Question about Pioneer Audio & Video Receivers
HOWDY, NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S. SUCCES ! AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER
HOWDY, NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.
SUCCES ! AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER
Posted on Oct 23, 2007
The AMP-ERR message in many Pioneer Receivers is caused by some DC in the output. The microprocessor then issues the warning and shuts the unit off. It is definitely not a relay switch. It could be the amplifier power pack, i.e. PAC011A or similar that is faulty or something else. Not easy to repair for the non- experienced DIY.
Posted on Apr 24, 2009
If the speaker is not blown, there must be an output capacitor. If no output capacitor, and you have a blown transistor the speaker will blow from DC current. You can further check the transistors with a multimeter. A transistor looks like 2 diodes and you should be abobe to test with a mulimenter like a diode test.
Posted on May 12, 2009
I must agree that if the fuses are open and you replace them that your problem maybe fixed. If you can remove the fuse, I recommend taking it to a RadioShack and see if someone there can figure out what it is. I am going to assume that the fuse should be a 250 V. If you can find one that matches the same appearance, go with the smallest aperage rating you can find. Go with this route only if the person can not tell you exactly what it is you need. Be sure to match the type of fuse if you can see inside it like in the case of a glass fuse. Some are slow-blow fuses and some are fast-blow. If you are uncertain your safest bet is to use a fast-blow with a real low amp rating for the voltage you are using. If the amp rating is too low, it may run fine at lower volumes and pop when you turn it up. If I could physically see the fuse, I would probably be able to tell you what it was and what you needed to replace it with.
Posted on Jun 06, 2009
Most likely it needs one of the output ICs. But check for cold solder rings on the ground connections of the input board. Est. for it to be repaired $100-$120
Posted on Dec 17, 2009
It should be a push pull. The fact that you have negative voltage almost certainly means push pull. One side will be constructed using NPN transistors ran off the positive DC rail and the other side will be constructed using PNP transistors ran off the negative rail. I don't know the age of your amp but I know pioneer now uses integrated amp modules instead of discrete transistors.
example of integrated amp module (sorry for the chinese)
Posted on Feb 11, 2010
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Mar 19, 2016 | Pioneer VSX-D457 Receiver
Without a Sams Photofact or a service manual I would go directly to the Power IC which is the largest Integrated Circuit mounted to a large heat sink. If you see any fuses they are probably for the power supply since any fused circuit on the speaker output would be ineffective because the IC would be damaged before the fuse would blow, but you need to check them anyway. Since the short was at the speaker output your problem should be at the final stage of amplification, which is the Power Amp IC. Prior to the early 70's you would have transistors mounted to a heat sink which could be individually checked and replaced. Then manufactures started to use the Power Amp IC which are more costly but eliminate having to find matched pair transistors. All you can check on the Power Amp IC is if you have an input using an oscilloscope or signal tracer and the power to the IC. If you have an input signal and power to the device with no output, I would replace the IC. Unless you have a test circuit for the IC you cannot test it completely unless you have a device like a Huntron Tracker or build a test circuit using a signal generator and a power supply to measure the gain of the IC with an oscilloscope. Short of ordering a service manual this is a good place to start.
Aug 15, 2011 | Audio & Video Receivers
A little more triage would be in order before you take a knife to it. What source(s) produce the distorted sound? How about test tones? Same? It's sick. Not same? Something else is going on. Have you referred to the manual(s)?
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