1 Before Use (Caution) 3
2 Before Repair and Adjustment 3
3 Protection Circuitry 3
4 Safety Precautions 4
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
6 Handling the Lead-free Solder 5
7 Precaution of Laser Diode 6
8 Cautions to be taken when handling Optical Pickup 7
9 Accessories 8
10 Operation Procedures 9
11 Disc information 11
12 About HighMAT 13
13 Optical Pickup Self-Diagnosis and Replacement Procedure 17
14 Self-Diagnosis Function 18
15 Cautions To Be Taken During Servicing 23
16 Disassembly and Assembly of Main Component 25
17 Checking for major P.C.Bs 59
18 Measurements and Adjustments 63
19 Block Diagram 66
20 Voltage Measurement 77
21 Schematic Diagram 78
22 Printed Circuit Board 105
23 Wiring Connection Diagram 117
24 Illustration of ICs, Transistors and Diodes 119
25 Terminal Function of IC 121
26 Parts Location and Replacement Parts List 123
CONTENTS
Page Page
1 Before Use (Caution)
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 117V or 120V, set to the “127V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5815, C5818, C9513, C9533, C9534, C9816 and C9817 through a
10Ω, 5W resistor to ground.
DO NOT SHORT-CIRCUIT 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 100/110V at 50/60 Hz & AC 240V at 50Hz in NO SIGNAL (vol. min, at CD mode) should be ~500mA
.
3 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 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 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.
3
