Roland Clan Forums

Thanks again, Cesarsound! I have replaced C83 and C63 with Wima 0.1uF 63V non-polarized polyester caps. It's working great! And in addition to replacing the many audio signal path related caps, I have also replaced all the electrolytic caps in the power supply. My XP-50 has been reborn and all these...

I think these 2 caps are simple ordinary cheap elect caps, the correct should be use the high freq. caps or ceramic multi-layers caps or polyester caps (non polarized). So that circuit can work with either polarized or non-polarized caps for C83 and C63? I happen to have a few Wima 0.1uF 63V polyes...

Hi Cesarsound, you are a God-send, thank you so much!!! I rewired R73 to R74, replaced C83 and C63, and it worked! Woo-hoo!!! You can't believe how happy I am that the problem is fixed and my XP-50 is back in business! When I powered it on I saw a horizontal bar for a moment on the top line of the d...

Thanks very much, Cesarsound! I am now confident and will do the rewiring between R73 and R74. One last thing. It was previously mentioned several posts back that someone "wired pin #2 of IC17 with R74 left and R73 with R74 (right to left)". This was a typo error, right? I think it should ...

Hi Cesarsound, I'm thinking that the "R" in "50CVR1" means a decimal point because I sometimes see resistor values like 4R7 Ohms which means 4.7 Ohms in some schematics (I am just making an analogy here). I guess then that the XP-50 schematic may have different versions. Either t...

Hi Cesarsound, I was able to get a Service Manual for the XP-50 and it has the schematic. On the schematic I am seeing the value "50CVR1" for C83 and C63, but I'm not familiar with this notation. Does it mean "50V 0.1uF"? If so, the schematic that you have must be different since...

Thanks very much, Cesarsound. I'll continue working on this and get back here if I still have questions.

Thanks, Cesarsound! Due to 0.1uF being out of stock, it turns out that I only have either 1uF or 0.47uF to replace the original 0.1uF for C83 and C63 (I previously mentioned that these caps are 0.1uF in my XP-50, not 1uF as they are in yours). If I use 1uF to replace those caps, will it possibly hav...

Hi Cesarsound, my capacitor order has arrived and I'm now ready to start working on the mainboard. But first I have a few more questions: 1. Is it alright for the battery to be installed or do I have to remove it when working on the PCB? 2. Are all those SMD capacitors such as C83, C63, C86, C90 tem...

The low impedance Panasonic FC capacitors are very good caps for audio, you will get a better audio specially in low and high frequencies. Only for your information, the Motif XS uses similar caps on analog audio path and outputs, so here is one secret of its great sound. That's really good to know...

Wow, thanks a lot, Cesarsound! You really have deep knowledge about the XP-50's circuit. Based on your advice to Moripi in this thread, I'm also thinking of replacing the capacitors C931 and C932, and the ones in the analog signal path like C6, C7, C8, C11, C174, C175, C86, and C90 even if they are ...

Thanks, Cesarsound! It is clear to me now. :-)

Regarding the capacitor replacements, someone else suggested to replace C901, C902, and C65. Do you think that is necessary, or should I replace only C83 and C63?

My XP50 had the same symtpoms of yours, when I turned on my XP-50, there was no more LCD display. Sometimes when I turned it on there was a display but it would fade away and disappear after 5 minutes. But one day the text on display disappeared at all and not returned anymore. The solution for thi...

Hi Cesarsound, I don't see any corrosion or broken traces in mine. I think my problem was that I was not using my XP-50 for a long time. As you know, electrolytic capacitors can become weak or they may even stop working if no electrical current passes through them for a long time. So one day, when I...

Hi Cesarsound, I saw someone mention replacing C901, C902, and C65 to fix the LCD display problem. Does this also help or should I replace only C83 and C63? Also I'm kinda confused because someone said he replaced all these caps (C901, C902, C65, C83, and C63) and still the problem remained. It seem...