Sony HCD-V808 User manual
MINI Hi-Fi COMPONENT SYSTEM
MICROFILM
SPECIFICATIONS
SERVICE MANUAL
HCD-V808
HCD-V808isthetuner,deck,VideoCDand
amplifier section in MHC-V808.
E Model
Chinese Model
CD
Section
Tape deck
Section
Model Name Using Similar Mechanism HCD-V4500
CD Mechanism Type
CDM38L-5BD21AL
Base Unit Name BU-5BD21AL
Optical Pick-up Name
KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-H881
Tape Transport Mechanism Type TCM-220WR2
– Continued on next page –
* Dolby noise reduction manufactured
under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”andthe double-Dsymbola
are trademarks of Dolby Laboratories
Licensing Corporation.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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– 2 –
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINE
WITH MARK !ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL
OR IN SUPPLEMENTS PUBLISHED BY SONY.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.
MODEL IDENTIFICATION
– BACK PANEL –
PART No.
MODEL PART NO.
Malaysia 4-991-746-3π
Saudi Arabia, Thai 4-991-746-8π
Singapore 4-991-747-0π
Taiwan 4-991-747-1π
Chinese 4-991-747-2π
Indonesia 4-991-747-3π
Hong Kong 4-991-747-5π
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TEL 13942296513 QQ 376315150 892498299
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– 3 –
TABLE OF CONTENTS
1. GENERAL ............................................................... 4
2. DISASSEMBLY ...................................................... 7
3. TEST MODE .......................................................... 16
4. MECHANICAL ADJUSTMENTS .................. 19
5. ELECTRICAL ADJUSTMENTS
DECK Section .............................................................. 19
CD Section.................................................................... 22
VIDEO Section............................................................. 23
6. DIAGRAMS
6-1. IC Pin Function Description ......................................... 24
6-2. Printed Wiring Board —BD Section— ........................ 33
6-3. Schematic Diagram —BD Section— ........................... 35
6-4. Printed Wiring Boards —CD MOTOR Section— ....... 37
6-5. Schematic Diagram —CD MOTOR Section—............ 39
6-6. Printed Wiring Boards —VIDEO Section—................ 42
6-7. Schematic Diagram —VIDEO Section— .................... 45
6-8. Schematic Diagram —DECK Section—...................... 51
6-9. Printed Wiring Boards —DECK Section— ................. 55
6-10. Printed Wiring Boards
—MAIN/DECK/POWER SUPPLY Section— ............ 58
6-11. Schematic Diagram
—MAIN/POWER SUPPLY Section— ........................ 61
6-12. Schematic Diagram —PANEL Section— .................... 66
6-13. Printed Wiring Boards —PANEL Section—................ 71
6-14. Printed Wiring Boards
—POWER AMP/KEY CONTROL Section—............. 75
6-15. Schematic Diagram
—POWER AMP/KEY CONTROL Section—............. 76
7. EXPLODED VIEWS ............................................ 90
8. ELECTRICAL PARTS LIST ............................. 101
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 ˚C during
repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering or
unsoldering.
SERVICING NOTES
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TEL 13942296513 QQ 376315150 892498299
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– 4 –
SECTION 1
GENERAL
1POWER button
2DISC SKIP EX-CHANGE button
30button
4)button
5DISC 1 button
6DISC 2 button
7DISC 3 button
8pbutton
9§OPEN/CLOSE button
0·∏button
!¡ CD disc tray
!™ FUNCTION button
!£ STEREO/MONO button
!¢ TUNING MODE button
!∞ TUNER MEMORY button
!§ TUNER/BAND button and indicator
!¶ VOLUME control knob
!• LEVEL + button
!ª LEVEL – button
@º BEAT SELECT button
@¡ BEAT SPEED button
@™ BEAT ON/OFF button and indicator
@£ DJ MIX LOOP button
@¢ DJ MIX FLASH button
@∞ PHONES jack
@§ MIX MIC jack
@¶ MIC LEVEL control knob
@• ECHO LEVEL control knob
@ª WAVE button
#º NON-STOP button and indicator
#¡ BPM CONTROL button and indicator
#™ GROOVE button and indicator
#£ SONIC FORMATION button and indicator
#¢ MEMORY button
#∞ VCD indicator
#§ PBC indicator
#¶ AUTO PBC indicator
#• LOW FREQUENCY button
#ª Fluorescent indicator tube
$º HIGH FREQUENCY button
$¡ KARAOKE PON/MPX button
$™ EFFECT ON/OFF button and indicator
$£ MUSIC button
$¢ MOVIE button
$∞ GAME button
$§ P FILE button
$¶ TIMER SELECT button
$• CLOCK/TIMER SET button
$ª SLEEP button
%º DISPLAY/DEMO button
%¡ DIRECTION button
%™ 1/ALL DISCS button
%£ PLAY MODE button
%¢ ENTER/NEXT button and indicator
12345 6 7 890
LOCATION OF CONTROLS
— Front Panel —
•
•• ••••
••
!•
!ª
@º
@¡
@™
@£
@¢
@∞
@§
@¶
@•
•••••
•
•••
•
!¡
!™
!£
!¢
!∞
!§
!¶
•
•
••
•
•
•
@ª#º #¡ #™ #£#¢
•
•
•
•
•
#∞#§#¶ #• #ª $º
$¡
$™
$£
$¢
$∞
$§
•
••
••
•
•
•
•
•
•••
•
•
•••••
$¶
$•
$ª
%º
%¡
%™
%£
%¢
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TEL 13942296513 QQ 376315150 892498299
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– 5 –
%∞ PREV button
%§ NEXT button
%¶ RETURN button
%• SELECT button
%ª Jog dial knob and indicator
^º 0button (deck B side)
^¡ )button (deck B side)
^™ ·button and indicator (deck B side)
^£ ªbutton and indicator (deck B side)
^¢ pbutton (deck B side)
^∞ DJ MIX A PAD button
^§ DJ MIX PAD B button
^¶ DJ MIX CHAIN button
^• 0button (deck A side)
^ª ªbutton and indicator (deck A side)
&º ·button and indicator (deck A side)
&¡ pbutton (deck A side)
&™ )button (deck A side)
&£ §button (deckA side)
&¢ Cassette holder (deck A side)
&∞ HIGH SPEED DUBBING button
&§ CD SYNCHRO button
&¶ rREC button and indicator
&• PPAUSE button and indicator
&ª Cassette holder (deck B side)
*º §button (deck B side)
1FM ANTENNA terminal
2AM ANTENNA terminal
3SYSTEM SELECT switch (NTSC/AUTO/
PAL select)
4VOLTAGE SELECTOR (except Saudi
Arabia, Malaysia, Thai models)
5CD DIGITAL OUT OPTICAL
6VIDEO/MD (AUDIO) IN pin jack
7VIDEO/MD (AUDIO) OUT pin jack
8SUPER WOOFER output pin jack
9SURROUND SPEAKER output terminal
0SPEAKER output terminal
!¡ VIDEO OUT pin jack
!™ S VIDEO OUT connector
%∞%§%¶%•
•••
^∞
^§
^¶
^•
&º
&¡
&™
••
•
•
•
•
••
•
•
%ª
^º
^¡
^™
^£
^¢
•
••••
•
&¢ &∞&§ &¶ &• *º
•
•
•
•
•
^ª
&£
•
&ª
•
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3
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9
0
••
•
!¡ !™
•
— Rear Panel —
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TEL 13942296513 QQ 376315150 892498299
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– 7 –
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
OPTICAL PICK-UP
CLEANING
(Page 8)
BASE UNIT
(BU-5BD21AL)
(Page 9)
BD BOARD
(Page 10)
OPTICAL PICK-UP
(KSS-213D/Q-NP)
(Page 10)
SLED MOTOR
(M102)
SPINDLE MOTOR
(M101)
(Page 10)
TRAY SECTION
(Page 11) MAIN BOARD
(Page 15)
CASE
(Page 8)
CAPSTAN
MOTOR (M1)
(Page 13)
SLIDER (HEAD)
ASS’Y
(Page 14)
BELT
(Page 14) MAGNETIC
HEAD
(Page 15)
TAPE MECHANISM DECK SECTION
(TCM-220WR2)
(Page 12)
FRONT PANEL SECTION
(Page 12)
CD MECHANISM DECK SECTION
(CDM38L-5BD21AL)
(Page 9)
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TEL 13942296513 QQ 376315150 892498299
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– 8 –
Note: Follow the disassembly procedure in the numerical order given.
CASE
3
three screws
(BVTT 3
×
8)
4
Remove the case to
direction of the arrow.
2
screw
(case 3 TP2)
(3
×
10)
1
two screws
(case 3 TP2)
(3
×
8)
2
screw (case 3TP2)
(3
×
10)
1
two screws
(case 3 TP2)
(3
×
8)
OPTICAL PICK-UP CLEANING
1
In sled servo mode (see page
16), slide the optical pick-up a
little in arrow direction.
2
Insert an applicator into a hole
of the chucking arm and clean
the lens.
hole
Note 1: In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of
excessive force could damage the lens holder.
Note 2: In cleaning, do not use a cleaner other than exclusive
cleaning liquid (KK-91 or isopropyl alcohol).
Note 3: Wipe the objective lens spirally from center toward
outside.(See Figure A)
(Figure A)
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TEL 13942296513 QQ 376315150 892498299
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– 9 –
CD MECHANISM DECK SECTION (CDM38L-5BD21AL)
1
Turn the cam to direction
of the arrow
A
.
2
Pull the tray.
3
loading panel
4
Push the tray.
5
two connectors
(CN203, 204)
6
screw
(BVTP 3
×
10)
7
screw
(BVTP 3
×
8)
8
Removal the CD mechanism deck section
(CDM38L-5BD21AL)todirectionofthear-
row
B
.
9
flat wire (29 core)
(CN101)
A
B
BASE UNIT (BU-5BD21AL)
2
boss
1
two yoke brackets
7
two screws
(BVTP 3
×
8)
7
screw
(BVTP 3
×
8)
6
screw
(BVTP 3
×
10)
3
base unit
(BU-5BD21AL)
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TEL 13942296513 QQ 376315150 892498299
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– 10 –
BD BOARD
4
flat wire (16 core)
(CN102)
5
screw
(BVTP 2.6
×
8)
6
Removal
the four solders.
7
BD board
1
two screws
(PTPWH M2.6
×
6)
1
two screws
(PTPWH M2.6
×
6)
2
optical pick-up
section
3
two springs
limit switch
(S101)
OPTICAL PICK-UP (KSS-213D/Q-NP), SLED MOTOR (M102), SPINDLE MOTOR (M101)
1
claw
2
sled shaft
3
optical pick-up (KSS-213D/Q-NP)
3
two springs
4
two screws
(P 2
×
3)
5
sled motor
(M102)
6
spindle motor
(M101)
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TEL 13942296513 QQ 376315150 892498299
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– 11 –
TRAY SECTION
1
Turn the cam to direction
of the arrow.
Note: When installing the tray, pull around the flat wire
to pass through the claw Aand claw B, as
shown in the figure.
flat wire
3
flat wire (8 core)
(CN702)
claw
B
claw
A
2
Pull the tray.
5
Removal the tray.
4
two claws
Note: When installing the tray, take care so that the collars Aand B
are properly inserted into the slots.
collar
A
collar
B
slots
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TEL 13942296513 QQ 376315150 892498299
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– 12 –
FRONT PANEL SECTION
3
loading panel
5
screw
(BVTP 3
×
10)
6
five screws
(BVTT 3
×
6)
7
two claws
8
front panel section
2
Pull the tray
1
Turn the cam to
direction of the
arrow
A
.
A
5
screw
(BVTP 3
×
10)
TAPE MECHANISM DECK SECTION (TCM-220WR2)
2
Open the
cassette lids.
3
three screws
(BVTP 2.6
×
8)
4
tape mechanism deck
section
(TCM-220WR2)
1
Push the two buttons.
4
flat wire (21 core)
(CN205)
4
flat wire (17 core)
(CN102)
4
flat wire (11 core)
(CN206)
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TEL 13942296513 QQ 376315150 892498299
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– 13 –
CAPSTAN MOTOR (M1)
1
connector
(CN651)
2
four screws
(BTP 2.6
×
4)
A
3
Removal the AUDIO board
to direction of the arrow
A
.
4
Break the soldering
of motor lead.
5
two screws
(BTP 2.6
×
8)
6
claw
8
Hang the two belts.
7
Removal the capstan motor (M1)
to direction of the arrow
B
.
B
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TEL 13942296513 QQ 376315150 892498299
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– 14 –
BELT
1
belt (FR)
2
belt A
3
belt B
4
belt (FR)
capstan motor
SLIDER (HEAD) ASS’Y
1
claw
2
pinch lever (REV) ass’y
3
tension spring
4
two clips
1
claw
A
2
pinch lever (FWD) ass’y
5
Break the soldering of
flexible flat cables.
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TEL 13942296513 QQ 376315150 892498299
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– 15 –
1
connector
(CN901)
3
two screws
(BVTP 3
×
8)
4
connector
(CN101)
IC201
2
flat wire (15 core)
(CN201)
1
two connectors
(CN105, 106)
MAIN BOARD
3
four screws
(BVTP 3
×
8)
5
MAIN board
MAGNETIC HEAD
1
tension spring (1)
2
Removal the slider (REV slider)
to direction of the arrow.
3
two screws
(P 2
×
6)
4
magnetic head
5
two azimuth adjustment screws
6
azimuth adjustment spring
2
flat wire (13 core)
(CN202)
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TEL 13942296513 QQ 376315150 892498299
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– 16 –
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. Pressthree buttons NEXT , ENTER/NEXT ,and DISC1 si-
multaneously.
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 DIRECTION 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 NEXT , ENTER/NEXT ,and DISC2 si-
multaneously.
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 NEXT , ENTER/NEXT , and
FUNCTION 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
movethepick-up tooutsidetrack, or 0buttonto insidetrack.
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 FUNCTION NAME
• The FUNCTION name of external input terminal can be changed
over to “VIDEO” or “MD”.
Procedure:
1. Press POWER button to turn the set OFF.
2. Press POWER button together with FUNCTION button, and
the power is turned on, the display of fluorescent indicator tube
changes to “MD” or “VIDEO” instantaneously, and thus the
FUNCTION is changed over.
It is set to “VIDEO” at shipment.
SECTION 3
TEST MODE
CHANGE-OVER OF AM TUNER STEP BETWEEN 9 kHz
AND 10 kHz
• A step ofAM 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 “MW”.
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 “MW
9 k STEP” or “MW 10 k STEP”, and thus the channel step is
changed over.
Be sure not to change with carelessness.
LED AND FLUORESCENT INDICATORTUBE ALL LIT, KEY
CHECK MODE
Procedure:
1. Press three buttons NEXT , ENTER/NEXT ,and DISC3 si-
multaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press DISC 2 button, and the key check mode is activated.
3. In the key check mode, the fluorescent indicator tube displays
“K 1 J0V0”. 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.
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)
[VIDEO BOARD] (SIDE-A)
IC701 IC201
D701
IC771 IC901
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TEL 13942296513 QQ 376315150 892498299
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– 17 –
7. In the aging mode, the aging is executed in a sequence given
in “2-2. Operation duringAging 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 DISC1 and DISC2 trays.
2. Select the function “CD”.
3. Press three buttons NEXT , ENTER/NEXT ,
and KARAOKE PON/MPX 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 Sec-
tion”.
1-2. Operation during aging Mode
In the aging mode, the program is executed in the following se-
quence.
1. The disc table is ejected.
2. The disc tray turns to select a disc. (For a disc selection
sequence, see Section 1-3.)
3. TOC of disc is read.
4. The pick-up accesses to the last track.
5. A disc is ejected.
6. Steps 2 through 5 are repeated.
1-3. Disc Selection Sequence
• During the aging mode, discs are selected in the following se-
quence:Disc 1 →Disc 2
↑↓
Disc 2 ←Disc 1
2. Aging Mode in Tape Deck Section
2-1. Operating Method of Aging Mode
1. Load acommerciallyavailable 10-minute tape intothe 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 0button respec-
tively on decks A and B.
4. Press three buttons NEXT , ENTER/NEXT ,
and KARAOKE PON/MPX simultaneously.
5. Press ·button on deckA. (This button triggers the ag-
ing mode.)
6. The aging mode is activated if “AGINGA” is displayed on
the fluorescent indicator tube.
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TEL 13942296513 QQ 376315150 892498299
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– 18 –
VIDEO CD COLOR BAR MODE
On this mode, the data of the color bar signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC701) for the video CD signal check.
When measurement of the voltage and waveform on the VIDEO
board, perform it in this mode.
For reference, the color bar signal can be observed at J9001
(VIDEO OUT) and the sound signal can be observed at J101
(VIDEO/MD (AUDIO) OUT) using an oscilloscope.
Procedure:
1. Turned power switch on.
2. Press the FUNCTION button to select the CD.
3. Connect the SL701 on the VIDEO board with solder.
4. After measuring, remove the soldering installed.
+
–
oscilloscope
75
Ω
set
J9001 (VIDEO OUT)
B
H
C
A
A = 0.9 to 1.1 Vp-p
B = 0.678 to 0.75 Vp-p
C = 0.214 to 0.328 Vp-p
Fig. 1 Video CD Color Bar Signal Output from J9001
(VIDEO OUT)
[VIDEO BOARD] (SIDE-B)
E-F BALANCE MODE
Refer to the SECTION 6 ELECTRICAL ADJUSTMENTS page
22.
Procedure:
1. Turned power switch on.
2. Press the FUNCTION button to select the CD.
3. Connect the SL701 and SL703 on the VIDEO board with sol-
der.
4. Press the ·∏button in playback.
5. Every pressing the REPEAT button on the remote commander,
the tracking servo and sledding servo are turned on or off.
6. When the servo is off, the counter on front panel will not be
changed.
7. After measuring, remove the soldering installed.
SL702
SL701 IC751
SL703
IC251
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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– 19 –
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
•Torque Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C 36 to 61g•cm
(0.50 – 0.84 oz•inch)
Forward CQ-102C 2 to 6g•cm
Back Tension (0.026 – 0.082 oz•inch)
Reverse CQ-102RC 36 to 61g•cm
(0.50 – 0.84 oz•inch)
Reverse CQ-102RC 2 to 6g•cm
Back Tension (0.026 – 0.082 oz•inch)
FF, REW CQ-201B 61 to 143g•cm
(0.85 – 1.98 oz•inch)
Mode Tension Meter Meter Reading
Forward CQ-403A more than 100 g (3.53 oz)
Reverse CQ-403R more than 100 g (3.53 oz)
DECK SECTION 0 dB=0.775 V
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks.
Procedure:
1. Mode: Playback (FWD)
set
MAIN board
CN207
pin
3
(L-CH)
pin
1
(R-CH)
MAIN board
CN207
pin
2
(GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
•TapeTension Measurement
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjust-
ment should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-ch.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to test mode. (Press key switch same time
NEXT ENTER/NEXT and EFFECT ON/OFF buttons.)
• TestTape
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TEL 13942296513 QQ 376315150 892498299
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– 20 –
reverse
forward
Screw
position
L-CH
peak
within
1 dB
output
level
L-CH
peak R-CH
peak
within
1 dB
Screw
position
R-CH
peak
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN207 (pin
3
: L-CH)
(pin
1
: R-CH)
level meter
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
3. Mode: Playback (FWD)
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback Head (Deck B)
Tape Speed Adjustment DECK A
Note: Start the Tape Speed adjustment as below after setting to
the test mode.
In the test mode, the tape speed is high during pressing the
HIGH SPEED DUBBING button.
Procedure:
1. Turn the power switch on.
2. Press the NEXT button, ENTER/NEXT button and
EFFECT ON/OFF button simultaneously.
To exit from the test mode, press the POWER button.
Mode: Playback (FWD)
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN207 PB level: 301.5 to 338.3 mV (– 8.2 to – 7.2 dB) level
difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board (See page 21)
1. Insert the WS-48B into the deck A and the blank tape into the
deck B.
2. Press the rREC button and ·button on the deck B. Then
the deck B is at recording mode.
3. Set the deck A to playback mode.
4. Keep pressing the HIGH SPEED DUBBING button in play-
back mode.
Then at HIGH speed mode.
5. Adjust RV652 on the AUDIO board so that frequency counter
reads 6,000 ± 90 Hz.
6. Take off the HIGH SPEED DUBBING button.
Then at NORMAL speed mode.
7. Adjust RV651 on the AUDIO board so that frequency counter
reads 3,000 ± 90 Hz.
8. Frequency difference between deck A and deck B the begin-
ning of the tape should be within ± 1.5 %.
Adjustment Location: AUDIO board (See page 21)
Sample Value of Wow and Flutter: 0.3% or less W.RMS
(WS-48B)
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback (FWD)
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin
1
(R-CH)
oscilloscope
VH
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good wrong
pin
2
(GND)
pin
3
(L-CH)
MAIN board
CN207
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
CN207 (pin
3
: L-CH)
(
pin
1
:R-CH
)
frequency counter
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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Table of contents
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