Sony HCD-V4800 User manual

MINI Hi-Fi COMPONENT SYSTEM
MICROFILM
E Model
ChineseModel
SPECIFICATIONS
SERVICE MANUAL
HCD-V4800
HCD-4800isthetuner,deck,VideoCDand
amplifier section in LBT-V4800/V4800R.
CD
Section
Tape deck
Section
Model Name Using Similar Mechanism HCD-V3500
CD Mechanism Type CDM37L-5BD21AL
Base Unit Name BU-5BD21AL
Optical Pick-up Name KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-V808
Tape Transport Mechanism Type TCM-220WR2
* Dolbynoisereductionmanufacturedunder
license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol a
are trademarks of Dolby Laboratories
Licensing Corporation.
– Continued on next page –

– 2 –
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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 –
MODEL PARTNO.
Singapore 4-992-219-0π
Malaysia,Thai 4-992-219-1π
Chinese 4-992-219-2π
Indonesia 4-992-219-3π
PART No.

– 3 –
TABLE OF CONTENTS
1. GENERAL .................................................................. 4
2. DISASSEMBLY ......................................................... 7
3. TEST MODE ............................................................. 15
4. MECHANICAL ADJUSTMENTS ...................... 18
5. ELECTRICAL ADJUSTMENTS
DECK Section ................................................................. 18
CD Section....................................................................... 21
VIDEO Section................................................................ 22
6. DIAGRAMS
6-1. IC Pin Function Description ............................................ 23
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— ....................... 68
6-13. Printed Wiring Boards —PANEL Section—................... 71
6-14. Schematic Diagram
—POWER AMP/KEY CONTROL Section— ................ 74
6-15. Printed Wiring Boards
—POWER AMP/KEY CONTROL Section— ................ 77
7. EXPLODED VIEWS ............................................... 88
8. ELECTRICAL PARTS LIST ................................ 97
SERVICING NOTES
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

– 4 –
1POWER button
2SPECTRUMANALYZER button
3DISPLAY/DEMO button
4Remote control receiver
5Fluorescent indicator tube
6EFFECT button and indicator
7ENTER/NEXT button and indicator
8TUNER MEMORY button
9TUNING MODE button
0TUNING – button
!¡ TUNER/BAND button and indicator
!™ TUNING + button
!£ STEREO/MONO button
!¢ FUNCTION button
!∞ VOLUME control knob
!§ SUPER WOOFER button and indicator
!¶ SUPER W MODE button
!• pbutton (deck B side)
!ª )button (deck B side)
@º 0button (deck B side)
@¡ §EJECT button (deck B side)
@™ 6OPEN button
@£ t/CLOCK SET button
@¢ SLEEP button
@∞ REC button
@§ )button (deck A side)
@¶ pbutton (deck A side)
@• 0button (deck A side)
@ª §EJECT button (deck A side)
#º DIRECT PLAY DISC 1 to DISC 5 buttons
#¡ ˆRETURN button
#™ PREV button
#£ NEXT button
#¢ Cassette holder (deck A side)
#∞ CD disc tray
#§ Cassette holder (deck B side)
#¶ 0button
#• ≠AMS ±jog dial knob
#ª )button
SECTION 1
GENERAL
LOCATION OF CONTROLS
— Front Panel —
0!¡
9
8
7
65
4321
!™
!£
!¢
!∞
!§
!¶
!•
!ª
@º
@¡
@™
@£
@¢
@∞
@§
@¶
@•
@ª
#º
#¡ #™ #£ #¢ #∞ #§ #¶ #• #ª

– 5 –
$º SOUND CONTROL WAVE button
$¡ SOUND CONTROL SURROUND button
$™ P FILE MEMORY button
$£ GEQ CONTROL button
$¢ GROOVE button and indicator
$∞ GEQ cursor control
$§ ENTER button and indicator
$¶ KEY CONTROL nbutton
$• ·button and indicator
$ª pbutton
%º REPEAT button
%¡ MIC LEVEL control knob
%™ ECHO LEVEL control knob
%£ KARAOKE PON/MPX button
%¢ KEY CONTROL ˜button
%∞ CD NON-STOP button and indicator
%§ DJ MIX CD LOOP button
%¶ DJ MIX CD FLASH button
%• KEY CONTROL indicator
%ª DISC SKIP button
^º EDIT button
^¡ Pbutton and indicator
^™ FILE 1/MOVIE/ROCK indicator
^£ FILE 2/GAME/POP indicator
^¢ FILE 3/NIGHT/JAZZ indicator
^∞ FILE 4/PARTY/DANCE indicator
^§ FILE 5/RELAX/SALSA indicator
^¶ P FILE/MENU 2/MENU 1 indicator
^• ªbutton and indicator (deck B side)
^ª ·button and indicator (deck B side)
&º rREC button and indicator
&¡ CD SYNC button
&™ H SPEED DUB button
&£ PLAY MODE button
&¢ 1/ALL DISCS button
&∞ DAILY 1 button
&§ DAILY 2 button
&¶ MIC 1 jack
&• MIC 2 jack
&ª PHONES jack
*º ·button and indicator (deck A side)
*¡ ªbutton and indicator (deck A side)
*™ DIRECTION button
*£ DOLBY NR button
*¢ VCD indicator
*∞ PBC indicator
*§ AUTO PBC indicator
*¶ PPAUSE button and indicator
$º $¡ $™ $£
$¢
$∞
$§
$¶
$•
$ª
%º
^¡^º%ª
%•
%¶%§
%∞
%¢
%£
%™
%¡
^™ ^£ ^¢ ^∞ ^§ ^¶
^•
^ª
&º
&¡
&™
&£
&¢
*¶
*§
*∞
*¢
*£
*™
*¡
*º
&ª
&•
&¶
&§
&∞

– 6 –
1FM ANTENNA terminal
2AM ANTENNA terminal
3VOLTAGE SELECTOR (except Malaysia, Thai models)
4PHONO IN pin jack
5VIDEO (AUDIO) IN pin jack
6VIDEO (AUDIO) OUT pin jack
7SPEAKER output terminal
8VIDEO OUT pin jack
9S VIDEO OUT connector
0SYSTEM SELECT switch (NTSC/AUTO/PAL select)
— Rear Panel —
12
3
4
5
6
7
8
90

– 7 –
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
CASE
MAIN BOARD
(Page 8)
CD LID ASS’Y
SECTION
(Page 11)
TAPE MECHANISM
DECK SECTION
(TCM-220WR2)
(Page 10)
MAIN
SECTION
(Page 9)
CASSETTE
LID ASS’Y
(Page 10)
CD MECHANISM
DECK SECTION
(CDM37L-5BD21AL)
(Page 9) DISC TABLE
(Page 12)
BASE UNIT
(BU-5BD21AL)
(Page 12)
BD BOARD
(Page 13)
PANEL (A)/(B)
SUB ASS’Y
(Page 11)
CAPSTAN MOTOR (M1)
(Page 14)
OPTICAL
PICK-UP
(KSS-213D/Q-NP)
(Page 13)
SLED
MOTOR (M102),
SPINDLE
MOTOR (M101)
(Page 13)
FRONT PANEL
SECTION
(Page 8)
CASE
(Page 7)
• This set can be disassembled in the order shown below.
3
case
1 screw
(case 3 TP2)
1 two screws
(case 3 point
)
2 seven screws
(BVTT 3
× 6)
1 two screws
(case 3 point)
1 screw
(case 3 TP2)

– 8 –
FRONT PANEL SECTION
MAIN BOARD
1 flat wire (21 core)
(CN205)
3 front panel section
2 four screws
(BVTP 3 × 8)
1 flat wire (11 core)
(CN206)
1 flat wire (17 core)
(CN102)
5 connector
(CN901)
3 power cord
4 back panel
2 fourteen screws
(BVTP 3
× 8)
1 flat wire (13 core
)
(CN1)
8 MAIN board
IC201
7 connector
(CN101)
6 two screws
(BVTP 3
× 8)
5 connector
(CN203)
1 connector
(CN106)
5 flat wire (13 core)
(CN202)
power
transformer
• Installing the power cord for
the chinese model.
power cord
ferrite core
wire clamp

– 9 –
1 flat wire (13 core)
(CN202)
4 main section
3 eight screws
(BVTP 3
× 8)
3 two screws
(BVTP 3
× 8)
2 connector
(CN203)
3 two screws
(BVTP 3
× 8)
4 flat wire (29 core)
(CN101)
1 Open the clamp.
2 five screws
(BVTP 3
× 8)
3 CD mechanism
deck section
(CDM37A-5BD21AL)
MAIN SECTION
CD MECHANISM DECK SECTION (CDM37L-5BD21AL)

– 10 –
TAPE MECHANSM DECK SECTION (TCM-220WR2)
4 three screws
(BVTP 2.6
× 8)
3 flat wire (21 core)
(CN601)
3 flat wore (11 core)
(CN1001)
4 three screws
(BVTP 2.6
× 8)
5 Remove the tape mechanism
deck section (TCM-220WR2)
to derection of the arrow
A .
2 Open the
cassette lids.
1 Push the
two buttons.
A
CASSETTE LID ASS’Y
1 two springs
4 cassette lid ass’y
2 two screws
(BVTP 2.6
× 8
)
3 two brackets

– 11 –
5 connector
(CN671)
6 four screws
(BVTP 2.6
× 8)
7 CD lid ass’y
4 connector
(CN661)
2 four screws
(BVTP 2.6
× 8
)
3 CD-B1 SW board
1 connector
(CN642)
1 connector
(CN612)
5 two claws
6 panel (B) sub ass’y
5 two claws
4 panel (A) sub ass’y
3 two claws
3 two claws
2 four screws
(BVTP 2.6
× 8)
CD LID ASS’Y SECTION
PANEL (A) / (B) SUB ASS’Y

– 12 –
3 base unit
(BU-5BD21AL)
1 yoke bracket
2 boss
1 screw
(BVTP 3
× 8)
1 screw
(BVTP 3
× 8)
3 step screw
4 disc tabl
e
A
A
2
bracket (BU)
BASE UNIT (BU-5BD21AL)
DISC TABLE
Note:
When the disc table is installed, adjust the positions
of roller cam amd mark (as shown in the figure, then
setto the groove of disctable.

– 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)
BD BOARD
OPTICAL PICK-UP (KSS-213D/Q-NP), SLED MOTOR (M102), SPINDLE MOTOR (M101)
3 optical pick-up (KSS-213D/Q-NP)
6 spindle motor
(M101)
2 sled shaft
1 claw
5 sled motor
(M102)
4 two screw
s
(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
CAPSTAN MOTOR (M1)

– 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
movethe pick-up to outside track,or 0button to 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.
SECTION 3
TEST MODE
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.
[VIDEO BOARD] (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 executeaging 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 acommercially available 10-minutetape 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 0button 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 “AGINGA” is displayed on
the fluorescent indicator tube.

– 17 –
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 (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
21.
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, 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

– 18 –
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 otherwise
specified.
8. Set to test mode. (Press key switch same time
GROOVE ENTER/NEXT and DISC 4 buttons.)
To exit from the test mode, press the POWER button.
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 performedwith 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 SpeedAdjustment
P-4-L300 315 Hz, 0 dB LevelAdjustment
Record/Playback Head Azimuth Adjustment
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)
•Tape Tension Measurement
• Test Tape
DECK A DECK B
Note: Perform this adjustments for both decks.
Procedure:
1. Mode: Playback (FWD)
Screw
position
L-CH
peak
within
1 dB
output
level
L-CH
peak R-CH
peak
within
1 dB
Screw
position
R-CH
peak
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.

– 19 –
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 H SPEED DUB button in playback mode.
Then at high speed mode.
5. Adjust RV652 on theAUDIO board so that frequency counter
reads 6,000 ± 90 Hz.
6. Take off the H SPEED DUB button.
Then at normal speed mode.
7. Adjust RV651 on theAUDIO 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 20)
Sample Value of Wow and Flutter: 0.3% or less W.RMS
(WS-48B)
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
H SPEED DUB button.
Procedure:
1. Turn the power switch on.
2. Press the GROOVE button, ENTER/NEXT button and
DISC 4 button simultaneously.
To exit from the test mode, press the POWER button.
Mode: Playback (FWD)
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN207 (pin
3 : L-CH)
(pin
1 : R-CH)
level meter
3. Mode: Playback (FWD)
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback Head (Deck B)
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 20)
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
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback (FWD)
revers
e
forward

– 20 –
+
–
set
recorded
portion
MAIN board
CN207 (pin
3 : L-CH)
(pin
1 : R-CH)
level meter
attenuator
set
pin 6 (L-CH) of IC1501 on the MAIN board.
pin
#¶ (R-CH) of IC1501 on the MAIN board.
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



pin 2 (GND) of CN207 on the MAIN board.
600
Ω
blank tape
CS-123
AF OSC
RV1501
IC1501 CN205
CN207
RV1551
RECORD LEVEL
IC301
IC201
121 1
22 42
3
Record bias Current Adjustment DECK B
Procedure:
1. Mode: Record
2. Mode: Playback
+
–
set
recorded
portion
MAIN board
CN207 (pin
3 : L-CH)
(pin
1 : R-CH)
level meter
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1
and 2.
Adjustable limits: Playback output of 315 Hz to playback out-
put of 10 kHz: ±0.5 dB
Adjustment Location: AUDIO board
Record Level Adjustment DECK B
Procedure:
1. Mode: Record
2. Mode: Playback
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV1501 (L-
CH) and RV1551 (R-CH) on the MAIN board to repeat steps 1
and 2.
Adjustable limits:
CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (ComponentSide)
Adjustment and Connection Location:
[AUDIO BOARD] (ConductorSide)
RECORD
BAIS TAPE SPEED
(NORMAL)
RV651
®
(HIGH)
RV652
®
RV311
L
®
RV411
R
®
PB
LEVEL
RV441RV341
RV301
® L
RV401
® R
RL
– DECK B –
– DECK A –
    
PB LEVEL
    





          
set
pin 6 (L-CH) of IC1501 on the MAIN board.
pin
#¶ (R-CH) of IC1501 on the MAIN board.
315 Hz, 50 mV (–23.8 dB) blank tape
CS-123
pin
2 (GND) of CN207 on the MAIN board.
600
Ω
attenuator
AF OSC