Question about Yamaha Audio Players & Recorders
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Posted on Jan 02, 2017
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
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 :
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.
Yamaha service from Saudi Arabia 1996-2001
Posted on Mar 19, 2008
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
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.
Posted on Feb 25, 2009
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