Panasonic sa ak50

Page 1

ORDER NO. M09707059C3

Service Manual

[filfiéffi MASH

Remote Control
Transmitter

SA-AKSO

SB-AK90
Tape Deck : Mechanism AR2 Series

Traverse Deck: RAE0152Z Mechanism Series

Specifications
AMPLIFIER SECTION
RMS power output
THD 10%, both channels driven

LOW 92 W per channel (6 0)

HIGH 38 W per channel (6 Q)
Total BI-AMP power 130 W per channel
PMPO 2000 w (5 52)
Total harmonic distortion

Halt power at 1 kHz LOW 003 % (6 (2)
HIGH 0.15 % (6 9)

Input sensitivity and Impedance

AUX 250 mV, 57 kn

MIC 0.6 mV, 680 9
Tone controls

6 E0 SPACE HEAVY, CLEAR, SOFT, HALL, LIVE, DISCO
Load Impedance 6 9
FM TUNER SECTION
Frequency range 875040800 MHz (50 kHz steps)
Sensitivity 23.3 dB! (4.0 11v, mess)
Total harmonic distortion

MONO 0.3 %

STEREO 0.5 %
SIN

MONO 60 dB
Image rejection at 98 MHz 35 dB
Stereo separation at 1 kHz 35 dB
Antenna ierminal(s) 75 a (unbalanced)

AM TUNER SECTION
Frequency range 531 - 1602 kHz (9 kHz steps)
530 - 1600 kHz (10 kHz steps)
Sensitivity (for 500 mW)
(at 999 kHz) 250 itV/m
CASSETTE DECK SECTION
Track system
Heads
Record/playback Solid permalloy head (Rotary head)
Erasure Double gap ferrite head

Panasonic

4 track, 2 diannei

SB-AK90

CD Stereo System

SA- AK5O

(GT) .....

Colour

(H) .............. Gray Type

Areas

(GC) ----------- Asia, Latin America,
Middle East and Africa

(GH) ~~~~~ ~~Hong Kong

-~Taiwan

3:4 0 MASH is a trademark oi NTT.

System

Main unit Speakers

SC-AKSO

SAvAKSO SB-AK90

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 (15, -6 dB) at deck out]

NORMAL 35 Hz - 14 kHz

HIGH 35 1-12 - 14 kHz
SIN (HIGH)

Dolby NR off 50 dB (A weighted)

Dolby NR on 60 dB (CCIR)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time Approx. 120 seconds

with C-60 cassette tape

CD SECTION
Sampling frequency 441 kHz
Decoding 16 bit linear
Beam source/wave length Semiconductor laser/780 nm
Number oi channels Stereo
SIN

co UNIT our 95 dB (us/s.)
Wow and flutter Below measurable limit
Digital tiller 8 is
D/A converter MASH (1 bit DAC)
GENERAL
Power consumption 165 W
Power supply AC 110 V/ 127 V/220 V/230-240 V, 50/ 60 Hz
Dimensions (WxHxD) 270 x 345 x 314 mm
Weight 8.25 kg
Notes:

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

analyzer.

© 1997 Matsushita Electric Industrial 00., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

Contents

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SA-AK5O

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 prolessional technicians. Any attempt to
service or repair the jroduct or products dealt with in this service information by anyone else could result in serious injury or death.

I Contents

° Handling Precautions For Traverse Deck -
- Precaution of Laser Diode ~~~~~~~~~~~~~~~~~~~~~
- Accessories ------------
- Location of Controls ~
. Connections .......................................................... 5V 5
~ Operation Checks and Main

Component Replacement Procedures 7 ~ 24
- Schematic Diagram -------------------------------- - 25 ~ 44
0 Block Diagram -------------------- ~ 45 ~ 52
- Printed Circuit Board Diagram - 53 - 60

Page
- Terminal Guide of ICs, Transistors and Diodes ------------ 61
0 Wiring Connection Diagram ................................. 62' 63
- Mesurements and Adjustments -- 64 - 66

- Adjustment Points ~~~~~~~~~~~~~~~~~~~~
- Replacement Parts List ~-
- Cabinet Parts Location
- CD Loading Unit Parts Location
- Mechanism Parts Location ~
- Loading Mechanism Parts List
- Tape Deck Mechanism Parts List

I Safety Precaution (This safety precaution is applied only in U.s.A.)

999N.

customer from being exposed to a shock hazard.
o INSULATION RESISTANCE TEST

Before servicing, unplug the power cord to prevent an electric shock.

When replacing parts, use only manufacture's recommended components tor safety.

Check the condition of the power cord. Replace il wear or damage is evident.

After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the

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 jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3M) and
5.2 M!) to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to all exposed
parts. (Fig. B)

Note: Some exposed parts may be isolated from the chassis by design. These will read inlinity.

Antenna
terminal \
Exposed _,4 Exposed [4'0
metal part metal part
Ohmmeter Ohmmeter
(Fig. A) (Fig. B)

Resistanoe=3M Q -5.2M Q Resistance=Approx. co

4. lithe 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.