

claw

8

Hang two belts.

3

Removal the AUDIO board
to direction of the arrow 

A

.

2

four screws
(BTP 2.6 

×

 4)

1

connector
(CN651)

A

B

– 15 –

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. Press three buttons GROOVE ,  ENTER/NEXT , and

DISC 1 simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

CD DELIVERY MODE
• This mode moves the pick-up to the position durable to vibra-

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

Procedure:
1. Press POWER button to turn the set ON.
2. Press PLAY MODE button and POWER button simulta-

neously.

3. A message “LOCK” is displayed on the fluorescent indicator

tube, and the CD delivery mode is set.

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. Press three buttons GROOVE , ENTER/NEXT , and

DISC 2 simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

SLED SERVO MODE
• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pick-up.

Procedure:
1. Select the function “CD”.
2. Press three buttons GROOVE , ENTER/NEXT , and

CD FLASH  simultaneously.

3. The Sled Servo mode is selected, if “CD” is blanking on the

fluorescent indicator tube.

4. With the CD in stop status, press

) button in CD section to

move the pick-up to outside track, or

0 button to inside track.

5. To exit from this mode, perform as follows:

1) Move the pick-up to the most inside track.
2) Press three buttons in the same manner as step 2.

Note:
• Always move the pick-up to most inside track when exiting from this

mode.  Otherwise, a disc will not be unloaded.

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

CHANGE-OVER  OF  AM  TUNER  STEP  BETWEEN  9 kHz
AND 10 kHz
• A step of AM channels can be changed over between 9 kHz and

10 kHz.

Procedure:
1. Press POWER button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND

button to select the BAND “AM”.

3. Press POWER button to turn the set OFF.
4. Press ENTER/NEXT and POWER buttons simultaneously,

and the display of  fluorescent indicator tube changes to “AM 9
k STEP” or “AM 10 k STEP”, and thus the channel step is
changed over.
Be sure not to change with carelessness.

LED AND FLUORESCENT INDICATOR TUBE ALL LIT, KEY
CHECK MODE
Procedure:
1. Press three buttons GROOVE , ENTER/NEXT , and

DISC 3 simultaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press DIRECTION button, and the key check mode is acti-
vated.

3. In the key check mode, the fluorescent indicator tube displays

“K 1 J0 V0”.  Each time a button is pressed, “K”value increases.
However, once a button is pressed, it is no longer taken into
account.
“J” value increases like 1, 2, 3 ... if rotating JOG dial knob in
“+”  direction, or it decreases like 0, 9, 8 ... if rotating in “–”
direction.
“V” value increases like 1, 2, 3 ... if rotating VOLUME knob
in “+”  direction, or it decreases like 0, 9, 8 ... if rotating in “–”
direction.

4. To exit from this mode, press three buttons in the same manner

as step 1, or disconnect the power cord.

SELF-DIAGNOSIS
This model has the self-diagnosis function for the video and audio
decoder sections.
Immediately after the power on, the self-diagnosis function
searches each operation of IC’s around the mechanism controller
(IC701).
The LED (D701) on the VIDEO board indicates their results.

 (SIDE-A)

IC701

IC201

D701

IC771

IC901

LED (D701) INDICATION

SYMPTOM

Light

No error

1 time blinking (Repeatedly)

External RAM (S-RAM) error
 (IC751)

2 times blinking (Repeatedly)

Video decoder section error
(IC201)

3 times blinking (Repeatedly)

Video RAM (D-RAM) error
(IC251)

4 times blinking (Repeatedly)

Audio decoder section error
(IC201)

– 16 –

7. In the aging mode, the aging is executed in a sequence given

in “2-2.  Operation during Aging Mode”.
The aging continues unless an alarm occurred.

8. To exit from the aging mode, press POWER button to turn

the set OFF.

2-2.  Operation during Aging Mode
In the aging mode, the program is executed in the following se-
quence.

1. A tape on FWD side is played for one minute.
2. PAUSE STOP is made.
3. Recording is made for 3 minutes. (For the deck not having

the record function, the play is executed.  In this case,

·

LED does not light up.)

4. FF is executed up to the end of tape.
5. A tape is reversed, and the tape on REV side is played for

one minute.

6. PAUSE STOP is made.
7. Recording is made for 3 minutes.  (For the deck not having

the record function, the play is executed.  In this case,

ª

LED does not light up.)

8. FF is executed up to the end of tape.
9. Steps 1 through 8 are executed for the other deck.
10. Steps 1 through 9 are repeated unless an alarm occurred.

2-3.  Deck Selection Sequence
• During the aging mode, decks are selected in the following se-

quence:

Deck A (FWD) 

→

 Deck A (REV)

↑

↓

Deck B (REV) 

←

 Deck B (FWD)

AGING MODE
This mode can be used for operation check of CD section and tape
deck section.
• If an error occurred:

The aging operation stops.

• If no error occurs:

The aging operation continues repeatedly.

1. Aging Mode in CD Section
1-1.  Operating Method of Aging Mode

1. Set discs in DISC 1 and DISC 3 trays.
2. Select the function “CD”.
3. Press three buttons GROOVE , ENTER/NEXT ,

and DISC 5  simultaneously.

4. The aging mode is activated, if a roulette mark on the fluo-

rescent indicator tube is blinking.

5. In the aging mode, the aging is executed in a sequence given

in “1-2. Operation during Aging Mode”.
The aging continues unless an alarm occurred.

6. To exit from the aging mode, press POWER button to turn

the set OFF.

• If a button other than buttons In CD section is pressed during

aging, the aging in the CD section is finished.

• To execute aging to the tape deck section successively, press

·

button in the deck A.
“AGING” is displayed on the fluorescent indicator tube.  (For the
aging in tape deck, see “2. Aging Mode in Tape Deck Section”.

1-2.  Operation during aging Mode
In the aging mode, the program is executed in the following se-
quence.

1. The disc tray turns to select a disc. (For a disc selection

sequence, see Section 1-3.)

2. TOC of disc is read.
3. The pick-up accesses to the last track.
4. Steps 1 through 3 are repeated.

1-3.  Disc Selection Sequence
• During the aging mode, discs are selected in the following se-

quence:

Disc 1 

→

 Disc 3

 

↑

↓

Disc 3 

←

 Disc 1

2. Aging Mode in Tape Deck Section
2-1.  Operating Method of Aging Mode

1. Load a commercially available 10-minute tape into the decks

A and B respectively.
(If a 10-minute tape is not available, another tape may be
used but a cycle time will be longer.)

2. Select the function “TAPE”.
3. Rewind tapes in advance by pressing

0 button respec-

tively on decks A and B.

4. Press three buttons GROOVE , ENTER/NEXT ,

and DISC 5  simultaneously.

5. Press

· button on deck A.  (This button triggers the ag-

ing mode.)

6. The aging mode is activated if “AGING A” is displayed on

the fluorescent indicator tube.