Caple C871i Manuale Utente Scaricare il pdf (Pagina 51)

Apple II Computer Info

plug> Specify whether the barrel plug center pin should have positive or

negative polarity.

(h) Only six wires are used on the 7-pin Molex-7 plug; an unused space is

located between a black ground wire and the orange (+5 vdc) wire. This

empty space is plugged with adhesive caulk and a polarizing plug.

Blocking the unused third hole on the plug is a safely feature to

eliminate the electrical risk of inserting the Molex-7 plug off-center on

the motherboard connector.

DETAILED INSTALLATION AND CHECKING PROCEDURE

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

(a) Carefully unwrap the power supply. Use no knife or blade.

SHAKE

the power supply gently to judge whether any movable foreign objects are

rattling inside the unit.

(b) With all power OFF, and after discharging any static, remove

the

present internal power supply --- a plastic clip at the keyboard end of

the

motherboard holds it in. Pry the plastic retaining clip forward, and lift

the original IIgs power supply out of the way.

Molex-7 connector on the motherboard. A pliers may be used, pulling

SLOWLY

and CAREFULLY in an upward direction. Do not break off any of the six

pins

on the male motherboard connector. The spring ramp-grabbers on the right

edge may need to be deflected with a knife or ruler so that the plug can

released.

(d) Use a DC voltmeter to CHECK THE VOLTAGES of the wires on the

Molex-7 plug (+5v, +12v, -12v, and -5v) before connecting the IBM supply

the IIgs. [This is important!] The probes of the DC voltmeter are likely

too

large to fit the small openings on the Molex-7 plug. To test the voltage,

clip two segments of a paper clip and insert them temporarily in the

pin-windows of the Molex-7 plug, taking care to avoid short circuits.

(Crimp pins in the Molex-7 plug can be damaged by thick voltmeter probes;

use paper clip sections to contact the crimp pins. Touch the voltmeter

probes to the paper clip segments to measure the voltage. Take care to

avoid shorting the power supply.

(e) Place the IBM power supply on the floor under the computer

table

-- position it so that there is no danger of objects (paper clips, pens,

etc.) falling off the table into a fan opening, nor of liquids being

spilled

into it. This is important: paper clips could jam the fan or hit the

motherboard and fry the power supply.

(f) Route the 6-wire cable up to the back panel of the IIgs, and

into

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 51 of 572

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Caple C871i Manuale Utente Pagina 51

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