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Am/fm tuner no power

Main transformer has 120volts in primary & 29 volts in secondary no power to main display board/ no sound

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  • 161 Answers

Try changing the cable/transformer for a new one. you should be able to find a new cable online easily enough, or maybe a friend has one you could borrow.

Try a different power outlet.
Make sure your multi-plug (if you're using one) is functional.
Try plunging something that you know works, in the outlet, to see if you have power at that plug.

Isolate your power supply from the mains switchboard.
Switch off and Unplug your appliance from the wall socket before attempting any repairs.
It could be a fuse in the Tuner, replace the fuse for a new one.

Get your Multi-meter 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.
Equipment requirements:
A Multimeter (Digital or analogue) Set on a ohm scale or an insulation tester that also has a continuity scale.
A set of leads.

3: Polarity
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.
Equipment requirements:
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
Equipment requirements:
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.

Posted on Feb 11, 2014

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SOURCE: Stopped working

I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.

Posted on Jan 30, 2008

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SOURCE: Yamaha RX-V995 no power no audio [dead]

sounds like a short in the cpu of the unit

Posted on Mar 07, 2008

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SOURCE: Pioneer SX-2300 powers up, but no sound.

Does the output relay click about 5 sec. after powering on? If it does check if the tape2/tape monitor is on. Check speakers and wiring. Try headphones.

There aren't any fuses for the output.

If no relay then it probably needs output transistors and a few resistors.

Posted on Dec 17, 2009

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SOURCE: Amplifier is dead. Relay in

it is in auto protect mode, something wrong with your transistor/ic

Posted on Sep 22, 2010

welcomejee
  • 10594 Answers

SOURCE: ales@defence.gov.auTX-SR601/E (Australian version - 230vac)

Hi,
Since you already have service manual so please check page-25 schematics of U21 board and test Transformer T902, its standby power transformer that provides 13V supply to receiver at connector P931A and T902 would be open/ defective so no output volts for standby circuits and result is dead unit.
Below is as image of U21 schematics for better idea.
Hope this will help.
Thanks.

welcomejee_121.jpg

Posted on Jul 10, 2011

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Transformer Test Procedure:1). Make sure that transformer wire connections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow

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Tip

How to measure Voltage in Transformer for Fitness Treadmill


Transformer Test Procedure 1). Make sure that transformer wire connections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow.

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ERNESTO CUADRA

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