Panasonic AK 47

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panasonic AK 47

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Page 1

ORDER NO. M0990405302

ervice Manual

comm CD Stereo 8 stem
MASH *_[| DOLBY B NR y
mu u Slaxu namesmpmg
DIGITAL AUDIO * Dolby noise reduction manufactured under license from SA- A K47
Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol aretrade marks ol Dolby COIOUI-
Laboratories Licensing Corporation. (8) Silver Type
Area
Suffix for
Model No. Area Colour
(E) Europe
(EB) Great Britain (S)
(EG) Germany
= System Music Center Speaker
2:33: SB-AKN SA-AK47 SB-AK47 SC-AK47 (E) SA-AK47 (E) SB-AK47 (E)
T'ansmmfir SC-AK47 (EB) SA-AK47 (EB) SB-AK47 (E)
sc-AK47 (EG) SA-AK47 (EG) SB-AK47 (E)
TAPE SECTION : AR2 MECHANISM SERIES
CD SECTION : RAE015ZZ-M TRAVERSE DECK SERIES
I Specifications
I Amplifier Section I FM Tuner Section
HMS power output Frequency range 87.5 - 106.0 MHz (50 kHz steps)
THD 10%. both channels driven 130W per channel (6 It) Sensitivity
1 kHz continuous power output SIN 26 ca 1.5 (1V
THD 1%both channel driven (DIN) 85W per channel (6 n) Antenna terminal(s) 75 Q (unbalanced)

Input sensitivity

AUX 250 mV
Input Impedance

AUX 13.3 kn

I Cassette Deck Section

Track system 4 track, 2 channel

Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC sen/o motor

AC bias 100 kHz
AC erase 100 kHz

Recording system
Erasing system

Tape speed 48 cm/s
Frequency response (+3, -6 dB at DECK OUT)

NORMAL (TYPE I) - 35 Hz - 14 kHz

HIGH (TYPE II) 35 Hz - 14 kHz
SIN

Dolby NFl off 50 dB (A weighted)

Dolby NR on

Wow and flutter
Fast forward and rewind time ,
Approx. 126 seconds with C-60 cassette tape

so dB (CCIR)
0.1a % (WRMS)

Panasonic?

I AM Tuner Section

Frequency range 522 e 1629 kHz (QkHz steps)

Sensitivity

SIN 20 dB 560 )LV/m
I 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 20Hz - 20kHz (+1dB, -2dB)
Wow and flutter Below measurable limit
Digital filter Bis
DIA converter MASH (1 bit DAC)

I General
Power consumption 163W
Power supply
EIEG AC 230 V, 50 Hz
EB AC 230 - 240 V, 50 Hz
Dimensions (W x H x D) 270 x 331 x 338 mm
Weight 8.4 kg
Notes :

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

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

© 1999 Matsushita Electronics (8) Pte. Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SA-AK47

A WARNING

This service 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 service 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 REPAIR AND ADJUSTMENT ..
PROTECTION CIRCUITRY ...................
HANDLING PRECAUTIONS FOR TRAVERSE DECK
PRECAUTION OF LASER DIODE
ACCESSORIES
CAUTION FOR AC MAIN LEADS
SETTING THE TIME .
CONNECTIONS ......
LOCATION OF CONTROLS
RECORDING FROM RADIO BRO
RECORDING FROM COMPACT DISCS
TAPE-TO-TAPE RECORDING ................. .. 11
OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT 11 ~ 18

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SELF-DIAGNOSTIC DISPLAY FUNCTION 19
DESCRIPTION OF ERROR CODE ,. 20
CD TEST MODE FUNCTION ........... . 21
MEASUREMENTS AND ADJUSTMENTS 22& 23

I Before Repair and Adjustment

Page
ILLUSTRATION OF ICs, TRANSISTORS & DIODES 24
TERMINAL FUNCTION OF ICs .. 25 ~ 27
SCHEMATIC DIAGRAM ...... 28 ~ 43
PRINTED CIRCUIT BOARD 44 ~ 54
BLOCK DIAGRAM ............ 55 ~ 61
WIRING CONNECTION DIAGRAM 62
TROUBLESHOOTING GUIDE ....... 63
MECHANISM PARTS LOCATION (RAA3406) 64 & 65
MECHANISM PARTS LIST ................. 66
LOADING MECHANISM PARTS LIST. 66
CD LOADING UNIT PARTS LOCATION . 67 & 68
CABINET PARTS LOCATION . 69 & 70
REPLACEMENT PARTS LIST. 71 ~ 74
RESISTORS & CAPACITORS. 75 ~ 79
PACKING MATERIALS & ACCESSORIES. 80
PACKAGING ......................................... 80

Disconnect AC power, discharge Power Supply Capacitors 6504 ~ 0507, 0510 through a 10!; , 5W resistor to ground.
DO NOT SHORT-ClFtCUIT 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 230V, 50 Hz in NO SIGNAL mode should be ~450mA.

l 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 penormance.
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.

I 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 N05 (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 board).

4. Do not turn the variable resistor (laser power adjustment). It
has already been adjusted.

Lens
(Do not touch)

Flexible board
FFC
(Handle it carefully)

Variable resistor

No.5 Pin (GND) (Do not turn)

No.4 Pin (LD)