ZXSpectrum+_UpgradeInstructions.pdf

2X Spectrum +

UPGRADE

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PLEASEREAD THESE INSTRUCTIONS

BEFORE STARTING ASSEMBLY

If, having read the instructions,

you feel unable to attempt

assembly of the

kit, or if you get stuck halfway through

doing it and can’t complete

it,

simply pack up the kit and your existing Spectrum

and return it to us c/o:

Sinclair Research Ltd

Upgrade

Department

Stanhope

Road

Cam berley

Surrey GUI 5 3PS

Enclose f IO, and we will complete

it for you.

WHAT YOU WILL NEED

Very few tools are needed. The most important is a crosshead screwdriver

with a no 1 size point. You may also need an ordinary, small screwdriver.

There is not a great deal of soldering to be done. The soldering iron you

use must be fitted with a fine tip and be rated in the region of 15 to 25

watts; temperature controlled irons can have a higher wattage.

Last but not least, try to find a well-lit, uncluttered space where work can

proceed uninterrupted, and where small parts will not get lost. The

keyboard contacts are contained in a sealed membrane, which is

unaffected by dust, but the computer circuitry must not be exposed to dirt

and spilt liquids while it is out of the case. It is a good idea to provide

something

soft to lay the case mouldings

on, to avoid them

being

scratched during assembly.

WARRANTY NOTE

The warranty on your Spectrum is suspended from when you dismantle it until

your upgraded Spectrum + is in full working

order.

When your Spectrum + is working

the warranty

resumes, effective from the

purchase date of your original Spectrum.

Any repairs which are required between the time your Spectrum is dismantled and

your upgraded Spectrum + reaches full working

order ARE NOT COVERED

THE WARRANTY;

as such they are your responsibility.

PARTS LIST

Check that you have all of the following items in your ZX Spectrum + kit BEFORf

you start dismantling your present machine.

1 Fully assembled

Spectrum +

keyboard.

1 22K resistor

1 Case-bottom

1 Resetswitch

with lead

4 Rubber feet

1 Heatsink

2 Screws,

pan head,

6.5mm long

3 Grey foam pads

1 ZX Spectrum +

UserGuide

1 Screw,

countersunk,

13mm long

1 ZX Spectrum +

CompanionCassette

2 Legs

1 Instruction

Leaflet (this)

@ 1w

7 Screws,

pan head,

8mm long

1 blank

Warranty Seal

2 Plasticsprings

If you have a warranty sealon your ZX Spectrum pleasecopy the number on to

the enclosedblank labeland stick this to the bottom of your new case.

If any of these partsare missing,pleasecontact uson 0276 685311 and tell us

what you need.

STEP Dismantling your Spectrum

1 Turn your Spectrum upside down. Locate and undo the five screws which hold it

together. There may be a warranty label stuck over one of the screws: just peel it

off-there is a new one stuck to the Spectrum + case-bottom (see Warranty

Note). Turn the computer the right way up again, and carefully lift up the top. You

will see two thin ribbons connecting the top and bottom halves together. These

plug into two black sockets situated on the circuit-board

in the bottom half; gently

ease them out and put the case-top to one side.

The circuit-board is held by a single screw, located in the middle of the board and

about a third of the way back. Remove this screw

and the board may be lifted out.

Put the case-bottom

to one side.

Issue 1 Issue2 - Issue 3

Look for your Spectrum’sIssuenumber printed somewhere on the circuit-board.

Normally it will be along the front edge of the board, but early modelsmay have it

at the back.

If your Spectrumiseither an IssueOne or an IssueTwo you will need to exchange

the existing heatsinkwith the one provided in the kit (seeStep 2). For IssueThree

and above, no modificationsare necessarybecausethe heatsink isin a different

place (at the back of the board) -you should now go to Step 3.

Changing the Heatsink - for Issue One and

Issue Two only

The heatsink isthe oddly shapedpieceof aluminiumin the bottom right hand

corner of the board; it isheld in by the mounting screwof the voltage regulator

(the black plasticblock sitting on one corner of the heatsink).To replaceit simply

undo thisscrew,taking care not to losethe nut and washer,and carefully remove

the heatsink. Do not bend the voltage regulator’sleadsmore than necessarywhen

doing this.

STEP

The new heatsink must now be fitted - unlessyou have an IssueOne

in which caseyou must fit the reset switch first, so go to Step 3. If there

wasa triangular card insulatorbetween the heatsink and the board, rememberto

replaceit (not all machineshave or need this). Tighten the regulator fixing bolt

firmly, do not bend the regulator leadsexcessivelyand do not run the Spectrum

without its heatsink.

STEP Fitting the reset switch

The reset switch is supplied with its leads already soldered on; all that needs to be

done is to connect thk’other end to the Spectrum circuit-board. The switch is

always connected across the component labelled C27, but the position of this

varies from one issue to another, and later Spectrums have a place already set

aside for connecting the switch.

Find the connection points relevant to your computer by referring to

the appropriate diagram, and carefully solder the bare ends of the reset switch

leads eitherto the wire ends of C27 itself, or to the ‘pads’ provided on the board.

you cannot solder, get someone who can to.help you, or simply omit the reset

switch altogether. Do not wind the ends of the wire round C27’s leads without

soldering; if they come loose later on the computer could easily be damaged. It is

important that you do not let solder spread across the circuit board. If the silver

‘tracks’ on the circuit board are connected by the solder the computer

may not

work

properly, because part of the circuitry is shorting out.

Issue 1 Issue2 Issue 3

Note: If you have an IssueOne you should now fit the new heatsink (seeStep 2)

STEP Testing the keyboard

You can now test the computer. Placethe circuit-board on the working surface,

which must be non-conducting to prevent short circuits. If you are not sureif the

surfaceyou are working on isnon-conductive, put three or four sheetsof

newspaperdown first. There are no dangerousvoltages presenton the Spectrum

board, so it isquite in order to run it whilst out of itscase.

The circuit-board should be positioned so that the connecting plugsare facing

away from you. Take the Spectrum + keyboard and place it on its edge in front of

the circuit-board sothat the keys are facing you and the ventilation grill is

uppermost.

Look over the top of the keyboard at the circuit-board. The two ribbonsfrom the

keyboard need to be plugged in. The ribbonshave a short sectionat the end

which isstiffened by a plasticsheetto make them easierto insert- your original

Spectrum keyboard may not have had these. Hold each ribbon at the point where

the stiffened section ends, and plug it into the socket on the board in the same

way that the original ribbonswere connected. Notice that one ribbon hasfive

stripesand goesin the left hand socket, while the other haseight stripesand goes

in the right hand socket. With the case-topthe right way round each ribbon

shouldfall directly in line with the appropriate socket.

Keyboard

RibbonCable

Base

not shown for clarity.

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