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5
1.3.
Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors for :
Main Unit (SU-ZT1)
(C5501, C5502, C5509) through a 10
Main Unit (SU-ZT1)
(C5501, C5502, C5509) through a 10
Ω, 1W 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.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
• Current consumption at AC 220-240 V, 50 Hz in NO SIGNAL mode should be 200~800 mA (GN).
• Current consumption at AC 110-240 V, 50/60 Hz in NO SIGNAL mode should be 200~800 mA (GS).
• Current consumption at AC 110-240 V, 50/60 Hz in NO SIGNAL mode should be 200~800 mA (GS).
Speaker Unit (SB-ZT1)
(C5700, C5701, C5703, C5704) through a 10
(C5700, C5701, C5703, C5704) through a 10
Ω, 1W 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.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
• Current consumption at AC 220-240 V, 50 Hz in NO SIGNAL mode should be 100~800 mA (GN).
• Current consumption at AC 110-240 V, 50/60 Hz in NO SIGNAL mode should be 100~800 mA (GS).
• Current consumption at AC 110-240 V, 50/60 Hz in NO SIGNAL mode should be 100~800 mA (GS).
1.4.
Caution for Fuse Replacement
Main Unit:
(SU-ZT1GN)
(SU-ZT1GN)
(SU-ZT1GS)
Speaker Unit (SB-ZT1)
1.5.
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.
• 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:
"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.
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.
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.6.
Safety Part Information
Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the
original design without permission of manufacturer.
These parts are marked by in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the
original design without permission of manufacturer.
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