HCD-V919AV is the Amplifier, Video CD
player, Tape Deck and Tuner section in
MHC-V919AV.
This stereo system is equipped with the Dolby Btype noise reduction system and Dolby Pro Logic
Surround decoder*.
* Manufactured under license from Dolby Laboratories Licensing Corporation.
DOLBY , the doub le-D symbol a and “PR O LOGIC”
are trademarks of Dolby Laboratories Licensing Corporation.
9.ELECTRICAL PARTS LIST ..............................114
– 2 –
SECTION 1
SERVICING NOTES
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)
IC505
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.
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.
D502
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 MANU AL 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 radiation 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.
– 3 –
MODEL IDENTIFICATION
– Back Panel –
PART No.
MODELPART No.
Malaysia and Singapore models4-900-722-0π
Chinese model4-900-722-1π
Indonesia model4-900-722-2π
Thai model4-900-722-3π
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 TYPENEW TYPE
C407, 408MOUNTNO MOUNT
IC502M30620MC-302FPM30620MC-305FP
JW421, JW422NO MOUNTMOUNT
IC402MOUNTNO MOUNT
R413, 421, 422MOUNTNO MOUNT
X401MOUNTNO 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 IC402: NEW TYPE
– 4 –
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
e
TURNS OFF
1
Remove the case.
3
pull-out the disc tray.
2
Turn the cam to the
direction of arrow.
NOTE FOR INSTALLATION (ROTARY ENCODER)
BU cam
groove
Note: When attaching the Base unit, Insert th
section A into the groove of BU cam.
section A
Note:When attaching the BU cam,
engage the Rotary encoder
switch as shown in the figure.
– 5 –
LOCATION OF CONTROLS
• Front view
SECTION 2
GENERAL
#¢
#¢
#£
#™
#¡
#º
@ª
@•
123 4576
@£
@™ @¡@¢@∞@§@¶
@º
8
9
0
!¡
!™
!£
!¢
!∞
!§
!¶
!•
!ª
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§ button
7Disc tray
8Decoration
9§ button (Deck B)
0Deck A 9, ( buttons and indicators
!¡Deck B 9, ( buttons and indicators
!™CD ^ button and indicator
!£TUNER, BAND button
!¢PRO LOGIC button and indicator
!∞DSP button and indicator
!§KARAOKE PON/MPX button
!¶GROOVE button and indicator
!•VOLUME knob
!ªPHONES jack
@ºDBFB button
@¡–, 0 button and indicator
@™ENTER/NEXT button and indicator
@£p button
@¢AUTO BPM button and indicator
@∞+, ) button and indicator
@§BEAT, JAM button and indicator
@¶BEAT, SPEED button
@•BEAT, SELECT button
@ªBEAT, ON/OFF button and indicator
#ºP FILE MEMORY button
#¡GEQ CONTROL button
#™FILE SELECT button
#£EFFECT button and indicator
#¢FUNCTION button
#∞§ button (Deck A)
– 6 –
^§
^∞
^¢
^£
^™
^¡
^º
%ª
%•
%¶
%§
%£
#§Display window
#¶PBC OFF indicator
#§
#¶
#•
#ª
$º
$¡
$™
$£
$¢
$∞
$§
%™$ª $• $¶%º%¡%¢%∞
#•PBC indicator
#ªVIDEO CD indicator
$ºPLAY MODE, DOLBY NR,
TUNER MEMORY button
$¡EDIT, DIRECTION button
$™REPEAT, STEREO/MONO button
$£r REC button and indicator
$¢P PAUSE button and indicator
$∞HI-DUB button
$§CD SYNC button
$¶NEXT button
$•PREV button
$ªRETURN button
%ºSELECT button
%¡ACTIVE button
%™JOG dial
%£BEAT LEVEL button
%¢PAD B button
%∞P AD A button
%§MIC 2 jack
%¶MIC 1 jack
%•MIC LEVEL knob
%ªECHO LEVEL knob
^ºDEMO button
^¡DISPLAY button
^™CLOCK/TIMER SET button
^£TIMER/SELECT button
^¢CD LOOP button
^∞CD FLASH button
^§CD NON-STOP button and indicator
– 7 –
• Rear view
!¢
!£
!™
!¡
0
1 2 3
4
5
6
1S VIDEO OUT jack
2SYSTEM SELECT switch
3VIDEO OUT jack
4FM antenna terminal
5AM antenna terminals
6VOLTAGE SELECTOR switch
7SURROUND SPEAKER, CENTER terminals
8SURROUND SPEAKER, REAR terminals
9FRONT SPEAKER terminals
0SUPER WOOFER jack
!¡MD OUT jacks
!™MD IN jacks
!£VIDEO (AUDIO) IN jacks
!¢CD DIGITAL OUT, OPTICAL connector
789
– 8 –
This section is extracted from
instruction manual.
– 9 –
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
LOADING PANEL
4
loading panel
3
two claws
2
Pull-out the disc tray.
1
Turn the cam to the direction
of arrow.
FRONT PANEL
2
screw
(BVTP3 × 10)
5
front panel assembly
4
flat type wire
(CN101)
3
connector
(CN203)
4
flat type wire
(CN106)
4
flat type wire
(CN107)
2
screw
(BVTP3 × 10)
3
connector
(CN752)
1
three screws
(BVTP3 × 8)
– 10 –
CASSETTE MECHANISM DECK
1
two screws
(BVTT2
×
4)
1
two screws
(BVTT2
×
4)
6
three screws
(BVTP2.6
×
8)
6
two screws
(BVTP2.6
×
8)
8
two screws
(BVTP2.6
×
8)
6
screw
(BVTP2.6
×
8)
6
screw
(BVTP2.6
×
8)
9
bracket
7
mechanism deck
2
damper, oil
2
damper, oil
3
Push the cassette lids.
4
Remove the cassette lids.
5
spring
5
spring
)
PANEL BOARD AND CONT-PANEL BOARD
6
5
konb (Jog)
nut
7
konb
(Volume)
8
nut
0
CONT-PANEL board
3
shield
1
ten screws
(BVTP2.6
4
flat type wire
(CN602)
×
8)
9
four screws
(BVTP2.6
1
three screws
(BVTP2.6
2
PANEL board
×
8)
×
8
– 11 –
9
six screws
(BVTP2.6
×
8)
DISC TRAY
(Perform after removing the front panel.)
3
flat type wire (8 core)
4
two claws
2
Pull-out the disc tray.
5
Remove the disc tray.
Note: When installing the Disc tray, pull around the flat type wire to
pass through the claw
claw
A
A
and claw B, as shown in the figure.
claw
B
1
Turn the cam the
direction of arrow.
– 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 p , [ENTER/NEXT], and I/u simulta-
neously.
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 I/u button to turn the set ON.
2. Press [CDLOOP] button and I/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 [DISC1] simul-
taneously.
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. Press I/u button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons p , [ENTER/NEXT], and § simulta-
neously.
4. The Sled Servo mode is selected, if “CD” is blanking on the
fluorescent indicator tube.
5. With the CD in stop status, press ) + button to move the
pick-up to outside track, or – 0 button to inside track.
6. 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 3.
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 MW 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 I/u button to turn the set ON.
2. Select the function “TUNER”, and press [TUNERBAND]
button to select the BAND “MW”.
3. Press I/u button to turn the set OFF.
4. Press [ENTER/NEXT] and I/u buttons simultaneously, and
the display of fluorescent indicator tube changes to “MW 9 k
STEP” or “MW 10 k STEP”, and thus the channel step is
changed over.
[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]
Procedure:
1. Press three buttons p , [ENTER/NEXT], and [DISC2] simul-
taneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press [DISC2] button, and the key check mode is activated.
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 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 man-
ner as step 1, or disconnect the power cord.
– 13 –
[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 display tube.
• When no problems:
Aging continues.
Preparations:
• Set the CD on the DISC 1 tray.
• Insert a commercially available tape for recording (tapes which
contents can be erased, etc.) in decks A and B.
Setting the aging mode:
Press the p button, [ENTER/NEXT] button, and
[DISCSKIP/EX-CHANGE] button together . When the aging mode
is set, the CD roulette work blinks. To exit the mode, press the
I/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 “TAPE A” or
“TAPE B” aging is started from deck A.
If the function is to others aging will not be stated until the function is switched to CD or TAPE.
Aging of CD player (12 minutes)
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 deck A
Aging of deck B
Maximum about 12 minutes
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 OperationTiming of Ending
T APE A AG-1TAPE A REWShutoff
T APE A AG-2TAPE A FWD2 minute playback
TAPE A AG-3TAPE A FF20 seconds or shutoff
T APE A AG-4TAPE A REV2 minutes playback
T APE A AG-5TAPE A REWShutoff
TAPE B AG-1TAPE B REWShutoff
TAPE B AG-2TAPE B FWD2 minute playback
TAPE B AG-3TAPE B FF20 seconds or shutoff
TAPE B AG-4TAPE B REV2 minute playback
TAPE B AG-5TAPE B REWShutoff
– 14 –
[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
mechanism controller (IC502) 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-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.
Procedure:
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)
D502
SL501
[VIDEO board] (Side B)
SL503
CN503
SL502
SL501
SL503
SL502
IC502
IC505
CN501
– 15 –
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
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
ModeTorqu MeterMeter Reading
FWDCQ-102C
FWD
Back Tension(0.02 – 0.08 oz•inch)
REVCQ-102RC
REV
Back Tension(0.02 – 0.08 oz•inch)
FF/REWCQ-201B
FWD tensionCQ-403A
REV tensionCQ-403R
CQ-102C
CQ-102RC
31 to 71 g•cm
(0.43 – 0.98 oz•inch)
2 to 6 g•cm
31 to 71 g•cm
(0.43 – 0.98 oz•inch)
2 to 6 g•cm
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)
DECK SECTION 0 dB=0.775 V
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 RCH.
7. Switches and controls should be set as follows unless otherwise specified.
• Test Tape
TapeSignalUsed for
P-4-A10010 kHz, –10 dBAzimuth Adjustment
WS-48B3 kHz, 0 dBTape Speed Adjustment
P-4-L300315 Hz, 0 dBLevel Adjustment
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
P-4-A100
(10 kHz, –10 dB)
MAIN board
CN301
1
(L-CH)
Pin
Pin
3
(R-CH)
level meter
set
MAIN board
CN301
Pin
2
(GND)
+
–
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.
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
– 16 –
3. Mode: Playback (FWD)
(
)
test tape
P-4-A100
(10 kHz, –10 dB)
set
(pin
waveform of oscilloscope
in phase 45 °90 °135 °180
good
MAIN board
CN301
(pin
1
(pin 2: GND)
3
: R-CH)
: L-CH)
wrong
oscilloscope
H
V
°
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
[HI-DUB] button.
Procedure:
1. Turn the power switch on.
2. Press the p button, [ENTER/NEXT] button and [DISC3] button
simultaneously.
(The “VOLUME” on the fluorescent indicator tube will blink
while in the test mode.)
To exit from the test mode, press the I/u button.
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
frequency counter
+
–
4. Repeat setps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
1
Remove the four claws
2
Window
MAIN board
CN301 (Pin
1
: L-CH)
Pin 3 : R-CH
1. Insert the WS-48B into the deck B.
2. Press the · button on the deck B.
3. Press the [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 ± 180 Hz.
5. Press the [HI-DUB] button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
Playback level Adjustment
DECK A DECK B
Procedure:
Mode: Playback
test tape
P-4-L300
(315 Hz, 0 dB)
set
level meter
+
–
MAIN board
CN301 (Pin
ReverseFoward
(Pin
1
3
: L-CH)
: R-CH)
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:
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: AUDIO board
– 17 –
REC Bias Adjustment DECK B
r
r
Procedure:
INTRODUCTION
When set to the test mode performed in T ape 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.
(After recording, press the – 0 button 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.
3. After press [REC] button, press P button, then recording
r
start.
4. Mode: Record
AF OSC
+
–
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz
attenuator
+–+
50 mV (–23.8 dB)
600
Ω
–
set
blank tape
CN-123
4. Mode: Record
MD/VIDEO (AUDIO) IN
AF OSC
+
–
315 Hz, 50 mV (–23.8 dB)
600
attenuator
+–+
–
Ω
blank tape
CS-123
set
5. Mode: Playback
recorded
portion
set
MAIN board
CN301 (Pin
(Pin
level mete
1
: L-CH)
3
: R-CH)
+
–
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 R V351 (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
5. Mode: Playback
recorded
portion
set
MAIN board
CN301 (Pin
(Pin
level mete
1
: L-CH)
3
: R-CH)
+
–
6. Confirm playback the signal recorded in step 3 become adjustable level as follows.
If these levels do not adjustable level, adjustment the RV341
(L-CH) and RV441 (R-CH) on the AUDIO 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: AUDIO board
REC Level Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in T ape 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.
(After recording, press the – 0 button without stopping will
return to the position where recording was started.)
Adjustment Location:
[MAIN Board] (Component Side)
REC LEVEL
[AUDIO Board] (Component Side)
RV441
RV401
RV301
LR
PB LEVEL
– DECK B –
IC602
RV341
RL
REC BIAS
CN601
RV301
L
IC301
RV351
R
RV311
LR
PB LEVEL
– DECK A –
1 3
CN301
RV411
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.
3. After press [REC] button, press P button, then recording
start.
r
[LEAF SW Board] (Component Side)
TAPE SPEED
(NORMAL) (HIGH)
RV1002
RV1001
– 18 –
CN1001
CD SECTION
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)
level: 1.3 Vp-p
+0.25
–0.20
+
–
BD board
TP (TE)
TP (VC)
oscilloscope
C (DC
voltage)
0 V
Tracking servo
Sled servo
OFF
Tracking servo
Sled servo
ON
Notes:
1. CD block basically constructed to operate without adjustment. Therefore, check each item in order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 MΩ impedance.
4. Clean an object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-Curve Check
Connection:
BD board
TP (FE)
TP (VC)
Procedure:
1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board.
2. Connect between test point TP (FOK) and GND 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. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within
3.0 ± 1.0 Vp-p.
S-curve waveform
oscilloscope
+
–
symmetry
A
within 3.0 ± 1.0 Vp-p
B
RF signal waveform
When observing the eye pattern, set the oscilloscope for A C range
and raise vertical sensitivity.
E-F Balance (Traverse) check
Connection:
Procedure:
1. Short-circuit SL502 of the VIDEO board to GND.
2. Connect oscilloscope to test point TP (TE) on BD board.
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 [PLAYMODE] button.
(The tracking servo and the sledding servo are turned OFF.)
6. Check the level B of the oscilloscope’s waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
A
× 100 = less than ± 22 (%)
B
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure tha t 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
Connection:
oscilloscope
(AC range)
BD board
TP (RF)
TP (VC)
+
–
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
2. Turned power switch on.
3. Put disc (YEDS-18) in and press the fl button.
4. Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape “≈” can be clearly
distinguished at the center of the waveform.
Traverse waveform
Center of the waveform
B
0 V
level: 1.3 ± 0.6 Vp-p
A (DC
voltage)
7. Press the [PLAYMODE] button. (The tracking serv o and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 6.
Traverse waveform
8. Desolder the short-land (SL502) short-circuited at step 1.
– 19 –
Connection Location:
)
[BD Board] (Side A)
CN102
CN101
TP
(FOK)
IC101
TP
(TE)
IC103
TP (RF)
TP (VC
TP
(FE)
– 20 –
VIDEO SECTION
Frequency Adjustment
Connection:
VIDEO board
TP508 (27 MHz)
frequency counter
+
–
Procedure:
1. Connect the frequency counter to TP508 (27 MHz) on VIDEO
board.
2. Turned power switch on.
3. Press the [FUNCTION] button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency
counter reading 27.0 MHz ± 80 Hz at stop status.
7-7. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
LEAF SW board
AUDIO board
CONT-PANEL board
POWER AMP board
TRANSFORMER board
DECORATION board
MIC board
VIDEO board
SURROUND boar
MAIN board
CD-SW board
TUNER(FM/AM
Note on Schematic Diagrams:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
¢
•
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are taken with a VOM (Input
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
• Abbreviation
: internal component.
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.
impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
Voltage variations may be noted due to normal production tolerances.
F: TUNER (FM/AM)
E: PLAYBACK (DECK A)
d: PLAYBACK (DECK B)
G : RECORD
J: CD PLAY (AUDIO)
L : CD PLAY (VIDEO)
c : DIGITAL OUT
N: MIC INPUT
CH: Chinese model.
IA: Indonesia model.
MY: Malaysia model.
SP: Singapore model.
TH: Thai model.
4
W or less unless otherwise
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
•p: parts mounted on the conductor side.
®
•
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B)the pattern face are indicated.
Parts face side:Parts on the parts face side seen from
(Side A)the parts face are indicated.
• Indication of transistor.
: Through hole.
C
Q
B
E
Q
B
CE
These are omitted.
These are omitted.
SENSOR board
CONNECTOR board
MOTOR (TURN) board
PANEL board
BD board
MOTOR (SLIDE) boar
HEADPHONE board
– 35 –
– 36 –
7-8. PRINTED WIRING BOARDS – BD Section – • See page 35 for Circuit Boards Location.
HCD-V919AV
– 37 –
(Page 42)
• Semiconductor
Location
Ref. No. Location
IC101E-4
IC102C-10
IC103E-2
IC104F-9
Q101E-12
Q102C-2
Q103C-2
– 38 –
HCD-V919AV
7-9. SCHEMATIC DIAGRAM – BD Section – • See page 86 for Waveforms. • See page 90 and 91 for IC Block Diagrams.
(Page 43)
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.
• V oltages and w av eforms are dc with respect to ground in
CD play mode.
no mark : CD stop
() : CD play
– 39 –
– 40 –
Loading...
+ 70 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.