Hi keyboard enthusiasts, fans, and professionals,
I bought my Technics KN2000 back in 1995 at Brash’s in Pitt St, Sydney, during a clearance sale. At the time, it was one of the best arranger keyboards on the market. I’ve been happily playing it for the last 29 years, and it’s still in great condition.
However, one Saturday afternoon, after powering it on, it suddenly lost all power after about 10 minutes. At first, I suspected my surge protector, but it turned out to be something deeper.
I opened it up for inspection and found all five fuses intact (three on the mains transformer and two on the Power Distribution Board, confirmed with continuity checks). What I did find was a blown 2Ω fusible cement resistor (reading open/OL). I ordered replacements online, which took about 3 weeks to arrive.
Before swapping the resistor, I wanted to make sure nothing else caused the fault. Sure enough, I found a shorted SMD capacitor on the main logic board near the CN8 connector. I replaced it with a 10µF 25V electrolytic cap. Since I couldn’t source the original ’90s low-ripple/low-noise SMD polar cap, I mounted the electrolytic sideways so it could fit under the sound module. Functionally, it matched closely enough to work.
After that repair, progress was partial: all panel lights came on, but still no LCD, no backlight, and no sound.
Next, I checked the Power/Amp board. All the voltage regulators seemed fine, but I discovered a shorted output transistor (C4327). I replaced it with a 2SC5200 (PNP), which had the same characteristics, though slightly larger.
On power up, I now get:
Unfortunately, as this model was discontinued decades ago, replacement modules/parts are nearly impossible to find. A technician I spoke to also said sourcing parts would be next to impossible. He also said there would be a $125 Bench Testing Fee, but i think that is as far as it will probably go since he said there aren't any parts for this keyboard.
Has anyone here experienced similar issues with a Technics KN2000, or can they offer advice on where to go from here? Any tips or guidance would be much appreciated.
I bought my Technics KN2000 back in 1995 at Brash’s in Pitt St, Sydney, during a clearance sale. At the time, it was one of the best arranger keyboards on the market. I’ve been happily playing it for the last 29 years, and it’s still in great condition.
However, one Saturday afternoon, after powering it on, it suddenly lost all power after about 10 minutes. At first, I suspected my surge protector, but it turned out to be something deeper.
I opened it up for inspection and found all five fuses intact (three on the mains transformer and two on the Power Distribution Board, confirmed with continuity checks). What I did find was a blown 2Ω fusible cement resistor (reading open/OL). I ordered replacements online, which took about 3 weeks to arrive.
Before swapping the resistor, I wanted to make sure nothing else caused the fault. Sure enough, I found a shorted SMD capacitor on the main logic board near the CN8 connector. I replaced it with a 10µF 25V electrolytic cap. Since I couldn’t source the original ’90s low-ripple/low-noise SMD polar cap, I mounted the electrolytic sideways so it could fit under the sound module. Functionally, it matched closely enough to work.
After that repair, progress was partial: all panel lights came on, but still no LCD, no backlight, and no sound.
Next, I checked the Power/Amp board. All the voltage regulators seemed fine, but I discovered a shorted output transistor (C4327). I replaced it with a 2SC5200 (PNP), which had the same characteristics, though slightly larger.
On power up, I now get:
- A slight “pop” from the speakers
- Panel lights working
- A low hum from both speakers
- Still no LCD, no backlight, and no sound
Unfortunately, as this model was discontinued decades ago, replacement modules/parts are nearly impossible to find. A technician I spoke to also said sourcing parts would be next to impossible. He also said there would be a $125 Bench Testing Fee, but i think that is as far as it will probably go since he said there aren't any parts for this keyboard.
Has anyone here experienced similar issues with a Technics KN2000, or can they offer advice on where to go from here? Any tips or guidance would be much appreciated.
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