Q
QQ
QGENERAL
Power supply
(E,EG) AC 230-240V, 50 Hz
(EB) AC 230, 50 Hz
Power consumption 170 W
Power consumption in standby mode
0.4 W
Dimensions (W x H x D) 250 x 332 x 316 mm
Mass 8.2 kg
Q
QQ
QSYSTEM
SC-AK22 (E) Music Center: SA-AK22 (E)
1 Before Repair and Adjustment 2
2 Protection Circuitry 2
3 Accessories 3
4 Handling Precautions For Traverse Deck 4
5 Precaution of Laser Diode 5
6 Caution for AC Mains Lead 6
7 Operation Procedures 7
8 Disassembly and Main Component Replacement Procedures
9
9 Self-Diagnostic Function 19
10 Description of Error Code 20
Speaker: SB-AK22 (E)
SC-AK22 (EB) Music Center: SA-AK22 (EB)
Speaker: SB-AK22 (E)
SC-AK22 (EG) Music Center: SA-AK22 (EG)
Speaker: SB-AK22 (E)
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.
11 CD Test Mode Function 21
12 Measurements and Adjustments 21
13 Illustration of IC’s, Transistors and Diodes 24
14 Terminal Function of IC’s 25
15 Block Diagram 29
16 Schematic Diagram 35
17 Printed Circuit Board 48
18 Wiring Connection Diagram 59
19 Troubleshooting Guide 60
20 Parts Location and Replacement Parts List 61
CONTENTS
Page Page
1 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C536, C545, C546 through a 10 Ω, 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 230 V, 50 Hz in NO SIGNAL mode should be ~400mA.
2 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.
2
A-AK22
