Caple C871i Manual de usuario descargar pdf (Pagina 376)

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Apple II Computer Info

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### FILE : power.supply

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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 3826 bytes 3 KB

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Path:

blue.weeg.uiowa.edu!news.uiowa.edu!uunet!tcsi.tcs.com!agate!msuinfo!harbinger.cc.m

onash.edu.au!yarrina.connect.com.au!werple.apana.org.au!boombox.apana.org.au!tlp!p

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From: [email protected] (Peter Maloney)

Newsgroups: comp.sys.apple2

Subject: Re: IIe power supply problems

Message-ID: <[email protected]>

Date: Fri, 02 Sep 94 16:53:18 PDT

References: <[email protected]>

Organization: The Lower Planes BBS

Lines: 45

[email protected] (Joe Hass) writes:

> Wizards of the Net:

> I'm trying to help a local elementary school keep their IIe's running and

> have found what appears to be a bad power supply.

> The machine will boot properly when it's warm but the power supply won't

> come up if it's cool. When it's cool the +5 output is at about 1.1V, the

> -5 is at about -1.1V and the +/- 12V outputs are proportionately low.

> Sometimes, if it's not too cool, the voltages will slowly rise and then

> the supply will suddenly come to life and be fine. I know it's the supply

> and not the motherboard because I've swapped them with another machine,

> and I've tried heating the supply alone with a hair dryer. Also, when the

> supply is cool but disconnected from the motherboard the positive voltages

> are about 1% above nominal and the negative voltages are about 10% more

> positive than nominal.

> I can't see any cold solder joints or obviously bad components. The

> machine is of 1985 vintage and the supply was made by Astech.

> Any diagnostic suggestions would be appreciated, as well as pointers to

> a low-cost vendor for a new supply. I'm an EE so I have a passing

> familiarity with switching power supplies, but I don't have the schematics

> for this guy.

> TIA,

> Joe

> --

> Joe Hass | library clever_sigs; | My opinions are my o

> [email protected] | use rock_and_roll.verses.ALL; | not Sandia's and

> Sandia National Labs | use lineprinter.art.ALL; | not the DOE's

Theis problem is usually caused by a failed capacitor (220uf/16V?)

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 376 of 572

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Caple C871i Manual de usuario Pagina 376

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Caple C871i Manual de usuario Pagina 376

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