Sinclair ZX Spectrum+ Upgrade Instructions
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The ZX Spectrum + Upgrade Instructions is Sinclair Research's eight-page leaflet supplied with the kit that converted a rubber-key 16K or 48K Sinclair ZX Spectrum into a Sinclair ZX Spectrum+. It is undated; the hosted copy is a 1999 scan. It gives the parts in the kit and the conversion step by step for board Issues 1, 2 and 3, with drawings of each board showing where to connect the reset switch and the 22 kΩ resistor.
Contents
[edit | edit source]| Section | What it covers |
|---|---|
| What you will need | A No. 1 cross-head screwdriver and a fine-tipped 15 W to 25 W soldering iron |
| Warranty note | The warranty is suspended from dismantling until the upgraded machine works |
| Parts list | The assembled Spectrum+ keyboard, case bottom, 22K resistor, reset switch with lead, heatsink, four rubber feet, three grey foam pads, two legs, two plastic springs, two 6.5 mm pan-head screws, seven 8 mm pan-head screws, one 13 mm countersunk screw, user guide, cassette and blank warranty seal |
| Step 1 | Dismantling: five case screws, the two keyboard ribbons, the single board screw, and finding the board issue number |
| Step 2 | Changing the heatsink, Issues 1 and 2 only, keeping any triangular card insulator |
| Step 3 | Fitting the reset switch across C27, with board drawings for Issues 1, 2 and 3 |
| Step 4 | Testing the keyboard with the board out of the case, and the STOP key test |
| Step 5 | Fitting the 22K resistor across R68 (on the underside for Issue 1, which has no R68) |
| Step 6 onwards | Case-bottom assembly: rubber feet, two 6.5 mm screws at the board's front corners, the reset switch in the left side wall, foam pads, legs and springs, and the final eight screws |
| Problem page | Symptoms and answers, including a random pattern in place of the copyright message from a shorting reset switch |
What this leaflet does not contain
[edit | edit source]There is no circuit diagram or parts list for the board, and no repair procedure for the keyboard membrane itself; those are in the Sinclair ZX Spectrum Service Manual. The board drawings are simplified outlines for locating C27 and R68.
Pages that cite this document
[edit | edit source]- Sinclair ZX Spectrum+ Reset Switch Repair: the reset switch connection, its fitting and the shorting-switch symptom
- Sinclair ZX Spectrum+ Keyboard Membrane Replacement: the case screws
Download: Sinclair ZX Spectrum+ Upgrade Instructions.pdf
Related pages
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