Panasonic SA-VK31EE User manual

nAMPLIFIER SECTION
RMS power output
THD 10% both channels driven
1 kHz (Low channel)
75 W per channel (6 Ω)
10 kHz (High channel)
75 W per channel (6 Ω)
Total Bi-Amp power 150 W per channel
Phone jack
Terminal Stereo, 3.5 mm jack
A
ux
Input sensitivity 250 mV
Input Impedance 13.3 kΩ
Mic jack
Sensitivity 0.7 mV, 680 Ω
Terminal Mono, 3.5 mm jack
(2 system)
nFM TUNER SECTION
Frequency range 87.50 - 108.00 MHz (50 kHz steps)
Sensitivity 1.8 µV (IHF)
S/N 26 dB 1.5 µV
A
ntenna terminal(s) 75 Ω(unbalanced)
nAM TUNER SECTION
Frequency range 522 - 1629 kHz (9 kHz steps)
©2004 Panasonic AVC Networks Singapore Pte.
Ltd. (RCB registration number: 197701580H) All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-VK31EE
Colour
(S)... Silver Type
Sensitivity
S/N 20 dB (at 999 kHz) 560 µV/m
nCASSETTE 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
nCD SECTION
CD Stereo System
Specifications
ORDER NO. MD0405248C3

Discs played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) Video CD
(3) CD-R/RW (CD-DA, Video CD, MP3 formatted disc)
(4) MP3
Sampling frequency 44.1 kHz
Decoding 16 bit linear
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)
1 Before Repair and Adjustment 4
2 Protection Circuitry 4
3 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
4 Handling the Lead Solder 5
4.1. About lead free solder (PbF) 5
5 Handling Precautions For Traverse Deck 6
6 Precaution of Laser Diode 7
7 Accessories 8
8 Operation Procedures 9
9 Operation Checks and Main Component Replacement
Procedures 10
9.1. Disassembly of Top Cabinet and Rear Panel 11
9.2. Disassembly of CD Mechanism Unit 13
9.3. Disassembly Main P.C.B., Transformer P.C.B. & MP3
P.C.B. 14
9.4. Disassembly of Panel P.C.B. & Tact Switch P.C.B. 15
9.5. Disassembly of Deck Mechanism Unit & Deck P.C.B. 16
9.6. CD Mechanism Main Component Replacement
Procedures 16
9.7. Disassembly Deck Mechanism 29
9.8. Replacement for the cassette lid ass 馳33
MP3
Bit rate 32 kbps - 320 kbps
Sampling frequency
32kHz,44.1kHz,48kHz
nGENERAL
Power Supply AC 230-240 V, 50 Hz
Power consumption 251 W
Dimensions (WxH xD) 250 x 330 x 358 mm
Mass 7.9 kg
Power consumption in standby mode: 0.85 W
nSYSTEM
SC-VK31 (EE) Music center: SA-VK31 (EE)
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.
9.9. Measure for tape trouble 33
10 Service Position 34
10.1. Checking the Main P.C.B., Power P.C.B. & Transformer
P.C.B. 34
10.2. Checking the Panel P.C.B., Tact Switch P.C.B., Deck
P.C.B. & Deck Mechanism P.C.B. 35
11 Description of Error Code 36
11.1. Abnormality Detection for DECK Mechanism 36
11.2. Abnormality detection for CD/Changer Block 36
11.3. Power Supply Related Error Detection 36
12 Self-Diagnostic Function 37
12.1. Self-diagnostic display 37
12.2. How to enter the Self-Diagnostic Function 37
12.3. Cassette Mechanism Test (For error code H01, H02, H03,
F01) 37
12.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29,
H15) 38
12.5. To clear all Error code 38
12.6. How to get out from Self-Diagnostic function 38
12.7. Power Amplifier Failure (F61) 38
13 CD Test Mode Function 38
13.1. How to set CD test mode 38
CONTENTS
Page Page
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SA-VK31EE

13.2. CD Automatically Adjustment result indication 38
14 Measurements and Adjustments 40
14.1. Cassette Deck Section 40
14.2. Tuner Section 41
14.3. Alignment Points 42
15 Block Diagram 43
16 Schematic Diagram 51
16.1. (A) CD Servo Circuit 52
16.2. (B) Tuner/Main Circuit 54
16.3. (B) Main Circuit 55
16.4. (C) Panel Circuit & (D) Tact Switch Circuit 61
16.5. (E) Deck Circuit & (F) Deck Mechanism Circuit 65
16.6. (G) Power Circuit 67
16.7. (H) Transformer Circuit, (J) CD Detect circuit, (K) Spindle
Position Circuit & (L) CD Loading Circuit 69
16.8. (M) VCD Module Circuit 70
17 Printed Circuit Board 73
17.1. (A) CD Servo P.C.B. (Side A & B) 73
17.2. (B) Main P.C.B. 75
17.3. (C) Panel P.C.B. 77
17.4. (D) Tact Switch P.C.B. 79
17.5. (E) Deck P.C.B. & (F) Deck Mechanism P.C.B. 80
17.6. (G) Power P.C.B. 81
17.7. (H) Transformer P.C.B. 83
17.8. (J) CD Detect P.C.B., (K) Spindle Position P.C.B. & (L) CD
Loading P.C.B. 85
17.9. (M) VCD P.C.B. (Side A & B) 86
18 Wiring Connection Diagram 87
19 Illustration of IC 痴, Transistors and Diodes 89
20 Terminal Function of IC 痴90
20.1. IC7001 (AN22004A-NF) Servo Amplifier 90
20.2. IC7002 (MN662790RSC) Servo Processor/ Digital Signal
Processor/ Digital Filter/ D/A Converter 90
20.3. IC7003 (AN8739SBTE2) Focus Coil/ Tracking Coil/
Traverse Motor/ Spindle Motor Driver 91
20.4. IC2801 (MN101C30AEB) Mechacon IC 91
20.5. IC600 (C2BBGF000579) Microprocessor 92
21 Troubleshooting Guide 93
22 Parts Location and Replacement Parts List 94
22.1. Deck Mechanism (RAA3412-S) 95
22.2. CD Loading Mechanism (RD-DAC026-S) 98
22.3. Cabinet 101
22.4. Electrical Parts List 104
22.5. Packing Materials & Accessories Parts List 114
22.6. Packaging 115
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SA-VK31EE

1 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 230V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~650mA.
2 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-VK31EE

3 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 the assembly 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).
4 Handling the Lead Solder
4.1. 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-VK31EE

5 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-VK31EE

6 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.
nUse of Caution Labels
7
SA-VK31EE

7 Accessories
AC power supply cord
FM indoor antenna
AM loop antenna
Video connection cable
Remote control
transmitter
8
SA-VK31EE

8 Operation Procedures
9
SA-VK31EE

Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
9 Operation Checks and Main Component Replacement
Procedures
“ATTENTION SERVICER”
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.
10
SA-VK31EE

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.
· Disassembly of Rear Panel
Step 3 Remove 7 screws and disconnect wire at CN305 (Fan)
at rear cabinet as shown.
9.1.1. Disasembly for CD Lid
(The CD changer unit can be removed after the CD Lid is
removed)
· Follow the (Step 1) - (Step 2) of Item 9.1 - 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 POWER button to power up the main unit.
Step 3 Press the OPEN/CLOSE button, the disc tray will be
open automatically.
9.1. Disassembly of Top Cabinet and Rear Panel
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SA-VK31EE

Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the POWER button to turn the power on.
Step 6 Press the OPEN/CLOSE button, the disc tray will be
close.
[Open the disc tray manually (Using service tools)]
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-VK31EE

Step 1 Detach the FFC boards (CN309 & CN310).
Step 2 Release the claws of both ends, and then lift up the 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.
Step 3 Remove 4 screws.
Step 4 Remove the CD chassis.
Step 5 Lay the CD mechanism unit as shown.
· Note:
For disassembly of CD mechanism unit, please refer to
Section 9.6 of this manual.
9.2. Disassembly of CD Mechanism Unit
· Follow the (Step 1) - (Step 3) of Item 9.1 - Disassembly of Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly for CD Lid
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SA-VK31EE

9.3.1. Disassembly for the Main P.C.B.
· Follow the (Step 1) - (Step 3) of Item 9.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.2 - Disassembly for
the CD Mechanism Unit
Step 1 Disconnect FFC at CN2902, CN2903 & CN2904 from
Panel P.C.B.
Step 2 Lift up Main P.C.B. by disconnect CN500 & CN501 as
arrow shown above.
9.3.2. Disassembly of the Transformer
P.C.B.
· Follow the (Step 1) - (Step 3) of Item 9.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.2 - Disassembly for
the CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 9.3.1 - Disassembly
for the Main P.C.B.
Step1 Remove 3 screws, disconnect connector CN951.
9.3.3. Disassembly of the Power P.C.B.
· Follow the (Step 1) - (Step 2) of Item 9.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.2 - Disassembly of
the CD Mechanism Unit
· Follow the (Step 1) - (Step 2) of Item 9.3.1 - Disassembly
for the Main P.C.B.
· Follow the (Step 1) of Item 9.3.2 - 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.
9.3. Disassembly Main P.C.B., Transformer P.C.B. & MP3 P.C.B.
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SA-VK31EE

Step 1 Break the joint with a metal cutter as shown below.
· Follow the (Step 1) - (Step 6) of Item 9.1.
· Follow the (Step 1) - (Step 6) Disassembly for the CD Lid of
Item 9.1.1.
· Follow the (Step 1) - (Step 6) Disassembly for the CD
Changer Unit of Item 9.1.2.
Step 1 Lay the unit 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.
Step 2 Remove 2 screws, release 2 claws, and then draw the
front panel ass’y forward.
Step 3 Remove the 8 screws.
9.4. Disassembly of Panel P.C.B. & Tact Switch P.C.B.
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SA-VK31EE

Step 4 Disconnect FFC Boards (CN951, CN2903, CN2902 &
CN2904).
· Disassembly of Tact Switch P.C.B.
Step 5 Disconnect connector CP600.
· Follow the (Step 1) - (Step 3) of Item 9.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.2 - 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.
· Follow the (Step 1) - (Step 3) of Item 9.1 - Disassembly of
Top Cabinet and Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.1.1 - Disassembly
for CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.2 - Disassembly for
the CD Mechanism Unit
Step 6 Pull out the volume knob.
Step 7 Pull Panel P.C.B. forward.
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.
9.6.1. Replacement of the Traverse Deck
Step 1 Remove the CD changer unit.
9.5. Disassembly of Deck Mechanism Unit & Deck P.C.B.
9.6. CD Mechanism Main Component Replacement Procedures
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SA-VK31EE

Step 2 Insert the gear with hexagonal wrench into the hole.
Step 3 Rotate the hexagonal wrench in the direction of arrow
(clockwise), and then open the disc tray fully.
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 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-VK31EE

Step 10 Remove the FFC board from the connector, and then
remove the CD Servo P.C.B.
Step 11 Remove the pin.
Step 12 Release the claw, and then remove the traverse deck
ass’y.
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.
· Note for installation of the CD servo P.C.B.
· Installation for traverse deck ass’y
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SA-VK31EE

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).
9.6.2. 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-VK31EE

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 7 Rotate the hexagonal wrench in the direction of arrow,
and then open the disc tray fully.
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 1 Slide the drive rack fully in the direction of arrow.
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SA-VK31EE