SA-VK31GC
A
A
CD Stereo System
SA-VK31GC
SA-VK31GS
Colour
(S)... Silver Type
ORDER NO. MD0405174C3
Specifications
n AMPLIFIER SECTION
PMPO 2500 W
RMS power output
THD 10% both channels driven
1 kHz (Low channel) 75 W per channel (6 Ω)
10kHz (High channel) 75 W per channel (6 Ω)
Total Bi-Amp power 150 W per channel
UX
Input sensitivity 250 mV
Input Impedance 13.3 kΩ
Phone jack
Terminal Stereo, 3.5 mm jack
MIC jack
Sensitivity 0.7 mV, 680 Ω
Terminal Mono, 3.5 mm jack (2 system)
n FM TUNER SECTION
Frequency range 87.50 - 108.00 MHz (50 kHz steps)
Sensitivity 2.5µV (IHF)
S/N 26 dB 2.2 µV
ntenna terminal(s) 75 Ω (unbalanced)
n AM TUNER SECTION
Frequency range 522 - 1629 kHz (9 kHz steps)
520 - 1630 kHz (10 kHz steps)
Sensitivity
S/N 20 dB (at 999 kHz) 560 µV/m
n CASSETTE DECK SECTION
Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
S/N 50 dB (A weighted)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time Approx. 120 seconds with
C-60 cassette tape
n CD SECTION
Discs played [8 cm or 12 cm]
(1) CD- Audio (CD-DA)
(2) Video CD
(3) CD-R/RW (CD-DA, MP3 disc)
(4) MP3
Sampling frequency 44.1 kHz
Decoding 16 bit linear
© 2004 Panasonic AVC Networks Singapore Pte.
Ltd. (RCB registration number: 197701580H) All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-VK31GC / SA-VK31GS
Pickup
Beam source/wavelength Semiconductor laser/780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1, -2 dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)
Video
Video signal system PAL625/50, PAL525/60, NTSC
Output level Composite video, 1 Vp-p, 75 Ω
Terminal Pinjack(1system)
MP3
Bit rate 32 kbps-320 kbps
Sampling frequency 32 kHz, 44.1 kHz, 48kHz
n GENERAL
Power Supply AC 110 V/127 V/220-230 V/240 V,
50/60Hz
Power consumption 251 W
Dimensions (W x H x D) 250 x 330 x 358 mm
Mass 7.9kg
Power consumption in standby mode: 0.85 W
n SYSTEM
SC-VK31 (GC) Music center: SA-VK31 (GC)
Front speaker: SB-VK31 (GC)
SC-VK31 (GS) Music center: SA-VK31 (GS)
Front speaker: SB-VK31 (GC)
Note:
1. Specifications are subject to change without notice. Mass and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
3. HIGH stands for High Frequency. LOW stands for Low
Frequency.
CONTENTS
Page Page
1 Safety precautions (for GS only)
2 Before Use (For GC Only)
3 Before Repair and Adjustment
4 Protection Circuitry
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
6 Handling the Lead Solder
6.1. About lead free solder (PbF)
7 Handling Precautions For Traverse Deck
8 Precaution of Laser Diode
9 Accessories
10 Operation Procedures
11 Operation Checks and Main Component Replaceme nt
Procedures
11.1. Disassembly of Top Cabinet and Rear Panel
11.2. Disassembly of CD Mechanism Unit
11.3. Disassembly Main P.C.B., Transformer P.C.B. & MP3
P.C.B.
11.4. Disassembly of Panel P.C.B. & Tact Switch P.C.B.
11.5. Disassembly of Deck Mechanism Unit & Deck P.C.B.
11.6. CD Mechanism Main Component Replacement
Procedures
11.7. Disassembly Deck Mechanism
11.8. Replacement for the cassette lid ass 馳
11.9. Measure for tape trouble
12 Service Position
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12.1. Checking the Main P.C.B., Power P.C.B., Transformer
P.C.B. and Voltage Selector P.C.B.
12.2. Checking the Panel P.C.B., Tact Switch P.C.B., Deck
P.C.B. & Deck Mechanism P.C.B.
13 Descriptio n of Error Code
13.1. Abnormality Detection for DECK Mechanism
13.2. Abnormality detection for CD/Changer Block
13.3. Power Supply Related Error Detection
14 Self-Diagn ostic Function
14.1. Self-diagnostic display
14.2. How to enter the Self-Diagnostic Function
14.3. Cassette Mechanism Test (For error code H01, H02, H03,
F01)
14.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29,
H15)
14.5. To clear all Error code
14.6. How to get out from Self-Diagnostic function
14.7. Power Amplifier Failure (F61)
15 CD Test Mode Function
15.1. How to set CD test mode
15.2. CD Automatically Adjustment result indication
16 Measurem ents and Adjustments
16.1. Cassette Deck Section
16.2. Tuner Section
16.3. Alignment Points
17 Block Diagram
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SA-VK31GC / SA-VK31GS
18 Schematic Diagram 52
18.1. (A) CD Servo Circuit
18.2. (B) Tuner/Main Circuit
18.3. (B) Main Circuit
18.4. (C) Panel Circuit & (D) Tact Switch Circuit
18.5. (E) Deck Circuit & (F) Deck Mechanism Circuit
18.6. (G) Power Circuit
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18.7. (H) Transformer Circuit, (I) Voltage Selector Circuit, (J) CD
Detect circuit, (K) Spindle Position Circuit & (L) CD
Loading Circuit
18.8. (M) VCD Module Circuit
19 Printed Circuit Board
19.1. (A) CD Servo P.C.B. (Side A & B)
19.2. (B) Main P.C.B.
19.3. (C) Panel P.C.B.
19.4. (D) Tact Switch P.C.B.
19.5. (E) Deck P.C.B. & (F) Deck Mechanism P.C.B.
19.6. (G) Power P.C.B.
19.7. (H) Transformer P.C.B. & (I) Voltage Selector P.C.B.
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19.8. (J) CD Detect P.C.B., (K) Spindle Position P.C.B., (L) CD
Loading P.C.B. & (N) Tuner Pack P.C.B.
86
19.9. (M) VCD P.C.B. (Side A & B)
20 Wiring Connection Diagram
21 Illustration of IC 痴, Transistors and Diodes
22 Terminal Function of IC 痴
22.1. IC7001 (AN22004A-NF) Servo Amplifier
22.2. IC7002 (MN662790RSC) Servo Processor/ Digital Signal
Processor/ Digital Filter/ D/A Converter
22.3. IC7003 (AN8739SBTE2) Focus Coil/ Tracking Coil/
Traverse Motor/ Spindle Motor Driver
22.4. IC2801 (MN101C30AEA) Mechacon IC
22.5. IC600 (C2BBGF000511) Microprocessor
23 Troubleshooting Guide
24 Parts Location and Replacement Parts List
24.1. Deck Mechanism (RAA3412-S)
24.2. CD Loading Mechanism (RD-DAC026-S)
24.3. Cabinet
24.4. Electrical Parts List
24.5. Packing Materials & Accessories Parts List
24.6. Packaging
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SA-VK31GC / SA-VK31GS
1 Safety precautions (for GS only)
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SA-VK31GC / SA-VK31GS
2 Before Use (For GC Only)
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 117V or 120V, set to the “127V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
3 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C950, C5820 and C5820 through a 10Ω, 5W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 110V, 50/60 Hz and AC 240V, 50 Hz in NO SIGNAL mode should be ~650mA and ~600mA
respectively.
4 Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
No sound is heard when the power is turned on.
·
Sound stops during a performance.
·
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
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SA-VK31GC / SA-VK31GS
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equiped with ES devices, place theassembly on a conductive surface such as aluminium
foil, to prevent electrostatic charge build up or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or
comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD)
sufficient to damage an ES device).
6 Handling the Lead Solder
6.1. About lead free solder (PbF)
Distinction of PbF P.C.B. :
P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.
Caution:
· Pb free solder has a higher melting point that standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher.
Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F
(370 ± 10°C).
· Pb free solder will tend to splash when heated too high (about 1100°F/600°C).
· When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
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SA-VK31GC / SA-VK31GS
7 Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
· Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.
2. The short land between the No.4(LD) and No.5(GND) pins on the flexible board (FFC) is shorted with a solder build-up to
prevent damage to the laser diode.To connect to the PC board, be sure to open by removing the solder build-up, and finishthe
work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
· Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity from your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground
the sheet.
Caution :
The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the
traverse deck (optical pickup).
Caution when Replacing the Traverse Deck :
The traverse deck has a short point shorted with solder to protect the laer diode against electroststics breakdown. Be sure to
remove the solder from the short point before making connections.
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SA-VK31GC / SA-VK31GS
8 Precaution of Laser Diode
Caution :
This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens.
Wavelength : 780 nm
Maximum output radiation power from pick up : 100 µW/VDE
Laser radiation from pick up unit is safety level, but be sure the followings:
1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Do not look at pick up lens.
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
n Use of Caution Labels
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9 Accessories
SA-VK31GC / SA-VK31GS
AC power supply cord
(For GC only)
AC power supply cord
(For GS only)
FM indoor antenna
AM loop antenna
Video connection cable
Remote control
transmitter
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SA-VK31GC / SA-VK31GS
10 Operation Procedures
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SA-VK31GC / SA-VK31GS
11 Operation Checks and Main Component Replacement
Procedures
“ATTENTION SERVICER”
Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the
main components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
Warning:
This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.
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SA-VK31GC / SA-VK31GS
11.1. Disassembly of Top Cabinet and Rear Panel
Step 1 Remove 3 screws each side and 5 screws at rear panel.
Step 2 Lift up both sides of cabinet ass’y, push the cabinet
ass’y toward the rear and remove the cabinet ass’y.
11.1.1. Disasembly for CD Lid
· Disassembly of Rear Panel
Step 3 Remove 8 screws and disconnect wire at CN305 (Fan)
at rear cabinet as shown.
(The CD changer unit can be removed after the CD Lid is
removed)
· Follow the (Step 1) - (Step 2) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
When opening the disc tray automatically (Using Power
Supply)
Step 1 Connect the AC power cord.
Step 2 Press the POWE R button to power up the main unit.
Step 3 Press the OPEN/CLOSE button, the disc tray will be
open automatically.
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Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the POWE R button to turn the power on.
SA-VK31GC / SA-VK31GS
[Open the disc tray manually (Using service tools)]
Step 6 Press the OPEN/CLOSE button, the disc tray will be
close.
Step 1 Insert the gear tool into the hole on the underside of CD
chassis and then rotate in the direction of arrow. The disc tray
will be open.
Step 2 Release the 2 claws, and then remove the CD lid cover.
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SA-VK31GC / SA-VK31GS
11.2. Disassembly of CD Mechanism Unit
Step 3 Repeat Step 2 but rotate the gear tools in anti-clockwise
direction.
Step 4 The disc tray will be close.
· Follow the (Step 1) - (Step 3) of Item 11.1 - Disassembly of Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly for CD Lid
Step 1 Detach the FFC boards (CN309 & CN310).
Step 3 Remove 4 screws.
Step 4 Remove the CD chassis.
Step 5 Lay the CD mechanism unit as shown.
· Note:
Step 2 Release the claws of both ends, and then lift up the CD
Mechanism Unit.
For disassembly of CD mechanism unit, please refer to
Section 11.6 of this manual.
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11.3. Disassembly Main P.C.B., Transformer P.C.B. & MP3 P.C.B.
11.3.1. Disassembly for the Main P.C.B.
· Follow the (Step 1) - (Step 3) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 11.2 - Disassembly for
the CD Mechanism Unit
Step 1 Disconnect FFC at CN2902, CN2903 & CN2904 from
Panel P.C.B.
11.3.3. Disassembly of the Power P.C.B.
SA-VK31GC / SA-VK31GS
Step 2 Lift up Main P.C.B. by disconnect CN500 & CN501 as
arrow shown above.
11.3.2. Disassembly of the Transformer
P.C.B. & Voltage Selector P.C.B.
· Follow the (Step 1) - (Step 3) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 11.2 - Disassembly for
the CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 11.3.1 - Disassembly
for the Main P.C.B.
Step1 Remove 3 screws, disconnect connector CN951.
· Follow the (Step 1) - (Step 2) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 11.2 - Disassembly of
the CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 11.3.1 - Disassembly
for the Main P.C.B.
· Follow the (Step 1) of Item 11.3.2 - Disassembly for the
Transformer P.C.B.
Step 1 Remove 2 screws fixed to the Main P.C.B.
Step 2 Remove the 2 screws fixed at heat sink.
NOTE:
Insulate Power P.C.B. with insulation material to avoid short
circuit.
· Replacement of Power Amplifier IC & Voltage Regulator
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SA-VK31GC / SA-VK31GS
Step 1 Break the joint with a metal cutter as shown below.
Step 2 Unsolder the terminals of Power Amp IC, transistor and
replace the components.
Step 3 Fix back the cutted portion with a screw as shown.
11.4. Disassembly of Panel P.C.B. & Tact Switch P.C.B.
· Follow the (Step 1) - (Step 6) of Item 11.1.
· Follow the (Step 1) - (Step 6) Disassembly for the CD Lid of
Item 11.1.1.
· Follow the (Step 1) - (Step 6) Disassembly for the CD
Changer Unit of Item 11.1.2.
Step 1 Lay the unit as shown below.
Step 3 Remove the 8 screws.
Step 4 Disconnect FFC Boards (CN951, CN2903, CN2902 &
Step 2 Remove 2 screws, release 2 claws, and then draw the
front panel ass’y forward.
CN2904).
· Disassembly of Tact Switch P.C.B.
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SA-VK31GC / SA-VK31GS
Step 5 Disconnect connector CP600.
Step 6 Pull out the volume knob.
Step 7 Pull Panel P.C.B. forward.
11.5. Disassembly of Deck Mechanism Unit & Deck P.C.B.
· Follow the (Step 1) - (Step 3) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 11.2 - Disassembly for
the CD Mechanism Unit
Step 1 Detach FFC board. (CN951, CN2902, CN2903 &
CN2904)
Step 2 Disconnect FFC flat cable from the connector
(CN2903).
Step 3 Remove the 5 screws.
Step 4 Push the lever upward, and then open the cassette lid
ass’y (For DECK1 and DECK2).
Step 5 Tilt the cassette mechanism unit in the direction of
arrow (1), and then remove it in the direction of arrow (2).
· For replacement of Deck P.C.B.
Step 6 Unsolder the motor terminals.
Step 7 Remove 4 screws.
Step 8 Remove Deck P.C.B.
11.6. CD Mechanism Main Component Replacement Procedures
· Follow the (Step 1) - (Step 3) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 11.2 - Disassembly for
the CD Mechanism Unit
11.6.1. Replacement of the Traverse Deck
Step 1 Remove the CD changer unit.
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SA-VK31GC / SA-VK31GS
Step 2 Insert the gear with hexagonal wrench into the hole.
Step 4 With pressing the claw (A), rotate the hexagonal wrench
clockwise. (The slide plate R moves for a little amount.)
Step 5 Pressing the claw (B) in the direction of arrow (1), the
connection lever moves in the direction of arrow (2).
Step 6 Lift up the traverse deck ass’y.
Step 3 Rotate the hexagonal wrench in the direction of arrow
(clockwise), and then open the disc tray fully.
Step 7 Remove the traverse deck ass’y from the timing lever.
Caution:
When removing or inserting the traverse deck avoid touching
the OPU lens and pressing onto the turntable.
Step 8 Remove 3 screws.
Step 9 Unsolder the motor terminals (4 points).
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SA-VK31GC / SA-VK31GS
Note:
Be careful not to lose the 3 floating spring because those will
also be removed on removal of the traverse deck ass’y.
· Installation of the CD Servo P.C.B. after replacement
Step 1 Connect the FFC board.
Step 2 Install the CD servo P.C.B. in the traverse deck ass’y.
Step 3 Remove 3 screws.
Step 4 Solder.
Step 10 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.
Step 11 Remove the pin.
· Note for installation of the CD servo P.C.B.
· Installation for traverse deck ass’y
Step 12 Release the claw, and then remove the traverse deck
ass’y.
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SA-VK31GC / SA-VK31GS
Step 1 Install the traverse deck ass’y to the timing lever.
Step 2 Align the boss of traverse deck ass’y with the slot of
traverse cam gear.
Step 3 Force the claw of timing lever.
Step 4 Force the disc tray fully.
Step 5 With pressing the claw (B) in the direction of arrow (1),
force the connection lever in the direction of arrow (2).
11.6.2. Replacement for the Disc Tray
Step 1 Remove 4 screws.
Step 2 Remove the upper plate.
Step 3 Remove 3 screws.
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SA-VK31GC / SA-VK31GS
Step 4 With lifting the claw in the direction of (1), draw the CD
Detect P.C.B. in the direction of arrow (2).
Step 5 Remove the mechanism cover.
Step 6 Insert the gear with hexagonal wrench into the hole.
Step 8 Release the both claws, and then draw the disc tray.
Step 9 With forcing the left guide bar manually because the left
guide bar interfers with claw, draw the disc tray.
[Installation of the disc tray after replacement]
Step 7 Rotate the hexagonal wrench in the direction of arrow,
and then open the disc tray fully.
Step 1 Slide the drive rack fully in the direction of arrow.
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SA-VK31GC / SA-VK31GS
11.6.3. Disassembly and reassembly for
mechanism base drive unit
Step 1 Remove 3 screws.
Step 2 Holding the drive rack not to move, install the disc tray.
Step 3 Align the drive rack with the drive gear.
NOTE:
Force the right guide bar of tray base manually not to move
upwards.
Step 2 Release the claw, and then remove the gear holder.
Step 3 Remove the belt and change gear spring.
NOTE:
Take care not to lose the change gear spring.
Step 4 Remove the pulley gear, change gear and UP/DOWN
gear.
Step 4 Holding the disc tray manually, push the disc tray in the
direction of the arrow.
Step 5 Release the 2 claws, and then remove the bottom SW
P.C.B..
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SA-VK31GC / SA-VK31GS
Step 6 Install the tray lock spring to hook temporary.
Step 7 Release the claw, and then remove the tray lock.
Step 8 Release the claw, and then remove the rear lock.
Step 9 Pressing the claw (B) in the direction of arrow (1), force
the connection lever in the direction of arrow (2).
Step 10 Move the slide plate 1 to the end of stock side.
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SA-VK31GC / SA-VK31GS
Step 11 Lift up the left end of spindle base unit in the direction
of arrow (1), and then remove the unit in the direction of arrow
(2).
Step 13 Remove the traverse relay gear, traverse cam gear
and drive gear.
Step 12 Remove slide plate 1 and slide plate 2.
[Dissassembly/reassembly for the spindle base unit]
Step 1 Draw the 5 disc spacers.
Step 2 Pushing the claw, slide the support plate in the direction
of arrow, and then remove it.
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Step 3 Rotate the disc lever in the direction of arrow (1), draw
the disc lever.
SA-VK31GC / SA-VK31GS
NOTE:
Hold the loading stopper ass’y manually bacause it is flipped by
spring.
NOTE:
Take care not to lose the disc lever spring.
Step 4 Release the 2 claws, and then draw the relay gear B.
Step 5 Release the 2 claws as shown below.
Step 6 Remove the cushion spring.
Step 7 Remove the loading stopper ass’y in the direction of
arrow.
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SA-VK31GC / SA-VK31GS
Step 8 Release the 2 claws, and then remove the relay gear A.
Step 9 Release the 2 claws, and then remove the spindle shaft.
Step 10 Remove the lower spindle spring with tweezers.
Step 11 Force the lower hook with thin tip of minus screwdriver.
Step 12 Squeeze the shaft of lower hook, and then draw it.
Step 13 Rotate the lower spindle in the direction of arrow until
the lower spindle interferes with stopper.
Step 14 Insert the thin tip of minus screwdriver between the
lower spindle and UP/DOWN base, and then slacken the lower
spindle to release the stopper. Then, rotate the lower spindle
and remove it.
Step 15 Rotate the UP/DOWN base at a 90° angle. Then,
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SA-VK31GC / SA-VK31GS
spread the hold bars of loading stopper and remove the
UP/DOWN base.
[Installation for loading stopper ass’y]
Step 1 Align the claw of loading stoppers ass’y with the slot of
spindle base. (Caution should be exercised when alignment of
claw due to the size of claws.)
Step 2 Lower the loading stopper ass’y, and then align the
lower spindle with the trapezoid tooth of relay gear A.
Step 1 Install the traverse cam gear.
Step 2 Rotate the traverse cam gear to the direction of arrow.
Step 3 Install the drive gear and traverse relay gear.
Step 3 Force the loading stopper ass’y, latch the claw firmly.
[Reassembly for mechanism base drive unit]
*When installing the traverse relay gear, align the trapezoid
tooth of gear with tooth of traverse cam gear.
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SA-VK31GC / SA-VK31GS
Step 4 Install the slide plate 2 to the mechanism base, and
then match to the connection lever.
Step 5 Install the slide plate 1 to the mechanism base, and
then match to the connection leve and align the trapezoid tooth
of traverse relay gear with the slide plate 1.
Step 6 Install the spindle base unit. (First, slide plate 1.)
Step 7 Move the slide plate 1 to forward fully.
Step 8 Install the rear lock. (The claw should be latched.)
Step 9 Install the Spindle Position P.C.B.. (The claw should be
latched.)
Step 10 Install the tray lock. (The claw should be latched.)
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SA-VK31GC / SA-VK31GS
Step 14 Install the tray base, traverse ass’y, mechanism cover
and upper plate.
[Operation check after servicing]
Check the proper operation of following items with gear and
hexagonal screwdriver.
1. Open/close of tray base.
2. Moving the tray base to the stock side.
3. UP/DOWN operation of spindle base unit.
4. UP/DOWN operation of traverse ass’y.
Step 11 Remove the tray lock spring from hook,and then latch
to the tray lock.
Step 12 Install the UP/DOWN gear, change gear, change gear
spring, pulley gear and belt in the order of (1) - (5).
11.6.4. Replacement for the motor ass’y
Step 1 Install the belt temporarily.
NOTE:
Take care not apply the grease to the belt.
Step 2 Upset the CD loading unit.
Step 3 Remove 3 screws.
Step 13 Install the gear holder, and then tighten the screw (a).
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SA-VK31GC / SA-VK31GS
Step 4 Unsolder the plunger terminals (2 points).
Step 5 Unsolder the motor terminals (2 points).
11.7. Disassembly Deck Mechanism
11.7.1. Replacement for the pinch roller
ass’y and head block
· Follow the (Step 1) - (Step 2) of Item 11.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 11.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 2) of Item 11.2 - Disassembly for
the CD Mechanism Unit
· Follow the (Step 1) of Item 11.3 - Disassembly for the Main
P.C.B. & Transformer P.C.B.
· Follow the (Step 1) - (Step 2) of Item 11.4 - Disassembly for
the Panel P.C.B. & Tact Switch P.C.B.
· Follow the (Step 1) - (Step 5) of Item 11.5 - Disassembly for
the Deck Mechanism Unit & Deck P.C.B.
* The mechanism as shown below is for DECK1. For the
one of DECK 2, perform the same procedures.
Step 6 Release the 2 claws (A), and then remove the Motor
P.C.B.
Step 7 Release the claw (B), and then remove the motor ass’y.
[Notice for motor ass’y installation]
1. Locate the name plate of motor to the traverse ass’y.
2. Align the hole of motor with the ribs.
Step 1 Release the 2 claws, and then remove the pinch roller
(R), (F).
Step 2 Release ther 2 claws, and then remove the head
connector.
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