Re: Clock battery and floppy lubrication

From: macmoni <macmoni_at_email.domain.hidden>
Date: Wed, 11 May 2005 08:29:10 +0200

Hi everyone out there !

The clock batteries are 4 convenient Accumulator cells with 1.2 Volts and approx 600mAh - you can replace the 4 serial-connected cells (total=4.8 V) with AAA Size NiCad or NiMH Types.

> When I purchased my Lisa II from Sun many years ago, it has a dead
> clock
> battery, or a broken clock. All I know is that the clock has never
> worked.

But this would probably not the main fault. Normally the leakage from bad batteries causes corrosion of the boards, so you will have to test all connections of the Lisa Board near the batteries. If you're lucky then corrosion will only have destroyed the upper and or lower layer of the board but not the two layers between (known as layer 2 and 3) and you could fix that problem by some soldering. You should first check the two hf transistors nearby the quartz cristal; they are responible for continous sweeping and then the signal goes to an inverter chip which causes a perfect TTL signal. Check this output too with an Oscilloscope. That's all :-)

greetings TOM from Bavaria, the center of europe, the country with the marvellous castles of Koenig Ludwig and the original Octoberfest in munich...
... and last but not least the country of Pope Benedict

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Received on 2005-05-11 00:33:51

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