Roland BA-330 schematic

[MarkusBass]

I'm looking for schematic of Roland BA-330 portable amplifier. On one input after 30 minutes the signal gets distored.

Mark

[paleeman]

Hello Mark.

The complete manual is larger than 20Mb. I can e-mail it to you.

[MarkusBass]

Yes, please. I sent you PM with my email address.

Mark

[paleeman]

Mark, I sent it

Jazz, I receive this message, when I am sending it to you:

Delivery to the following recipient failed permanently:

XXXXXXXX@verizon.net

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain verizon.net by relay.verizon.net. [206.46.232.11].

The error that the other server returned was:
552 5.2.3 Message exceeds local size limit.

[patlaw]

You can upload the file to Ge.tt | Gett sharing (or many other sites) and post the link here for all to download. The file is too large for most email services.

[Jazz P Bass]

If the file is not 'copy protected', I use either "Cute PDF Writer" or "Bullzip".
You can 'print' selected paged to a pdf file.
Great for breaking down huge files.

[sygenics]

Hi everyone

new here and whilst I don't like asking for stuff as a first post I am in need of the schematic for the BA330. Actually just the psu/amplifier sections. anyone have and willing to help?

Thanks

Syg

[Jazz P Bass]

Here is the PSU & Amp schematic.

Roland BA-330 Pwr Sup & Amp Bd.pdf

[sygenics]

Here is the PSU & Amp schematic.

[ATTACH]34619[/ATTACH]

Awesome!! Thank you so much
wow that psu is appears too complicated for what it is!
time to get it on the bench and fix this bad boy...

[sma1033]

Just download the schematic file and compared it with my BA-330 Circuit Board, It helps a lot for my BA-330 modification project.
really appreciate it.

[MarkusBass]

I forgot to mention that I fixed the amp. As far as I remember the problem was caused by cold solder joint at one of electrolytic capacitors in the preamp. Big thank you to paleeman. Without him I wouldn't be able to find the problem.

Mark

[sma1033]

Does anyone have BA-330 full schematics ? (Other than Ps & Amp Bd)

I am still looking for full schematics for my BA-330 power upgrade project.

Appreciate for the help.

[Jazz P Bass]

Here is what I have.

[J M Fahey]

Just thinking aloud: if you want to "power upgrade an amp", surely the power amp and power supply schematics should be enough?
Am I missing something here?

In any case, *in general* it's not practical to do that because you'll need a larger power transformer, more filtering, more/better output devices but specially, and this is usually the bottleneck, better heatsinking.

You might do this in a combo amp, because they are large, size is dictated by speakers rather than electronics, there is ample air flow and you can bolt extra heat sinks under the chassis but heads in general are tightly packed .

Best is to add external power, and if you need to keep it compact, you may build powered cabinets, then add as many as you want, the Sky is the limit.

[sma1033]

the only bottle neck here i guess is heat dissipation for my amp circuit board.

However, TI's Class-D IC TAS5630 is impressively high efficiency.

I tried running my TAS5630 amp board under output power less than 100W, the temperature of heat sink is almost equal ambient temperature (25 deg. C)

I guess It should have no problem to make ouput less than 100 watt.

But, heat sink cooling under high output power (more than 300 Watt) is a problem as expect.

I am still thinking if i need to make a hole on cabinet to let air flow under high output condition.