matt decat Posted May 21, 2013 Posted May 21, 2013 Gday, So its exam time at uni, and what that means is that i need a way to waste time. This semester, my procrastination is an attempt to restore an amp that i bought almost 6 months ago. The amp in question is a Yamaha CA-2000 (aka the japanese version of the CA-2010). After seeing the following thread i thought id give it a shot. ( http://www.stereo.net.au/forums/index.php?/topic/41409-yamaha-ca-1010-restoration-lots-of-pics/ ) Now im not saying that i have the ability of John and Pete, but i did a bit or work with electronics at school so i should know the basics to get me through this. This thing has been sitting around collecting dust since i bought it and i need to buy a transformer, or ideally, change the power supply board to match the one that was fitted with the australian model. Because I havent turned it on ever, and bought it from yahoo auctions in japan, i have no idea if it actually works or not. the ad said it does, but that could just be poor translation. The overall condition in reasonable, has a chip on the top edge of the face plate, a scratch on the volume knob and a few scratches on the wooden cover. unfortunately, i opened it up when i first received it and noticed it was filthy inside as any old piece of kit would be. I naively bought some electric component cleaner from jaycar to clean of some of the flux, but heard some popping noises when i sprayed it. thinking that those noises meant something bad i stopped and havent touched it since. So not only would i have to give this a full re-cap, i also need to see what other components i may have damaged or may have already been faulty. So the first few questions that I have are, what are the things i should look out for, both general items and specifically for this amp? Also, is it possible to tell exactly what capacitors i need and how many of them prior to pulling it all apart, that way i dont waste time sitting around waiting for parts to come in? Also, any recommendations for removing the large amounts of flux as my initial idea seems to have caused more problems than expected? Thanks in advance guys
skippy124 Posted May 22, 2013 Posted May 22, 2013 Hi, Congrats on the CA-2000!! Firstly, as you have said this is the Japanese domestic market version of the CA-2010, and as such would need a new mains transformer if you wanted to operate it off 240V. It will have a single voltage 100V input transformer which cannot be changed to 240V. You will need an external 240V to 100V step down transformer - Tortech would be the best place to start. Don't use a 240 to 110 or 240 to 120 step down, make sure you use a 240/100. Re the flux, there is no need to clean that off the bottom of the circuit boards, if the tops of the boards are dusty/dirty, try a small paintbrush and a vacuum cleaner, and be gentle with the brush. Don't do any spraying/cleaning with the unit plugged in. If you are going to attempt a recap, then don't do anything until you check that it is operating correctly powered via the 240/100 step down transformer. That way you will have a reference point to check that the recap has not introduced any problems. I don't think that you will find a cap list for the CA-2000, there may be some around for the CA-2010, but there may be some differences between these two. You can download a service manual for the CA-2010 and get a cap list from this, but as stated before there may be some differences. The only way to be sure is to check over the unit and get a list of caps form what is fitted, or check some of the caps against the service manual, and if they agree, then it may be OK to sue the service manual. Cheers John
Sam Z Posted May 27, 2013 Posted May 27, 2013 (edited) I have a CA-2010 you can use for a reference point if you ever need to. I think I have a cap list for the 2010 but it'd probably be a little different to the 2000. Also, if you're local I can lend you my 100V stepdown until you get one yourself. As John said, you can't convert it to 240V, not in any remotely cost effective way anyway—the transformer itself is wound only for 100V input. Good luck with the resto, I'm hoping to do mine one day. Edited May 27, 2013 by Sam Z
Steronetchris1989 Posted October 28, 2019 Posted October 28, 2019 On 22/05/2013 at 10:08 PM, skippy124 said: Hi, Congrats on the CA-2000!! Firstly, as you have said this is the Japanese domestic market version of the CA-2010, and as such would need a new mains transformer if you wanted to operate it off 240V. It will have a single voltage 100V input transformer which cannot be changed to 240V. You will need an external 240V to 100V step down transformer - Tortech would be the best place to start. Don't use a 240 to 110 or 240 to 120 step down, make sure you use a 240/100. Re the flux, there is no need to clean that off the bottom of the circuit boards, if the tops of the boards are dusty/dirty, try a small paintbrush and a vacuum cleaner, and be gentle with the brush. Don't do any spraying/cleaning with the unit plugged in. If you are going to attempt a recap, then don't do anything until you check that it is operating correctly powered via the 240/100 step down transformer. That way you will have a reference point to check that the recap has not introduced any problems. I don't think that you will find a cap list for the CA-2000, there may be some around for the CA-2010, but there may be some differences between these two. You can download a service manual for the CA-2010 and get a cap list from this, but as stated before there may be some differences. The only way to be sure is to check over the unit and get a list of caps form what is fitted, or check some of the caps against the service manual, and if they agree, then it may be OK to sue the service manual. Cheers John Hi John, may I ask why you wouldn't use a 240/120 stepdown?
pete_mac Posted October 28, 2019 Posted October 28, 2019 59 minutes ago, Steronetchris1989 said: Hi John, may I ask why you wouldn't use a 240/120 stepdown? The CA-2000 is a JDM/Japanese market amplifier suited to 100V only, thus you must use a 240V to 100V stepdown transformer.
Steronetchris1989 Posted October 28, 2019 Posted October 28, 2019 Ok, iam currently using a 240/120 Step down on my ca2000 with no issues, will this be ok?
pete_mac Posted October 29, 2019 Posted October 29, 2019 1 hour ago, Steronetchris1989 said: Ok, iam currently using a 240/120 Step down on my ca2000 with no issues, will this be ok? No, you need to source the correct transformer. How are you determining that the amp is performing with no issues? Your amp will currently be experiencing internal voltages that are 20% higher than it was designed for. This is not good! Under these circumstances, some amps will die a nasty electrical death. Some may continue to function OK for a while if the capacitors are in tip-top condition and the voltage rating of the caps aren't being exceeded. However, the likelihood of the latter occurring is very high given you are running the wrong step-down. Grab a 100V step-down pronto - there's really no excuse when you can source 1000VA examples from Wall-Cann for around $100 delivered. https://www.wallcann.com.au/1000w-voltage-converter/?___store=default 1
Ericcklau Posted October 29, 2019 Posted October 29, 2019 I think my one have some issue on the selector switch, maybe bad contact sometime the sound of the right speaker sort of fade away, then just turn the selector switch one or two times it works again. How do you normally clean out the switch to maintain good contact?
Guest jakeyb77 Posted October 29, 2019 Posted October 29, 2019 (edited) 34 minutes ago, Ericcklau said: I think my one have some issue on the selector switch, maybe bad contact sometime the sound of the right speaker sort of fade away, then just turn the selector switch one or two times it works again. How do you normally clean out the switch to maintain good contact? All of these amps lose sound from the selector switches. Many have been thrown out when perfectly good. Take the knob off or take the lid off the amp, and clean the switch with De-oxit or even WD-40 contact cleaner. NOT NORMAL WD-40 the one with the yellow lid. Edited October 29, 2019 by jakeyb77
Ericcklau Posted October 29, 2019 Posted October 29, 2019 Thank you for your great tips, I will try do it later. All of these amps lose sound from the selector switches. Many have been thrown out when perfectly good. Take the knob off or take the lid off the amp, and clean the switch with De-oxit or even WD-40 contact cleaner. NOT NORMAL WD-40 the one with the yellow lid.
Monkey_Relish Posted October 29, 2019 Posted October 29, 2019 (edited) If contact cleaner, or Deoxit doesn’t work, the only fix is to desolder the sliding switch and clean the contacts. I use Autosol aluminium polish, but brasso would do. Then clean with isopropyl alcohol. Good Luck. Mr Relish Edited October 29, 2019 by Monkey_Relish 1
Steronetchris1989 Posted October 29, 2019 Posted October 29, 2019 5 hours ago, pete_mac said: No, you need to source the correct transformer. How are you determining that the amp is performing with no issues? Your amp will currently be experiencing internal voltages that are 20% higher than it was designed for. This is not good! Under these circumstances, some amps will die a nasty electrical death. Some may continue to function OK for a while if the capacitors are in tip-top condition and the voltage rating of the caps aren't being exceeded. However, the likelihood of the latter occurring is very high given you are running the wrong step-down. Grab a 100V step-down pronto - there's really no excuse when you can source 1000VA examples from Wall-Cann for around $100 delivered. https://www.wallcann.com.au/1000w-voltage-converter/?___store=default Thank you very much, I just picked one up from him today and he explained it to me, big no no! Hahaha, thanks man ❤ 1
pete_mac Posted October 29, 2019 Posted October 29, 2019 30 minutes ago, Steronetchris1989 said: Thank you very much, I just picked one up from him today and he explained it to me, big no no! Hahaha, thanks man ❤ Good stuff! After I posted the link, I realised that you were both located in Adelaide which is very convenient.
mbz Posted October 29, 2019 Posted October 29, 2019 15 hours ago, Ericcklau said: How do you normally clean out the switch to maintain good contact? Unplug the unit, remove the wooden case (4 screws), remove the shield on the function board bu unscrewing the 4 screws maybe 2-3turns, don't fully remove then slide shield forward and lift off. The selector switch is open so you have reasonable access for spray then work the switch. Sometimes it's necessary the unsolder then disassemble then deep clean the switch (=PITA) Haven't found a good spray cleaner locally, not a fan of servisol. 1
Monkeyboi Posted October 30, 2019 Posted October 30, 2019 On 29/10/2019 at 7:54 AM, Steronetchris1989 said: Ok, iam currently using a 240/120 Step down on my ca2000 with no issues, will this be ok? I totally concur with @pete_mac. You seriously run the risk of damaging the amplifier which might be costly to repair. Please, please, pretty please, DO NOT run this beautiful classic Japanese 100v amplifier on 120v. Cheers, Alan R.
Steronetchris1989 Posted October 30, 2019 Posted October 30, 2019 Hi, I connected the original untouched ca2000 to the 240/120 stepdown and both speakers wore working, I only ran it for under 10min and now I'm barley getting any sound out of one side. Luckily I have another refurbished ca2000 and I have got a 240/100v step down realy realy happy!!!! But now I have to fish the other one!!!!???? I need to get in contact with a Adelaide repairer.
Ericcklau Posted October 30, 2019 Posted October 30, 2019 On 29/10/2019 at 6:23 PM, Monkey_Relish said: If contact cleaner, or Deoxit doesn’t work, the only fix is to desolder the sliding switch and clean the contacts. I use Autosol aluminium polish, but brasso would do. Then clean with isopropyl alcohol. Good Luck. Mr Relish Thank you I try
Ericcklau Posted October 30, 2019 Posted October 30, 2019 13 hours ago, mbz said: Unplug the unit, remove the wooden case (4 screws), remove the shield on the function board bu unscrewing the 4 screws maybe 2-3turns, don't fully remove then slide shield forward and lift off. The selector switch is open so you have reasonable access for spray then work the switch. Sometimes it's necessary the unsolder then disassemble then deep clean the switch (=PITA) Haven't found a good spray cleaner locally, not a fan of servisol. Thank You I hope I will not break anything
Recommended Posts