Hey All,

Can't seem to find a replacement for this capacitor as it's obsolete? I was thinking of going up in capicatnce and maybe voltage, but not sure if it'll cause any problems within the circuit

Will it?

 

66 choices from Mouser
https://www.mouser.co.uk/c/passive-...tors|~Product|~Capacitance|~Voltage Rating DC

 

Then one in question looks like an electrolytic capacitor(orange), would these ceramic ones be interchangeable?

 

That explains "BP" on the circuit diagram "BiPolar" so the original was a bipolar electrolytic.
Avoid ceramic, but any plastic film capacitor could be used as a replacement (and probably be more reliable than the original)

 

I think the value is not critical. I made a list to 50 & 100 V parts. 0.22uF, 0.33 and 0.47uF because there are many 0.47 and no 0.22uf.
Aluminum Electronic bi-polar.
digikey Many on this list are not in stock. I include them because you might find them from a different source.
Before you pay money, please have us look at your choice.
I also looked for two 0.1uF in parallel but they are hard to find. lol

 

This is AC coupling LINE OUT.
Just about any capacitor will do, even 1μF 25V aluminum electrolytic.
Why do you think that the capacitor needs to be replaced?

 

Just recapping the whole power supply, as the synth powers on after plugging it in, and out about every 20 tries. seems like it's not apart of the power supply though ?

 

Just recapping the whole power supply, as the synth powers on after plugging it in, and out about every 20 tries. seems like it's not apart of the power supply though ?

I don't go about replacing components just for the heck of it.
Replace only the ones that are broke!

 

haha I would! I just don't have the knowledge to trouble shoot the circuit, but I know generally that power problems are usually caps, and it being close to 40 years old. I thought that would be the best way to go about it.

 

That is a terrible way to fix a problem. How do you know that by interfering with the circuit you will just make matters worst?
Rather that trying to shoot in the dark, come here on AAC and let the experts guide you. You might learn something along the way.

1) Tell us the make and model number of the gadget.
2) Tell us what are the symptoms.
3) Tell us what test equipment you have at your disposal.
4) Post links to a Service Manual or circuit schematics.

Then we will guide you on how to trouble shoot the problem.

 

that sounds fun to me !

1)its a Casio cz1000
2)its intermittently powering up, it'll power up randomly but then if I power it down it'll not power up again. I think that means a power supply problem?
3) I have a multimeter and an oscilloscope
4)https://www.polynominal.com/sample-packs/casio-cz101/casio-cz101-service-manual.pdf

Thanks again!

 

What is the make and model of the multimeter and the oscilloscope?

 

triplett 9007A and goldstar 9020p

 

triplett 9007A and goldstar 9020p

Ok. Good to know.
When you say "intermittent power up", do you know if it is power up problem or just no output from speakers and headphones?
They would lead to two different trouble shooting paths. There is a relay that must click in in order to get sound output.

 

its definitely a power up problem, when I click the button theres no sign of power lights and the lcd screen doesn't work , it works perfectly when it does power up and I see the lights and lcd screen work. I do hear that click when it powers up

 

its definitely a power up problem, when I click the button theres no sign of power lights or lcd screen doesn't work , it works perfectly when it does power up . I do hear that click when it powers up

Ok, that's an easy one. The first prime suspect is the power on switch. Switches do wear out.
See where power enters the board after the switch. Use alligator clips and constantly monitor the voltage being supplied to the board. Next time it does not power up, the meter will tell you whether or not the power switch is the culprit.

 

Would that be y and w? Also it seems, I never noticed this when I plugged it in before; that sometimes it will briefly power up, not sure if this is indicative of something or not

 

The other common failure mode is a bad cable on the power adapter.
I am not there to see the unit. I can only guess your situation.
Does the unit have a power adapter? If yes, show us the label on the adapter.
Power comes in on a barrel jack?
The power switch could be a "soft" switch, i.e. it does not switch the power directly. In controls the power through some electronic circuit.

The first line of attack is to monitor the voltage coming in from the power adapter. Chances are the problem is a bad power cable, a worn out power jack, or a loose connection at the power jack.

Edit: We don't need a photo of the power adapter. We know that it is supposed to output 9VDC, centre positive.
The power switch is a "soft switch". This puts it further down in the list of suspects.

 

Here is the power input circuit.
9VDC power comes in on terminal 2. Terminal 1 is ground.

 

The other common failure mode is a bad cable on the power adapter.
I am not there to see the unit. I can only guess your situation.
Does the unit have a power adapter? If yes, show us the label on the adapter.
Power comes in on a barrel jack?
The power switch could be a "soft" switch, i.e. it does not switch the power directly. In controls the power through some electronic circuit.

The first line of attack is to monitor the voltage coming in from the power adapter. Chances are the problem is a bad power cable, a worn out power jack, or a loose connection at the power jack.

Yea it has a power supply, The connector is a barrel jack.
Should I be looking for 9volts with my multimeter set to voltage?