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The Memotech MTX Series |
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Memotech Hardware Repairs
This page provides details of some hardware fault finding and
repairs on mine, and other's, Memotech computers. This page
discusses some of the more serious problems that can occur with
the MTX, your problem may be much more straightforward. You
might like to take a look at this page
too.
I hope you find the pages useful, of course, whilst the
symptoms of a fault with your MTX may look similar to one, or
more, of the faults listed here, there is no guarantee that the
"fixes" described here will work for you.
The topics here are based on actual experiences for fault
finding and repair of Memotech MTX computers, but before you
start, you really should download a copy of the Memotech
MTX500/512 Service Manual from my
Manuals page.
Component Data
Sheets - A selection of datasheets for components
used on various Memotech boards
Disassembly
Getting access to the internals of Memotech hardware can be a
little awkward, these notes may help :
Repair Procedures
MTX Computer Board
System RAM - Replacing the On-board RAM
System RAM - Using Andy's Replacement Memory Card
System ROMs
Video RAM
Miscellaneous
MTX
Overheating Resistor - One MTX Power
Problem
Black Screen,
No Tone - Clock failure, and other, unrelated issues,
including a sound problem
Black Screen,
With Constant Tone - Bad ROM contacts and unrelated keyboard
problem
PAL Video
Board Problem - "Rolling" screen with "odd" colours
Sound Problem - Constant Tone from an otherwise working
system
MTX
Electrolytic Capacitor Replacement - In pictures (Photos
from David Kimberlin-Wyer)
MTX Keyboard
MTX
Keyboard Problems - Some common and not so common problems
MTX Keyboard
Problem - Spurious key detection
MTX Speculator
Repairing my Speculator - hopefully!
- ongoing
FDX Disc System
FDX Power Supply Repair - One Common
FDX PSU
Problem
FDX Power Supply
Replacement - Using a PC PSU (Just an example,
more complicated than needed)
My FDX System Fault Finding &
Repair - A bit of a saga, but it came good in the end!
FDX Colour
Display Problem - Incorrect
Colour Display
Video Wall System
DDFS
Power Supply - Failed - ongoing
Spare Parts
The Memotech MTX is now over 30 years old and many of its
components are obsolete, it is still possible to obtain most
components but they seem to be getting more expensive as they
become rarer. I have a very limited quantity of a few components
available should you be interested in sourcing them from the UK
at, what I believe to be, reasonable prices
See here for details
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