Hello.
What is the purpose of this spacer on the Toastrack?
Does it have to withstand higher temperatures?
Thanks!
128K Toastrack spacer on top of RX box
Re: 128K Toastrack spacer on top of RX box
It is to protect the lead of the keyboard connection ...
Re: 128K Toastrack spacer on top of RX box
Got it. So, no high temps and I can use pretty much any soft foam material to replace it with.
Thanks!
Thanks!
- 1024MAK
- Posts: 5103
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: 128K Toastrack spacer on top of RX box
If the membrane tails are close to or touch either the modulator or the heatsink for the 7805 voltage regulator, this can cause various weird faults.
The case of the modulator and the heatsink are electrically connected to the 0V/GND of the system. This affects the signals in the keyboard membrane circuitry.
If you don’t have a ‘rubber’ foot, or ‘foam pad’, use four layers of insulation tape.
Mark
The case of the modulator and the heatsink are electrically connected to the 0V/GND of the system. This affects the signals in the keyboard membrane circuitry.
If you don’t have a ‘rubber’ foot, or ‘foam pad’, use four layers of insulation tape.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: 128K Toastrack spacer on top of RX box
On a 128K Toastrack the heatsink is on the right side outside the case mounted. So there will be no connection with the membrane tails, isn't it?
- 1024MAK
- Posts: 5103
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: 128K Toastrack spacer on top of RX box
Yes, on this model, the heatsink is not a problem.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.