Faulty CZ1016 Rampack
Faulty CZ1016 Rampack
Well. In fact it is a Sinclair Issue 2 rampack inside that was rebranded and sold in Argentina ...
It is my original almost 35 years old rampack but is not working..
Voltages rails on the 4116s are ok.
Pin 2 to 14 have continuity in all of the ram IC..
Pin 2 to all of the corners (0v, -5v, +5v, +12v) have no continuity on any of them .. some current is measured but about 1700ohm over +12v for example..
And no continuity between pins 2 either...
I am waiting a lot of 4164s I bought from china to replace them but now I think that there may be another problem..
Thanks
It is my original almost 35 years old rampack but is not working..
Voltages rails on the 4116s are ok.
Pin 2 to 14 have continuity in all of the ram IC..
Pin 2 to all of the corners (0v, -5v, +5v, +12v) have no continuity on any of them .. some current is measured but about 1700ohm over +12v for example..
And no continuity between pins 2 either...
I am waiting a lot of 4164s I bought from china to replace them but now I think that there may be another problem..
Thanks
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
Re: Faulty CZ1016 Rampack
Please post a photo of your Rampack PCB. It makes it much easier to determine which PCB version it is.
Kind regards
Paul
Kind regards
Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: Faulty CZ1016 Rampack
Hi Paul,
Is exactly like this one posted here..
I may take my own pictures later
Than you
https://www.sinclairzxworld.com/viewtop ... 340#p24322
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
Re: Faulty CZ1016 Rampack
You already got some hints in the linked thread
Are all PCB interconnects still reliable? Mine always break at opening the case
Are all PCB interconnects still reliable? Mine always break at opening the case
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: Faulty CZ1016 Rampack
Yes, in fact I resoldered a new ribbon cable and retested it all the points with a multimeter
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Faulty CZ1016 Rampack
With RAM packs, these can be a right pain to fault find. One method is to put an adapter in between the computer and the RAM pack so that (1) the computer’s internal memory is not disabled, and (2) the RAM pack is remapped to a different area of memory.
This adapter normally needs a male edge-connector (PCB) and an edge-connector socket. But it is possible to use sellotape to insulate selected edge-connector contacts on the computer. Then use temporary wires and a simple circuit to reroute some signals.
Then it is possible to use BASIC to write and read test data to the RAM pack.
Alternatively, if you have an oscilloscope or logic analyser, these tools can help to ‘see’ what’s going on with the signals.
Mark
This adapter normally needs a male edge-connector (PCB) and an edge-connector socket. But it is possible to use sellotape to insulate selected edge-connector contacts on the computer. Then use temporary wires and a simple circuit to reroute some signals.
Then it is possible to use BASIC to write and read test data to the RAM pack.
Alternatively, if you have an oscilloscope or logic analyser, these tools can help to ‘see’ what’s going on with the signals.
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: Faulty CZ1016 Rampack
Thank you..1024MAK wrote: ↑Sun Mar 22, 2020 10:06 am With RAM packs, these can be a right pain to fault find. One method is to put an adapter in between the computer and the RAM pack so that (1) the computer’s internal memory is not disabled, and (2) the RAM pack is remapped to a different area of memory.
This adapter normally needs a male edge-connector (PCB) and an edge-connector socket. But it is possible to use sellotape to insulate selected edge-connector contacts on the computer. Then use temporary wires and a simple circuit to reroute some signals.
Then it is possible to use BASIC to write and read test data to the RAM pack.
Alternatively, if you have an oscilloscope or logic analyser, these tools can help to ‘see’ what’s going on with the signals.
Mark
I can get an oscilloscope but I I really don't know what to check for..
That interface sounds interesting.. where can I find it. ?
Regards
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Faulty CZ1016 Rampack
Repairing RAM packs, other useful threads: here and here.
There are no ready made adapters or kits for an adapter, but there are details of the circuitry in this thread. Do read it all the way through, as a diode is needed that is not shown in the first diagram.
An oscilloscope will enable you to see the input and output signals of each DRAM chip. It can also be used to see if select, enable and other control signals are present.
Mark
There are no ready made adapters or kits for an adapter, but there are details of the circuitry in this thread. Do read it all the way through, as a diode is needed that is not shown in the first diagram.
An oscilloscope will enable you to see the input and output signals of each DRAM chip. It can also be used to see if select, enable and other control signals are present.
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: Faulty CZ1016 Rampack
Great.. thank you!!!1024MAK wrote: ↑Mon Mar 23, 2020 10:38 pm Repairing RAM packs, other useful threads: here and here.
There are no ready made adapters or kits for an adapter, but there are details of the circuitry in this thread. Do read it all the way through, as a diode is needed that is not shown in the first diagram.
An oscilloscope will enable you to see the input and output signals of each DRAM chip. It can also be used to see if select, enable and other control signals are present.
Mark
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come