Panasonic SA-AK310GC User manual

Service Manual
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ORDER NO. MD0212275C3
CD Stereo System
 SA-AK310GC
SA-AK310GN
Colour
(S)... Silver Type
TAPE SECTION :
SG-2W MECHANISM SERIES
Specifications
AMPLIFIER SECTION
Power output
10% Total harmonic distortion
1kHz, both channels driven
(Low channel) 55 W per channel (6Ω)
10kHz, both channels driven
(High channel) 55 W per channel (6Ω)
Total Bi-Amp power 110 W per channel
Input sensitivity
AUX 250 mV
Input Impedance
AUX 13.3 kΩ
FM TUNER SECTION
Frequency range 87.50 - 108.00 MHz (50 kHz steps)
Sensitivity 2.5µV (IHF)
S/ N 26 dB 2.2µV
Antenna terminal(s) 75Ω(unbalanced)
AM TUNER SECTION
Frequency range 522 - 1629 kHz (9 kHz steps)
520 - 1630 kHz (10 kHz steps)

© 2002 Matsushita Electronics (S) Pte. Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.
Sensitivity
S/ N 20 dB (at 999 kHz) 560µV/ m
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 (1 7/ 8 ips)
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
CD SECTION
Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source/ wave length 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 8 fs
D/ A converter MASH (1 bit DAC)
GENERAL
Power Supply
For GC only AC 110/ 127/ 220-230/ 240 V, 50/ 60Hz
For GN only AC 230-240 V, 50Hz
Power consumption
For GC only 172 W
For GN only 170 W
Power Consumption in standby mode
For GC only 0.85 W
For GN only 0.5 W
Dimensions (W x H x D) 250 x 330 x 370 mm
Mass
For GC only 7.8 kg
For GN only 7.0 kg
SYSTEM
SC-AK310 (GC) Music center: SA-AK310 (GC)
Speaker: SB-AK310 (GC)
SC-AK310 (GN) Music center: SA-AK310 (GN)
Speaker: SB-AK310 (GC)
Notes:
1. Specifications are subject to change without notice. Mass and dimensions are aproximate.
2. Total harmonic distortion is measured by the digital spectrum analyzer.
3. The labels“ HIGH” and“ LOW” on the rear of the speakers refer to High frequency and Low frequency.

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1 Before Use
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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.)
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2 Before Repair and Adjustment
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Disconnect AC power, discharge Power Supply Capacitors C520 and C540 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.
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3 Protection Circuitry
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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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4 Accessories
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Remote control transmitter
FM indoor antenna
AC power supply cord (For GC only)
AC power supply cord (For GN only)
AM Loop antenna
Power plug adaptor
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5 Operation Procedures
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6 Handling Precautions For Traverse Deck
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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 workquickly.
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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7 Operation Checks and Component
Replacement Procedures
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“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.
7.1 Checking for Main P.C.B.
7.2 Disassembly for the CD changer ass ’ y
7.2.1 Disassembly for the CD Lid
7.2.2 Disassembly for CD changer unit
7.3 Checking for the unit operational condition
7.3.1 Initial setting of CD
7.3.2 Checking for the CD Servo P.C.B., Panel P.C.B., Deck P.C.B., Transformer P.C.B. and
Power P.C.B.
7.3.3 Replacement of the Power Amplifier IC
7.4 Main Component Replacement Procedures

7.4.1 Replacement of the Traverse Deck
7.5 Replacement for the disc tray
7.6 Disassembly and reassembly for mechanism base drive unit
7.7 Replacement for the motor ass ’ y
7.8 Replacement for the pinch roller ass ’ y and head block
7.9 Replacement for the Deck motor ass ’ y, capstan belt A, capstan belt B and winding belt
7.10 Replacement for the CD motor ass ’ y, capstan belt A, capstan belt B and winding belt
7.11 Replacement for the cassette lid ass ’ y
7.12 Measure for tape trouble
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7.1 Checking for Main P.C.B.
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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.
 Checking the Main P.C.B. as shown below.
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7.2 Disassembly for the CD changer ass
’
y
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(The CD changer unit can be removed after the CD Lid is removed)
7.2.1 Disassembly for the CD Lid
7.2.2 Disassembly for CD changer unit
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7.2.1 Disassembly for the CD Lid
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 Follow the (Step 1) - (Step 2) of Item 7.1.
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.
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 Upset the unit as shown below.
Step 2
Insert the gear tool into the hole on the underside of CD chasis and then rotate in the direction
of arrow. The disc tray will be open.
Step 3 Release the 2 claws, and then remove the CD lid cover.
Step 4 Push the disc tray.
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7.2.2 Disassembly for CD changer unit
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 Follow the (Step 1) - (Step 2) of Item 7.1.
 Follow the Disassembly for the CD Lid of Item 7.2.1.
Step 1 Remove 2 screws at rear cabinet as show below.
Step 2 Lift up the mechanism unit cover, and then push in the mechanism unit cover.
Step 3 Release the claws of both ends, and then lift up the CD changer unit.
Step 4 Upset the CD changer unit.
Step 5 Place the CD changer unit on the unit.
<The preparation of checking procedures in operational condition is completed>
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7.3 Checking for the unit operational condition
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(Place the unit horizontally when loading the CD changer unit.)
7.3.1 Initial setting of CD
7.3.2 Checking for the CD Servo P.C.B., Panel P.C.B., Deck P.C.B., Transformer P.C.B. and Power
P.C.B.
7.3.3 Replacement of the Power Amplifier IC
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7.3.1 Initial setting of CD
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 Follow the (Step 1) - (Step 2) of Item 7.1.
 Follow the Disassembly for the CD Lid of Item 7.2.1.
Step 1 Connect the AC power cord.
Step 2 Press POWER button to turn on power for main unit.
Step 3 Select the input select button to “CD”.
Step 4 Push the OPEN/CLOSE button, and then open the disc tray.
Step 5 Put the CD into the disc tray.
Step 6 Press the OPEN/CLOSE button 1, and then close the disc tray. (Then, the CD will load.)
<The initial setting of CD unit is completed.>
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7.3.2 Checking for the CD Servo P.C.B., Panel
P.C.B., Deck P.C.B., Transformer P.C.B. and
Power P.C.B.
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 Follow the (Step 1) - (Step 2) of Item 7.1.
 Follow the Disassembly for the CD Lid of Item 7.2.1.
 The initial setting of CD unit must be completed. (Refer to the initial setting of CD unit in
Item 7.3.1).
 Check for CD Servo P.C.B.

The initial setting of CD unit must be completed. (Refer to the initial setting of CD unit in item
7.3.1.)
Step 1 Push the power button and the power turns OFF.
Step 2 Remove the FFC boards.
Step 3 Remove the CD changer unit.
Step 4 Remove 4 screws.
Step 5 Remove the mechanism unit cover.
 Check the CD Servo P.C.B. as shown below
Step 6 Lay the unit.
Step 7
Connect the FFC board (19 pin) from CD servo P.C.B..