Toshiba ESTIA HWS-1501CSHM3-E, Service Manual

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SAFETY PRECAUTIONS
The unit and this service guide list very important safety precautions.
Understand the following details (indications and symbols) before reading the body text, and follow the instructions.
[About indication]
* Property damage indicates extended damage to property, furniture, livestock, or pets.
[About symbols]
Indication Meaning of Indication
DANGER
Indicates that a wrong operation may cause a service engineer and the third persons
around to get fatal or serious injuries.
WARNING
Indicates that a wrong operation may cause a service engineer and the third persons
around to get fatal or serious injuries, or that unit defective after the operation may cause
a user to have a similar serious accident.
CAUTION
Indicates that a wrong operation may cause a service engineer and the third persons
around to get injuries or may cause property damage*, or that unit defective after the
operation may cause a user to have a similar accident.
Symbols Meaning of Symbols
Indicates a forbidden action.
Specific forbidden actions are described in text near the symbol.
Indicates a forcible (must do) action.
Specific forcible actions are described in text near the symbol.
Indicates a caution (including danger and warning).
Specific cautions are described in picture or text inside or near the symbol.
DANGER
<Turn off the power breaker>
Turn off the power breaker before removing the front panel and cabinet.
• Failure to do so may cause a high voltage electric shock, leading to death or injury.
• During an operation, the second side circuit of high pressure transmission(*) are applied with a high voltage of 230V
or higher.
• Touching the circuit even with an electrical insulator, let alone a bare hand or body, causes an electric shock.
∗
: For details, see the schematic.
<Discharge between terminals>
When the front panel and cabinet are removed, make short-circuit current to discharge between high pressure
capacitor terminals.
• Failure to do so may cause a high voltage electric shock, leading to death or injury.
• After the power is turned off, the high pressure capacitor is still charged with high voltage.
<Forbidden>
Do not turn on the power breaker after removing the front panel cabinet.
• Failure to do so may cause a high voltage electric shock, leading to death or injury.
WARNING
<Check earth ground>
Before starting failure diagnosis or repair, check that the ground wire (
∗
) is connected to the unit ground terminal.
• An unconnected ground wire could cause an electric shock if electric leakage occurs.
• If the earth ground is not properly connected, ask an electrical worker for rework of the ground connection.
∗
: Ground wire of class D grounding