Sony HCD-V818 User manual

– 1 –
E Model
SPECIFICATIONS
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
— Continued on next page —
MICROFILM
HCD-V818
HCD-V818 is the tuner, deck, Video CD
and amplifier section in MHC-V818.
Model Name Using Similar Mechanism HCD-V800
CD Mechanism Type CDM38L-5BD24AL
Base Unit Type BU-5BD24AL
Optical Pick-up Type KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-GRX8/R800/RX88/RX99
TapeTransport Mechanism Type TCM-230AWR1
TCM-230PWR1
CD
SECTION
TAPE
DECK
SECTION

– 2 –
SELF DIAGNOSIS
This unit is equipped with a self-diagnosis function.
The function is used for diagnosing the conditions of the circuits of the VIDEO board.
The circuits can be determined if normal or abnormal by the lighting of D502 of the VIDEO board.
Lighting of D502
When lit : Operates normally
Blinks repeatedly : The circuit may be faulty.
[VIDEO BOARD] (SIDE A)
SL501
D502
SL502
IC507
IC505
CT503
SL503
TEST MODE
VIDEO
FREQUENCY

– 3 –
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation 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.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.
The following
caution label is
located inside of
the unit.
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.
PARTS No.
4-999-907-0π
4-999-907-1π
4-999-907-3π
4-999-907-4π
4-999-907-5π
MODEL
SP, MY
EA
HK
TW
IA
MODEL IDENTIFICATION
— BACK PANEL —
• Abbreviation
EA : Saudi arabia model
HK : Hong Kong model
SP : Singapore model
MY : Malaysia model
TW : Taiwan model
IA : Indonesian model.
Parts No.
NOTES ON HANDLINGTHE 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, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the“S curve check” in“CDsectionadjustment”andcheck
that the S curve waveform is output two times.

– 4 –
1. SERVICING NOTE ..........................................................5
2. GENERAL ..........................................................................6
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 9
3-2. Front Panel ........................................................................... 9
3-3. Cassette Mechanism Deck .................................................. 10
3-4. Panel Board and Cont Com Board ......................................10
3-5. Disc Tray ........................................................................... 11
4.TEST MODE .................................................................... 12
5. SERVICE MODE ............................................................14
6. MECHANICAL ADJUSTMENTS ..........................16
7. ELECTRICAL ADJUSTMENTS ............................... 16
8. DIAGRAMS
8-1. Circuit Boards Location ......................................................22
8-2. Block Diagrams
• CD Section ....................................................................... 23
• Video Section ................................................................... 25
• Deck Section .................................................................... 27
• Main Section .................................................................... 29
• Power Section ..................................................................31
• Display Section ................................................................ 33
• Section ............................................................... 35
8-3. Printed Wiring Board – CD Section –.................................37
8-4. Schematic Diagram – CD Section – ................................... 39
8-5. Schematic Diagram – Deck Section – ................................41
8-6. Printed Wiring Board – Deck Section –..............................43
8-7. Printed Wiring Board – Video Section –............................. 45
8-8. Schematic Diagram – Videon (1/3) Section – ..................... 47
8-9. Schematic Diagram – Videon (2/3) Section – ..................... 49
8-10. Schematic Diagram – Videon (3/3) Section – ..................51
8-11. Printed Wiring Board – Main Section – ........................... 53
8-12. Schematic Diagram – Main (1/4) Section – .....................55
8-13. Schematic Diagram – Main (2/4) Section – .....................57
8-14. Schematic Diagram – Main (3/4) Section – .....................59
8-15. Schematic Diagram – Main (4/4) Section – .....................61
8-16. Printed Wiring Board – Mic/HP Section – ....................... 63
8-17. Schematic Diagram – Mic/HP Section – .......................... 64
8-18. Printed Wiring Board – PowerAmp Section –................. 65
8-19. Schematic Diagram – Power Amp Section – ................... 67
8-20. Schematic Diagram – Transformer Section –................... 69
8-21. Printed Wiring Board – Transformer Section – ................71
8-22. Printed Wiring Board – Leaf SW Section – .....................72
8-23. Schematic Diagram – Leaf SW Section – ........................72
8-24. Printed Wiring Board – Display Section – ....................... 73
8-25. Schematic Diagram – Display Section – ..........................75
8-26. Schematic Diagram – Panel Section – ............................. 77
8-27. Printed Wiring Board – Panel Section –........................... 79
8-28. Schematic Diagram – CD Motor Section – ......................81
8-29. Printed Wiring Board – CD Motor Section – ...................83
8-30. IC Block Diagrams ...........................................................85
8-31. IC Pin Functions ...............................................................87
TABLE OF CONTENTS
9. EXPLODEDVIEWS
9-1. Case Section........................................................................ 99
9-2. Chassis Section ................................................................. 100
9-3. Front Panel Section ........................................................... 101
9-4. CD Mechanism Deck Section-1 (CDM38L-5BD24AL) .. 102
9-5. CD Mechanism Deck Section-2 (CDM38L-5BD24AL) .. 103
9-6. Base Unit Section (BU-5BD24AL) .................................. 104
9-7. TC Mechanism Section 1
(TCM230AWR1, TCM230PWR1) ................................... 105
9-8. TC Mechanism Section 2
(TCM230AWR1, TCM230PWR1) ................................... 106
10. ELECTRICAL PARTS LIST .................................. 107

– 5 –
SECTION 1
SERVICING NOTE
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
Note for Installation (ROTARY ENCODER)
BU cam
Groove Section A
Note:When attaching the Base unit, Insert the
section A into the groove of BU cam.
Note:When attaching the BU cam,
engage the Rotary encoder
switch as shown in the figure.
3 pull-out the disc tray.
1 Remove the case.
2 Turn the cam to the
direction of arrow.

– 6 –
SECTION 2
GENERAL
Front Panel
23 4 5
6
1
7
8
9
15
12
13
11
1617
10
14 192018
21 22 23
30
31
32
33
3536 34
41424344
4546
40
373839484950
515253 47
54
55565758
59
60
61
62
63
64
65
29
24 252627 28

– 7 –
LOCATION OF PARTS AND CONTROLS
11/u (POWER) button
2DISC 1 button and indicator
3DISC 2 button and indicator
4DISC 3 button and indicator
5DISC SKIP/EX-CHANGE button
6§(EJECT) button
7Disc tray
8VIDEO CD indicator
9PBC indicator
10 PCB OFF indicator
11 PLAY MODE/DOLBY NR TUNER MEMORY button
12 EDIT/DIRECTION button
13 REPEAT/STEREO/MONO button
14 FUNCTION button
15 TAPEA 9button and indicator
16 TAPEA (button and indicator
17 TAPE B 9button and indicator
18 TAPE B (button and indicator
19 CD ^button and indicator
20 TUNER/BAND button
21 KARAOKE PON/MPX button
22 SURROUND button
23 SONIC FORMATION button and indicator
24 ACTIVE button
25 SELECT button
26 RETURN button
27 PREV button
28 NEXT button
29 rREC button and indicator
30 PPAUSE button and indicator
31 HI-DUB button
32 CD SYNC button
33 PHONES jack
34 VOLUME, +, – knob
35 GROOVE button and indicator
36 DBFB button
37 ), + button and indicator
38 ENTER/NEXT button and indicator
39 JOG dial
40 pbutton
41 P FILE MEMORY button
42 GEQ CONTROL button
43 FILE SELECT button
44 FILE button and indicator
45 AUTO BPM button and indicator
46 0, – button and indicator
47 JAM button and indicator
48 SPEED button
49 SELECT button
50 ON/OFF button and indicator
51 BEAT LEVEL button
52 PAD B button
53 PAD A button
54 MIC 2 jack
55 MIC 1 jack
56 CD NON-STOP button and indicator
57 CD FLASH button
58 CD LOOP button
59 MIC LEVEL knob
60 ECHO LEVEL knob
61 DEMO button
62 DISPLAY button
63 TIMER/SELECT button
64 CLOCK/TIMER SET button
65 Display window

– 8 –
This section is extracted from
instruction manual.

– 9 –
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
3-1. LOADING PANEL
3-2. FRONT PANEL
3 Loading panel
2 Pull-out the disc tray.
1 Turn the cam to the direction
of arrow.
Claws
1 Three screws
(BVTP3x8)
9 Front panel assembly
2 Screw
(BVTP3x10)
3 Screw
(BVTP3x10)
4 Connector
(CN203)
5 Connector
(CN752)
8 Flat type wire
(CN101)
7 Flat type wire
(CN106)
6 Flat type wire
(CN107)

– 10 –
3-3. CASSETTE MECHANISM DECK
3-4. PANEL BOARD AND CONT COM BOARD
1 Two screws
(BVTT 2x4)
2 Two screws
(BVTT 2x4)
9 Three screws
(BVTP 2.6x8)
!º Two screws
(BVTP 2.6x8)
!£ Two screws
(BVTP 2.6x8
)
!¡ Screw
(BVTP 2.6x8)
!™ Screw
(BVTP 2.6x8)
!¢ Bracket
!∞ Mechanism deck
3 Damper, oil
4 Damper, oil
5 Push the cassette lids.
6 Remove the cassette lids.
7 Spring
8 Spring
1 Ten screws
(BVTP 2.6x8)
2 Three screws
(BVTP 2.6x8)
!º Four screws
(BVTP 2.6x8)
!¡ Six screws
(BVTP 2.6x8)
3 Panel board
!™ CONT COM board
4 Shield
5 Flat type wire
(CN602)
6 Konb(Jog)
7 Nut
9 Nut
8 Konb(Volume)

– 11 –
3-5. DISCTRAY
Note: When installing the Disc tray, pull around the flat type wire to
pass through the clawA and clawB, as shown in the figure.
(Perfom after removing the front panel.)
Claw B
Claw A
1
Turn the cam the
direction of arrow.
2 Pull-out the disc tray.
5 Remove the disc tray.
4 Two claws
3 Flat type wire (8 core)

– 12 –
SECTION 4
TEST MODE
VIDEO CD COLOR-BARS MODE
On this mode, the data of the color-bars signal as a picture signal and the 1kHz sine wave signal as a sound signal are output by the
mechanism control microcomputer (IC502) for video CD signal check. When measurement of the voltage and waveform on the VIDEO
board, perform it in this mode.
For refernce, the color-bars signal can be observed at J302 (VIDEO OUT) and the sound signal can be observed at J101 (VIDEO/MD
(AUDIO) OUT) using an oscilloscope.
1. Connect the lead wire to both ends of the land of SL503 of the VIDEO board.
2. Turn the power on. Press FUNCTION button to select CD.
3. After 2 or 3 seconds later, connect the lead wire.
4. After measuring, remove the lead wire connected.
[VIDEO BOARD] (SIDE A)
[VIDEO BOARD] (SIDE B)
SL501
D502
SL502
IC507
IC505
CT503
SL503
TEST MODE
VIDEO
FREQUENCY
SL501
IC502
SL502
SL503
TEST
MODE

– 13 –
IC502 OF VIDEO BOARD
IC502 of the VIDEO board consists of the former type and new type. The following table shows the differences between the two types.
Only spare parts for the new type IC502 are supplied.
Units using the former IC502 will not function when replaced with the new type without performing the following procedure.
Consequently, replace IC502 of units using the former type according to the following procedure.
Table of Differences
FORMER TYPE NEW TYPE
C407, 408 MOUNT NO MOUNT
IC502 M306200MC-302FP M306200MC-305FP
JW421, JW422 NO MOUNT MOUNT
IC402 MOUNT NO MOUNT
R413, 421, 422 MOUNT NO MOUNT
X401 MOUNT NO MOUNT
Replacing Procedure
1. Remove IC402.
2. Solder JW421 and JW422, or short-circuit with a lead wire, etc.
3. Replace IC502 with a new one.
How to Differentiate [VIDEO Board] (SIDE A)
Those with IC402: FORMER TYPE
Those without: NEW TYPE
IC505

– 14 –
SECTION 5
SERVICE 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 p, ENTER/NEXT , and 1/u 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 vibration. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press 1/u button to turn the set ON.
2. Press CD LOOP button and 1/u button simultaneously.
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 p, ENTER/NEXT , and DISC 1 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 p, ENTER/NEXT , and §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 )+ utton move the pick-up to outside track, or – 0button to inside track.
5. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Press three buttons in the same manner as step 2.
Note:
• Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be chipped.
Change-over of AMTuner Step between 9kHz and 10kHz
• A step of AM channels can be changed over between 9kHz and 10kHz.
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND button to select the BAND “AM”.
3. Press 1/u button to turn the set OFF.
4. Press ENTER/NEXT and 1/u buttons simultaneously,and the display of fluorescent indicator tube changes to “AM 9k STEP” or “AM
10k STEP”, and thus the channel step is changed over.
LED and Fluorescent IndicatorTube All Lit, Key Check Mode
Procedure:
1. Press three buttons p, ENTER/NEXT , and DISC 2 simultaneously.
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 V0 J0”. 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 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.
Aging Mode
This mode can be used for checking the operations of the CD player and tape deck.
• When problems occur;
Aging stops. If currently aging the tape deck, the state when aging stops will be displayed on the fluorescent indicator tube.
• When no problems;
Aging continues.
Preparations:
• Set the CD on the DISC1 tray.
• Insert a commercially available tape for recording (tapes which contents can be erased, etc.) in decksA and B.

– 15 –
Display of status:
• The aging status is displayed on the fluorescent display tube. (Only when executing the tape deck section.)
• During the aging of the tape deck, the operations performed will be displayed. If operations ended abnormally, this will be displayed at the
fluorescent indicator tube.
Tape Deck
Display of Operations Operation
TAPE A AG-1
TAPE A AG-2
TAPE A AG-3
TAPE A AG-4
TAPE A AG-5
TAPE B AG-1
TAPE B AG-2
TAPE B AG-3
TAPE B AG-4
TAPE B AG-5
TAPEA REW
TAPEA FWD
TAPEA FF
TAPEA REV
TAPEA REW
TAPE B REW
TAPE B FWD
TAPE B FF
TAPE B REV
TAPE B REW
Timing of Ending
Shutoff
2 minute playback
20 seconds or shutoff
2 minutes playback
Shutoff
Shutoff
2 minute playback
20 seconds or shutoff
2 minute playback
Shutoff
Operations during aging
• Operations are performed in the following sequence during aging
<CD player>
1. The CD tray rotates and disc 1 is selected.
2. Chucking is performed.
3. TOC is read.
4. Track 1 played back for 8 seconds.
5. The CD tray opens and closes again.
6. 1 to 5 is repeated.
7. After 12 minutes of aging, aging is switched to the tape deck.
<Tape Deck>
1. The tape in deck A is rewound to the head.
2. The FWD side is played back for 2 minutes.
3. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20 seconds.
4. The REV side is played back for 2 minutes.
5. The tape is rewound to the head (REW).
6. The tape in deck B is rewound to the head.
7. The FWD side is played back for 2 minutes.
8. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20 seconds.
9. The REV side is played back for 2 minutes.
10. The tape is rewound to the head (REW).
11. Aging is switched to the CD player.
Aging of CD player (12 minutes)
Aging of deck A
Aging of deck B Maximum about 12 minutes
Setting the aging mode:
Press the pbutton, ENTER/NEXT button, and DISC SKIP/EX-CHANGE button together.
When the aging mode is set, the CD roulette mark blinks. To exit the mode, press the 1/u button and turn OFF the power.
Sequence:
The aging mode is executed in the following sequence.
If the function is set to “CD” when the aging mode is set, aging is performed starting from the CD player. When set to “TAPEA” or “TAPE
B”, aging is started from deck A.
If the function is set to others, aging will not be started until the function is switched to CD or TAPE.

– 16 –
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.
Torque Measurement
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
Signal Used forTape
SECTION 6
MECHANICAL ADJUSTMENTS
Mode
FWD
Torque meter
CQ-102C
Meter reading
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape SpeedAdjustment
Level Adjustment
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.
L-CH
peak
R-CH
peak
screw
position
output
level within
1 dB
L-CH
peak R-CH peak
screw
position
within 1dB
test tape
P-4-A100
(10kHz, –10dB) main board
CN301
Pin
1 (L-CH)
Pin
3 (R-CH)
level meter
set +
–
main board
CN301
Pin
2
(
GND
)
DECK SECTION 0 dB=0.775V
1. Demagnetize therecord/playbackheadwithaheaddamagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
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 adjustment
should be completed before performing recording circuit adjust-
ment.)
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.
SECTION 7
ELECTRICAL ADJUSTMENTS

– 17 –
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
3. Mode: Playback Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the speed will switch to double speed or
normal speed each time the HI-DUB button is pressed.
Procedure:
With the power turned ON, press the pbutton, ENTER/NEXT
button, and DISC 3 button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the 1/u button.
1. Insert the WS-48B into deck B.
2. Press the ·button of deck B.
3. Press the HI-DUB button and play the tape at double speed.
4. Adjust RV1001 of the LEAF SW board so that the reading of
the frequency counter becomes 6000 ± 180 Hz.
5. Press the HI-DUB button and play the tape at normal speed.
6. Adjust RV1002 of the LEAF SW board so that the reading of
the frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample Value ofWow and flutter
± 0.15% W.Peak (IEC)
0.1% W.RMS (NAB)
± 0.2% W.Peak (DIN)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN301 playback 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
test tape
P-4-A100
(10kHz, –10dB) oscilloscope
set
L
R
Waveform of oscilloscope
in phase 45
°
90 °
135 °
180 °
good wrong
main board
CN301
Pin
1 (L-CH)
Pin
2 (GND)
Pin
3 (R-CH)
Reverse Foward
1 Remove the four claws
2 Window
test tape
P-4-L300
(315Hz, 0dB) level meter
set
main board
CN301
Pin
1 (L-CH)
Pin
3 (R-CH)
RV1002 RV1001
RV1002(Normal Speed
)
RV1001(High Speed)
Adjustment Location
[LEAF SW BOARD]

– 18 –
Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment,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 ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.
(After recording, press the – 0button without stopping will
return to the position where recording was started.)
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the rREC button, and then
press the (button to start recording.
3. Mode: Record
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If these levels do not adjustment level,adjust the RV341 (L-CH)
and RV441 (R-CH) on theAUDIO board to repeat steps 3 and 4.
Adjustment level:The playback output of 10 kHz level difference
against 315 Hz reference should be ± 1.0 dB.
Adjustment Location: AUDIO board
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment, 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 au-
tomatically switch toVIDEO.
(After recording, press the – 0button without stopping will
return to the position where recording was started.)
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the rREC button, and then
press the (button to start recording.
3. Mode: Record
4. Mode: Playback
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If these levels do not adjustment level,adjust the RV301 (L-CH)
and RV351 (R-CH) on the MAIN board to repeat steps 3 and 4.
Adjustment level:
CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
4. Mode: Playback
AF OSC
VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator 600
Ω
} 50 mV (–23.8 dB)
recorded
position level meter
set
main board
CN301
Pin
1 (L-CH)
Pin
3 (R-CH)
AF OSC
VIDEO (AUDIO) IN
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
set
attenuator 600
Ω
recorded
position level meter
set
main board
CN301
Pin
1 (L-CH)
Pin
3 (R-CH)
RV301
Record Level (Lch
)
RV351
Record Level (Rch)
IC301 CN301
1 3
[MAIN BOARD] (Conductor Side)
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
RV301 RV401
RV341(Lch),RV441(Rch)
Record Bias RV311(Lch),RV411(Rch)
Playback Level (Deck A)
RV311 RV411

– 19 –
CD SECTION
NOTE :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lensbyan applicatorwith neutral detergent when
the signal level is low than specified value with the following
checks.
S Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tweenA and B.
And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform
oscilloscope
BD board
TP (FE)
TP (VC) +
–
symmetry
A
B
Within 3
± 1 Vp-p
6. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio
ofA : B or B : A is more than 10 : 7.
• Take sweeptimeaslongas possible and light up the bright-
ness to obtain best waveform.
RF Level Check
oscilloscope
BD board
TP (RF)
TP (VC) +
–
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.3 Vp-p
+0.25
–0.20
oscilloscope
BD board
TP (TE)
TP (VC) +
–
E-F Balance (Traverse) Check (Without remote comander)
Procedure :
1. Short-circuit SL502 of the video board to GND.
2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turned Power switch on. Press FUNCTION button to select
CD.
4. Set a disc (YEDS-18) and play.
5. Press the PLAY MODE button.
(The sledding servo is turned OFF.)
6. Check the level B of the oscilliscope’s waveform and theA (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 7%
Traverse waveform
0V
level : 500 mV ± 100 mVp-p
A (DC voltage)
Center of the waveform
B
7. Pressthe PLAY MODE button.(The trackingservoand sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 6.
Traverse waveform
0V C (DC
voltage)
Sled servo
OFF Sled servo
ON
Note : A clear RF signal waveform means that the shape “◊” can
be clearly distinguished at the center of the waveform.
RF signal waveform

– 20 –
E-F Balance (Traverse) Check (With remote commander)
oscilloscope
BD board
TP (TE)
TP (VC) +
–
Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Short-circuit SL502 of the video board to GND.
3. Turned Power switch on. Press FUNCTION button to select
CD.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the PLAY MODE button. (The tracking servo and the
sledding servo are turned OFF.)
6. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
Adjustment Location :
[ BD BOARD ] – SIDE A –
TP
(TE)
TP
(FEI)
TP
(FE)
TP
(RF) TP (VC)
0V C (DC
voltage)
Tracking servo
Sled servo
OFF
Tracking servo
Sled servo
ON
0V
level : 1.3 ± 0.6 Vp-p
A (DC voltage)
Center of the waveform
B
7. Press the PLAY MODE button. (The tracking servo and sled-
ding servo are turned ON.) Confirm the C (DC voltage) is almost
equal to theA (DC voltage) is step 7.
Traverse waveform
8. Desolder the short-land (SL502) short-circuited at step 2.