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GreenBar0n
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
So when the Repair guide says Pin6 should be 0V, this is an error in the guide?
Dec 25, 2025
David Cook
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
Actually, that looks good. The computer is in reset when when pin 5 of each of those chips is low (0V). The computer runs when pin 5 of...
Dec 25, 2025
GreenBar0n
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
S1 is perfect everywhere else and throughout the Simasima Repair Guide, everything works except the Sony Sound chips Pin6. Just so...
Dec 25, 2025
C
ClassicHasClass
replied to the thread
1400 power supply recommendation?
.
I've had good luck using an iBook G3 power supply, and those almost grow on trees. (That said, my regular 1400 uses the stock supplied...
Dec 24, 2025
David Cook
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
You should still check S1 (to make sure it isn't shorted). However, given the resistors (100/(100+27))*5V = 3.94V, the voltage when...
Dec 24, 2025
David Cook
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
With power off, check the continuity of S1 when pressed and not pressed. This switch often fails due to capacitor juice. I've replaced...
Dec 24, 2025
Certificate of Excellence
posted the thread
1400 power supply recommendation?
in
PowerBook (PowerPC-based)
.
I have the opportunity to pick up a couple pb1400s in good condition but they don’t have amtheir power supply. Can anyone recommend a...
Dec 24, 2025
P
phipli
replied to the thread
New LC475 user - Questions on PowerPC upgrades
.
Hum, I think you're getting muddled there - the LC 475 is very different to the LC III. The LC and LC II were very similar to each...
Dec 24, 2025
GreenBar0n
replied to the thread
Macintosh SE/30 Vertical & Horizontal Bars on Display "Simasima" Repair Guide
.
This guide was the reason I found this site and joined, well done and thank you for this! I wanted to ask about the Reset section, on...
Dec 24, 2025
Nixontheknight
replied to the thread
New LC475 user - Questions on PowerPC upgrades
.
I wonder if this would work in an LC III, it is the same computer save for the CPU
Dec 24, 2025
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