Panasonic sa ak55

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ORDER NO. MD980409103

Service Manual

[flDDMPACT MAS H *1 *2

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DIGITAL AUDIO.

[II-OLBY B NR

CD Stereo System

SA-AK55

Colour
(8) lver Type
Area
Suffix for
rea ur
Model No. A COIO
. . (GC) Asia, Latin America, Africa (8)
Remote SB-Psss SB Control
Transmitter

System Music Center Speaker

Center Speaker Surround Speaker

*ILMASHisatrademarkchTT. SC-AKssteo SA-AKSStGC) SB~AK55

SB-PC55 (GCI)

SB-PSSS (GCI)

*2

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.

"Dolby" and the double-D symbol are trade marks of Dolby
Laboratories Licensing Corporation

TAPE SECTION : AR2 MECHANISM SERIES
CD SECTION : RAE01522-M TRAVERSE DECK SERIES

I Specifications

I Amplifier Section I FM Tuner Section
Front speaker power output Frequency range

PMPO ZOOOW (60) Sensitivity

RMS power output SIN 26dB

THD 10%, both channels driven
Power output in
Doldy Pro Logic mode

PMPO Total 2500W
RMS power output

THD 10% both channel driven

100W per channel (69) Antenna terminal(s)

I AM Tuner Section
Frequency range

Front 100w per channel (so) Sensitivity
Center 45W per channel (SQ) SIN 20 dB
Surround 22.5w per channel (49) .

Input sensitivity and impedance I CD. SECTIOH
AUX 250mV,10KQ Sampling frequency
MIC mm, 6009 Demdmg

Beam source/wave length
Number of channels
Frequency response

I Cassette Deck Section

Track system 4 track, 2 channel

Heads Wow and flutter
Record/playback Solid permalloy head Digital filter
Erasure Double gap ferrite head D/A converter

Motor DC servo motor I

Recording system AC bias 100 kHz I Genera

Power consumption

Erasing system AC erase Power su
PP'V
Tape speed 4.8 cm/s - .
Frequency response (+3, -6 dB at DECK OUT) $33230 (W x H x D)
NORMAL (TYPE I) 35 Hz - 14 kHz
HIGH (TYPE II) 35 Hz - 14 kHz
S/N .
Dolby NR oft 50dB(A weighted) "mes '
Dolby NR on 60dB(CCIR)

Wow and flutter
Fast forward and rewind time
Approx. 120 seconds with (2-60 cassette tape

0.18 % (WRMS)

analyzer.

875 - 108.0 MHZ (50 kHz steps)

1.5 11V
75 Q (unbalanced)

522 - 1629 kHz (9kHz/Step)
520 - 1630 kHz (iokHflStep)

500 uV/m

44.1 kHz

16 bit linear

Semiconductor laser / 780 nm
Stereo

20Hz e 20kHz (+1 dB, -2dB)
Below measurable limit

8 ts

MASH (1 bit DAC)

156W

AC 110V/127V/220V/230 - 240V, 50/60 HZ

270 x 336 x 347 mm
8.3 kg

1. Specifications are subject to change without notice.
Weight and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum

Panasonic®

© 1998 Matsushita Electronics (S) Pte. Ltd,
All rights reserved. Unauthorized copying
and distribution is a violation of law.

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SA-AK55
AWARNING

This sen/ice information 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 sen/ice or repair the product or products dealt with

in this service information by anyone else could result in serious injury or death.

I Contents
BEFORE USE

BEFORE REPAIR
PROTECTION CIRCUITRY ..............
HANDLING PRECAUTIONS FOR TRAVERSE DECK .
PRECAUTION OF LASER DIODE ..
BEFORE MOVING OR SHIPPING T
ACCESSORIES ..
CONNECTIONS ..
LOCATION OF CONTROLS
SETTING THE TIME
RECORDING FROM RADIO BROADCASTS .
RECORDING FROM COMPACT DISCS .
TAPE- TO TAPE RECORDING
OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT1 3 ~ 18

P39

(in

SELF- DIAGNOSTIC DISPLAY FUNCTION. 19
DESCRIPTION OF ERROR CODE 20
CD TEST MODE FUNCTION ......... 21

I Before Use

Page
MEASUREMENTS AND ADJUSTMENTS ...................... 22 & 23
TERMINAL GUIDE OF ICS, TRANSISTORS & DIODES. 24
TERMINAL FUNCTION OF ICs . 25 ~ 27
SCHEMATIC DIAGRAM ...... .. 28 ~ 44

BLOCK DIAGRAM
PRINTED CIRCUIT BOARD
WIRING CONNECTION DIAGRAM
TROUBLESHOOTING GUIDE
MECHANISM PARTS LOCATION (RAA3406) .
MECHANISM PARTS LIST .............
LOADING MECHANISM PARTS LIST
CD LOADING UNIT PARTS LOCATION
CABINET PARTS LOCATION
REPLACEMENT PARTS LIST
RESISTORS & CAPACITORS
PACKING MATERIALS 8t ACCESSORIES
PACKAGING

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 unit will be used. (If the power

supply in your area is 110 V, set to the "110 V" 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.)

I Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C504 ~ 0507 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, 240V, 50 Hz in NO SIGNAL mode should be

~420mA, ~420mA respectively.

I Protection Circuitry

The protection circuitry may have operated it 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.