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Joined: Nov 2021
Posts: 11
Junior Member
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OP
Junior Member
Joined: Nov 2021
Posts: 11 |
Hello there!
I just obtained a beautiful keyboard, but it has a pretty serious issue. It powers on, but there is no sound, not from the keys, the metronome or the includes songs. The internal amplifier works as I can plug a guitar into the INPUT jack on the back and the guitar comes out great. The output and headphone jacks produce no sound either. All of the buttons are responsive.m, e.g. lights go on then a different voice is selected.
Does anyone have any ideas where the culprit might be? Thanks.
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Joined: Nov 2009
Posts: 4,115
4000 Post Club Member
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4000 Post Club Member
Joined: Nov 2009
Posts: 4,115 |
Open it up, if you're lucky something obvious will be visible, loose or disconnected wire, blown capacitor, charring or other damage such as lifted track or obvious dry joint. Maybe even a battery cell that can be replaced. Otherwise, you need a scope and multimeter and circuit diagram to go with some electronics knowledge to perform troubleshooting. Taking it to a repair shop may cost more than it's worth compared to equivalent new.
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Joined: Nov 2004
Posts: 247
Full Member
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Full Member
Joined: Nov 2004
Posts: 247 |
Did you check the local on/off switch on the back?
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Pro-TAC tuning and repair service.
pro-tac.jpn.org/
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Joined: Nov 2021
Posts: 11
Junior Member
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OP
Junior Member
Joined: Nov 2021
Posts: 11 |
Yes, that's one of the first things I've checked.
The keyboard is opened up, but I haven't checked everything thoroughly yet
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Joined: Nov 2019
Posts: 236
Full Member
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Full Member
Joined: Nov 2019
Posts: 236 |
Yes, that's one of the first things I've checked.
The keyboard is opened up, but I haven't checked everything thoroughly yet You might want to have a look at this thread: https://www.justanswer.com/electron...and-hp-2900g-digital-piano-turns-no.htmlGood luck!
Peter
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Yamaha U1 (sold) / Kawai CS11 / Kawai ES-120 / Hammond XK-3c
Working on: PCA Beginner Course and
Tim Richards - Improvising Blues Piano
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Joined: Nov 2021
Posts: 11
Junior Member
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OP
Junior Member
Joined: Nov 2021
Posts: 11 |
Thanks! I did actually go over that thread already, that's how I knew to check that the internal amp was workint. Unfortunately, the thread peters out once the person seeking assistance changes what is wrong and no answer is ever provided
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Joined: Nov 2019
Posts: 236
Full Member
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Full Member
Joined: Nov 2019
Posts: 236 |
Thanks! I did actually go over that thread already, that's how I knew to check that the internal amp was workint. Unfortunately, the thread peters out once the person seeking assistance changes what is wrong and no answer is ever provided Ok. Didn't check it all the way... :/(
Peter
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Yamaha U1 (sold) / Kawai CS11 / Kawai ES-120 / Hammond XK-3c
Working on: PCA Beginner Course and
Tim Richards - Improvising Blues Piano
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Joined: Nov 2004
Posts: 247
Full Member
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Full Member
Joined: Nov 2004
Posts: 247 |
I don't have a 2900 service manual, but I have HP2700 manual .The master volume control is controlled by VCA circuit , so it may be broken or there may be a problem with the volume fader. If the output of the DAC is normal, I guess it's a VCA circuit.
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Pro-TAC tuning and repair service.
pro-tac.jpn.org/
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Joined: Nov 2021
Posts: 11
Junior Member
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OP
Junior Member
Joined: Nov 2021
Posts: 11 |
The volume slider seems to work. With the shielding removed from the mainboard, there is a slight buzzing which is affected by the volume slider
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Joined: Nov 2004
Posts: 247
Full Member
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Full Member
Joined: Nov 2004
Posts: 247 |
If there is no rhythm or metronome sound, then the main volume VCA instead of the DAC Is suspicious.There may be a sound if you bypass the main volume
--------------------------------------
Pro-TAC tuning and repair service.
pro-tac.jpn.org/
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Joined: Nov 2021
Posts: 11
Junior Member
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OP
Junior Member
Joined: Nov 2021
Posts: 11 |
Is your repair manual a physical or digital copy?
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Joined: Nov 2004
Posts: 247
Full Member
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Full Member
Joined: Nov 2004
Posts: 247 |
The service manual is following URL. https://www.synthxl.com/hp-2700/Good luck.( ^ω^ )
--------------------------------------
Pro-TAC tuning and repair service.
pro-tac.jpn.org/
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