Now Reading: Sony MHC 2500 Mini HiFi system restoration
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Sony MHC 2500 Mini HiFi system restoration
3. Sony MHC2500 HiFi system restoring – CD Player, Model: CDP-S39
In my Sony MHC-2500 Mini Hi-Fi System the power board for the CD player was completely burnt, though the CD load unit and main board remains intact. Since replacing or rebuilding the power board is challenging, I decided to repurpose the system as an AUX/Line-in with an added audio filter for clearer output. The CD unit has a transformer that provides 30V, 10V, and 3V AC outputs. I built a circuit to convert the 30V into +12V and -12V and designed an audio filter circuit powered by this supply. The filtered audio output is then fed into the receiver unit.
Customized system control connector, using male and female berg strip.
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Hi, I’m Krishna Kumar (CrishCreative), a creative director with a professional background in branding and advertising. My passion lies in blending art and science to craft innovative ideas and strategies that leave a lasting impact. Beyond work, I immerse myself in art, crafting, photography, and hands-on projects—whether it’s tinkering with electronics, exploring mechanical builds, or diving into creative crafts. Driven by curiosity, I’m always learning, discovering, and finding inspiration in the unexpected. For me, every challenge is an opportunity to grow, spark fresh ideas, and create something meaningful.
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Ripley
Hello! I am trying to restore the same system, but I’ve run into a problem with the cassette player. I replaced the belts, but for some reason now the eject buttons are stuck (the doors will not open) and when I finally got a cassette in, the machine plays for a bit and then pulls the tape out of it and auto-stops. Any tips for where I went wrong?
crishcreative
Hi, I had the same issue — the mechanism pulls the tape out and then auto-stops. After many observations, I found that the problem was related to belt routing. Initially, I routed the belt around the two pulleys, but the issue persisted. Later, when I routed it as shown in the image, it started working perfectly.
As for the cassette ejection problem, it’s likely that something is getting stuck or misaligned—particularly in the eject linkage — due to pressure or a tight fit. I think you’ll need to carefully observe where it’s getting stuck after detaching the mechanism from the housing. Check around the eject lever and its locking mechanism on the left side of the drive mechanism. That’s where I suspect the misalignment or obstruction might be happening.