Check your power cord and power supply, check the plug is clean and free from corrosion or dirt.
Plug another appliance into the same socket to check there is power at the socket.
Note: Electricity can cause serious injury even Death.
Isolate your power supply from the mains switchboard.
Switch off and Unplug your appliance from the wall socket before attempting any repairs.
If its still under warranty, take it back to the store or manufacturer for replacement.
Call a serviceman to test the appliance for you,
If not you could...
Check your fuse in the device, you will have to dismantle the appliance.
Get your Multimeter and do some tests...
Test the flexible cord connections
Electrical tests included, visual inspection, Earth continuity, Polarity and Insulation resistance.
Examining cord for Damage
Disconnect flexible cord from power supply.
Check cord along the whole length for obvious damage
1: Visual Inspection
A visual test is necessary before using test instruments to ensure that all specific safety requirements are meet.
Check the general condition and safety of the cord, plug, cord anchorage, terminations and of the appliance itself.
2: Earth Continuity.
The earthing system of an electrical installation must be installed in a manner that will allow circuit protection devices to operate if there is a fault between live parts (other than Neutral) and the mass of earth.
What to check: For class (one) 1 protectively earthed appliances only, test for very low resistance between exposed appliance metalwork and the earth pin of the plug. this resistance should be as low as possible and must not exceed 1 ohm. Note: the Exposed metal parts of a class 2 double-insulated appliance must not be earthed.
A Multimeter (Digital or analogue) Set on a ohm scale or an insulation tester that also has a continuity scale.
A set of leads.
Why is this test necessary:
An incorrect connection of phase and neutral conductors to fittings and appliances is extremely dangerous and has been the cause, either directly or indirectly of many shocks and fatalities.
What to check:
Polarity tests are carried out to ensure that every single-pole switch operates in the active conductor or the circuit in which it is connected.
A Multimeter (Digital or analogue) Set on the resistance scale when the SUPPLY is NOT connected.
or a voltage indicator set on a suitable voltage rating when the supply is not connected.
4: Insulation Resistance
Why this test is necessary:
All live conductors (including Neutrals) and live parts must be insulated to prevent - Electric shock hazards from inadvertent contact.
- Fire hazards and equipment damage from short circuits.
What to check:
Insulation resistance tests must be made between:
- Active conductors of a poly-phase circuit
- Active and Neutral
- Active and Earth
- Neutral and Earth
The insulation resistance between appropriate components shall be not less than 1 mega-ohm minimum
An insulation resistance tester which maintains an output of 500 volts when loaded with a 1 mega-ohm resistance.
A set of leads.
Different countries adhere to spicific Electrical (safety) Regulations and standards
This information is only intended to enlighten the novice, guide and remind someone already in the field of electrical installations.
DO NOT attempt any electrical repairs unless you have the appropriate background or training.
Jun 11, 2013 |
Yamaha RX-V757 Receiver