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Multiboard Electronics
The Multiboard electronics, sometimes referred to old electronics are usually used in the MKII and MKIV Brewers. Some of the earlier MKIII brewers may also be running the multiboard electronics.
FAQ
Q: What are the differences between new vs old temperature circuit on the clock board?
A: Note the resistors on the top left of the boards below (New Vs Old). New temperature circuits, some resistors has been replaced with a jumper wire.
Q: What is the differences between new vs old temperature circuit on the SPS board?
A: Old circuit . Power Supply - R601, R604 and R605 are 11M and R602, R606 and R607 are 1.6M
New Sec. Power Supply - R601, R604 and R605 are 825K and R602, R606 and R607 are 3M
Q: What pot controls what on the SPS board?
A: 
Q: What are the jumper settings for multi IO board (IOS) ?
A:
| Part# | J6 | J7 | J8 | J9 | J10 | J11 | J12 | J13 | J14 | J15 | J16 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BA-E50/A | 1-2 | NC | 2-3 | 2-3 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | N2 |
| BA-E50/B | 2-3 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | N4 |
| BA-E50/D | 2-3 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | 2-3 | 2-3 | 2-3 | N3 |
| BA-E50/E | 1-2 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | 2-3 | 2-3 | 2-3 | N3 |
Q: What control goes to what connector?
A:
| Part# | J1 | J2 | J3 | J4 | J5 | Applies |
|---|---|---|---|---|---|---|
| BA-E50/A | NC | Micrometer | Shutter | SPS | NC | MkII & MkIV |
| BA-E50/B | Iris | FW#1 | FW#2 | NC | NC | MkII, MkIII & MkIV |
| BA-E50/D | Zenith | Azimuth | FW#3 | Control | NC | MkIV |
| Ba-E50/E | Zenith | Azimuth | Micrometer#2 | Control | NC | MkIII |
| SPS | A2D | BA-E50/A | Heat Sink |