MOOG MINIMOOG.
An Inside view. All PCB boards removed. Checking and consolidating the soldering points. "Type-J" pots cleaned for a smooth feel action.
Board 2: Keyboard/Glide/Decay circuit.
Some diodes and fried transistors changed. The 2 transistors on the right (gold plated pins, white neck and black head ;), hard to find N-Chanel JFET 2N4303 were successfully replaced by NTE133. A lot of parts have been changed on other boards too. Some wasn't the correct ones, I've found a lot of exotic replacement references, too far from the specs. I've changed each unwanted component, in order to have a mini as close as possible to its original electronic design.
And now I hear the difference: warmer, fatter, brighter...
But...Where are my screws ?
A global view of the fighting field...
The Octave Buffer Board.
After a lot of problems, PCB boards and LHC are Ok now, and ready to be definitely installed.
An happy cocktail: Old Oscillator board from # 4xxx, VCA #6xxx, LHC #11xx, etc...
Removing/re-installing boards may be dangerous for them ! This task require an excessive attention...
**Click here to see how to proceed step by step**
The Cinch Jones connectors have been changed. This connectors become unreliables with age. When it's corroded, the metal is too resistive. Responsible for erratic contacts. Even a minutious cleaning can't resolve that. Maybe a treatment with acid ? CJ with gold plated contacts are better...That's the reason why they where fitted in latest mini's. But Gold plated SUB-D connectors seemed to be a good replacement choice. So...
The nice surprise: the space between the 2 screws on the LHC is quite the same...Easy to install, but before that, time and a precise iron solder are required...
The keyboard's Cinch Jones connectors were changed too. The Leopard fur is wrapping the cables...
Much more sexy than black plastic, no ?