Sony HCD-M500AV User manual

1
HCD-M500AV
SERVICE MANUAL
HCD-M500AV is the tuner, deck, CD and
amplifier section in MHC-M500AV.
SPECIFICATIONS
COMPACT COMPONENT SYSTEM
— Continued on next page —
Model Name Using Similar Mechanism HCD-MC3AV
CD Mechanism Type CDM-46B1
Optical Pick-up Name KSM-213BFN/C2NP
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type TCM-230AWR21
CD
SECTION
TAPE DECK
SECTION
US Model
Amplifier section
U.S.A models:
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 6 Ωloads both channels driven, from 120 – 10,000 Hz; rated 75 W per
channel minimum RMS power, with no more than 10% total harmonic
distortion from 250 mW to rated output.
Front Speaker:
Continuous RMS power output
75 + 75 W
(6 Ωat 1 kHz, 10% THD)
Total harmonic distortion
less than 0.09%
(6 Ωat 1 kHz, 40 W)
Center Speaker:
Continuous RMS power output
35 W
(6 Ωat 1 kHz. 10% THD)
Rear Speaker:
Continuous RMS power output
35 + 35 W
(6 Ωat 1 kHz, 10% THD)
Inputs
VIDEO/MD IN (phono jack):
voltage 250 mV/450 mV,
impedance 47 kΩ
DVD
FRONT (phono jacks): voltage 450 mV,
impedance 47 kΩ
REAR (phono jacks): voltage 450 mV,
impedance 47 kΩ
CENTER (phono jacks): voltage 450 mV,
impedance 47 kΩ
WOOFER (phono jacks): voltage 450 mV,
impedance 47 kΩ
Outputs
PHONES (stereo phone jacks):
accepts headphones of 8 Ωor more
FRONT SPEAKER: accepts impedance of 6 to 16 Ω
REAR SPEAKER: accepts impedance of 6 to 16 Ω
CENTER SPEAKER: accepts impedance of 6 Ω
SUPER WOOFER: voltage 1 V, impedance 1 kΩ
Manufactured under license from Dolby
Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol ;and
“PRO LOGIC” are trademarks of Dolby
Laboratories Licensing Corporation.
Ver 1.12001. 07
9-929-288-12
2001G0200-1
© 2001.7
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group

2
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser (λ=780 mm)
Emission duration: continuous
Laser output Max. 44.6 µW*
* 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.
Frequency response 2 Hz –20 kHz (± 0.5 dB)
Wavelength 780 –790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wave length 600 nm
Output level –18 dBm
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 87.5 –108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 Ωunbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range 530 –1,710 kHz
(with the interval set at 10 kHz)
531 –1,710 kHz
(with the interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements 120 V AC, 60 Hz
Power consumption 210 W
Dimensions (w/h/d) Approx. 280 ×373 ×468 mm
Mass Approx. 11.0 kg
Supplied accessories: AM loop antenna (1)
Remote commander (1)
Batteries (2)
FM lead antenna (1)
Speaker cords (2)
Center speaker pads (4)
Manual connecting cord (1)
Design and specifications are subject to change without notice.

3
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE WITH
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.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
SAFETY CHECK-OUT
(US model only)
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized”knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit”indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15µF
To Exposed Metal
Parts on Set
1.5kΩ
AC
voltmeter
(0.75V)
Earth Ground

4
TABLE OF CONTENTS
1. GENERAL
Font Panel ··············································································· 5
Rear Panel ·············································································· 6
2. DISASSEMBLY ······························································· 8
3. TEST MODE ··································································· 16
4. MECHANICAL ADJUSTMENTS ···························· 18
5. ELECTRICAL ADJUSTMENTS
Deck Section ········································································ 21
CD Section ··········································································· 23
6. DIAGRAMS
6-1. Block Diagram –CD Section – ········································ 24
Block Diagram –Main Section – ····································· 25
Block Diagram –Audio Section – ···································· 26
6-2. Circuit Boards Location ··················································· 27
6-3. Printed Wiring Board –BD Section – ······························ 28
6-4. Schematic Diagram –BD Section – ································· 29
6-5. Printed Wiring Board –CD Motor Section – ··················· 30
6-6. Schematic Diagram –CD Motor Section – ······················ 31
6-7. Printed Wiring Board –Audio Section – ·························· 32
6-8. Schematic Diagram –Audio Section – ····························· 33
6-9. Printed Wiring Board –Main Section – ··························· 34
6-10. Schematic Diagram –Main (1/6) Section – ····················· 35
6-11. Schematic Diagram –Main (2/6) Section – ····················· 36
6-12. Schematic Diagram –Main (3/6) Section – ····················· 37
6-13. Schematic Diagram –Main (4/6) Section – ····················· 38
6-14. Schematic Diagram –Main (5/6) Section – ····················· 39
6-15. Schematic Diagram –Main (6/6) Section – ····················· 40
6-16. Printed Wiring Board –Power Section – ························· 41
6-17. Schematic Diagram –Power Section – ···························· 41
6-18. Printed Wiring Board –Panel Section – ··························· 42
6-19. Schematic Diagram –Panel Section – ····························· 43
6-20. Printed Wiring Board –Front Amp Section – ·················· 44
6-21. Schematic Diagram –Front Amp Section – ····················· 45
6-22. Schematic Diagram –Rear Amp Section – ······················ 46
6-23. Printed Wiring Board –Rear Amp Section – ··················· 47
6-24. Waveforms ········································································ 48
6-25. IC Pin Function Description ············································· 48
6-26. IC Block Diagrams ··························································· 56
7. EXPLODED VIEWS ····················································· 59
8. ELECTRICAL PARTS LIST ····································· 66
SERVICING NOTES
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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check”in “CD section adjustment”and check
that the S curve waveform is output repeatedly.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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 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.

5
SECTION 1
GENERAL
FRONT PANEL
1@/1 button
2STANDBY indicator
3MEMO INPUT button
4MEMO SCAN button
5MEMO SEARCH button
6TAPE A hbutton and indicator
7CD 7button and indicator
8TAPE A Hbutton and indicator
9Display window
0x(STOP) button
qa TAPE B hbutton and indicator
qs TUNER/BAND button
qd TAPE B Hbutton and indicator
qf CHECK button
qg CLEAR button
qh DELETE button
qj GROOVE button and indicator
qk FUNCTION button
ql DSP button and indicator
w; DBFB button
wa CONTINUE/STEREO/MONO button
ws ENTER button
wd PROGRAM/TUNER MEMORY button
wf SHUFFLE/DIRECTION button
wg + M>button
wh .m– button
wj SELECTOR dial
wk PHONES jack
wl FILE SELECT button
e; VOLUME knob
ea XPAUSE button and indicator
es CD SYNCHRO button
ed zREC button
ef CD PLUS ONE button
eg TIMER SELECT button and indicator
eh CLOCK TIMER SET button
ej DISPLAY button
ek PROLOGIC button and indicator
el DVD5.1CH button and indicator
1
el
ef
eg
eh
ej
ek
2
3
4
5
678 90 qaqsqd qfqgqh
qj
qk
w;
wa
ws
wd
wf
wg
wh
wj
wk
wle;eaesed
ql

6
REAR PANEL
1CD DIGITAL OUT connector
2SUPER WOOFER jack
3DVD INPUT jack
4MD/VIDEO INPUT (AUDIO) jack
5ANTENNA terminal
6CENTER SPEAKER terminal
7REAR SPEAKER terminal
8FRONT SPEAKER terminal
9AC power cord
1
2
4
3
5 6 7 8
9

7
This section is extracted from
instruction manual.

8
SECTION 2
DISASSEMBLY
2-1. CASE
2-2. FRONT PANEL SECTION
Note : Follow the disassembly procedure in the numerical order given.
1Three screws
(CASE3 TP2)
1Three screws
(CASE3 TP2)
2Three screws
(BVTP 3 ×8)
3Case
7Screws
(BVTT 3 ×8)
8Lug 4Connector(CN804)
5Connector(CN604A
)
6Connector(CN453)
1Wire (flat type)
(17 core)
2Wire (flat type)
(15 core)
0Two claws
qa Front panel assy
0Two claws
9Three screws
(BVTP 3 ×8)
3Wire (flat type) (10 core)

9
2-3. DOOR ASSY
2-4. BACK PANEL
2Open the door assy
1Two screws
(PTPWH 2.6 ×8)
A3Remove the door ass
y
to direction of the
arrow A.
7Eight screws
(BVTP 3 × 8)
5Three screws
(BVTP 3 × 8)
6Two screws
(BVTP 3 × 8)
3Five screws
(BVTP 3 × 8
)
4Cover
8Remove the back panel
to direction of the arrow.
2Connector(CN751)
1Connector
(CN802)

10
2-5. MAIN BOARD
2-6. POWER TRANSFORMER (T991)
qa Remove the MAI
N
board to direction
of the arrow.
0Two screws
(BVTP 3 × 8)
2Wire (flat type) (9 core)
1Wire (flat type) (16 core)
7Connector(CN451)
3Connector(CN902)
4Connector(CN801B)
6Connector(CN461)
8Connector(CN403)
5Connector(CN454)
9Connector(CN454)
6
Four screws
(BVTT 3 × 8)
7Power transforme (T991)
3Connector CN995
4Two screws
(BVTT3 x 8)
5Sub trans board
1Connector CN992
2Power cor
d

11
2-7. SUB CHASSIS
2-8. CD MECHANISM DECK SECTION
1Two screws
(BVTT 3 × 8)
3Sub chassis
2Three screws
(BVTP 3 × 8)
2Two screws
(BVTP 3 × 8)
8
Three screws
(BVTT 3 × 10)
9Base (LOADING)
3Two screws
(BVTP 3 × 8)
4Cover (CD)
qs Base (CDM)
qa Screw
(BVTT 3 × 10)
0Screw
(BVTT 3 × 14)
5Two screws
(BVTT 3 × 6)
7Reinforcement
1Screw
(PTPWH 2.6 × 8)
2Table (50)
6Wire holder

12
2-9. CD BASE UNIT
2-10. BD BOARD, SLED MOTOR (M102)
1Two screws
(BTVP 3 × 8)
2Bracket
3Two tention springs
5Base unit
4Four screws
(PTPWH 2.6 × 8)
6Gear (A) (S)
5Claw
0Two screws (P 2 ×3)
qa Sled motor
(M102)
3Removal
four solders.
2Screw (PTPWH 2 ×5)
4BD board
1Wire (flat type) (16 core)
9Gear (B) (RP)
7Three claws
8Gear cover

13
2-11. OPTICAL PICK-UP
2-12. TAPE MECHANISM DECK SECTION
3Remove the optical
pick-up to direction
of the arrow A.
2Sled shaft
1Claw
A
2Remove the cassette lid (L) assy
to direction of the arrow B.
1Remove the cassette lid (R) assy
to direction of the arrow A.
A
B3Three screws
(BVTP 2.6 ×8)
3Three screws
(BVTT 3 ×6)
4Remove the tape mechanism
deck section.

14
2-13. PANEL BOARD
qa Five screws
(BVTP 2.6 ×8)
qa Nine screws
(BVTP 2.6 ×8)
8Volume ring
7Volume knob
9Selector ring
0Selector ring
qa Five screws
(BVTP 2.6 ×8)
3Remove the
cassette lid (R) assy
3Remove the
cassette lid (L) assy
4Remove the spring (A deck)
4Remove the spring (B deck)
5Two screws
(BVTP 2.6 ×8)
6Remove the
TC bracket
qs Remove the panel (L) board
qf Remove the panel board
qd Remove the panel (R) board
1
2
2
1

15
2-14. CASSETTE BOARD
2-15. CAPSTAN MOTOR (M1)
3Two screws
(BVTT 2 ×4 (S))
2Break the soldering of tw
o
flexible flat cables.
1Four rivets
4CASSETTE board
3Remove the belt.
1Two screws
(PS 2.6 ×5)
2Remove the belt.
4
Remove the capstan motor
to direction of the arrow.

16
SECTION 3
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 the three buttons x, ENTER and @/1 at the same
time.
2. The fluorescent indicator tube turns off for a moment and the
RAM is reset to the initial conditions.
[MC Hot Reset]
* This mode resets the set with the preset data kept stored in the
memory. This hot reset mode is performed also when the power
cord is plugged in and out.
Procedure:
1. Press the three buttons x, ENTER and FUNCTION at the
same time.
2. The fluorescent indicator tube turns off for a moment and the
RAM is reset to the initial conditions.
[CD Initial]
* The CD INITIAL clears all of the CD related data. Execute
this mode when returning the set to the customer.
Procedure:
1. Press the three buttons x, ENTER and CONTINUE/
STEREO/MONO at the same time.
2. The message “STANDBY” appears on the fluorescent indicator
tube and the CD related data is reset to the initial conditions.
[CD Line Test]
* The CD Line test displays the rotating time required for one
rotation by rotating the disc tray.
Procedure:
1. Press the three buttons x, ENTER and CLOCK/TIMER SET
at the same time. The CD PLAY LED and the CD PAUSE LED
flash alternately and the disc tray starts rotation.
2. The message “xx << y.y” appears on the fluorescent indicator
tube. The left numbers count up the discs starting from 1 to 51.
The left numbers “y.y” indicate the rotating time required for
one rotation by rotating the disc tray.
3. To exit the CD LINE test mode, execute the MC Hot Reset.
[CD Memo All Clear]
* The mode clears all contents of the CD disc memo. Execute
this mode when returning the set to the customer.
Procedure:
1. Press the two buttons MEMO INPUT and ENTER at the
same time.
2. The message “ALL ERASE” appears on the fluorescent indicator
tube and the CD disc memo is all cleared.
[GC Test Mode]
* This mode checks microprocessor version number, keys,
fluorescent tubes, LEDs and VACS (Variable Attenuation
Control System).
Procedure:
1. Press the three buttons x, ENTER and DISPLAY at the
same time. The set enters the GC test mode, and all of the
fluorescent tubes and LEDs turn on.
2. From this state, any one of the three modes MODEL NAME,
KEY CHECK and VACS can be selected. Go to step 3 to enter
the MODEL NAME test mode. Go to step 5 to enter the KEY
CHECK test mode. Go to step 11 to enter the VACS test mode.
3. [MODEL NAME test mode ] From the state of step 2, press the
CONTINUE/STEREO/MONO button. Every pressing of the
CONTINUE/STEREO/MONO button advances the following
check modes and displays in the given order. Model name
display, destination display, MC version display, GC version
display, DC version display, VC version display and CC version
display.
4. To exit the GC test mode and to return to the STANDBY mode,
press the x, ENTER and DISPLAY buttons again.
5. [KEY CHECK test mode ] You can enter this mode directly
from step 2. When you performed steps 3, perform steps 4,
then 1 and 2 before starting the step 5.
[KEY CHECK test mode ] From the GC test mode, press the
PROGRAM/TUNER MEMORY button to enter the key check
mode.
The display: K 1, J 0, V 0 appears.
6. The value after K indicates the number of times that the key is
pressed. 1 is displayed because the PROGRAM/TUNER
MEMORY button has already been pressed.
7. When other keys are pressed one after another, the key count
increases up to 43. The keys which have already been pressed,
are not counted.
8. The value after J indicates the number of clicks that the JOG
dial is rotated. The clockwise rotation increases the count value.
The counter-clockwise rotation decreases the count value.
9. The value after V also indicates amount of rotation of volume
control. The clockwise rotation increases the count value. The
counter-clockwise rotation decreases the count value.
10. To exit the GC test mode and to return to the STANDBY mode,
press the x, ENTER and DISPLAY buttons again.
11. [VACS test mode ] You can enter this mode directly from step
2. When you performed steps 3, perform steps 4, then 1 and 2
before starting the step 5.
[VACS test mode ] From the GC test mode, press the SHUFFLE
button to enter the VACS attenuation check mode. The display:
VOL NORMAL appears.
12. To exit the GC test mode and to return to the STANDBY mode,
press the x, ENTER and DISPLAY buttons again.
[Aging Mode]
The decks A and B are operated automatically for aging purpose.
When errors occur during aging, causes of errors are displayed and
the aging mode is stopped.
How to enter the aging mode
1. Turn on the main power. Install a playback tape to deck A and
install a blank tape to deck B.
2. Select TAPE A with the FUNCTION button.
3. Press the three buttons of x, ENTER and SHUFFLE at the
same time to enter the aging mode.
How to exit the aging mode.
Turn off the main power.
1. Rewind the tapes A and B. Tapes stop at the shut-off of tape A
and the aging mode advances to the next step.
The message: TAPE A AG-1 appears.

17
2. The tape A is played back in the FWD mode. After two minutes
of the FWD playback, the aging mode advances to the next
step.
The message: TAPE A AG-2 appears.
3. The tape A runs in fast forward. After two minutes of fast
forward, or at the shut-off point, the tape is stopped and the
aging mode advances to the next step.
The message: TAPE A AG-3 appears.
4. The tape A is played back in the RVS mode. After two minutes
of the RVS playback, the aging mode advances to the next step.
The message: TAPE A AG-4 appears.
5. The tape A is rewound and stops at the shut-off. The aging
mode advances to the next step.
The message: TAPE A AG-5 appears.
6. The tape B is played back in the FWD mode. After two minutes
of the FWD playback, the aging mode advances to the next
step.
The message: TAPE B AG-2 appears.
7. The tape B runs in fast forward. After two minutes of fast
forward, or at the shut-off point, the tape is stopped and the
aging mode advances to the next step.
The message: TAPE B AG-3 appears.
8. The tape B is played back in the RVS mode. After two minutes
of the RVS playback, the aging mode advances to the next step.
The message: TAPE B AG-4 appears.
9. The tape B is rewound and stops at the shut-off. The aging
mode advances to the next step.
The message: TAPE B AG-5 appears.
[AM TUNER STEP 9 kHz/10 kHz Selection Mode]
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
Procedure:
1. Turn on the power and select TUNER using the FUNCTION
button.
2. Select AM with the TUNER/BAND button and turn off the
power.
3. Press the two buttons ENTER and @/1 at the same time. The
main power is turned on and the other frequency step of the
previous mode is selected and displayed. “AM 9 k STEP”or
“AM 10 k STEP”
[CD SRAM Test Mode]
Procedure:
1. Turn on the power and select CD using the FUNCTION button.
2. Press the three buttons x, ENTER and DBFB at the same
time.
3. The message “SRAM OK”appears on the fluorescent indicator
tube.
[GC VACS ON/OFF Mode]
Procedure:
1. Press the two buttons DELETE and @/1 at the same time.
2. The message “VACS ON”or “VACS OFF”appears on the
fluorescent indicator tube.

18
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)
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
SECTION 4
MECHANICAL ADJUSTMENTS
•TAPE MECHANISM DECK SECTION • Torque Measurement
•CD MECHANISM DECK SECTION
To adjust the mechanism section, enter the mechanism section adjustment mode.
For how to enter the mechanism section adjustment mode, refer to each adjustment section.
DISC SENSOR ALIGNMENT
1. Make sure that there is no disc in the unit.
2. Connect an oscilloscope to IC401rs, IC4014of the MAIN board.
3. Press the @/1 button to turn ON the power.
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 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.
Mode Torque meter Meter reading
4. Press the xbutton, ENTER button and CLOCK/TIMER SET button simultaneously.
oscilloscope
IC401rs D.SENS (CH1)
IC4014HHOUT (CH2)
GND

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5. The disc table rotates in the clockwise direction. The disc table rotation time is displayed with “PLUS ONE”slit as a measuring point.
6. Measure the waveform of the oscilloscope when the disc table is rotating.
7. Move the holder (sensor) center so that the flat portion center at the top of the D.SENS (CH1) input waveform and the “H”center of
HHOUT (CH2) coincide.
8. Tighten the fixed screw to fix the disc table, then press the CLEAR button.
9. The disc table rotates in the counterclockwise direction. Measure the waveform and make sure that the flat portion center at the top of the
D.SENS (CH1) input waveform and the “H”center of HHOUT (CH2) coincide.
10. If the adjustment is not successful, press the CLEAR button to rotate the disc table in the clockwise direction, and perform steps 6 to 9.
Note: During the adjustment mode, the rotational direction is switched each time the CLEAR button is pressed.
Pressing the CHECK button enters the loading mode which will be described later. Pressing the CLEAR button rotates the disc table
again.
PLUS ONE
HHOUT (CH2) waveform
D.SENS (CH1) waveform
Flat portion center of
D.SENS (CH1) waveform
Fixed screw
Holder (sensor)

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MAGNET ASSY ALIGNMENT
1. Check that there is no disc in the unit and then press the @/1 button to turn ON the power. Open the door, and set a disc in the PLUS
ONE slit.
2. Close the door, and while pressing the xbutton, ENTER button and CLOCK/TIMER SET button simultaneously.
3. Press the CHECK button, and set the loading mode.
4. Press the + JLbutton and chuck the disc.
5. Adjust the magnet assembly and magnet holder so that A = B as shown in the figure.
DISC HOLDER A ALIGNMENT
1. Check that there is no disc in the unit and then press the @/1 button to turn ON the power. Open the door, and set a disc in the PLUS
ONE slit.
2. Close the door, and while pressing the xbutton, ENTER button and CLOCK/TIMER SET button simultaneously.
3. Press the CHECK button, and set the loading mode.
4. Press the + JLbutton and chuck the disc.
5. Press + JLor lj–button to stop the disc holder A slightly away from the disc.
6. Rotate and adjust the adjusting screw so that the center of the disc and that of the disc holder coincide.
AB
Magnet ASSY
Magnet holder
Magnet ASSY
Screw (For adjustment)
Disc
Disc holder A
Disc holder A Screw (For adjustment
)
Disc
a = b
ab