Macintosh SE 30 simasi pattern / no audio: the solution .

First start after recapping and reworking audio IC bypass circuits: bear to life.

Audio circuits checked and reworked (C4 C5 C6 are bypass to ground anti ripple lines of UB10 and UB11 audio ICs):

UB10-15/UB11-15 +C5- ground line
UB11-10 +C4- ground line
UB11-7 +C6- ground line


Note: C13 "+"lead (5 Volt to downside ground mesh) was rerouted to C11 using a red wire because of a procedure mistake i did, so don't care about it.

Category:

Science & Technology

Tags:

• Macintosh
• SE
• SE30
• SE/30
• recapping
• regeneration
• simasi
• pattern
• no
• audio

[drivojulianrobotnik]

What happened to the audio circuitry? Cut traces?

[cammeloo]

Despite new capacitors it sounded very low.

I checked resistivity and i found it too high compared to another board i had. I suspect they were corroded because of capacitor solution leak.

[yoshmon]

Apple UNIX is the shit to run on this unit!!

[R33Racer]

Nice job, I hope my friend can fix my SE/30 one day. All I get is horizontal black and white lines. :(