AshhBoy_
New Member
I've been using this beautiful unit for a little while now and thought everything was fine, although a bit crunchy when pressing buttons. The Sound has the 'warm' feeling from old caps and the power supply caps for sure need to be replaced, hence that thread. The first owner was my father, unit was never serviced, and stayed powered off for most of the last 20 years (except the last three lol).
Picture from the brochure:
Recently, however, I've tackled some issues with my preamp, and while at it thought I'd group my order for a recap of both this equalizer and the problematic preamp. I'll be replacing all electrolytics without distinction as to where they reside in the equalizer, along with upgrading the plethora of 4558D with NE5532P.
When choosing capacitors, I went with either the cheapest 'audio' Nichicon or general-purpose caps when they presented better specs on paper (used ripple current and service hours as a metric, as they don't include their ESR ratings unfortunately). Kept every single cap with the same rating capacity-wise, but upgraded some in their voltage ratings as it was far cheaper on large quantities (grouping with my DBX-CX3 MKI for the order).
For documentation purposes, I'll be attaching clean pictures of every board once I take them out for soldering, and I can already post my parts lists for the recap. (attachments, can't attach .xlsx for some reason)
Picture of my unit running (sorry for the bad quality, will do one better once I pull it out of my system):
I also have a little request for help from the knowledgeable people here, as I was unable to find an answer even after doing three days of research (shame on me maybe?):
The right side of my analyzer display (neon tech I believe) is turning on upon power-up, before giving out for about 15mins while playing. Then it comes back on and works again and stays like this. Only noticed this in the last couple of weeks, and have been using the equalizer for 3 years. My understanding is that it's an expansion and heat-creep-related issue, and I went ahead and redid all the solder joints in the area of the screen hoping one of them was cold. That wasn't a fix, unfortunately. If anyone has information on the way that screen is driven, and what could be the issue, please share it as that would be of tremendous assistance.
Picture of the issue, where we can clearly see some rows and lines not working:
I've also tried looking at a 'for parts' unit, but they go for $150-250 in non-working condition here in Europe so that's not a solution I'm keen on as of now. If anyone has the board for the screen and is willing to sell it, I'm interested.
The service manual is available here, and the whole schematic is available but I don't know enough in order to figure out what could be the issue unfortunately, so if anyone is able to help I'd be very thankful!
Thanks for reading me!
Picture from the brochure:
Recently, however, I've tackled some issues with my preamp, and while at it thought I'd group my order for a recap of both this equalizer and the problematic preamp. I'll be replacing all electrolytics without distinction as to where they reside in the equalizer, along with upgrading the plethora of 4558D with NE5532P.
When choosing capacitors, I went with either the cheapest 'audio' Nichicon or general-purpose caps when they presented better specs on paper (used ripple current and service hours as a metric, as they don't include their ESR ratings unfortunately). Kept every single cap with the same rating capacity-wise, but upgraded some in their voltage ratings as it was far cheaper on large quantities (grouping with my DBX-CX3 MKI for the order).
For documentation purposes, I'll be attaching clean pictures of every board once I take them out for soldering, and I can already post my parts lists for the recap. (attachments, can't attach .xlsx for some reason)
Picture of my unit running (sorry for the bad quality, will do one better once I pull it out of my system):
I also have a little request for help from the knowledgeable people here, as I was unable to find an answer even after doing three days of research (shame on me maybe?):
The right side of my analyzer display (neon tech I believe) is turning on upon power-up, before giving out for about 15mins while playing. Then it comes back on and works again and stays like this. Only noticed this in the last couple of weeks, and have been using the equalizer for 3 years. My understanding is that it's an expansion and heat-creep-related issue, and I went ahead and redid all the solder joints in the area of the screen hoping one of them was cold. That wasn't a fix, unfortunately. If anyone has information on the way that screen is driven, and what could be the issue, please share it as that would be of tremendous assistance.
Picture of the issue, where we can clearly see some rows and lines not working:
I've also tried looking at a 'for parts' unit, but they go for $150-250 in non-working condition here in Europe so that's not a solution I'm keen on as of now. If anyone has the board for the screen and is willing to sell it, I'm interested.
The service manual is available here, and the whole schematic is available but I don't know enough in order to figure out what could be the issue unfortunately, so if anyone is able to help I'd be very thankful!
Thanks for reading me!
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