Yamaha PF80 (Electronic Piano) speaker issue

ClintBarton

Hi,

I have a Yamaha PF80 Electronic Piano from 1985. Today I found out that the right speaker didn't work. While trouble shooting I plugged in some headphones and the right headphone doesn't work either. I have tried changing the speaker balance but that didn't work. In fact when I move the balance all the way to the right, the left speaker gets louder. That may reveal something? This may or may not be the cause of the issue, but I opened it up to clean it up and may have put it back together wrong?  But I barely took anything apart. I did take the actual keyboard
out which meant taking a number of screws out but I can't
see how that would effect the speakers.
Any ideas would be appreciated.

Please help.

I didn't find the right solution from the Internet.

References:-
https://yamahamusicians.com/forum/viewtopic.php?t=4486
Motion Infographic Animation Company

Thanks!

乐龙

May be the volume fader broken. Try to change it.

hdchina

老款电钢琴pf80,1985年生产，距今30多年的历史，现在右侧一侧线路输出及右侧扬声器均不能发声，这种情况下可以考虑检查运放芯片的工作状态，时间长了，查看一下相关焊点是否虚接了，也是必要的检查步骤。在论坛混这么多年了，第一次回复英文帖子~有点儿意思，看看有没有后续回应反馈情况吧。

夫夫

乐龙 发表于 2018-7-3 23:35
May be the volume fader broken. Try to change it.

我靠 李老师英文这么厉害啊

乐龙

夫夫老师过奖了！只是生搬硬套（可能不够规范地道），希望外国朋友能大致理解。如表达有误，欢迎夫夫老师及论坛朋友i纠正（我要表达的是：有可能音量推子损坏，试下把它换掉）

66cccfff

乐龙 发表于 2018-7-3 23:35
May be the volume fader broken. Try to change it.

It is also plausible that the problem lies in one of the operational amplifiers in the output section…

MMMMMM

哈哈，我在看天书。