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NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: ProNEC on September 05, 2020, 11:28:37 PM

Title: Turbo Express VR500 and VR501 OHM Values
Post by: ProNEC on September 05, 2020, 11:28:37 PM

Does anyone know what the values of the VR500 and VR501 should be? Thank you.

Title: Re: Turbo Express VR500 and VR501 OHM Values
Post by: nyandeyanen on October 28, 2020, 12:47:01 AM

Quote from: ProNEC on September 05, 2020, 11:28:37 PM

Does anyone know what the values of the VR500 and VR501 should be? Thank you.

I could probe the values on mine if you want, but I'd guess that the values are specific to each unit. Thus the need for potentiometers instead of a resistor. I set the voltage with VR500 to about 4.6v when used with a 7v power adapter from retrogamecave, starting at its highest resistance value to avoid blowing the fuse (again, heh) until I arrived at the voltage I wanted, and tweaked VR501 until the display was as clean as I could get it. I'm using an LCDDRV display mod though.

Title: Re: Turbo Express VR500 and VR501 OHM Values
Post by: Dylanward on October 29, 2020, 10:33:46 AM

Hello, why are you askin for the pots values?