Caple C871i Manual de usuario descargar pdf (Pagina 392)

Apple II Computer Info

X GND +12V (pin 50) X X (pin 1)

X GND X X

X +5V .

X +12V .

X X X

GND (pin 26) X X (pin 25) +5V

.... Ground Plane Area (plug shields, etc. connected here) ....

|______________ Back Edge of Motherboard _________________________

A good way to make sure you know what's where is to use an Ohm meter

to check Resistance from pin 26 (GND) to a metal plug shield near the back

of the motherboard. (Set your meter to Ohms X1. Touch one meter lead to pin

26 and the other to a metal plug shield. Resistance should read nearly

zero. Reverse the leads and repeat the check. Again, Resistance should read

nearly zero.)

Repeat the check for R between pin 26 and the GND points on the Power

Connector socket. R should be nearly zero. Using a marker pen or white-out,

mark pin 26 (GND) on Slots 3 and 7. Also mark the GND points of the Power

Connector socket.

GND: On the bottom side of the motherboard, connect a Black #16 gauge wire

from one of the Ground points of the Power Connector socket to the Ground

plane area near the back of the motherboard. Run a short Black #16 gauge

wire from pin 26 of Slot 3 to the Ground plane; run a short Black #16 gauge

wire from pin 26 of Slot 7 to the Ground plane. (You may need to scrape

through green insulating lacquer to solder to the Ground plane area.)

+5V: On the bottom side of the motherboard, connect two #16 gauge Red wires

to the +5V point of the Power Connector socket. Connect the other end of

one +5V Red wire to pin 25 of Slot 3; connect the other end of the second

+5V Red wire to pin 25 of Slot 7.

+12V: If you have any cards which are likely to draw heavily on the +12V

line, then, on the bottom side of the motherboard, run a #18 gauge White

wire from the +12V point of the Power Connector socket to pin 50 of the

Slot in which the card is normally located. Otherwise, just run an #18

gauge White wire from the +12V point of the Power Connector socket to pin

50 of Slot 7.

Check your connections. One quick check is that the GND and +5V wiring

to Slots 3 and 7 should be Black, Red (moving left to right) and Slots 3

and 7 should 'look the same'. Any +12V wire should be on the same side of

the Slot (i.e. the same column of pins) as GND. None of the wires should be

connected to a middle pin on any Slot.

Notes:

1. All wires are insulated.

2. When cutting wires, allow enough slack to permit routing each wire. You

want to avoid having a wire rest against pointy connections on the

motherboard. Route wires away from motherboard mounting holes and around

places where the bottom of the case supports the motherboard.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 392 of 572

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Caple C871i Manual de usuario Pagina 392

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Caple C871i Manual de usuario Pagina 392

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