Panasonic sa ak250

Page 1

SA-AK2SDGCP

(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3 formatted disc)

(3) MP3

MPEG-t Layer 3, MPEG-2 Layer 3

Bit rate

MP3 32 kbps to 320 kbps
Sampling frequency

MP8 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

n GENERAL

2 (Stereo) (FL, FR)

Power supply
AC 110 to 127/220 to 240 V, 50/60HZ
95 W
0.7 W (Approx)

Power consumption

Power
mode

consumption in standby

250 X 330 x 323 mm

7.1 kg

+5 to +35°C

5 to 90% RH (no condensation)

Dimensions (W x H x D)

Mass

Operating temperature range

Operating humidity range

n SYSTEM

SC-AK250 (GCP) Music center: SA-AK250 (GCP)
Speakers: SB-AK250 (PL)

For Information on speaker system, plesae refer to the original
Service Manual (Order No. MD07040550E) for SB-AK250PL-S.

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

Page

1 Safety Precautions ------------------------------------------------------------------ 4

1.1. General Guidelines
1.2. Before Use ...........

1.3. Before repair and adjustment ----------------------------------------- 4
1.4. Protection Circuitry --------------------------------------------------------- 4
1.5. Safety Part Information -------------------------------------------------- 5

2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices --------------------------------- 5
3 Handling Precautions For Traverse Unit -------------------------------- 7
4 Precaution of Laser Diode ------------------------------------------------------ 9
5 About Lead Free Solder (PbF) ---------------------------------------------- 10

5.1. Service caution based on legal restrictions

6 Accessories -----------------------------------------------------

7 Operating Procedures ........................................................... 12
7.1. Main Unit Key Buttons Operations -------------------------------- 12
7.2- Remote Control Key Buttons Operations ....................... 13

3 New Features ..........
8-1- Using the Music Port

9 Self diagnosis and special mode setting .............................. 15
9-1- Sen/ice Mode Summary Table -------------------------------------- 15
9.2. Special Mode Table 1 -------------------------------------------------- 15

9.3. Reliability Test Mode (CRS1 Mechanism)-
9.4. Error code Table Display ......................

10 Assembling and Disassembling ........................................... 25
10.1. Caution ------------------------------------------------------------------------ 26
10.2. Disassembly flow chart ................................................. 27
10.3. Main Parts Location ----------------------------------------------------- 23

Page

104. Disassembly of Top Cabinet ......................................... 29
10.5. Disassembly of CD Changer Unit (CRS1)
10.6. Disassembly of Rear Panel ....................

10.7. Disassembly of Main P.C.B. ......................................... 31
10.8. Disassembly of Transformer P_C_B_ .............................. 31
10.9. Disassembly of Power P.C.B. ...................................... 32

10.10. Disassembly of Front Panel Unit
10.11. Disassembly for Panel P.C.B.-

10.12. Disassembly of Tact Switch P.C.B. ............................... 34
10.13. Disassembly of Deck mechanism unit ........................... 34
10.14. Disassembly of Deck P.C.B. ----------------------------------------- 34

10.15. Disassembly of Traverse Unit-
10.16. Disassembly for Deck Mechanism-
10.17. Disassembly of Deck Mechanism P.C.B. ----------------------- 39
10.18. Disassembly of cassette lid -----------

10.19. Rectification for tape jam problem --------------------------------- 40

11 Service Fixture and Tools

12 Service Positions ---------
12.1. Checking and Repairing of Main P.C.B. ........................ 42
122- Checking and Repairing of Transformer P.C.e ............. 43
12.3. Checking and Repairing of Panel, Deck & Deck

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

13 Procedure for Checking Operation of Individual Parts of Deck
Mechanism Unit -------------------------------------------------------------------- 45
13.1. Operation Check with Cassette Tape ............................ 45
13.2. Operation Check without Cassette Tape ....................... 45

Page 2

14 Measurement And Adiustmems -------------------------------------------- 47
14.1. Cassette Deck Section ................................................. 47
15 Voltage and Waveform Chart .49
15.1. CD Servo P.C.B. ---------- .49
152- Deck P.C.B. & Deck Mechanism P.C,B, ------------------------ 49
15.3. Main P.C.B. ----------------------------------------------------------------- 50
15.4. Panel P.C.B. 8. Translormer P_C_B, ------------------------------- 51
15.5. Power P.C.B. .51

15.6. Waveform Char
16 Wiring Connection Diagram

-52
-53
17 Block Diagram 55

17.1. CD Servo Diagram ------------------------------------------------------- 55
-56

17.2. Deck/ Deck Mechanism Diagram

17.3. Main Diagram-- -57
17.4. Panel Diagram- -59
17.5. Power Diagram ------------------------------------------------------------ 60
17.6. Transformer Diagram --------------------------------------------------- 61

-63
-65

18 Notes 01 Schematic Diagram

19 Schematic Diagram

19.1. (A) CD Servo Circui -65
19.2. (B) Main Circuit ------------------------------------------------------------ 66
19.3. (C) Panel Circuit ------------------------------------------------------- 70

19.4. (D) Sub Panel Circuit & (G) Deck Mechanism Circuit ----- 71

SA-AKZSOGCP

19.5. (E) Power Circuit ---------------------------------------------------------- 72
19.6. (F) Deck Circuit ..................................................... 74
19.7. (H) Translormer Circuit
20 Printed Circuit Board --------
20.1. (A) CD Servo P.C.B., (F) Deck P.C.B. & (a) Deck
Mechanism P.C.B. -------------------
20.2. (B) Main P.C.B. ............................................................ 79
20.3. (C) Panel P.C.B. ------
20.4. (D) Sub Panel P.C B 81
20.5. (E) Power P.C. .
20.6. (H) Translormer P.C.B. ................................................. 83
21 Illustration ol le, Transistors and Diodes --------------------------- 35
22 Terminal Function 01 IC's ............................................ 35
22.1. |C7001 (MN6627954MA) Servo Processor,Digital Signal
Processor/Digital filter and WA Convener ...................... 86
22.2. |C7002 (BA5948FPE2) IC 4CH Drive ---------------------------- 87
22.3. IC2801 (C2CBYY000482) System Microprocessor --------- 87
23 Exploded Views ----------------

23.1. Cabinet Parts Location
23.2. Deck Mechanism Parts Location (RAA4403-S)
23.3. Packaging -------------------------------------------------------------------- 92
24 Replacement Parts List --------------------------------------------------------- 93