Re: C128 issue

From: Gerrit Heitsch <>
Date: Wed, 4 Oct 2017 07:47:21 +0200
Message-ID: <>
On 10/03/2017 11:05 PM, Terry Raymond wrote:
> Well,
> My fiddling with my flat NTSC C128 this summer I found
> The power regulator (located to right of MMU chip)
> On the output voltage- nothing, but reading OHMS resistance using a digital
> Multimeter that has the OHMS Buzzer reading:
> Power Regulator to GND reading the output voltage should have about 12VDC
> nothing
> Reading just resistance on regulator with buzzer, the buzzer barely 
> tries to beep
> indicating a dead short.
> The SID and VIC Video uses the 12VDC!

The VIC in the C128 doesn't use 12V.

Check the input side of the 7812, you should find about 18V there. Also, 
if the output of the 7812 is shorted, it should run hot.


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Received on 2017-10-04 06:00:03

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