Table of Contents
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CONTENTS
1 Before Use (Caution)
2 Before Repair and Adjustment
3 Protection Circuitry
4 Safety Precautions
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
6 Handling the Lead-free Solder
7 Precaution of Laser Diode
8 Cautions to be taken when handling Optical Pickup
9 Accessories
10 Operation Procedures
11 Disc information
12 About HighMAT
13 Optical Pickup Self-Diagnosis and Replacement Procedure 17
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
10 , 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.
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14 Self-Diagnosis Function
3
15 Cautions To Be Taken During Servicing
3
16 Disassembly and Assembly of Main Component
4
17 Checking for major P.C.Bs
18 Measurements and Adjustments
5
19 Block Diagram
5
20 Voltage Measurement
6
21 Schematic Diagram
7
22 Printed Circuit Board
8
23 Wiring Connection Diagram
9
24 Illustration of ICs, Transistors and Diodes
11
25 Terminal Function of IC
13
26 Parts Location and Replacement Parts List
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