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ZX81 PDF даташит

Спецификация ZX81 изготовлена ​​​​«sinclair» и имеет функцию, называемую «Service Manual And Assembly Instructions».

Детали детали

Номер произв ZX81
Описание Service Manual And Assembly Instructions
Производители sinclair
логотип sinclair логотип 

43 Pages
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ZX81 Даташит, Описание, Даташиты
This technical manual was OCR'ed for the
Sinclair world by Andy Dansby.
[email protected] All intellicial
information contained inside this technical
manual is the property of Amstrad.









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ZX81 Даташит, Описание, Даташиты
IMPORTANT:
Read through the
instructions before you
start assembly.
If anything seems unclear or difficult, contact us for advice before
going ahead.
1. PREPARATION
You will need a clean, dry and well lit workspace in which to assemble your kit. If possible, try to find
somewhere where the parts can stay undisturbed in case you do not finish the kit all at once. It is a
good idea in any case to split the work up - say assemble the circuit board one eueninn_tben.tffst jt. and
put the case together the next evening You will need these tools
(a) A light electric soldering iron, say 15 to 25 watts with a fine tip
{b} Fine gauge solder with resin flux core; NOT acid flux.
(c) A pair of sharp sidecutters.
(d) A 'Pozidriv' screwdriver with a No. 1 point.
(e) A medium size ordinary screwdriver and/or a 4B A spanner.
The following items are optional, but useful -
(a) A magnifying glass for examining solder joints and looking for short circuits,
(b) Some desoldenng braid or other solder removing tool. Better still, take care that you put the
components in right the first time - removing them can be very difficult.
(c) A piece of foam is useful to stop components falling out when you turn the board over to solder
them
2. PRECAUTIONS
There are not many integrated circuits (I C s) in the kit, but they are all fairly expensive items and most
of them are susceptible to damage from static electricity. There is no cause for worry if a few
precautions are taken:-
(a) Use the sockets supplied with the k i t - never solder the I.C.s direct to the board - and keep the
I.C.s in their protective packing until you are ready to plug them in.
(b) Never insert or remove the ! C s or do any soldering with power applied to the computer.
(c) Use a soldering iron with a properly earthed bit.
<d) Carpets and clothing of man-made fibres, and synthetic soles on shoes, are prone to building up a
static charge. Earth yourself by touching a large object, preferably metallic, priorto touching the I.C.s If
you do get a shock, try changing your clothes or going barefoot (seriously'}
3. COMPONENT EDENTIFICATION
Before you start assembly, check the components against the component list (section 8) and make
sure you know what each part is. We have tried to cover all different markings of the components, but
variations are possible.
Note in particular that the computer's memory maybe supplied either as two 18 pin I.C.s (IC4a & IC4b)
or as one 24 pin device (IC4), and that assembly is necessarily different for each version.
Some components need to go in one particular way round -
(a) The I C s have one end identified by a notch, and/or a spot or dimpfe next to pin 1 (See fig. 1) Note
that all the ! C s face the same way on the board, i.e. with their notches towards the edge connector.
1









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ZX81 Даташит, Описание, Даташиты
Although the I C. sockets do not need to go any particular way round, you may like to put the bevelled
corner at the notch end of the I.C. position as a reminder, since the semicircie printed on the board will
be covered by the socket in some cases.
(b) The diodes (prefix D) have their + end identified by the band painted on the body - or in the case of
components with several bands, the + end will be the widest band. This corresponds to the flat bar of
the symbol printed on the board. (See fig. 2).
(c) The electrolytic capacitors (C3 & C5}will have a + or - symbol printed on them, and the + wire is
usually longer. (See fig. 3).
(d) The transistors (prefix TR) go in the board as shown by the picture printed at their positions - i.e.
with their rounded corners facing the edge connector.
(e) The jack sockets and modulator need to have their business ends (i.e. where the plug goes in)
facing outwards, away from the components. This should be obvious by inspection of the board and
case.
(f) The regulator (REG) and heatsink need to go in a particular way round -just follow fig. 4.
(g) The keyboard connectors KB1 & KB2 have their pins offset from their centre line, and KB1 goes
the opposite way round to KB2. Make sure that in each case the body of the connector covers up the
component number on the board. (See fig. 5).
. , . ... ... . . - , . . . . ,. . ..
(h) The resistor packs (prefix RP) have a 'common' end marked wltn a whlte dot Thls snould at tne
end marked with a 'C' on the board.
(i) The single resistors, the rest of the capacitors, and the filter X1 may be put in either way round.










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