Panasonic sa ak 240 pc service manual

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ORDER NO. MD051247001

Service Manual

COMPACT

DIGITAL AUDIO

SA-AK24O

Remote SB-AK24O SB-AK240
Control

CD Stereo System

SA-AK24OP
SA-AK24OPC

Colour
(S)... Silver Type

Notes: This models CD mechanism changer unit is CRS1. Please refer to the original Service Manual

(Order No. M00509368CO) for this mechanism.

Specifications

n AMPLIFIER SECTION

FTC Output power

THD 10%, both channels driven
100 HZ to 10 kHz

Total FTC power

RMS Output Power

THD 10%, both channels driven
1 kHz

Total output power

n FMIAM TUNER, TERMINALS SECTION
Preset station

90 W per channel (3 Q)
180 W

115 W per channel (3 Q)
230 W

FM 15 stations
AM 15 stations
Frequency Modulation (FM)

Frequency range 87.9 to 107.9 MHz (200 kHz

steps)

87.5 to 108.0 MHz (100 kHz

steps)

Sensitivity 4.0 V (IHF)
S/N 26dB 2.2 [N

Antenna terminals
Amplitude Modulation (AM)
Frequency range

75 Q (unbalanced)

520 to 1710 kHz (10 kHz step)
Sensitivity

S/N ZOdB (at 1000 kHz) 560 pV/m

Panasonic

Music Port input jack

Terminal Stereo, 3.5 mm (1/8") jack
Sensitivity 100 mV, 4'7 kn
Phone jack

Terminal Stereo, 3.5 mm (1/8") jack

n CASSE'I'I'E DECK SECTION

Track system 4 track, 2 channel

Heads

Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor

AC bias 100 kHz
AC erase 100 kHz
Tape speed 4.8 chs (1»7/8 ips)
Overall frequency response (+3, -6 dB) at DECK OUT
NORMAL 35 Hz to 14 kHz
S/N Ratio 50 dB (A weighted)
Wow and flutter 0.18 /0 (WRMS)
Approx. 120 seconds with

Recording system
Erasing system

Fast fon/vard and rewind time
0-60 cassette tape

n DISC SECTION

Disc played [8 cm (3") or 12 cm (5")]

(1) CD-Audio (CD-DA)

© 2006 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

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SA-AKZAOP I SA-AKZAUPC

(2) CD-R/RW (CD-DA, MP3, WMA formatted disc)
(3) MP3/WMA

Bit rate

MP3, WMA 32 kbps to 320 kbps
Sampling frequency

MP3, WMA 32 kHz, 44.1 kHz, 48 kHz
CD»DA 44.1 kHz
Decoding 16 bit linear
Digital filter 8 fs
D/A converter MASH (1 bit DAC)
Pick up

Wavelength 780 nm

Beam Source Semiconductor laser
Audio output (Disc)
Number of channels
11 GENERAL

Power supply

2 (Stereo) (FL,FR)

AC 120 V, BOHZ

100 W
0.28 W

Power consumption

Power consumption
mode

in standby

250 x 330 x 343 mm
(9-27/32" x 13" X 13-1/2)
6.6 kg (14.6 lb.)

+5 to +35°C (+41 to +95°F)
)

5 to 90% RH (no condensation

Dimensions (W x H x D)

Mass

Operating temperature range

Operating humidity range

It SYSTEM

SC»AK240 (P) Music center: SA-AK240 (P)
Speaker: SB-AK240 (P)

Music center: SA-AK240 (PC)
Speaker: SB-AK240 (P)

SC-AK240 (PC)

Notes:

1.Specifications are subject to change without notice. Mass and
dimensions are approximate.

2.Total harmonic distortion is measured by the digital spectrum
analyzer.

A WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

CONTENTS

1 Safety Precautions -----
1.1. General Guidelines -------------------------------------------------------- 4

1.2. Caution for fuse replacement ------------------------------------------ 5

1.3. Before repair and adjustment

1.4. Protection Circuitry
2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices ................................. 5
3 Handling Precautions For Traverse Deck ............................... 7
4 Precaution of laser diode ....................................................... 3
5 Handling the Lead-free Solder ................................................ 9

5.1. About lead free solder (PbF) .......................................... 9

6 New Features ----------------------------------------- 10
6.1. CRSf Mechanism Overview-
6.2. Music Port

7 Accessories-

8 Operating lnstruc ons Procedures-

9 Self diagnosis and special mode setting ------------------------------ 16
9.1. Special Mode Table -------------------------------------------------- 16

9.2. Error code Table ---------------------------------------------- 18

1o Assembling and Disassembling ------------------------------------------- 22
10.1. Caution ------------------------------------------------------------------ 22
10.2. Disassembly flow chart ---------------------------------------------- 23

10.3. Main Parts Location

10.4. Disassembly of Top Cabinet

10.5. Disassembly of Rear Panel -- -- 25
10.6. Disassembly of CD Changer Unit (CR31) ..................... 25
10.7. Disassembly of Main P.C_B. ......................................... 27

Page

10.8. DiSassembly of Transformer P.C.B. .............................. 27
10.9. Disassembly of Power P.c.B. ...................................... 23
10.10. Disassembly of Front Panel Unit ................................... 29

10.11. Disassembly for Panel P.C.B. -------
10.12. Disassembly of Deck mechanism unl -
10.13. Disassembly of Deck P.C.B. ---------

10.14. Disassembly of Traverse Unit --------------------------------------- 31
10.15. Disassembly of optical pickup unit (CD mechanism) ------ 33
10.16. Disassembly of Deck Mechanism .................................. 35
10.17. Replacement for cassette lid ......................................... 33
10.18. Rectification for tape jam problem ................................. 38
11 Service Fixture and Tools ..................................................... 4n

12 Service Positions -------
12.1. Checking and Repairing of Main P.C.B.-
12.2. Checking and Repairing of Transformer P.C.B.

12.3. Checking and Repairing of Panel, Deck 8. Deck

Mechanism P.C.B. ....................................................... 42

12.4. Checking and Repairing of Power P.C.B. ...................... 43

13 Measurements and Adjustments .......................................... 44
13.1. Cassette Deck Section ................................................. 44
13.2. Tuner Section .............................................................. 45

14 Voltage and Waveform Chart ................................................ 47

14.1. CD Servo P.C.B. & Main P.C.B. ---------
14.2. Power PCB. and Transformer P.C.B.
14.3. Waveform Chan ---------------------
15 Wiring Connection Diagram .................................................. 52
16 Block Diagram ...................................................................... 53