Panasonic SAAK22 - MINI HES W/CD-PLAYER User manual

■AMPLIFIER SECTION
Power output
10% Total harmonic distortion
70 Hz-16 kHz, both channels driven
(LOW) 60 W per channel (6 Ω)
Power output
10% Total harmonic distortion
1 kHz, both channels driven
(HIGH) 70 W per channel (6 Ω)
Input sensitivity
AUX 250 mV
Input Impedance
AUX 13 kΩ
■FM TUNER SECTION
Frequency range 87.9 - 107.9 MHz (200 kHz steps)
87.5 - 108.0 MHz (100 kHz steps)
Sensitivity 2.5 µV (IHF)
S/N 26 dB 2.2 µV
Antenna terminal(s) 75 Ω(unbalanced)
■AM TUNER SECTION
Frequency range 520 - 1710 kHz (10 kHz steps)
Sensitivity
S/N 20 dB (at 1000 kHz) 560 µV/m
© 2001 Matsushita Electronics (S) Pte. Ltd. All rights
reserved. Unauthorized copying and distribution is a
violation of law.
SA-AK22
Colour
(S)... Silver Type
Area
(P)... U.S.A.
(PC)... Canada
TAPE SECTION :
SG2 MECHANISM SERIES
CD SECTION :
RAE0152Z-3 TRAVERSE DECK SERIES
■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
Frequency response (+3 dB, -6 dB at DECK OUT)
HIGH (TYPE II) 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 8fs
CD Stereo System
Specifications
ORDER NO. MD0101009C1
A6

D/A converter MASH (1 bit DAC)
■GENERAL
Power supply AC 120 V, 60Hz
Power consumption 155 W
Dimensions (W x H x D) 250 x 332 x 316 mm
9 27/32” x 13 1/16” x 12 7/16”
Mass (7.6 kg) 16.8 lb
■SYSTEM
1 Safety Precaution 3
2 Before Repair and Adjustment 4
3 Protection Circuitry 4
4 Accessories 4
5 Handling Precautions For Traverse Deck 5
6 Precaution of Laser Diode 6
7 Operation Procedures 7
8 Operation Checks and Main Component Replacement
Procedures 9
9 Self-Diagnostic Function 19
10 Description of Error Code 20
SC-AK22(P) Music Center: SA-AK22(P)
Speaker: SB-AK22(P)
SC-AK22(PC) Music Center: SA-AK22(PC)
Speaker: SB-AK22(P)
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.
11 CD Test Mode Function 21
12 Measurements and Adjustments 21
13 Illustration of IC’s, Transistors and Diodes 24
14 Terminal Function of IC’s 25
15 Block Diagram 28
16 Schematic Diagram 34
17 Printed Circuit Board 47
18 Wiring Connection Diagram 57
19 Troubleshooting Guide 58
20 Parts Location and Replacement Parts List 59
CONTENTS
Page Page
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1 Safety Precaution
(This “Safety Precaution” is applied only in U.S.A.)
1.Before servicing, unplug the power cord to prevent an electric shock.
2.When replacing parts, use only manufacturer’s recommended components for safety.
3.Check the condition of the power cord. Replace if wear or damage is evident.
4.After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5.Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to
prevent the customer from being exposed to a shock hazard.
1.1. Insulation Resistance Test
1.Unplug the power cord and short the two prongs of the plug with a jumper wire.
2.Turn on the power switch.
3.Measure the resistance value with ohmmeter between the jumper AC plug and each exposed metal cabinet part, such as
screwheads, antenna, control shafts, handle brackets, etc.
Equipment with antenna terminals should read between 3 MΩand 5.2 MΩto all exposed parts*.(Fig.1)
Equipment without antenna terminals should read approximately infinity to all exposed parts.(Fig.2)
*Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.
4.If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be repaired
and rechecked before it is returned to the customer.
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2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C536, C545 and C546 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 120V, 60 Hz in NO SIGNAL mode should be ~400mA.
3 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.
4 Accessories
Remote Control
Transmitter
FM indoor antenna
AC mains lead
AM Loop antenna
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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 finish the
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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6 Precaution of Laser Diode
CAUTION:
This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
When the unit is turned on:
1.Do not look directly into the pick up lens.
2.Do not use optical instruments to look at the pick up lens.
3.Do not adjust the preset variable resistor on the pickup lens.
4.Do not disassemble the optical pick up unit.
5.If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.
6.Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation
exposure.
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.
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7 Operation Procedures
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8
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Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
• Main Component Replacement Procedures
8 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.
Contents
• Disassembly and assembly main unit
1.Checking of the Main, Panel, Deck and Power P.C.B.
1.Replacement of the Traverse Deck.
2.Replacement of the Power Amplifier IC.
• Disassembly and assembly of the Traverse Unit
• Disassembly and assembly of the Disc Tray
Warning:
This product uses a laser diode. Refer to caution statement Precaution of Laser Diode.
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Step 1 Remove 3 screws each side and 5 screws at rear panel.
Step 2 Remove the Top Cabinet
Step 3 Remove T-bracket.
Step 4 Remove 2 screws each side of the inner chassis and a
screw at the rear panel. Turn locating pin 90°.
(Locating pin need not have to be bent back).
Step 5 Release the wires CN 300, 301, 302, 304 and 309.
Remove rear panel by pulling backward and lift rear panel assy
off.
8.1. Disassembly and assembly main unit
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