Search found 8 matches

by melbournesurprise
Mon May 30, 2011 9:30 am
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Hello again! Not surprisingly, the problem's reared its head again. This time it fails much quicker, within 5 seconds, and there's no real way to 'trick' it into working again. I took waveterm's advice and looked for AC voltage (should have thought of this earlier!), and sure enough, there's about 1...
by melbournesurprise
Wed Apr 20, 2011 12:14 pm
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Okay, so over the last two days, I've been able to leave the keyboard on for extended periods with no faults whatsoever. I haven't touched or have needed to touch any of the grounding points I mentioned. Rhino: your point is well taken, if anything I've stumbled unwittingly on a "fix" (which may not...
by melbournesurprise
Tue Apr 19, 2011 6:30 am
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Well, things keep getting stranger. I was poking around trying to make sure it was the IC before I went about ordering another one. Underneath the green PCB containing the troublesome IC sits a metal foil-like sticker which acts as a ground. Usually the PCB is seperated from this ground by plastic l...
by melbournesurprise
Mon Apr 18, 2011 1:34 pm
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Good news! I was pointed towards the green board ("G") by a synth repairman, as he was certain board "F" generated the tones. I noticed one of the ICs (large one second from bottom left on G) was unusually hot to the touch, and became warmer as the synth was left on, to the point of uncomfortable he...
by melbournesurprise
Mon Apr 18, 2011 2:08 am
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Thomas: the power supply/transformer is all internal, in my earlier posts you'll see some simple tests I've done on the power supply, everything appears okay. Powering off the unit cuts off any sound playing, almost immediately. And yes, all my friends are telling me to just quit. Not yet :D Rhino: ...
by melbournesurprise
Sun Apr 17, 2011 5:02 pm
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Thanks all for the help so far. Some more info which may help... at the point which the keyboard "dies" (anywhere from a few seconds to a minute, depending on how long the keyboard has been powered off for, as above): - Whatever sound playing at the time the keyboard dies is left fading out in the s...
by melbournesurprise
Fri Apr 15, 2011 8:29 am
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Re: Roland Keyboard Works for 50 seconds... then dies

Thanks for all the help so far. Note that my electronics knowledge is basic (I mucked around with kits when I was younger) so I may have gone about the following the wrong way... This is the power supply: http://photos-f.ak.fbcdn.net/hphotos-ak-ash4/215782_10100237088535051_58003016_55427732_5067556...
by melbournesurprise
Wed Apr 13, 2011 2:27 pm
Forum: HELP!
Topic: Roland Keyboard Works for 50 seconds... then dies
Replies: 26
Views: 3898

Roland Keyboard Works for 50 seconds... then dies

Hello, I have a problem that hopefully users of older KBs/synths can shed some light on. I have an Roland HP-300 Piano Plus Keyboard. I bought it used, but I reckon it's at least 20 years old. The current problem appeared suddenly over the last two days. Once I turn it on, I can play it for around 5...