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Hello there I have a Yamaha p4500 power amp, its not turning on, when i took a look i found that theres a small transformer just where the mains connects to the circuit board, and it got one leg burned. Does anyone know what are the specifications for it so i can change it. Thank you

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

kimberleykid
  • 5 Answers

SOURCE: Channel short

Hi there, sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.

Posted on Aug 28, 2007

  • 236 Answers

SOURCE: Yamaha P4500 service manual

one thing for sure Yamaha will not turn their back on their customers for support. What they normally say is that you contact your nearest service center for assistance. But you know you have a very good chance of getting a copy of the service manual since this is a very old model. i have the same amp being used in our church and yamaha service Japan has sent me by postal mail. technology nowadays is much different so maybe they can even send you in pdf format.

Write them by postal mail :
Yamaha Corporation
A/V PA Service Department
10-1, Nakazawa-cho, Hamamatsu, 430-8650 Japan.

simply tell them you need the manual and you are doing the servicing on your own. No one in your area can help you with it.

anyway, what is wrong with your P4500, it's a good amp but sensitive. very good design, hard to troubleshoot if you're not familiar with Yamaha amps. The main parts you can not replace buying from a local store though you may get the same part numbers specially power/driver transistors. it always comes in complementary pair critically matched by tthe factory. i tell you don't get the replacement anywere but Yamaha only. Yamaha have made to order power transistors tailor made for this Amp. you'll find the same transistor number outside but when you plug the unit, it wont last and worst it bursts !!! be carefull. Very hard to scan a copy of manual for you, but if you dont get a reply from Japan you can email me and we'll try to find a way to send you a soft copy.

Reden (redrivera0314@yahoo.com)
Yamaha service from Saudi Arabia 1996-2001

Posted on Mar 19, 2008

robotek
  • 1512 Answers

SOURCE: Yamaha P-4500

Hi radek

If it is a toroidal,they have a nasty habit of going shorted turns on the primary. Is it blowing fuses? Let me know

robotek
ex In'gill ;)

Posted on Sep 12, 2008

  • 162 Answers

SOURCE: Yamaha p4500 protect lights do not go off at power up

You only normally get that when the Volume over peaks, and the amp will automatically cut out to prevent it fron blowing the whole P.A up.
If you know it was working fine before the wires were twisted together, then best try undoing what was done, and making sure that the Amp's Volume is turned down to minimum.

Posted on Dec 02, 2008

  • 4234 Answers

SOURCE: Yamaha rx-797 w/Yamaha ge-60 eq utilizing prein/main out ..and ad

It sounds like you want to use the external amp rather than the internal one. If that is the case, just connect the output of the EQ to the input of the external amp. All you are doing is inserting the EQ between the amp stages now. Using the mx-1 rather than the internal amp is no different.

Dan

Posted on Feb 25, 2009

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1 Answer

Power supply output for Yamaha p4500 secondary output for the power supply so that i could check the voltage


Hi Joel, although we've sourced detailed schematic for this P4500 amplifier, there are no many voltage details on it for manufactures sake. Anyway, mine findings are. Secondary winding on main transformer should supply no less than 2 x 75 volts which makes after rectifying and filtration no less than 2 x 90 volts on capacitors with amplifier without input signal. Also transformer has to be very "hard" , otherwise amp will start clipping before reaching stated wattage on output.

Oct 17, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Yamaha p4500 in protection mode


The manual says the heat sink is too hot or an unacceptable DC voltage was sensed going out.

http://www.retrevo.com/support/Yamaha-P4500-Amps-manual/id/962bh144/t/2/

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Oct 07, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Hi We have an Allen & Heath Mixing Desk connected to two Yamaha P4500 audio amplifiers (via graphic EQ and compressor/limiter) which power the 4 main and 4 side speakers in our church. We now want to...


'Splitting' leads is never the best way to distribute a signal. The best solution is to use the parallel inputs of the Yamahas to chain them together: mixer to amp1, amp1 to amp2, amp 2 to the Cloud. You should only need to use one input on the Cloud to drive all the channels, using the input switches at the rear.

Let me know if you need any clarification on this.

Sep 21, 2011 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Yamaha p4500 keeps blowing both ET5AH250V fuses help?


Suspect an overload in the power section, or more likely the main amp. A semi-conductor device is now acting like it was a piece of wire. Easy to spot with an ohm meter, it will just like you have touch the test probes together! My guess it will be one or more of the things on the big heatsink that's gone.

Jan 24, 2011 | Yamaha P4500 Power Amplifier 2-Channel

2 Answers

Shashij_2001@yahoo.com


TURN THE BALANCE CONTROL IN THE MIDLE

Jul 06, 2010 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

One channel does not receive signal as shown by the led.oudtput stage is perfect the amp is a Yamaha P4500 poer amp


Try reverse connecting the channels, in order to locate where is the problem; at the cables or at the amplifier.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
Please kindly rate this solution
Stelios

Mar 06, 2010 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

Yamaha p4500 protect lights do not go off at power up


You only normally get that when the Volume over peaks, and the amp will automatically cut out to prevent it fron blowing the whole P.A up.
If you know it was working fine before the wires were twisted together, then best try undoing what was done, and making sure that the Amp's Volume is turned down to minimum.

Dec 02, 2008 | Yamaha P4500 Power Amplifier 2-Channel

2 Answers

Yamaha P-4500


Hi radek

If it is a toroidal,they have a nasty habit of going shorted turns on the primary. Is it blowing fuses? Let me know

robotek
ex In'gill ;)

Sep 12, 2008 | Yamaha P4500 Power Amplifier 2-Channel

1 Answer

P4500 yamaha amp


first check your input cable-disconnect it and check if the problem finished---you will have a problem in input(cable or device)-start with another cable then your input device.
if the problem still check your out put cables(speakers cables)for short circuit or touch the bare wire with amplifier body.-try to clean volume controls with spray contact cleaner---confirm good connection in amplifier rear and in speakers rear.

Aug 25, 2008 | Yamaha P4500 Power Amplifier 2-Channel

3 Answers

Yamaha P4500 service manual


one thing for sure Yamaha will not turn their back on their customers for support. What they normally say is that you contact your nearest service center for assistance. But you know you have a very good chance of getting a copy of the service manual since this is a very old model. i have the same amp being used in our church and yamaha service Japan has sent me by postal mail. technology nowadays is much different so maybe they can even send you in pdf format.

Write them by postal mail :
Yamaha Corporation
A/V PA Service Department
10-1, Nakazawa-cho, Hamamatsu, 430-8650 Japan.

simply tell them you need the manual and you are doing the servicing on your own. No one in your area can help you with it.

anyway, what is wrong with your P4500, it's a good amp but sensitive. very good design, hard to troubleshoot if you're not familiar with Yamaha amps. The main parts you can not replace buying from a local store though you may get the same part numbers specially power/driver transistors. it always comes in complementary pair critically matched by tthe factory. i tell you don't get the replacement anywere but Yamaha only. Yamaha have made to order power transistors tailor made for this Amp. you'll find the same transistor number outside but when you plug the unit, it wont last and worst it bursts !!! be carefull. Very hard to scan a copy of manual for you, but if you dont get a reply from Japan you can email me and we'll try to find a way to send you a soft copy.

Reden (redrivera0314@yahoo.com)
Yamaha service from Saudi Arabia 1996-2001

Jan 28, 2008 | Yamaha P4500 Power Amplifier 2-Channel

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