Panasonic sa ak57

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ORDER NO MD9902023CS

Service Manual

@couiiwrr M ASH *2D_ CD Stereo System

(filmgéfi .. p n o . L o e l c S A AK57

SB-PS70 SB-PS70
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Remote SB-AK57 SA-AK57 SB-PC70 SB-AK57

Control
Transmitter System Music Center Speaker Center Speaker Surround Spealdier
SC-AK57(GC) SA-AK57(GC) SB-AK57(GC) sa- Pcmrép) L .l 8% M
*1

MASH is a trademark of NTT. *2 Manufactured under license from Dolby LabDEgLQfles

Licensing Corporation.
DOLBY, the double-D symbol and "PRO LOGlC" are

TAPE SECTION 2 ARZ MECHANISM SERIES trademarks of Dolby Laboratories Licensing Corporation.
CD SECTION : RAEO1522-M TRAVERSE DECK SERIES

I Specifications

I Amplifier Section I FM Tuner Section
Front speaker Frequency range 87.5 , 108.0 MHz (50 kHz steps)
Power output Sensitivity 1.8 pV(IHF)
PMPO 2200W SIN 26dB 1.5 llV
FtMS power output Antenna terminal(s) 75 Q (unbalanced)
THD (at 1 kHz) 10%, both channels driven .
105w per channel (so) I AM Tuner Section
Power output in Frequency range 522 - 1629 kHz (9kHz steps)
Doldy Pro Logic mode 520 - 1630 kHz (IOkHz steps)
PMPO Total 3300W Sensitivity
RMS power output SIN 20 dB 500 IIV/m
THD (at 1kHz) 10% both channels driven Total 390W .
Front 105w per channel (so) I CD Section
Center 90W per channel (89) Sampling frequency 44.1 kHz
Surround 45W per channel (89) Decoding 16 bit linear
Input sensitivity and impedance Beam source/wave length Semiconductor laser / 780 nm
AUX 250mV,1OKQ Number of channels Stereo
MIC 0.7mV. 6009 Frequency response 20HZ - ZOKHZ (+1dB, v2dB)
Wow and flutter Below measurable limit
I Cassette Deck Section Digital filter 815
Track system 4 track, 2 channel D/A converter MASH (1 bit DAC)
Heads I G I
Record/playback Solid permalloy head Powsllihasumption 184W
MET Dwme giggwgenfiggf Power supply AC 110VI127V/220V/280 , 240v, 50/60Hz
Recording system AC bias 100 kHz DimenSIons ON x H x D) 270 x 331 x 338 mm
Erasing system AC erase 100 kHz Weight 8-6 k9
Tape speed 4.8 cm/s
Overall frequency response (+3, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 HZ - 14 kHz
HIGH (TYPE II) 35 HZ - 14 kHZ
SIN .
Dolby NH olf soda (A weighted) "mes

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

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

Dolby NR on 60518 (CCIR)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time

Approx. 120 seconds with 0-60 cassette tape

© 1999 Matsushita Electronics (S) Pte. Ltd.

I
® All rights reserved. Unauthorized copying
nason lc and distribution is a violation of law.

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SA-AK57
A WARNING

This service intormation is designed for experiense 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 Page Page
BEFORE USE ............................................................. 2 ILLUSTRATION OF ICs, TRANSISTORS 8t DIODES ,,,,, 23
BEFORE REPAIR AND ADJUSTMENT 2 TERMINAL FUNCTION OF ICs 24 ~ 26
PROTECTION CIRCUITRY . 2 SCHEMATIC DIAGRAM 27 ~ 46
ACCESSORIES ............... 2 PRINTED CIRCUIT BOARD 7 ~ 57
HANDLING PRECAUTIONS FOR TRAVERSE DECK 3 BLOCK DIAGRAM ............ 58 ~ 66
PRECAUTION, OF LASER DIODE 3 WIRING CONNECTION DIAGRAM 67
SETTING THE TIME 4 TROUBLESHOOTING GUIDE ..... 68
CONNECTIONS ........ 5 MECHANISM PARTS LOCATION (RAA3406)

LOCATION OF CONTROLS 6 MECHANISM PARTS LIST ............

RECORDING FROM RADIO BROADCASTS 7 LOADING MECHANISM PARTS LIST

RECORDING FROM COMPACT DISCS
TAPE-TO-TAF'E RECORDING

CD LOADING UNIT PARTS LOCATION
CABINET PARTS LOCATION ..

10

OPERATION CHECKS AND MAIN ooi/ifi'csiiém REPLACEMENT 10 ~ 17

SELF-DIAGNOSTIC DISPLAY FUNCTION 18
DESCRIPTION OF ERROR CODE 19
CD TEST MODE FUNCTION ....... 20

REPLACEMENT PARTS LIST .
RESISTORS & CAPACITORS .
PACKING MATERIALS 8i ACCESSORIES
PACKAGING ......................................

MEASUREMENTS AND ADJUSTMENTS

I Before Use

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 it this setting is not made correctly. (There is no voltage selector for some
countries; the correct voltage is already set.)

I Before Repair and Adiustment

Disconnect AC power, discharge Power Supply Capacitors 0554 ~ 0557, 0539 through a 109 , 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 220V, 230V » 240V, 50 Hz in NO SIGNAL mode should be ~420mA, ~420mA respectively.
I 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 it 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.

I Accessories

EUR646490

RSAOOOG-J RSA0022-L SJP5213-2

RJA0019-2K

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