More useles Tech support: need Toshiba schematic PA750L au..

Joe

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Duh ! Somebody get me a frying pan !
"you dont need a manual to use it sir, you plug it in the cigarette lighter"

I need schematic for TOSHIBA: PA750L auto adapter (18 volt 4 pin) its not on
the websight
Not ONE person at Toshiba's "expert" tech support knows what a schematic,
pin out, DC-DC converter even is !!!
Well at least they were VERY nice and spoke understandable English

I want to convert the voltage regulator and 4 pin current sensing circuitry
down to 16VDC for IBM ThinkPad's.

-Joe
Remove NOSPAM to email
 
G

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"Joe" <joe.amp@NOSPAMverizon.net> wrote in message
news:qwmzc.28102$Xw3.5554@nwrdny03.gnilink.net...
> Duh ! Somebody get me a frying pan !
> "you dont need a manual to use it sir, you plug it in the cigarette
lighter"
>
> I need schematic for TOSHIBA: PA750L auto adapter (18 volt 4 pin) its not
on
> the websight
> Not ONE person at Toshiba's "expert" tech support knows what a schematic,
> pin out, DC-DC converter even is !!!
> Well at least they were VERY nice and spoke understandable English
>
> I want to convert the voltage regulator and 4 pin current sensing
circuitry
> down to 16VDC for IBM ThinkPad's.
>
> -Joe
> Remove NOSPAM to email
>

You have got no chance!
Schematic drawings/diagrams of the type you require are
not available in the public domain. I believe they are all
"Company Confidential" or some other restrictive caveat.

From the info in your post you sound like a guy who knows
a bit about electronics - which is a lot more than any of the
tech support people - and a lot of authorised service engineers!

I reckon your best bet would be to find a friendly electronics
engineer who has experience in doing this kind of job.....
It's either that or check Ebay for a Thinkpad PSU!

Michael in Glenrothes, Scotland


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zebedee

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If It's any help, I have an old IBM 760EL charger that's broken that can be
played with?

--
Yours

Zebedee

(Claiming asylum in an attempt
to escape paying his debts to
Dougal and Florence)
 

Andrew

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In comp.sys.laptops Joe <joe.amp@nospamverizon.net> wrote:
: Duh ! Somebody get me a frying pan !
: "you dont need a manual to use it sir, you plug it in the cigarette lighter"

: I need schematic for TOSHIBA: PA750L auto adapter (18 volt 4 pin) its not on
: the websight
: Not ONE person at Toshiba's "expert" tech support knows what a schematic,
: pin out, DC-DC converter even is !!!
: Well at least they were VERY nice and spoke understandable English

: I want to convert the voltage regulator and 4 pin current sensing circuitry
: down to 16VDC for IBM ThinkPad's.

And you would go to all this trouble instead of spending $15 for an AC
power inverter because - ?

Andrew
--
----> Portland, Oregon, USA <----
*******************************************************************
----> http://www.bizave.com <---- Photo Albums and Portland Info
----> To Email me remove "MYSHOES" from email address
*******************************************************************
 

Joe

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No No, You've got that all messed up LOL
Im NOT talking about abundant Stinkpad 360-570E AC adapter's !

I got a case 10 new in the box DC AUTOMOBILE adapters for nothing with some
ThinkPad's I baught.
We use them for GPS (boating) and 802.11B WAN boat to house for
summer....got it ?

-Joe


"Andrew" <usenetMYSHOES@bizaveMYSHOES.com> wrote in message > And you would
go to all this trouble instead of spending $15 for an AC
> power inverter because - ?
>
> Andrew
 

Joe

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Thanks, Like somebody said:
I finally got through to Toshiba and was told only authorized service tech's
get info like that.

Look's like I'm going to have to buzz it out and do it the long way.
It usually involves changing a Zener diode or Regulator IC in the secondary
regulator, sometimes you just connect a DMM and turn a trim pot


"Zebedee" <abuse@127.0.0.1> wrote in message
news:40ce142b$0$21792$afc38c87@news.ukonline.co.uk...
> If It's any help, I have an old IBM 760EL charger that's broken that can
be
> played with?
>
> --
> Yours
>
> Zebedee
>
> (Claiming asylum in an attempt
> to escape paying his debts to
> Dougal and Florence)
>
>
>
 

Andrew

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In comp.sys.laptops Joe <joe.amp@nospamverizon.net> wrote:
: No No, You've got that all messed up LOL
: Im NOT talking about abundant Stinkpad 360-570E AC adapter's !

I'm not talking about an AC adaptor, either.

: I got a case 10 new in the box DC AUTOMOBILE adapters for nothing with some
: ThinkPad's I baught.
: We use them for GPS (boating) and 802.11B WAN boat to house for
: summer....got it ?

Yep. Why can't you just buy a power inverter to plug into the
cigarette lighter to provide AC power, so you can power your laptop or
GPS or anything else you want from a DC source? Is it really worth
getting a schematic and messing with the electronics?

Andrew
--
----> Portland, Oregon, USA <----
*******************************************************************
----> http://www.bizave.com <---- Photo Albums and Portland Info
----> To Email me remove "MYSHOES" from email address
*******************************************************************
 

Joe

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I have 10 laptops ! and 10 of these 18 volt DC chargers
The problem is worth solving.
I have reworked switching inverters and power supplys before.
........not buying 10 150 watt 12VDC to 110VAC inverters to run 28 watt AC
chargers

2nd problem is on a boat even the smallest 12VDC -110VAC 150 Watt inverter
idols at 8 amps (at 12 VDC that's around 90 watts per hour)...to drive a 28
watt inverter ?
Converting 2 times through even the most efficient oscillators and torriod
core transformers wastes to much power. We run solar or wind power with
deep cycle batteries here, starting the engine is a last resort.

I could build a 10.6 NIMH series charger/supply and go straight into the
laptop 10.6 volt battery rails using some isolation diodes, thermal cutoff.
That's "Coyote hacky" and more time consuming,
-Joe


"Andrew" <usenetMYSHOES@bizaveMYSHOES.com> wrote in message
> Yep. Why can't you just buy a power inverter to plug into the
> cigarette lighter to provide AC power, so you can power your laptop or
> GPS or anything else you want from a DC source? Is it really worth
> getting a schematic and messing with the electronics?

>
> Andrew
> --
> ----> Portland, Oregon, USA <----
> *******************************************************************
> ----> http://www.bizave.com <---- Photo Albums and Portland Info
> ----> To Email me remove "MYSHOES" from email address
> *******************************************************************
>
 
G

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Andrew wrote:
> In comp.sys.laptops Joe <joe.amp@nospamverizon.net> wrote:
> : No No, You've got that all messed up LOL
> : Im NOT talking about abundant Stinkpad 360-570E AC adapter's !
>
> I'm not talking about an AC adaptor, either.
>
> : I got a case 10 new in the box DC AUTOMOBILE adapters for nothing with some
> : ThinkPad's I baught.
> : We use them for GPS (boating) and 802.11B WAN boat to house for
> : summer....got it ?
>
> Yep. Why can't you just buy a power inverter to plug into the
> cigarette lighter to provide AC power, so you can power your laptop or
> GPS or anything else you want from a DC source? Is it really worth
> getting a schematic and messing with the electronics?
>
> Andrew
> --
> ----> Portland, Oregon, USA <----
> *******************************************************************
> ----> http://www.bizave.com <---- Photo Albums and Portland Info
> ----> To Email me remove "MYSHOES" from email address
> *******************************************************************
>
Hi,
So, you seem to know it all and why bother calling tech support?
Tony, VE6CGX
 

Joe

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Read the topic
Eh, figures !
The topic I posted a topic about schematic acquisition.
Not a sparring match, Spanish inquisition or detailed engineering level
discussion on switching supplies.As far as you question: A schematic will
make what I want to do easier that's all.
Why not go fire up the HW-101, Yaesu whatever and go hassle the gearheads
on the 75 meter splinter group Eh !

-Joe,


"Tony Hwang"> Hi,
> So, you seem to know it all and why bother calling tech support?
> Tony, VE6CGX
>
 
G

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Joe wrote:
> Read the topic
> Eh, figures !
> The topic I posted a topic about schematic acquisition.
> Not a sparring match, Spanish inquisition or detailed engineering level
> discussion on switching supplies.As far as you question: A schematic will
> make what I want to do easier that's all.
> Why not go fire up the HW-101, Yaesu whatever and go hassle the gearheads
> on the 75 meter splinter group Eh !
>
> -Joe,
>
>
> "Tony Hwang"> Hi,
>
>>So, you seem to know it all and why bother calling tech support?
>>Tony, VE6CGX
>>
>
>
Hmmm,
Ever hear of reverse engineering? For the time waiting for tech support
answer your call waiting, listening to music, I'd have done it myself.
Who is gonna need a shcematics for such a simple stuff? I just picked
up a broken guitar amp made in the '70s from eBay DIRT cheap. Blowing
main fuse was symptom. When I was trying to find a schematics, they'd
charge 20.00 for a copy. I did not buy a copy. After spending two
evenings, it's back
up and running. My guitar playing son is very happy having another GREAT
sounding amp for the fraction of going price. If I sell it, I'd make
profit of 4 times the price I paid including shipping.
Maybe you think you know something but not that well?(no offence intended).
Tony, VE6CGX
(class of '66, retired EE)
P.S. Do you know how to work on tube circuits since HW-101 is mentioned?
 

Joe

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Yep, my specialty is restoring R-390's, not including my own guitar amps
Now your comparing a switching supply with referencing circuitry for UVP,
OVP and OCP (protection) to working on vintage glass audio ?
"Plonk"

I'll have to sit and buzz the buggers out when I have time, Im not retired
..........will post the results (about 2 weeks).

-Joe


"Tony Hwang" <dragon40@shaw.ca> wrote in message
news:FHvzc.720903$Pk3.401408@pd7tw1no...
> Hmmm,
> Ever hear of reverse engineering? For the time waiting for tech support
> answer your call waiting, listening to music, I'd have done it myself.
> Who is gonna need a shcematics for such a simple stuff? I just picked
> up a broken guitar amp made in the '70s from eBay DIRT cheap. Blowing
> main fuse was symptom. When I was trying to find a schematics, they'd
> charge 20.00 for a copy. I did not buy a copy. After spending two
> evenings, it's back
> up and running. My guitar playing son is very happy having another GREAT
> sounding amp for the fraction of going price. If I sell it, I'd make
> profit of 4 times the price I paid including shipping.
> Maybe you think you know something but not that well?(no offence
intended).
> Tony, VE6CGX
> (class of '66, retired EE)
> P.S. Do you know how to work on tube circuits since HW-101 is mentioned?
>
 
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