Yamaha AX396 HiFi Amplifier repair
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- Опубліковано 24 вер 2023
- Not something I normally do, but the church I was playing the organ at for a service yesterday had difficulty getting this 2001 amplifier to switch on.
I got the impression there would be a duff capacitor on the standy power suppy board. Upon opening it up, there is a single 330uF capacitor (25V) on the standby PCB. I changed the capacitor & was rewarded with the amplifier turning on properly.
Mr Chippie & I re-installed the amplifier back at church this afternoon, meaning their down-time was less than 24hrs.
Recorded 25th September 2023
Richard G0OJF
Richard 2E0FKC (Mr Chippie)
Lincolnshire, UK
(C) Tango Systems Group 2023 - Наука та технологія
Hiya Rick these are great amplifiers I had one for many years top video mate
Hi 👋 richard good luck on repairing the yamaha ax396 hifi amplifier from paul chapman at east sheen 73's
Thanks Paul,
Richard
I'm surprised you approve with it not being a CB radio..
Used to love my Leak Delta 70 amp.
new stuff nice
Easy as that! Job well done. Cheers
I can bet if the church had contacted the supplying A/V company, they would have been sold a new amplifier for £500.
Richard, UK
What? No Mr Chippie test?! I expected it to be tested on Scratchy Corner at least!!!! :)
Makes a change 😊
_"On this occasion"_ Lol!
Great Job Richard enjoyed that, looks a nice organ at your Church you play there Have you videoed it? Looking forward to the video on the Organ Maintenance Visit too!
North Rauceby church.
Richard
@@ukfmcbradioservicingTango21 ohhh!
Had the same problem but after fixing the bad cap (checked it with ESR meter) still no go, seems the standby transformer packed a sad, open in the primary. Sadly can't buy a replacement of the shelf where I live so not to give up on such a nice amp I fitted a 500ma 12.6v transformer to the back of the unit just under the power cord and after removing the dud unit wired the new one, all good 🙂 Bad caps seem to cause a bit of heat as I see some circuit board discoloration around the Darlington voltage regulator. Seems Yamaha just use the size of the output transistor case to remove heat rather than a heat sink so the heat looks like it migrates to the circuit board tracks. Anyway, thanks for the pointers to the fault (s).
You did the right thing to sort yours out.
Richard
Interesting the old cap metered ok on the peak tester but obviously defective
Yes, this is where a 1960's Heathkit LCR tester may well have shown a fault as they can apply voltage to check for internal insulation breakdown.
Richard
Do you fix guitar amplifier s Richard
Mr Chippie does. Email me. rshireby@yahoo.co.uk
Richard
I am having same model of yamaha amp , and has the same problem developed, please let me know what should i tell my technician to fix the problem?
In this instance it was just the electrolytic capacitor on the standby power supply board. However, all the electrolytic capacitors on the main power supply board are prone to failure & ideally should be replaced.
This was a situation where the standy power supply wouldn't come on & not a situation where the main power supply wouldn't come on....which is the usual case with these after 20 years.
Richard
Thankyou sir 😊👍@@ukfmcbradioservicingTango21