I have an old Sears Galaxy Organ. Sound comes out but there is no volume control. How do I fix and how do you take the bottom panel off to get to the Pedal
The main thing to keep in mind here is that the cpu and logic circuits in this organ run off 5v and the amplifiers (opamp ects) work off +-15v and as the logic part of the organ appears to works I would ignore that at the moment. What I would do is find IC52 (its a dual opamp that drives to aux outs) and first make sure that both +15v and -15v rails are good. To do this check from ground to pin 4 and from ground to pin 8 or you could measure across both pin 4 and 8 but then we will be looking for near to 30v. If these rails are good I would then crack out the oscilloscope and check for input to the opamp on pins 6 and 2. When a note is played a wave form should be present on the scope if not the I would go to the DAC IC34. I would check the outputs of the opamp (IC45 pins 1 and 7) being driven by the DAC just in case the DAC output is very low hence the opamp buffers. This should shed some light on the issue and give you a idea were the problem is. My money is on a lost voltage rail or shorted opamp. A good trick for finding shorted opamps is to make sure the rails are good and wait for a few minutes until the offending opamp gets hot. Remember the first point of troubleshooting is to check voltages.
Yep, thanks :o) We actually did a live show on my other channel and we've found that the the bridge recifiers on the 15v rail are dead. Waiting for new diodes to arrive to replace, hopefully that will fix it and nothing has caused them to pop further along. There will be a follow up video either way :o)
Nice looking bit of kit! Recently picked up a Hammomd T-212 here that needs some TLC (scratchy drawbars mainly), then need to figure out how to get all 100+ Kg of it upstairs...
Hi I have an ME-50 and everything seems to work except the lower keyboard has an issue regarding continuity. When I press a key and hold it then play the next key, the sound from the first key is played on the second key. Does that make sense. I think I have to go three notes down or up before the note value changes. Any suggestions. Sound seems to be OK, although sometimes a bit crackly and the bottom and top keys on the lower keyboard only work when. pressed very hard. Suggestions? Ideas? Also any UA-cam channels for learning organ online. Thanks in advance.
take the gas pedal out of the circuit and it sould play at full blast. I tried this on a late model hammond solid state I chopped though but if the yahama works the same using an exciter lamp it sould give you the same end result Its worth a try
My yamaha el900 rhythms reverb is heard only. Its volume is decreased or increased as i change reverb slider, but echo remains the same. Sounds heard as lot of reverbed. Setting level to min just mutes the speakers. Any ideas? Some days ago, pedal sounds also has started doing same :(
There are 3 or 4 CPUs in this though, and three separate DACs + PWM, so if there's no sound at all, then my money is on a PSU fault (missing supply), as it looks like at least a few of the CPUs are running. I don't think this version uses a light bulb for the expression pedal, as it doesn't have any power output on the sockets for it. The main expression pedal input does take audio, but it mixes it with the rhythm stuff, so the pedal would likely only be for the main melody sound. In other words, if there are no sounds even from the rhythm sections, then it's unlikely to be the pedal. EDIT: The user manual shows the main pedals socket as a multi-pin Mini DIN, but the expression pedal just loops the melody sound back in I think? (Most of the other expression / after touch sensors use pots or resistive wires, and are handled digitally, so are also unlikely to stop all sounds working, especially from the rhythm parts.) There is a small drive amp for the reverb / spring unit as well, but that also just mixes back into the main audio, so wouldn't stop it working altogether. If you have a synth / keyboard / PC with MIDI-IN on it, you could try hooking up to the Electone to see if it's outputting any MIDI note signals. If not, then it could point to a Master CPU fault.
Hi, i have got offered a Clavinova YP-40 with no sound for not such a bad price. do you have any hints of what can i expect in the worst of the cases or if is somhow probable that i can face the point of not being at all able to get it to sound?
I have an HS-8. A couple of the pedals I can't get a sound out of and the pedals themselves are a bit stiff, otherwise they are not broken. I bought the organ 2nd hand so could the pedals or their contacts just be in need of a good clean?
unplug the machine drain power take the back cover off check the pedals for continuity. clean the contacts. check the wiring harnice linking the pedalboard to the IO is pluged in all the way and check all the ICs are seeted firmly dust off the boards with a air compressor or vacuum while you are in there
@least 10' of this video could quite comfortably be edited out and discarded without harming any animals during the process of making this masterpiece of a movie! seriously!
Unlikely to be the amp chips, because the Aux outputs are at line level, so they bypass the amps. (The headphones output does use the amp though ofc.) First thing as always is to check the PSU voltage outputs. The last PDF in the link I posted shows the overall diagram, and the PSU is in the block marked "PU" at the lower-right of the diagram. ;) The + / - 15V rails will be important for powering all the audio opamps etc. The main DAC chip uses 12V (marked +12C), and this uses a transistor regulator off of the main +15V supply too. There are three transistor regs for +12V on the main board, just above the "PU" section. If all the voltages are OK, then it's probably due to our old friend the dodgy eletrolytic capacitor, or a faulty DAC / Rhythm gen / ROMs. Is the digital noise quite loud, or more of a quiet hiss when you turn the volume up?
RetroGamerVX Yep, but the Aux outputs bypass the amp chips, so if there's no sound from those, then the amp is probably still OK, and the fault lies elsewhere. ;) If the PSU or main board is fairly easy to get to, you only need to check three or four voltages. +5V, +15V, -15V, and +12V. There are three separate +12V supplies, but they run from the +15V supply, so if that's dead, then you know where the fault is. If you do need some amp chips though, no need to get from the US. :) www.ebay.co.uk/itm/STK4026II-INTEGRATED-CIRCUIT-X-1-PIECE-STK4026-II-/191274833135?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2c88de54ef
RetroGamerVX I don't suppose you could get a quick recording of the Aux output somehow? That might help narrow things down. Again though, always best to start..... at the start. :p "Thou shall check voltages", as EEVblog Dave would say.
@@electronash my hs-6 just got hit by lightning. Sound works then buzzes super loud, not effected by volume. Very quiet through headphones. After the crazy loud buzz, no sound at all. Any clue what it could be?
@@coolelectronics1759 I have a ketron solten giving an F-4 for memory battery. I like my old stuff and especially organ. Yet modern technology is very appealing. I suppose I'll have a synth graveyard.
I have an old Sears Galaxy Organ. Sound comes out but there is no volume control. How do I fix and how do you take the bottom panel off to get to the Pedal
The main thing to keep in mind here is that the cpu and logic circuits in this organ run off 5v and the amplifiers (opamp ects) work off +-15v and as the logic part of the organ appears to works I would ignore that at the moment.
What I would do is find IC52 (its a dual opamp that drives to aux outs) and first make sure that both +15v and -15v rails are good.
To do this check from ground to pin 4 and from ground to pin 8 or you could measure across both pin 4 and 8 but then we will be looking for near to 30v.
If these rails are good I would then crack out the oscilloscope and check for input to the opamp on pins 6 and 2. When a note is played a wave form should be present on the scope if not the I would go to the DAC IC34.
I would check the outputs of the opamp (IC45 pins 1 and 7) being driven by the DAC just in case the DAC output is very low hence the opamp buffers.
This should shed some light on the issue and give you a idea were the problem is. My money is on a lost voltage rail or shorted opamp. A good trick for finding shorted opamps is to make sure the rails are good and wait for a few minutes until the offending opamp gets hot.
Remember the first point of troubleshooting is to check voltages.
Yep, thanks :o) We actually did a live show on my other channel and we've found that the the bridge recifiers on the 15v rail are dead. Waiting for new diodes to arrive to replace, hopefully that will fix it and nothing has caused them to pop further along. There will be a follow up video either way :o)
Kris Ankers Here is a link to the live show where we diagnosed it if you fancy a watch :o) @watch?v=OTp6m33c1cI
Nice looking bit of kit! Recently picked up a Hammomd T-212 here that needs some TLC (scratchy drawbars mainly), then need to figure out how to get all 100+ Kg of it upstairs...
Tidying it up? The e cord going across the pedals would drive me batty.
Hi I have an ME-50 and everything seems to work except the lower keyboard has an issue regarding continuity. When I press a key and hold it then play the next key, the sound from the first key is played on the second key. Does that make sense. I think I have to go three notes down or up before the note value changes. Any suggestions. Sound seems to be OK, although sometimes a bit crackly and the bottom and top keys on the lower keyboard only work when. pressed very hard. Suggestions? Ideas? Also any UA-cam channels for learning organ online. Thanks in advance.
take the gas pedal out of the circuit and it sould play at full blast.
I tried this on a late model hammond solid state I chopped though but if the yahama works the same using an exciter lamp it sould give you the same end result
Its worth a try
My yamaha el900 rhythms reverb is heard only. Its volume is decreased or increased as i change reverb slider, but echo remains the same. Sounds heard as lot of reverbed. Setting level to min just mutes the speakers. Any ideas?
Some days ago, pedal sounds also has started doing same :(
There are 3 or 4 CPUs in this though, and three separate DACs + PWM, so if there's no sound at all, then my money is on a PSU fault (missing supply), as it looks like at least a few of the CPUs are running.
I don't think this version uses a light bulb for the expression pedal, as it doesn't have any power output on the sockets for it. The main expression pedal input does take audio, but it mixes it with the rhythm stuff, so the pedal would likely only be for the main melody sound.
In other words, if there are no sounds even from the rhythm sections, then it's unlikely to be the pedal.
EDIT: The user manual shows the main pedals socket as a multi-pin Mini DIN, but the expression pedal just loops the melody sound back in I think?
(Most of the other expression / after touch sensors use pots or resistive wires, and are handled digitally, so are also unlikely to stop all sounds working, especially from the rhythm parts.)
There is a small drive amp for the reverb / spring unit as well, but that also just mixes back into the main audio, so wouldn't stop it working altogether.
If you have a synth / keyboard / PC with MIDI-IN on it, you could try hooking up to the Electone to see if it's outputting any MIDI note signals. If not, then it could point to a Master CPU fault.
Hi, i have got offered a Clavinova YP-40 with no sound for not such a bad price. do you have any hints of what can i expect in the worst of the cases or if is somhow probable that i can face the point of not being at all able to get it to sound?
I have an HS-8. A couple of the pedals I can't get a sound out of and the pedals themselves are a bit stiff, otherwise they are not broken. I bought the organ 2nd hand so could the pedals or their contacts just be in need of a good clean?
unplug the machine
drain power
take the back cover off
check the pedals for continuity.
clean the contacts.
check the wiring harnice linking the pedalboard to the IO is pluged in all the way and check all the ICs are seeted firmly
dust off the boards with a air compressor or vacuum while you are in there
@least 10' of this video could quite comfortably be edited out and discarded without harming any animals during the process of making this masterpiece of a movie! seriously!
So could most of your comment
Ooh yes, just checked your channel, as your a huge success with your 33 subs ;). Obviously know how to make videos ;o)
Could you tell my Yamaha Electone HS 5 no 💡 light and sound so how can I do with it?
hello i have a yamaha PSR-275 that turns on and reads the keys i hit but no sound! what can i do?!?!? help
Very cool!
Unlikely to be the amp chips, because the Aux outputs are at line level, so they bypass the amps.
(The headphones output does use the amp though ofc.)
First thing as always is to check the PSU voltage outputs.
The last PDF in the link I posted shows the overall diagram, and the PSU is in the block marked "PU" at the lower-right of the diagram. ;)
The + / - 15V rails will be important for powering all the audio opamps etc.
The main DAC chip uses 12V (marked +12C), and this uses a transistor regulator off of the main +15V supply too. There are three transistor regs for +12V on the main board, just above the "PU" section.
If all the voltages are OK, then it's probably due to our old friend the dodgy eletrolytic capacitor, or a faulty DAC / Rhythm gen / ROMs.
Is the digital noise quite loud, or more of a quiet hiss when you turn the volume up?
Ahhgh, voodoo stuff ;) the noise is very low, unaffected by volume changes on the desk but changes frequency as the volume on the organ is changed :)
Spoken to a few people who say the Sanyo amp chips are legendary for dying in these and causing just this issue.
RetroGamerVX Yep, but the Aux outputs bypass the amp chips, so if there's no sound from those, then the amp is probably still OK, and the fault lies elsewhere. ;)
If the PSU or main board is fairly easy to get to, you only need to check three or four voltages. +5V, +15V, -15V, and +12V.
There are three separate +12V supplies, but they run from the +15V supply, so if that's dead, then you know where the fault is.
If you do need some amp chips though, no need to get from the US. :)
www.ebay.co.uk/itm/STK4026II-INTEGRATED-CIRCUIT-X-1-PIECE-STK4026-II-/191274833135?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2c88de54ef
RetroGamerVX I don't suppose you could get a quick recording of the Aux output somehow? That might help narrow things down.
Again though, always best to start..... at the start. :p
"Thou shall check voltages", as EEVblog Dave would say.
@@electronash my hs-6 just got hit by lightning. Sound works then buzzes super loud, not effected by volume. Very quiet through headphones. After the crazy loud buzz, no sound at all. Any clue what it could be?
My Yamaha elections HS-8T won’t turn on, I think there is something wrong with the cable but I’m not sure, what can I do?
Replace the cable?
My hs-6 got hit by lightning. Sound comes in and out, then buzzes loud as hell. Any ideas?
Id just look around for another one for free you can swap parts from or replace it altogether.
like a organ donor organ lmao
@@coolelectronics1759 I have a ketron solten giving an F-4 for memory battery. I like my old stuff and especially organ. Yet modern technology is very appealing. I suppose I'll have a synth graveyard.
The pedal that controls the volume is called the "expression pedal".
vwestlife That's the guy thanks :o)
I thought it was the gas.
It is a yamaha, after all.
Start in the areas you mentioned, not much point debugging the working electronics.
Not clear explanation.. But good video demonstration...
I use Electrone Yamaha HS_5
Hello MoTo
What is the purpose of your videos?? Your videos are very important but you seem not to care about the receipt, be serious to teach
Can’t comment on something I’ve long since gotten rid of.
Rubbish demonstration
Rubbish comment.