Sony HCD-VX33 User manual

HCD-VX33
E Model
Tourist Model
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
— Continued on next page —
SPECIFICATIONS
• HCD-VX33 is the tuner, deck, CD
and amplifier section in MHC-
VX33.
Model Name Using Similar Mechanism NEW
CD CD Mechanism Type CDM58-K2BD37A
Section Base Unit Name BU-K2BD37A
Optical Pick-up Name KSM-213DAP
Tape deck Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type TCM-230AWR11
Amplifier section
MHC-VX33:
The following measured at AC 120, 220, 240 V
50/60 Hz
DIN power output (rated) 75 + 75 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
100 + 100 watts
(6 ohms at 1 kHz,
10% THD)
Inputs
MD/VIDEO IN: voltage 450/250 mV,
(phono jacks) impedance 47 kilohms
MIC: sensitivity 1 mV,
(mini jack) impedance 10 kilohms
Outputs
VIDEO OUT: max. output level
(phono jack) 1Vp-p, unbalanced,Sync
negative, load impedance
75 ohms
S-VIDEO OUT: Y: 1Vp-p, unbalanced,
(4-pin/mini-DIN jack) Sync negative,
C: 0.286Vp-p,
load impedance 75 ohms
PHONES: accepts headphones of
(stereo mini jack) 8 ohms or more
SPEAKER:
MHC-VX33: accepts impedance of 6 to
16 ohms
VIDEO CD/CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Laser output Max. 44.6
µ W*
*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture.
Wavelength 780 — 790 nm
Frequency response 2 Hz — 20 kHz (±0.5 dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Video color system formatNTSC, PAL
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 660 nm
Output Level —18 dBm

2
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON 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.
1. Check thearea ofyourrepair forunsoldered or poorly-soldered
connections. Checkthe entire boardsurface forsolder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
4. Look for parts which, through functioning,showobvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety
checks before releasing the set to the customer.
5. Check the B+ voltage to see it is at the values specified.
6. 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.
General
Power requirements
Thai model: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or
230 —240 V AC, 50/60 H
z
Adjustable with voltage
selector
Power consumption 190 watts
Dimensions (w/h/d)
Approx. 280 x 325 x 403 mm
Mass Approx. 8.9 kg
Supplied accessories: AM loop antenna (1)
FM lead antenna (1)
Remote Commander (1)
Batteries (2)
Video cable (1)
Front speaker pads (8)
Design and specifications are subject to change
without notice.
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 40 —13,000 Hz (±3 dB),
using Sony TYPE I
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Tourist model: 76.0 —108.0 MHz
Other models: 87.5 —108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Middle Eastern model: 531 —1,602 kHz
(with the interval set at
9 kHz)
Other models: 531 —1,602 kHz
(with the interval set at
9 kHz)
530 —1,710 kHz
(with the interval set at
10 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

3
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.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan thosespecified hereinmay resultin hazardous radiation
exposure.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of 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
The laser diode in the optical pick-up block may suffer electrostatic
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 emission,
observe from more than 30 cm away from the objective lens.
TABLE OF CONTENTS
1. SERVICE NOTE ······························································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBY ·································································· 7
4. TEST MODE···································································· 12
5. MECHANICAL ADJUSTMENTS ····························· 16
6. ELECTRICAL ADJUSTMENTS ······························· 16
7. DIAGRAMS
7-1. Circuit Board Location ················································· 23
7-2. Block Diagrams ···························································· 25
7-3. Printed Wiring Board BD Section ····························· 28
7-4. Schematic Diagram BD Section ································ 29
7-5. Printed Wiring Board Main Section ·························· 30
7-6. Schematic Diagram Main Section (1/3) ···················· 31
7-7. Schematic Diagram Main Section (2/3) ···················· 32
7-8. Schematic Diagram Main Section (3/3) ···················· 33
7-9. Printed Wiring Board PowerAMP Section ··············· 34
7-10. Schematic Diagram Power AMP Section ················ 35
7-11. Printed Wiring Board Panel Section ························ 36
7-12. Schematic Diagram Panel Section ··························· 37
7-13. Printed Wiring Board Leaf SW Section ··················· 38
7-14. Schematic Diagram Leaf SW Section ····················· 39
7-15. Printed Wiring Board Driver Section ······················· 40
7-16. Schematic Diagram Driver Section ························· 41
7-17. Printed Wiring Board Video CD Section ················· 42
7-18. Schematic Diagram Video CD Section (1/2) ··········· 43
7-19. Schematic Diagram Video CD Section (2/2) ··········· 44
7-20. Printed Wiring Board Power Section ······················· 45
7-21. Schematic Diagram Power Section·························· 45
7-22. IC Pin Function Description ······································· 46
7-23. IC Block Diagrams ····················································· 50
8. EXPLODED VIEWS
8-1. Main Section································································· 54
8-2. Panel Section ································································ 55
8-3. Main Board Section ······················································ 56
8-4. Tape Mechanism Section (TCM-230PWR11) (1/2) ····· 57
8-5. Tape Mechanism Section (TCM-230PWR11) (2/2) ····· 58
8-6. CD Mechanism Section (CDM58-K2BD37) ··············· 59
9. ELECTRICAL PARTS LIST ······································· 60

4
SECTION 1
SERVICE NOTE
MODEL IDENTIFICATION
—BACK PANEL —
MODEL
E, EA, HK, MY, SP, TW, JE models
TH model
IA model
PARTS No.
4-224-547-3s
4-224-547-5s
4-226-245-4s
PARTS No.
•Abbreviation
EA :Saudi Arabia model
MY :Malaysia model
SP :Singapore model
TH :Thai model
TW :Taiwan model
IA :Indonesia model
HK :Hong Kong model
JE :Tourist model
Screw hole
Attach the panel board with
fourteen screws (
+BVTP 2.6 × 8 )
after the board is removed once.
Do not tighten the screws excessively.
1 Cut the fourteen melted-connection points with a cutting plier.
Note for installing the panel board
2 Panel board
Hot melt

5
SECTION 2
GENERAL
123 45
6
7
8
9
q;
qa
qsqdqfqgqh
qj
ql
qk
w;
wa
ws
wd
wf
wk
wl
e;
ea
es
ed
efeg
eh
ej
wg
wh
wj
1–.button
2xbutton
3gG/SELECT button
4Sbutton
5>+ button
6PLAY MODE button
7REPEAT button
8EDIT button
9VOLUME knob
q; PHONE jack
qa OPEN/CLOSE button
qs DISC 3 button
qd DISC 2 button
qf DISC 1 button
qg DISC SKIP EX-CHANGE button
qh CURSOL button
qj MIC jack
qk ECHO LEVEL knob
ql MIC LEVEL knob
w; SPECTRUM button
wa DISPLAY button
ws @/1button
wd MD/VIDEO button and indicator
wf TAPE A/B button and indicator
wg RETURN button
wh PREV button
wj NEXT button
wk CD button and indicator
wl TUNER/BAND button and indicator
e; GROOVE button and indicator
ea CINEMA SPACE button and indicator
es CD SYNC HI-DUB button
ed REC PAUSE/START button and indicator
ef KARAOKE PON/MPX button
eg ENTER button
eh EQ EDIT button
ej PICTURE EFFECT button

6
This section is extracted from
instruction manual.
8
1Press CLOCK/TIMER SET.
The hour indication flashes.
2Press .or >repeatedly to set
the hour.
3Press ENTER.
The minute indication flashes.
4Press .or >repeatedly to set
the minute.
5Press ENTER.
The clock starts working.
Tip
If you make a mistake, start over from step 1.
To change the time
The previous explanation shows how to set
the time while the power is off. To change the
time while the power is on, do the following:
1Press CLOCK/TIMER SET.
2Press .or >repeatedly to select SET
CLOCK.
3Press ENTER.
4Perform steps 2 through 5 above.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
NX x
xMm>.
nN
O
v
V
bB
X
Step2: Setting the
time
You must set the time before using the timer
functions.
1
3,5
2,4

7
SECTION 3
DISASSEMBY
Note : Follow the disassembly procedure in the numerical order given.
3-1. UPPER CASE (TOP)
3-2. LOADING PANEL ASSY
Case (R)
4
q;
8
Upper case (Top)
Case (L)
5 Two screws (Case)
7 Two screws
(+BVTP 3 × 10)
3 Two screw
s
1 Two screws (Case)
9 Four screws (+BVTP 3 × 10)
6 Screw (Case)
2 Screw (Case)
2 Pull-out the disc tray.
1 Turn the pulley to the direction of arrow.
pulley
Loading panel assy
Front panel side
CD mechanism deck (CDM58)
3

8
3-3. FRONT PANEL SECTION
3-4. TAPE MECHANISM DECK
qa
CD mechanism deck (CDM58)
9 Flat type wire
(CN501)
8 Flat type wire
(CN502)
qd Video Board
q; Two screws
(+BVTP 3
× 10)
qs Two screws
(+BVTP 2.6
× 8)
7
Front panel section
2 Connector (CN1)
3 Connector (CN2)
1 Flat type wire(CN304)
6 Three screws (+BVTT 3 × 6)
5 Screw(+BVTP 3 × 10)
4 Screw (+BVTP 3 × 10)
6 Tape mechanism deck
5 Five screws (+BVTP 2.6 × 8)
1 Screw (+BVTP 2.6 × 8)
2 Bracket (Heart cam R)
4 Bracket (Heart cam L)
3 Screw (+BVTP 2.6 × 8)

9
3-5. PANEL BOARD
3-6. SUB-TRANS BOARD ANDTRANS BOARD
7 Cut the fourteen melted-connection points with a cutting plier.
Note: When attching the panel board,
refer to "Service Note" on page 4.
9 Panel board
1 Knob (Volume)
2 Hexagon nut
3 Bracket (Volume)
6
4 Ring (Vol)
8 Six claws
5 Spring (Jog)
3 Two screws
(+BVTT 4 × 6)
8 Five screws
(+BVTP 3 × 10
)
7 Two screws
(+BVTP 3 × 10)
q; Two screws
(+BVTP 3 × 10)
qs Screw (+BVTP 2.6 × 8)
9 Back panel
4 Two screws
(+BVTT 4 × 6)
6 Trans board
qd Sensor board
qa Cover (Duct)
5 Trans
1 Connector (CN971)
2 Connector (CN972)

10
6 Screw (+PS 2.6 × 5)
4 Screw (+PS 2.6 × 5)
2Leaf SW board
1 Five claws
5 Head (A) board
7 Head (B) board
3 Remove the four solderings.
3-7. MAIN BOARD AND AMP BOARD
3-8. LEAF SW BOARD, HEAD (A) BOARD AND HEAD (B) BOARD
4 Three screws (+BVTP 3 × 8)
6 Two screws (+BVTP 3 × 8)
7 Heat sink
3 Two screws (+BVTP 3 × 16)
1 Two screws (+BVTP 3 × 8
)
2 Main board
5 Power AMP board

11
Base unit
6
5 Four screws (+PTPWH 2.6
)
3 Screw (+BVTT 2.6 × 8)
4 BD board
8 Two insulators
7 Two insulators
1 Flat type wire (CN101)
2 Flat type wire (CN102)
8 Pull-out the disc tray.
5 Three screws (+BVTP 2.6 × 8)
9 Screw (+PTPWH 2.6 × 8)
q; Tray
1 Screw (+BVTP 2.6 × 8)
qa Screw (+BVTP 2.6 × 8)
4 Flat type wire (CN721)
7 Motor board
qs Address sensor board
2 Driver board
3 Connector (CN701)
6 Remove the two solderings of motor.
3-9. BASE UNIT
3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD

12
SECTION 4
TEST MODE
[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 x, ENTER , and ?/1simultaneously.
2. The fluorescent indicator tube displays “COLD RESET”and
the set is reset.
[CD Ship Mode]
•This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1button to turn the set ON.
2. Press three buttons x, ENTER , and SPECTRUM
simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK”is displayed on the fluorescent indicator tube, and the
CD ship 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 x, ENTER , and DISPLAY
simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[CD Service Mode]
•This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x, ENTER , and ZOPEN/CLOSE si-
multaneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the shuttle knob clockwise to
move the pickup to outside track, or turn the shuttle knob
counter-clockwise to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 2.
Note: •Always move the pickup 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.
[VACS ON/OFF Mode]
•This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the ENTER and SPECTRUM buttons simultaneously. The
message “VACS OFF”or “VACS ON”appears.
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
•A step of MW channels can be changed over between 9 kHz
and 10 kHz.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND
button to select the BAND “AM”.
3. Press ?/1button to turn the set OFF.
4. Press ENTER and ?/1buttons simultaneously, andthe display
of fluorescent indicator tube changes to “AM 9 k STEP”or
“AM 10 k STEP”, and thus the channel step is changed over.
[GCTest Mode]
•This mode is used to check the software version, FL tube, LED,
keyboard and VACS.
Procedure:
1. Press threebuttons x, ENTER ,and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,
press DISC 1 . Themodel numberand destination aredisplayed.
4. Each time DISC 1 is pressed, the display changes starting
from MC version, GC version, VC version, CD version, CM
version, ST version, TC version, TA version, TM version and
BR version in this order, and returns to the model number and
destination display.
5. When DISC 3 is pressed while the version numbers are being
displayed except model number and destination, year, month
and day of the software creation appear. When DISC 3 is
pressedagain, the displayreturns to thesoftware version display.
When DISC 1 is pressed while year, month and day of the
software creation are being displayed, the year, month and day
of creation of the software versions are displayed in the same
order of version display.
6. Press DISC 2 button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“KEY0VOL0”. Each time a button is pressed, “KEY”value
increases. However, once a button is pressed, it is no longer
taken into account.
“VOL”value increases like 1, 2, 3 ... if rotating VOLUME
knob in “+”direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. Also when DISC 3 is pressed after lighting of all LEDs and FL
tubes, value of VACS appears.
9. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.

13
[MCTest Mode]
•This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
Procedure:
1. Press the three buttons of x, ENTER and DISC 3
simultaneously.
2. A message “TEST MODE”appears on the FL display tube.
3. When f(CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ AMX”appears.
4. When F(CURSOR DOWN) button ispressed, GEQ decreases
to its minimum and a message “GEQ MIN”appears.
5. When g(CURSOR LEFT) or G(CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
6. When the VOLUME control knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX”appears for two seconds, then the
display returns to the original display.
7. When theVOLUME control knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN”appears for two seconds, then
the display returns to the original display.
8. In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channelthat hasbeen stored inmemory,by operatingthe Shuttle
knob. (It means that the memory is cleared.)
9. When CD is selected and the EDIT button is pressed, the disc
that is being chucked at this moment becomes the default
setting. It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly. At the same time, the DISK SKIP EX-
CHANGE and OPEN/CLOSE cannot beaccepted. (Itmeans
that the tray motor and the turntable motor are disabled of their
operation.)
10. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
11. When xbutton is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound using the Shuttle knob, tape
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started. If
PAUSE is inserted even once during recording, tape is rewound
to the position around the PAUSE position and is played back.
12. When the CD SYNCHI-DUB Button is pressduring playback
of Deck B, either normal speed or high speed can be selected
by this button.
13. Select the desired loop by pressing the PLAY MODE button.
Insert a test tapeAMS-110A or AMS-RO to DeckA.
14. Press the SPECTRUM button to enter theAMS test mode.
15. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
16. Then the REWAMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
17. When the check is complete, a message of either OK or NG
appears.
18. When you want to exit this mode, press the ?/1button twice.
The cold reset is enforced at the same time.

14
[Tape Aging Mode]
This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.
•If an error occurred:
The aging operation stops and displays then status.
•If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Load the tapes into the decks A and B respectively.
2. Press the CD button to select the function “CD”.
3. Press the PLAY MODE button to set the ALL DISCS mode,
and press the REPEAT button to “REPEAT”off.
4. Press three buttons of p, ENTER , and DISC SKIP/EX-
CHANGE simultaneously.
5. The aging mode is activated.
6. To exit from the aging mode, press the 1/ubutton to turn the
power OFF and operate the cold reset. (Refer to the “MC Cold
Reset”)
1. Display at the Aging Mode
•Display operating state of tape deck section alternately.
•If an error occurred, stop display.
2. Tape Deck Section
•The sequence during the aging mode is following as below.
•If an error occurred, stop display that step.
Aging mode sequence (Tape deck section) :
Rewind the tape A and B
“TAPE A AG-1”
Shut off
FWD play the tape A
“TAPE A AG-2”
2 minutes
Fast forward the tape A
“TAPE A AG-3”
Shut off or 20 seconds
REV play the tape A
“TAPE A AG-4”
2 minutes
Rewind the tape A
“TAPE A AG-5”
Shut off
FWD play the tape B
“TAPE B AG-2”
2 minutes
Fast forward the tape B
“TAPE B AG-3”
Shut off or 20 seconds
REV play the tape B
“TAPE B AG-4”
2 minutes
Rewind the tape B
“TAPE B AG-5”
Shut off
Note: “TAPE *AG-*”is display of each step.

15
[CD Aging Mode]
Procedure:
1. Short SL501 by soldering.
2. Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
3. Press the SELECT/gG button. The aging mode starts.
4. Aging status appears on the monitor screen.
How to exit the CD aging mode:
1. Press the ?/1 and turn off the main power.
2. Remove soldering from SL501.
[Function Change Mode]
* elect either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Press the two buttons ENTER and ?/1 at the same time.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD”or
“VIDEO”.
[VIDEO CD Color-bars Mode]
On this mode, the data of the color-bars signal as a picture signal
and the 1 kHz sine wave signal as a sound signal are output by the
mechanismcontroller(IC502) forthe video CDsignalcheck. When
measurement of the voltage and waveform on the VIDEO board,
perform it in this mode.
For reference, the color-bars signal can be observed at J302 (VIDEO
OUT) using an oscilloscope.
Procedure:
1. Short the both ends of the land of SL503 of theVIDEO board.
2. Turn the power on. Press the CD button to select CD.
3. The color-bars appears when the CD is in stop status, and it
disappears when the CD goes in play status.
4. After measuring, remove the lead wire connected.VIDEO board
(SIDE B)
TOC reading
Last track is played bac
k
First track is played bac
k
OPEN
CLOSE
Monitor Display
1st line OPEN/CLOSE/CD PLAY display
2nd line DISC1/DISC1-15/DISC1-1/TIME display
4th line COUNT : 1 display
5th line TOTAL ERR : 00 display
6th line JITTER FF display
3rd line AGING
[CD Servo ON/OFF Mode]
Procedure:
1. Short SL502 on the VIDEO board by soldering.
2. Turn on the main power. Set a disc on the DISC1 tray. Select
CD.
3. Press the hH button to play back CD.
4. When the >+ button is pressed, 100track jump is executed.
5. Also, every pressing of the PLAY MODE button triggers
between ON and OFF of TRACKING SERVO and SLED
SERVO.
How to quit the CD servo ON/OFF mode:
1. Press the ?/1 button to turn off the main power.
2. Remove soldering from SL502.
VIDEO board (SIDE A)
J301 J302
CN501
CN503
SL503
SL502
SL501
CHECK LED
CN502

16
SECTION 5
MECHANICAL ADJUSTMENTS SECTION 6 ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
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
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
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.
•Test Tape
Record/Playback Head Azimuth Adjustment
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 LevelAdjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
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
supply voltage unless otherwise noted.
Torque Measurement
set
MAIN board
CN301
Pin 3(L-CH)
Pin 1(R-CH)
MAIN board
CN301
Pin 2(GND)
+
–
level mete
r
test tape
P-4-A100
(10 kHz, –10 dB)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
6.96 N •m to 14.02 N •m
71 to 143 g •cm
(0.98 –1.99 oz •inch)
9.80 N •m
100 g or more
(3.53 oz or more)
9.80 N •m
100 g or more
(3.53 oz or more)
Mode Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension

17
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 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Tape Speed Adjustment DECK B
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
CD SYNC HI-DUB button.
Procedure:
1. Turn the power switch on.
2. Press the xbutton, ENTER button and DISC 3 button
simultaneously.
(The “TEST MODE”on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the ?/1button.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the gG button on the deck B.
3. Press the CD SYNC HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 30 Hz.
5. Press the CD SYNC HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 15 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
Deck A is RV302 (L-CH) and RV352 (R-CH), Deck B is RV303
(L-CH) and RV353 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN301 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: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin 1
oscilloscop
e
L-CH
R-CH
VH
waveform of oscilloscope
in phase 45°90°135°180°
good wrong
pin 2
pin 3
L
R
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
CN301 (Pin 3: L-CH)
(Pin 1: R-CH)
frequency counte
r
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN301 (Pin 3: L-CH)
(Pin 1: R-CH)
level meter
forward
reverse

18
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
[LEAF SW BOARD] (Component Side)
REC Bias Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode”is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotette
of shuttle knob then rewind to recording start position.)
1. Press MD(VIDEO) button to select MD. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV304
(L-CH) and RV354 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ±1.0 dB
Adjustment Location: MAIN board
REC Level Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode”is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
1. Press MD(VIDEO) button to select MD. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
attenuator
set
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



600 Ωblank tap
e
CN-123
AF OSC
+
–
set
recorded
portion
MAIN board CN301C(Pin 3: L-CH)
(Pin 1: R-CH
)
level meter
set
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB) blank tape
CS-123
600 Ω
attenuator
AF OSC
+
–
set
recorded
portion
MAIN board CN301C(Pin 3: L-CH)
(Pin 1: R-CH
)
level meter
TAPE SPEED
RV1002 RV1001
(NORMAL) (HIGH)
CN1001
T601
RV611
RV351
RV354
RV304
RV303
RV352
RV302
RV353
RV301
CN301 CN304
CN302
13
REC LEVEL (L)
(B)
PB LEVEL (L)
(B)
PB LEVEL (R)
(A)
PB LEVEL (L)
(A)
PB LEVEL (R)
(B)
BIAS LEVEL (R)
BIAS LEVEL (L)
REC LEVEL (R)
(B)

19
FMTuned Level Adjustment
Procedure:
1. Supply a 28 dB 98 MHz signal from theANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV611 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1. Supply a 60 dB 98 MHz signal from theANTENNA terminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin 21 of IC 601. Adjust T601 ubtil
the voltage becomes 0 V.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] Component side
FM RF SSG
75 Ωcoaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)
FM ANTENNA terminal
(TM601)
set
FM RF SSG
75 Ωcoaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75 W open)
FM ANTENNA terminal
(TM601)
set
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCONT) andTP (GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
6. Confirm that the oscilloscope waveform (S-curve) is
symmetrical betweenA and B. And confirm peak to peak level
within 4 ±1 Vp-p.
7. After check, remove the lead wire connected in step 2 and 3.
Note : •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.
RF Level Check
Procedure :
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCONT) andTP (GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirmthat oscilloscope waveformis clearandcheckRF signal
level is correct or not.
6. After check, remove the lead wire connected in step 2.
BD board Oscilloscope
TP(FEO)
TP(VC)
symmetry
S-curve waveform
within 4 ±1Vp-p
A
B
TP(RF)
TP(VC)
BD board oscilloscope
T601
RV611
RV351
RV354
RV304
RV303
RV352
RV302
RV353
RV301
CN301 CN304
CN302
13
NULL
FM TUNED LEVEL

20
Note : Clear RF signal waveform means that the shape “◊”can be clearly
distinguished at the center of the waveform.
E-F Balance (1Track jump) Check
Procedure :
1. Connect oscilloscope to TP (TEO) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the Xbutton. (Becomes the 1 track jump mode.)
5. Confirm that the level B andA (DC voltage) on the oscilloscope
waveform.
6. After check, remove the lead wire connected in step 1.
RF signal waveform VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45 ±0.3Vp-p
TP(TEO)
TP(VC)
BD board oscilloscop
e
level=1.3 ±0.6Vp-p symmetry
A (DC voltage
)
center of
waveform
B
0V
1 track jump waveform
Specified level: –– ×100=less than ±22%
B
A
Adjustment Location:
[BD BOARD] (Conductor Side)
TP (RF)
TP (VC)
IC103
IC101
TP (TEO)
TP (FE0)