Search found 3 matches

by lbaeza
Thu Dec 05, 2019 2:39 pm
Forum: Hardware
Topic: Help with Issue 6A voltages check
Replies: 4
Views: 169

Re: Help with Issue 6A voltages check

A voltage drop of the order of 3mV to 3.6mV is nothing to worry about given that the printed circuit board (PCB) in a ZX Spectrum does not use a ground plane and therefore some of the 0V/GND/ground tracks are not particularly wide. Hi Mark Thanks for the clarification, so there's nothing to worry a...
by lbaeza
Thu Dec 05, 2019 2:36 pm
Forum: Hardware
Topic: Help with Issue 6A voltages check
Replies: 4
Views: 169

Re: Help with Issue 6A voltages check

What made you start repairing the machine to begin with? Was it faulty? What were the faults and what signs did you observe before attempting to repair it? Hi The usual stuff: garbled characters on screen in multiple colors, blinking...unable to get to the Sinclair Research welcome message... Kind ...
by lbaeza
Thu Dec 05, 2019 1:19 am
Forum: Hardware
Topic: Help with Issue 6A voltages check
Replies: 4
Views: 169

Help with Issue 6A voltages check

Hi there This is Luis, a fan of the ZX Spectrum from Chile, South America. This is my first post. Currently I am working on fixing the bad volts on my ZX Spectrum Issue 6A. For that matter, I have removed all RAM chips, replaced both TR4 and TR5, and replaced all electrolitic capacitors. After this,...