Panasonic SA-AK250PL User Manual

RMS output power
THD 10%, both channels driven
1 kHz 115 W per channel (3 Ω)
Total output power 230 W
PMPO 2500 W
n FM/AM TUNER, TERMINALS SECTION
Preset station FM 20 stations
AM 15 stations
Frequency Modulation (FM)
Frequency range 87.9 to 107.9 MHz (200 kHz
steps)
87.5 to 108.0 MHz (100 kHz
steps)
Sensitivity 4.0 µV (IHF)
S/N 26 dB 2.2 µV
A
ntenna terminal(s) 75 Ω (unbalanced)
A
mplitude Modulation (AM)
Frequency range 520 to 1710 kHz (10 kHz step)
Sensitivity
S/N 20 dB (at 1000 kHz) 560 µV/m
A
udio performance (Amplifier)
Input Sensitivity/ Input Impedance
A
ux 250 mV, 14.7 kΩ
Music Port input jack
© 2007 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-AK250PL
Colour
(S)... Silver Type
Terminal Stereo, 3.5 mm jack
Sensitivity 100 mV, 4.7 kΩ
Phone jack
Terminal Stereo, 3.5 mm jack
n CASSETTE DECK SECTION
Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response (+3, -6 dB) at DECK OUT
NORMAL 35 Hz to 14 kHz
S/N ratio 50 dB (A weighted)
Wow and flutter 0.18 % (WRMS)
Fast forward and rewind time Approx. 120 seconds with
C-60 cassette tape
n DISC SECTION
Disc played [8 cm or 12 cm]
(1) CD-Audio (CD-DA)
(2) CD-R/RW (CD-DA, MP3* formatted disc)
CD Stereo System
Notes: This model’s CD mechanism changer unit is CRS1. Please refer to the original Service Manual
(Order No. MD0509368C0) for this mechanism.
Specifications
ORDER NO. MD0704054CE

Panasonic SA-AK250PL Specifications

General

CD Player	Yes
FM/AM Tuner	Yes
Bluetooth	No
USB Playback	No
Number of Discs	1
Playable Media	CD, CD-R/RW, MP3
Frequency Response	40 Hz - 20 kHz
Speaker Type	2-way
Speaker Configuration	2 speakers

Summary

Safety Precautions

General Guidelines

General safety guidelines for performing service operations.

Leakage Current Cold Check

Procedure for performing a leakage current check when the unit is cold.

Leakage Current Hot Check

Procedure for performing a leakage current check when the unit is powered on.

Before repair and adjustment

Precautions to take before starting repair or adjustment procedures.

Protection Circuitry

Information and procedures related to the unit's protection circuitry.

Safety Part Information

Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices

Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices

Techniques to reduce component damage from electro static discharge (ESD).

Handling Precautions For Traverse Unit

Handling Precautions For Traverse Unit

Precautions for handling the traverse unit, especially the laser diode, to prevent damage.

Precaution of laser diode

Precaution of laser diode

Safety precautions and warnings regarding the use of the laser diode in the optical pickup unit.

Operating Procedures

Main Unit Key Buttons Operations

Remote Control Key Buttons Operations

Self diagnosis and special mode setting

Service Mode Summary Table

Summary table of service modes for checking and inspection purposes.

Special Mode Table 1

Details on Special Mode Table 1 for various checks and settings.

EEPROM Checksum (ROM Correction)

Reliability Test Mode (CRS1 Mechanism)

Error code Table Display

Information on unit problems and respective components displayed via error codes.

Error Code Table for Deck Mechanism

Table listing error codes specific to the deck mechanism unit.

Error Code Table For CD Changer Block

Table listing error codes specific to the CD changer block.

Error Code Table For Power Supply

Table listing error codes specific to the power supply unit.

CRS1 Error Code display

Assembling and Disassembling

Caution

General cautions and special notes to be observed during disassembly and servicing.

Disassembly flow chart

Procedure for disassembling the casing and internal parts for inspection.

Main Parts Location

Disassembly of Top Cabinet

Disassembly of CD Changer Unit (CRS1)

Procedure for detaching and removing the CD changer unit (CRS1) from the main unit.

Disassembly of Rear Panel

Disassembly of Main P.C.B.

Procedure for detaching and removing the Main Printed Circuit Board (P.C.B.).

Disassembly of Transformer P.C.B.

Procedure for detaching and removing the Transformer Printed Circuit Board (P.C.B.).

Disassembly of Power P.C.B.

Procedure for detaching and removing the Power Printed Circuit Board (P.C.B.).

Disassembly of Front Panel Unit

Disassembly for Panel P.C.B.

Procedure for detaching and removing the Panel Printed Circuit Board (P.C.B.).

Disassembly of Tact Switch P.C.B.

Disassembly of Deck mechanism unit

Procedure for detaching and removing the Deck mechanism unit.

Disassembly of Deck P.C.B.

Procedure for detaching and removing the Deck Printed Circuit Board (P.C.B.).

Disassembly of Traverse Unit

Disassembly for Deck Mechanism

Replacement of Pinch Roller and Head Block

Replacement of Motor, Capstan Belt A, Capstan Belt B, and Winding Belt

Disassembly of Deck Mechanism P.C.B.

Disassembly of cassette lid

Rectification for tape jam problem

Steps to resolve issues related to tape jamming in the cassette deck.

Service Positions

Checking and Repairing of Main P.C.B.

Checking and Repairing of Transformer P.C.B.

Checking and Repairing of Panel, Deck & Deck Mechanism P.C.B.

Checking and Repairing of Power P.C.B.

Procedure for Checking Operation of Individual Parts of Deck Mechanism Unit

Operation Check with Cassette Tape

Procedure for checking deck mechanism operation with a cassette tape inserted.

Operation Check without Cassette Tape

Measurement And Adjustments

Cassette Deck Section

Procedures for measurement and adjustment of the cassette deck section.

Voltage and Waveform Chart

CD Servo P.C.B.

Deck P.C.B. & Deck Mechanism P.C.B.

Main P.C.B.

Panel P.C.B. & Transformer P.C.B.

Power P.C.B.