Yamaha m4

I have a yamaha m4 I took the cover off to clean it and when it is on I moved the 2 big caps when i moved them back and four they made poping sound . If dont move them its fine..is that ok? thank you.

rocky131309-07-2022 3:56pm

5 responses Add your response

noromance Details Discussions Posts This discussion Message User 9,769 posts 09-07-2022 at 10:42pm Copy Comment URL Report Comment Edit Delete Doesn’t sound great, does it? Either the caps' connections are intermittent internally or the solder joints to the board are dried out.
stereo5 Details Discussions Posts This discussion Message User 6,385 posts 09-07-2022 at 11:49pm Copy Comment URL Report Comment Edit Delete Why were you cleaning the inside of your amp with the power on? That is a recipe for disaster.
crustycoot Details Discussions Posts This discussion Message User 643 posts 09-08-2022 at 01:53am Copy Comment URL Report Comment Edit Delete He didn’t say the amp was on nor whether the popping sound was from the amp itself or from the speakers. I’m getting that it was from the amp and indicates deteriorating solder joints at the pcb. Whether the caps are good or not needs to be evaluated by a professional. The M4 was sold around 1980. I put a few out into the world back then. Nice piece.
crustycoot Details Discussions Posts This discussion Message User 643 posts 09-08-2022 at 01:55am Copy Comment URL Report Comment Edit Delete Sorry. Reading again the story seems to be the same…bad solder or bad caps.
dekay Details Discussions Posts This discussion Message User 5,556 posts 09-09-2022 at 02:03am Copy Comment URL Report Comment Edit Delete I would assume that "flexing" a sizable circuit board on a powered up 40+ year old amp would create such noises. Hopefully no serious damage was done, but doing so was certainly not an upgrade. DeKay

Log in to respond

More to discover

B&W (Bowers & Wilkins) 801D4

Aurender N100H

Ayon Audio S-10 II Signature Network Player DAC Preamp

AWARD WINNING - REMARKABLE!