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1、G GAMPLIFIER SECTION PMPO3000W RMS power output THD 10%, both channels driven (HIGH) 40W per channel (6) (MID) 40W per channel (6) (LOW) 120W per channel (6) (TOTAL) 200W per channel (6) Input sensitivity AUX250mA MIC0.7mV Input inpedance AUX13.9k MIC680 G GFM TUNER SECTION Frequency range87.50 - 10
2、8.00MHz (50kHz steps) Sensitivity2.5V (IHF) S/N 26dB2.2V Antenna terminal (s)75 (unbalanced) G GAM TUNER SECTION Frequency range552-1629kHz (9kHz steps) Sensitivity520-1630kHz (10kHz steps) S/N 20dB (at 999kHz)560V/m 2000 Matsushita Electric Industrial Co., Ltd. All rightsreserved.Unauthorizedcopyin
3、gand distribution is a violation of law. SA-AK48 Colour (S) . Silver Type Areas (GC) . Asia, Latin America, Middle East and Africa. TAPE SECTION : AR2 MECHANISM SERIES CD SECTION : RAE0152Z-M TRAVERSE DECK SERIES SYSTEM : SC-AK48 G GCASSETTE DECK SECTION Track system4 track, 2 channel Heads Record/p
4、laybackSoild permalloy head ErasureDouble gap ferrite head MotorDC servo motor Recording systemAC bias 100kHz Erasing systemAC erase 100kHz Tape speed4.8cm/s Frequency response (+3, -6dB) at DECK OUT NORMAL (TYPE I)35Hz - 14kHz HIGH (TYPE II)35Hz - 14kHz S/N50dB (A weighted) Wow and flutter0.18% (WR
5、MS) Fast forward and rewind timeApprox. 120 seconds with C-60 cassette tape G GCD SECTION Sampling frequency44.1kHz Decoding16 bit linear Beam source/wave lengthSemiconductor laser/ 780nm Number of channelsStereo Frequency response20Hz - 20kHz (+1dB, -2dB) Wow and flutterBelow measurable limit Digit
6、al filter8fs CD Stereo System Specifications ORDER No.MD0004060C3 RadioFans.CN 收音机爱 好者资料库 D/A converterMASH (1bit DAC) G GGENERAL Power supply :AC110V/127V/220V/ 230-240V, 50/50Hz Power consumption220W Powerconsumption instandby mode Eco mode on0.8W Eco mode off14W Dimensions (WxHxD)270 x331x338mm 1
7、 Accessories 3 2 Before Repair 3 3 Protection Circuitry 3 4 Handling Precautions for Traverse Deck 4 4.1. Handling the traverse deck (optical pickup) 4 4.2. Grounding for electrostatic breakdown prevention 4 4.3. Caution when Replacing the Traverse Deck 4 5 Precaution of Laser Diode 5 6 Location of
8、Controls 6 7 Location of Controls for Remote Control Transmitter 7 8 Operation Checks and Component Replacement Procedures 8 8.1. Checking for the main P.C.B. 8 8.2. Disassembly for the CD changer assy 9 8.3. Checking for the unit operational condition 11 8.4. Replacement for the traverse deck assy
9、13 8.5. Replacement for the disc tray 16 8.6. Disassembly and reassembly for mechanism base drive unit 18 8.7. Replacement for the motor assy 24 8.8. Replacement for the pinch roller assy and head block 25 8.9. Replacement for the CD motor assy, capstan belt A, capstan belt B and winding belt 27 8.1
10、0. Replacement for the components parts on the mechanism P.C.B. 29 8.11. Replacement for the cassette lid assy 29 8.12. Measure for tape trouble 30 9 Checking Procedure for Self-operation of Cassette Mechanism Assy 31 9.1. Operation Check Providing with Cassette Tape 31 9.2. Operation Check Not Prov
11、ided with Cassette Tape 31 Weight9.0kg 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. G GSYSTEM SC-AK48 : Main unit : SA-AK48 Speakers : SB-AK48 10 Self-Diagnostic Displa
12、y Function 32 11 Description of Error Code 33 11.1. Error Detection for Cassette Mechanism block 33 11.2. Error Detection for CD/Changer block 33 11.3. Error Detection for Cassette Mechanism block 33 12 CD Test Mode Function 34 13 Measurement and Adjustments 35 13.1. Tuner Section 35 13.2. Cassette
13、Deck Section 36 14 Illustration of ICs, Transistors and Diodes 38 15 Schematic Diagram 39 15.1. Schematic Diagram Notes 39 15.2. Schematic Diagram 40 16 Printed Circuit Board Diagram 58 17 Block Diagram 69 18 Troubleshooting Guide 77 19 Wiring Connection Diagram 79 20 Terminal Function of ICs 81 20.
14、1. IC600 (M38199MF227):System Control and FL Driver 81 20.2. IC701 (AN8839NSBE2):Servo Amp 81 20.3. IC702 (MN662790RSC):Servo Processor/Digital Signal Processor/Digital Filter/D/A converter 81 20.4. IC703 (AN8739SBE2):Focus Coil/Tracking Coil/Traverse Motor/SpindleMotor Drive 82 21 Replacement Parts
15、 List 83 22 Cabinet Parts Location 95 23 Mechanism Parts Location 97 24 CD Mechanism Parts Location 99 25 Packaging 100 CONTENTS Page Page 2 SA-AK48 RadioFans.CN 收音机爱 好者资料库 1. Turn off the power supply. Using a 10, 10W resistor, connect both ends of power supply capacitors (C571 - 574, 558) in order
16、 to discharge the voltage. 2. Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make sure that the consumed The protection circuitry may have operated if either of the following conditions are noticed: No so
17、und is heard when the power is switched 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 impedan
18、ce of the amplifier are used. If this occurs, follow the procedure outlines below: 1. Switch OFF the power. 2. Determine the cause of the problem and correct it. 3. Switch ON the power once again. Note: When the protection circuitry functions, the unit will not operate unless the power is first swit
19、ched OFF and ON again. current at 50Hz in NO SIGNAL mode should be shown below with respect to supply voltage 230/230-240V. Power supply voltageAC230V, 50HzAC230 - 240V, 50Hz Consumed currentLess than 250mALess than 250mA 1 Accessories 2 Before Repair 3 Protection Circuitry 3 SA-AK48 RadioFans.CN 收音
20、机爱 好者资料库 The laser diodes 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). 4.1. Handling the traverse deck (optical pi
21、ckup) 1. The traverse deck (optical pickup) is an extremely high- precision construction and must not be subjected to impact, excessive vibration, or other types of rough handling. 2. In order to prevent static electricity damage to the laser diode, use a short pin or similar tool to short the optic
22、al pickupsflexiblecircuitboardsaftertheyhavebeen disconnected from the main circuit board. 3. Handle the flexible circuit boards with care; excessive force could cause them to be broken. 4. Do not turn the pre-set variable resistor (for adjustment of the laser power); it has been adjusted at the fac
23、tory. (as shown in Fig.1) Fig.1 4.2. Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-atatic wrist strap to discharge the static electricity from your body. 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the optical pic
24、kup is placed, and ground the sheet. (sa shown in Fig.2) Fig.2 Caution: The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup) 4.3. Caution when Replacing the Traverse Deck The traverse deck
25、has a short point shorted with solder protect the laser diode against electrostatic breakbown. Be sure to removethesolderfromtheshortpointbeforemaking connections. CAUTION: THISPRODUCTUNTILIZESALASER.USEOF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURESOTHERTHANTHOSESPECIFIED HEREIN MAY RESULTI
26、N HAZARDOUSRADIATION EXPOSURE. 4 Handling Precautions for Traverse Deck 4 SA-AK48 5 Precaution of Laser Diode 5 SA-AK48 6 Location of Controls 6 SA-AK48 7 Location of Controls for Remote Control Transmitter 7 SA-AK48 This section describes procedures for checking the operation of the major printed c
27、ircuit boards and replacing the main components. For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required. 8.1. Checking for the main P.C.B. 8 Operation Checks and Component Replacement Procedures 8 SA-AK4
28、8 Check the main P.C.B. as shown below. 8.2. Disassembly for the CD changer assy (The CD changer unit can be removed until the tray base ornament would removed.) 8.2.1. Disassembly for the disc tray ornament Follow the (Step 1) - (Step 3) of item 8.1. 9 SA-AK48 8.2.2. Disassembly for the CD changer
29、unit Follow the (Step 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. 10 SA-AK48 8.3. Checking for the unit operational condition (Place the unit horizontally when loading the CD changer unit.) 8.3.1. Initial setting of CD unit Follow the (Step
30、 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. 11 SA-AK48 8.3.2. Checking for the CD servo P.C.B. The initial setting of CD unit must be completed. (Refer to the initia
31、l setting of CD unit in item 8.3.1.) Check the CD servo P.C.B. as shown below. 8.3.3. Checking for the FL P.C.B. and cassette mechanism control P.C.B. The initial setting of CD unit must be completed. (Refer to the initial setting of CD unit in item 8.3.1.) Check the FL P.C.B. and cassette mechanism
32、 control P.C.B. as shown below. 12 SA-AK48 8.3.4. Checking for the power supply P.C.B. The initial setting of CD unit must be completed. (Refer to the initial setting of CD unit in item 8.3.1.) Check the power supply P.C.B. as shown below. 8.4. Replacement for the traverse deck assy Follow the (Step
33、 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. 13 SA-AK48 14 SA-AK48 15 SA-AK48 8.5. Replacement for the disc tray Follow the (Step 1) - (Step 3) of item 8.1. Follow th
34、e disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. 16 SA-AK48 17 SA-AK48 8.6. Disassembly and reassembly for mechanism base drive unit Follow the (Step 1) - (Step 11) of item 8.1. Follow the disassembly instru
35、ction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. Follow the (Step 1) - (Step 9) of item 8.4. Follow the (Step 1) - (Step 11) of item 8.5. 18 SA-AK48 19 SA-AK48 20 SA-AK48 21 SA-AK48 22 SA-AK48 23 SA-AK48 8.7. Replacement for th
36、e motor assy Follow the (Step 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. Follow the (Step 1) - (Step 10) of item 8.5. 24 SA-AK48 8.8. Replacement for the pinch rolle
37、r assy and head block Follow the (Step 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. Follow the (Step 1) - (Step 3) of item 8.3.3. 25 SA-AK48 26 SA-AK48 8.9. Replacemen
38、t for the CD motor assy, capstan belt A, capstan belt B and winding belt Follow the (Step 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruction for the CD changer unit of item 8.2.2. Follow the (Step 1) - (Step 3) o
39、f item 8.3.3. Follow the (Step 1) - (Step 11) of item 8.8. 27 SA-AK48 28 SA-AK48 8.10. Replacement for the components parts on the mechanism P.C.B. Follow the (Step 1) - (Step 3) of item 8.1. Follow the disassembly instruction for the disc tray ornament of item 8.2.1. Follow the disassembly instruct
40、ion for the CD changer unit of item 8.2.2. Follow the (Step 1) - (Step 5) of item 8.3.3. Follow the (Step 1) - (Step 6) of item 8.8. 8.11. Replacement for the cassette lid assy Follow the (Step 1) - (Step 3) of item 8.1. 29 SA-AK48 8.12. Measure for tape trouble Follow the (Step 1) - (Step 3) of ite
41、m 8.1. 30 SA-AK48 9 Checking Procedure for Self-operation of Cassette Mechanism Assy This procedure describes simple methods independent of mechanism controller or governor circuit. 9.1. Operation Check Providing with Cassette Tape 1. Push up the EJECT lever with rubber band.(Refer to Fig. 2) 2. App
42、ly DC 5V to the MOTOR. (MOTOR will be rotated) (Refer to Fig. 1) 3. Provide the cassette tape with mechanism assy. 4. Apply DC 9V to the plunger, and then operate it by switching power ON/OFF. (Power: +PL, -PL) (Refer to Fig. 1) a. FWD PLAY : Supply power to the plunger momentary. (Duration: approx.
43、 50msec.) b. FWD FF : At FWD PLAY mode, supply power to the plunger momentary. (Duration: approx. 50msec.) c. STOP : At FWD FF mode, supply power to the plunger momentary. (Duration: approx. 50msec.) d. REV PLAY : At STOP mode, supply power to the plunger for ordinary duration. (Duration: approx. 20
44、0msec.) e. REV REW : At REV PLAY mode, supply power to the plunger momentary. (Duration: approx. 50msec.) f. STOP : At REV REW mode, supply power to the plunger momentary. (Duration: approx. 50msec.) Repeat the above operation to FWD PLAY mode. Note: Incorrect duration for power supply may be operat
45、ed to other mode. 9.1.1. Connection Diagram Between the Mechanism Assy and Power Supply (MOTOR and Plunger) Fig. 1 9.1.2. Detail View of EJECT Lever (EJECT lever fixed by rubber band, Plunger rib operation) Fig. 2 9.2. Operation Check Not Provided with Cassette Tape 1. Push up the EJECT lever with r
46、ubber band. (Refer to Fig. 2) 2. Apply DC 5V to the MOTOR. (MOTOR will be rotated) 3. Lift up the plunger rib of mechanism assy with the tip of minus screwdriver, and then operate it same as power supply duration. (Refer to Fig. 3) Note: Operation order is same as the “Operation Check Providing with
47、 Cassette Tape” item 4. above. Fig. 3 31 SA-AK48 G GSelf-Diagnostic display This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an error code corresponding to the problem. Use this function when performing maintenance on the unit. G GHow to set the
48、Self-Diagnostic Function G GCassette Mechanism Test (For error code H01, H02, H03, F01, F02) 1. Press “TAPE, DECK 1/2” to select Deck 2. 2. Load a cassette tape with the erasure prevention tab removed from the left side only and close the cassette holder. 3. Press “MEMORY” button. (FAST FORWARD shal
49、l be executed for 2 seconds, afterwhich it will STOP) 4. Load a cassette tape with the erasure prevention tab removed from the right side only and close the cassette holder. 5. Press“FMMODE/BP”button.(REWINDshallbe executed for 2 seconds, afterwhich it will STOP) 6. Load a pre-recorded tape with both reco
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