English Amiga Board - View Single Post - Amiga 600 Rev 1.1 Op-Amp problem

turrican9 · 21 July 2020, 03:03

So I recently got hold of an Amiga 600 Rev 1.1 (The one that says A300) motherboard.

Motherboard is recapped and is working fine except for one thing. The sound is slightly distorted on both channels.

things lead me to the op-amp. On my working A600 Rev 2D board I have the +12v and -12v on the op-amp. On all other pins on the op-amp I measure around 2.3 Volts. On this board the sound is fine.

On the Rev 1.1 board I also measure the correct +12 and -12v on the op-amp. However, all other pins on this op-amp is in the 1.3v ish range.

Time to change the op-amp?

Edit: R301 must have been somewhat working at the time of this first post, as I had the +12v to the op amp.

21 July 2020, 03:03	#1
turrican9 Registered User Join Date: Apr 2015 Location: Norway Age: 47 Posts: 893	Amiga 600 Rev 1.1 Op-Amp problem So I recently got hold of an Amiga 600 Rev 1.1 (The one that says A300) motherboard. Motherboard is recapped and is working fine except for one thing. The sound is slightly distorted on both channels. things lead me to the op-amp. On my working A600 Rev 2D board I have the +12v and -12v on the op-amp. On all other pins on the op-amp I measure around 2.3 Volts. On this board the sound is fine. On the Rev 1.1 board I also measure the correct +12 and -12v on the op-amp. However, all other pins on this op-amp is in the 1.3v ish range. Time to change the op-amp? Edit: R301 must have been somewhat working at the time of this first post, as I had the +12v to the op amp. Last edited by turrican9; 22 July 2020 at 12:01.