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Power fault main relay clicking on & off no dc on outputs / have disconnected protection,fault still occurs. stop voltage from ic 950 pulsing .if standby board disconnected voltages ok - stop voltage 4.8v steady.goes to pin 47 of ic 102 also to q100 any suggestions ?

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You probably have shorted rectifiers and/or transistor(s) on standby board. Trouble-shoot rect bridge and cap. Feel stand by circuit transformer for abnormal heat, sure sign

Posted on May 01, 2008

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0helpful
1answer

Pioneer SX-950 will not power on/Protection relay works
well you were not clear on the power protection relay at all
and if tripped can never be ignored.

you meant i bet, power protection relay (fires off and activated)
that means these things, (the schematics are clear)
1:speakers shorted,or there wires, test with none !
2: output drivers Audio power amps are shorted, 1 or more.
this is seen as and ******* DC offset voltage to speakers and can wreck the speakers so it trips, saving lost of $$$$ speackers
this is how they all work AVR too .
to find it takes hard work on a beach, with the schematic
and testing each output driver for faults.
the manual shows the tests and good readings, at the driver.
some can trip for over voltage and overcurrent at the power amps.
moved you out of cars and trucks it is no CAR.
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Jan 11, 2023 • Pioneer Sx-950 Sx-850 Protection Board...
0helpful
2answers

The unit won"t power up

Please check the power supply to the unit, if the fuse or the main power is faultty. Now if the set has tripped then this can be a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

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Jul 06, 2011 • Coby Audio Players & Recorders
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1answer

I have a sony trinitron puchased 2001 after 911 standby light flashes constantly picture flashes off and on
Hello
Complete loss of horizontal oscillation and output is the trouble. To get it repaired you have to open your TV, Just look the horizontal driver transformer, a small transformer fitted on the main board very near to the line output transformer [LOT] for winding opened. If its primary winding gets opend, even though the horizontal oscillator section works, the pulses will not reach the horizontal output trnasistor, which drive the above said LOT, and the fault you describes will occur. Check the main secondary regulated supply voltage [140VDC] also. If this voltage is missing, check the reason and follo the supply rail print from the SMPS power supply reguator section.
Check the low voltage regulator IC, usually 7808 or 7812, which can be located on the main board, which supplies 8VDC or 12VDC to the ICs on the main board. Anyway, there is no horizontal output fuction in your tV. and try to find it. If you wants furthermore assistance, feel free to get me through Fixya. OK.
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Jan 01, 2011 • Sony FD Trinitron WEGA KV-34HS420 34" TV
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1answer

Red light flashes - will not work - could it be dust in the amp?
hi,
its not because of dust. AZUR 640A offers loudspeaker protection if the output of the amplifier goes to a high constant voltage (DC) because of some internal fault. This is a rare fault although detecting it could just save those expensive loudspeakers.
Due to the necessary sensitivity of the DC protection circuit, hard clipping of the amplifier may cause DC protection to be triggered. If this fault occurs switch the unit off, power up again and check
operation with a reduced volume level. If the DC fault occurs again contact your dealer for service.
ok
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Dec 29, 2010 • Cambridge Audio Azur 640A Amplifier
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1answer

Sony STR-DE475 receiver ''protect'' problem
The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.
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Jul 01, 2010 • Audio Players & Recorders
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2answers

Htr 5630 shut off in 2 sec.
Sounds like you have a bad amp IC or transistors.
When these go bad they almost always put roughly 40 volts dc from the amp power supply to the speaker terminals. The protection circuit senses this dangerous (to your speakers) dc voltage and disconnects the speaker terminals from the amp via internal relays (the ones you hear click) and puts it into protect mode. If it didn't the dc voltage would quickly toast the voice coils of the connected speaker.

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Apr 18, 2010 • Yamaha HTR-6130 Receiver
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1answer

Power seems to cut in and out - it 'clicks'and a second red light comes on - most of the time just one red light is on. Thanks
The click you hear is most likely the speaker protection circuit relay due to the protection circuits being triggered. In the event of a dc voltage appearing across the speakers the protection circuit isolates the the speaker terminals from the output stage.
Dry joints on the relay is not uncommon and causes false triggering. Check both pos' and neg' supplies are present at the output transistors / ic. Connect a dc volt meter across the speaker output terminals if a voltage of more than a few millivolts appears just before relay clicks then check the ouput stage for dry joints, leaky transistors and resistors having increased in value.
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Mar 05, 2010 • Audio Players & Recorders
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1answer

I don't get any front display or any sound when turned on.
Do you hear any clicks? If not, the standby transformer or related circuitry is bad. If you hear 1 relay click...the audio output section is most likely the problem. The first click you hear is the main power relay...and should see display.. the second relay click is the protection circuit relay engaging to let audio to your speakers...if the second click is not heard (it should occur in 3 to 5 seconds) there are shorted output transistors or a shorted output IC trying to blow your speakers with 50 to 75 volts dc. The protection circuit monitors the speaker lines for voltage. They should always read milli-volts only...not even 1 volt.Anyway, good luck
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Sep 24, 2009 • Sony STR-DE525
2helpful
2answers

SX-950 Stereo Pioneer Receiver
The relay is a protection device for the speakers. It will shut off the speakers when problems are detected internally. I would suspect that some of the capacitors in the front end are in need of replacing. This is a common item for units this old. I have restored a number of these for customers over the years with much success. Figure about $15-$20 in parts for this repair plus the local labor rate. This unit is definately worth a refurb. What happens is that there is dsome DC voltage being leaked into the final amplification stage. This triggers the protection circuit to shut off the speakers. DC voltage on a speaker will heat up the coil and eventually destroy the speaker.
Dan
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Apr 02, 2008 • Audio Players & Recorders
1helpful
1answer

Possibly bad audio amp ic
You'll need a voltmeter. Check for the absence of DC voltage at the amp ic's outpit pins under no signal conditions. Note, you need to check the output pins of the ic, not at the speaker terminals, as a relay would lift the speakers off circuit in the event of a DC potential being present at outputs, to protect speakers.
Jango
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Mar 16, 2008 • JVC HX-D7 Shelf System
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