A Yankee joins the Krauts

[bobo68]

Sorry for the topic, could not resist. 

I just acquired a US Macintosh Plus in nice (outside) condition. It is a 1987 model.



It even came with a voltage transformer as it was used before over here. I guess I have to do the usual recap. Also the screen flickers when I (gently) hit the side of the case. What could that be?

Best, bobo68

 

[TheWhiteFalcon]

Probably something loose on the analog board.

 

[bobo68]

Is there a list of capacitors for replacement available? I searched here and in the web but did not find one.

TIA, bobo68

 

[mactjaap]

I soldered the connectors on the analog board with some new solder and the flickering stopped. Maybe it will do the trick with your Plus too.

 

[bobo68]

Ok, thanks.

I still would like to have a complete list of all caps (analogue and digital board) for reference. So far I found one for the analogue board: http://www.jagshouse.com/68kfaq.html#plusanalogue

 

[bobo68]

I guess I'm very lucky. The mainboard of my new Plus looks phenomenal. Just a bit of dust. It has 4 MB installed. The caps on the mainboard are of normal axial type:

5x 33uF, 16 V

1x 1uF, 50 V

All are ca. 13 mm long (just the body) and their solder joints are ca. 20 mm apart.

The caps look very good, no goo. Is a recap advisable anyway?

 

[Elfen]

128K, 512K, Pluses and SE's rarely need a logic board recap. But they do need work on the analog board. Check for cracked solder connections on harness connectors to the logic board and the crt yoke. Desolder the bad solder, clean up the area and resolder with fresh flux and solder. If you just reheat the joint and reflow the old solder, it will break again and break in a short amount of time. Fresh Soldering will keep the connection going for years.

 

[360alaska]

This is probably an international analog board, the capacitor references will be different...

 

[bobo68]

This is probably an international analog board, the capacitor references will be different...

Sorry, I do not get it. I have US Mac Plus, why would it have an international analog board?