Caple C871i Uživatelský manuál stáhnout pdf (Strana 377)

100

101

Apple II Computer Info

that sits near the big power transistor. Test it by warming it up

before you power on.

Regds,

Peter M.

[email protected] TLP - The only *REAL* A2 BBS in

Peter Maloney Melbourne

A2 Hardware Freak

Path: blue.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!math.ohio-

state.edu!usc!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!pbauer

From: [email protected] (Paul H Bauer)

Newsgroups: comp.sys.apple2

Subject: Apple II Power Supplies

Date: 28 Nov 1994 04:09:04 GMT

Organization: Massachusetts Institute of Technology

Lines: 21

Message-ID: <[email protected]>

NNTP-Posting-Host: puttanesca.mit.edu

For those of you that have had power supply problems!

This week-end I descided to clean up my work bench and either

repair or throw out a few AII power supplies I had in various states of

disrepair. I made an interesting discovery on two supplies, one an aztec

(?) unit, and the other a dead unit from a late model platinum 2e. The

supply from the platinum unit was dead. After checking almost all of the

semi-conductors and finding them good I finally started looking at the

resistors and found a 100k 1 watt

unit that kick starts the supply was open. Replacing this resistor fixed

the supply. I then looked at the aztec unit. This unit woul sometimes

start but most of the time it would not. I looked at the same resister

(R3) which is a 150k 1 watt resister. I changed this to a 100k 1 watt unit

and the supply works like a champ.

If you have a dead supply you might check these resisters as they

could be the culprit. The resister goes from the + rectified line side to

low voltage oscillator that drives the power switching transistor.

[email protected]

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 377 of 572

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