Jump to content


Photo

Macintosh II Series 1/2 AA Battery B2: Alternative Solutions


  • Please log in to reply
16 replies to this topic

#1 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 08 October 2014 - 05:02 PM

Hello all, 

 

I recently received a Macintosh IIx that had its soldered PRAM batteries removed.

 

I believe battery B2 provides the voltage for the power supply to start up once the power button is pressed.

 

Since I didn't have any 1/2 AA batteries/holders I soldered a 9v battery to B2. The Mac did not come on when the power button was pressed.

 

After this I removed the 9v battery and replaced it with a AA battery holder, supplying 3v altogether. The Mac did not start in this configuration.

 

What am I missing? Do batteries need to be present in B1 and B2 for the Mac to start?

 

 I'm sure a similar technique was shown inside a Macintosh II on an episode of Jason's Macintosh Museum.

 

 


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#2 max1zzz

max1zzz
  • 68000
  • LocationSurrey, England

Posted 08 October 2014 - 05:25 PM

i think both are needed for it to start with the power button (when i was playing with that mac IIx i did try wedging a couple of 3.6v batteries in their before and i'm sure it started fine then)


68K: Plus, LC, LCII, IIci, Perf 450, Perf 630, Duo 230
PPC: Perf 6200, PM 8600, PB 1400, G3 DT x2, G3 B/W, iBook G3 500, iMac G3 SL, G4 Sawtooth, G4 QS, iMac G4 700, PB G4, PM G5, Xserve G4 Trayload
Intel: Early '08 MBP

#3 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 08 October 2014 - 06:05 PM

I've ordered another AA holder so I'll report back when it arrives.


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#4 max1zzz

max1zzz
  • 68000
  • LocationSurrey, England

Posted 08 October 2014 - 09:57 PM

Good luck :)

 

Having a quick look at the II/IIx startup circuit: http://home.earthlin...es/macIIsch.GIF it dose indeed appear that both batteries are required


Edited by max1zzz, 08 October 2014 - 09:57 PM.

68K: Plus, LC, LCII, IIci, Perf 450, Perf 630, Duo 230
PPC: Perf 6200, PM 8600, PB 1400, G3 DT x2, G3 B/W, iBook G3 500, iMac G3 SL, G4 Sawtooth, G4 QS, iMac G4 700, PB G4, PM G5, Xserve G4 Trayload
Intel: Early '08 MBP

#5 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 08 October 2014 - 10:42 PM

Cheers! 

 

Thanks for the confirmation!


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#6 unity

unity
  • 68020
  • LocationGreen Bay, WI

Posted 09 October 2014 - 01:12 AM


• Drexel Macintosh • IIcx prototypes (4) • Don Crabb's Outbound 125 • Macintosh II/x/fx • Macintosh SE/30 • Macintosh SE • Macintosh Classic II Proto • Macintosh 512k • Macintosh 128k


#7 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 11 October 2014 - 11:30 AM

I've just added an AA battery holder to B1 and B2 for 6v in total. It still does not let the Mac start up.

 

Does this mean that the trickle voltage is not enough to start the Mac?


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#8 max1zzz

max1zzz
  • 68000
  • LocationSurrey, England

Posted 11 October 2014 - 01:05 PM

Have you tried both the power button on the keyboard and the one on the back? My other IIx had a broken trace leading from the power button on the back, it's possible this one could aswell


68K: Plus, LC, LCII, IIci, Perf 450, Perf 630, Duo 230
PPC: Perf 6200, PM 8600, PB 1400, G3 DT x2, G3 B/W, iBook G3 500, iMac G3 SL, G4 Sawtooth, G4 QS, iMac G4 700, PB G4, PM G5, Xserve G4 Trayload
Intel: Early '08 MBP

#9 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 11 October 2014 - 09:10 PM

I've just powered on the IIx via the keyboard and it works!

 

Which trace did you have to fix Max? Did it happen to be the trace that leads to the the ADB port? This one looks a bit rotten.

 

The other three power button traces tested good for continuity. 


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#10 max1zzz

max1zzz
  • 68000
  • LocationSurrey, England

Posted 11 October 2014 - 10:34 PM

It was leading in that direction, but i'm not sure if it was actually connected to a adb port or not

 

But if there is a rotten looking trace test it anyway

 

It is one of the traces in the red oval
photo(42) copy.jpg


68K: Plus, LC, LCII, IIci, Perf 450, Perf 630, Duo 230
PPC: Perf 6200, PM 8600, PB 1400, G3 DT x2, G3 B/W, iBook G3 500, iMac G3 SL, G4 Sawtooth, G4 QS, iMac G4 700, PB G4, PM G5, Xserve G4 Trayload
Intel: Early '08 MBP

#11 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 28 October 2014 - 10:18 PM

Today I have been messing around with the IIx and this is what I have found out:

 

It will not turn on when the power button is pressed but once the IIx is on pressing the power button will turn it off.

 

The IIx can be turned on via its keyboard.

 

Switch Traces EDIT.jpg

 

Out of the four traces highlighted one does not test for continuity. Even when I bridged the two points with wire the IIx power switch still did not power it on.

 

Could the switch be dead?

 

 


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#12 techknight

techknight
  • 68LC040

Posted 30 October 2014 - 12:11 AM

I am actually working on my first IIx today. its a wreck like yours, bad continuity on one of the switch traces, and there was some rot at the 74HC132s, breaking connections there as well. 

 

Once i fix all that mess, it might actually work haha. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#13 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 12 November 2014 - 01:24 AM

I've fixed the offending trace and the IIx switches on like it should!

 

Could a Moderator please remove the diagram in my last post? It is incorrect because the red trace actually connects to pin 4 of the black component; it does not connect to the ADB post as the diagram suggests.

 

Thanks 


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#14 techknight

techknight
  • 68LC040

Posted 12 November 2014 - 01:44 AM

I had the same trace open as well, along with an open trace at the 74HC132s near the nubus slots, responsible for power switching. 

 

Fixed it. ;-)


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#15 sadmanonatrain

sadmanonatrain
  • 6502
  • LocationUnited Kingdom of Great Britain and Northern Ireland

Posted 12 November 2014 - 06:35 PM

A working solution!

 

Batteries.JPG

 

A new trace diagram:

 

Macintosh IIx Switich Traces Diagram.jpg

 

 


Macintoshes liberated:
128k, LCIII, SE, SE/30, Classic II, Performa 200, 5200, PowerMacintosh G3, IIfx, IIci, Quadra 900/950
PowerBook G3, PowerBook 140/145/145b/170/180/180c, PowerBook G4 12/17
iMac G3 Blueberry/Graphite, iMac G5, PowerMac G4 QS/MDD

#16 max1zzz

max1zzz
  • 68000
  • LocationSurrey, England

Posted 12 November 2014 - 06:52 PM

Ditto - that was the trace open on my proto IIx

 

I really need to get that some batteries for it and see if it's power on circuitry actually works

 

Anyway, I'm glad to see you have it fully working :)


68K: Plus, LC, LCII, IIci, Perf 450, Perf 630, Duo 230
PPC: Perf 6200, PM 8600, PB 1400, G3 DT x2, G3 B/W, iBook G3 500, iMac G3 SL, G4 Sawtooth, G4 QS, iMac G4 700, PB G4, PM G5, Xserve G4 Trayload
Intel: Early '08 MBP

#17 CC_333

CC_333
  • 68LC040

Posted 24 November 2014 - 12:16 AM

Huh, this reminds me that I have two Mac IIx board that need recapping.

 

Anyone care to take a look at them as part of this apparent research project?

 

c


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13" --- Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others... --- Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users