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LN
Len Novak
Thu, Apr 14, 2022 8:04 PM

I have a Parallax 7400 series, Model 7445 charger converter I pulled out
of my coach and use as a bench test unit.  It just stopped working, not
even the fan is turning.  I pulled the cover off expecting to fine
something burnt, fried, blown, smoking and again nothing.  The internal
fuse and bot external fuses are fine.

Any suggestions before I consign it to the recycle bin?

Thanks,

Len Novak

--
Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that
work and labels you can see! Las Vegas, NV new email: B52srule@gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/

I have a Parallax 7400 series, Model 7445 charger converter I pulled out of my coach and use as a bench test unit.  It just stopped working, not even the fan is turning.  I pulled the cover off expecting to fine something burnt, fried, blown, smoking and again nothing.  The internal fuse and bot external fuses are fine. Any suggestions before I consign it to the recycle bin? Thanks, Len Novak -- Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that work and labels you can see! Las Vegas, NV new email: B52srule@gmail.com http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/
JB
Johnny Bridges
Thu, Apr 14, 2022 9:03 PM

Your friendly VOM is Your Friend.  A/C at the transformer input?  If not, trace back to theA/C input and find where it stops.  A/C into the
transformer, A/C out?  If not, toast.  If so, trace the A/C output to the rectifiers, control sitcuit if any, etc.  They're fairly simple.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs.  They must answer to me in hell

Your friendly VOM is Your Friend. A/C at the transformer input? If not, trace back to theA/C input and find where it stops. A/C into the transformer, A/C out? If not, toast. If so, trace the A/C output to the rectifiers, control sitcuit if any, etc. They're fairly simple. --johnny -- Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell
LL
Len Len
Thu, Apr 14, 2022 11:45 PM

Kinda figured that.  Project for the weekend.

Thanks, Len Novak

On Thu, Apr 14, 2022 at 14:06 Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:

Your friendly VOM is Your Friend.  A/C at the transformer input?  If not,
trace back to theA/C input and find where it stops.  A/C into the
transformer, A/C out?  If not, toast.  If so, trace the A/C output to the
rectifiers, control sitcuit if any, etc.  They're fairly simple.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs.  They must answer to me
in hell


GMCnet mailing list
Unsubscribe or Change List Options:

--

Len and Pat Novak

1978 GMC Kingsley

The Beast II with dash lights that work and labels you can see!

Las Vegas, NV    new email: B52sRule@Gmail.com B52Rule@Roadrunner.Com

http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/

Kinda figured that. Project for the weekend. Thanks, Len Novak On Thu, Apr 14, 2022 at 14:06 Johnny Bridges via Gmclist < gmclist@list.gmcnet.org> wrote: > Your friendly VOM is Your Friend. A/C at the transformer input? If not, > trace back to theA/C input and find where it stops. A/C into the > transformer, A/C out? If not, toast. If so, trace the A/C output to the > rectifiers, control sitcuit if any, etc. They're fairly simple. > > --johnny > -- > Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. > Braselton, Ga. > I forgive them all, save those who hurt the dogs. They must answer to me > in hell > _______________________________________________ > GMCnet mailing list > Unsubscribe or Change List Options: > -- *Len and Pat Novak* *1978 GMC Kingsley* *The Beast II with dash lights that work and labels you can see!* *Las Vegas, NV* new email: B52sRule@Gmail.com <B52Rule@Roadrunner.Com> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/
BH
Bruce Hislop
Fri, Apr 15, 2022 2:27 AM

A google search of the make/model number shows it to be a switching power-supply/charger.  My 40yrs experience doing board level electronic repairs is
its not worth the time to repair a switching power supply.

Troubleshooting you will find the first faulty parts and replace them... then power up and then more smoke comes out!  When you finally get it working
it will fail again a short time later.  If you are in the business of repairing electronics, you will be married to this equipment for free repairs
forever!

Just replace it, move on and enjoy life!

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

A google search of the make/model number shows it to be a switching power-supply/charger. My 40yrs experience doing board level electronic repairs is its not worth the time to repair a switching power supply. Troubleshooting you will find the first faulty parts and replace them... then power up and then more smoke comes out! When you finally get it working it will fail again a short time later. If you are in the business of repairing electronics, you will be married to this equipment for free repairs forever! Just replace it, move on and enjoy life! -- Bruce Hislop ON Canada 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001 My Staff says I never listen to them, or something like that
LL
Len Len
Fri, Apr 15, 2022 2:39 AM

It is a bench unit, pulled out of my GMC years ago.  I’ll play with it for
a bit as nothing was self evident, no smoke, smell, burnt anything,
discoloration, fuses….nothing.  I’ll trace as far as I can and then find a
suitable replacement.  My son has the old buzz box in his coach so there is
hope.  Giant step backwards!

Len Novak

On Thu, Apr 14, 2022 at 19:27 Bruce Hislop bhislop76@gmail.com wrote:

A google search of the make/model number shows it to be a switching
power-supply/charger.  My 40yrs experience doing board level electronic
repairs is
its not worth the time to repair a switching power supply.

Troubleshooting you will find the first faulty parts and replace them...
then power up and then more smoke comes out!  When you finally get it
working
it will fail again a short time later.  If you are in the business of
repairing electronics, you will be married to this equipment for free
repairs
forever!

Just replace it, move on and enjoy life!

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that


GMCnet mailing list
Unsubscribe or Change List Options:

--

Len and Pat Novak

1978 GMC Kingsley

The Beast II with dash lights that work and labels you can see!

Las Vegas, NV    new email: B52sRule@Gmail.com B52Rule@Roadrunner.Com

http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/

It is a bench unit, pulled out of my GMC years ago. I’ll play with it for a bit as nothing was self evident, no smoke, smell, burnt anything, discoloration, fuses….nothing. I’ll trace as far as I can and then find a suitable replacement. My son has the old buzz box in his coach so there is hope. Giant step backwards! Len Novak On Thu, Apr 14, 2022 at 19:27 Bruce Hislop <bhislop76@gmail.com> wrote: > A google search of the make/model number shows it to be a switching > power-supply/charger. My 40yrs experience doing board level electronic > repairs is > its not worth the time to repair a switching power supply. > > Troubleshooting you will find the first faulty parts and replace them... > then power up and then more smoke comes out! When you finally get it > working > it will fail again a short time later. If you are in the business of > repairing electronics, you will be married to this equipment for free > repairs > forever! > > Just replace it, move on and enjoy life! > > -- > Bruce Hislop > ON Canada > 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end > http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001 > My Staff says I never listen to them, or something like that > _______________________________________________ > GMCnet mailing list > Unsubscribe or Change List Options: > -- *Len and Pat Novak* *1978 GMC Kingsley* *The Beast II with dash lights that work and labels you can see!* *Las Vegas, NV* new email: B52sRule@Gmail.com <B52Rule@Roadrunner.Com> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/
LN
Len Novak
Sat, Apr 16, 2022 5:12 PM

After playing with a VOM for a min or so....no ac power on one of the
input terminals. R&R, bit of dielectric grease......it works.........for
now.

Len Novak

On 4/14/2022 2:03 PM, Johnny Bridges via Gmclist wrote:

Your friendly VOM is Your Friend.  A/C at the transformer input?  If not, trace back to theA/C input and find where it stops.  A/C into the
transformer, A/C out?  If not, toast.  If so, trace the A/C output to the rectifiers, control sitcuit if any, etc.  They're fairly simple.

--johnny

--
Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that
work and labels you can see! Las Vegas, NV new email: B52srule@gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/

After playing with a VOM for a min or so....no ac power on one of the input terminals. R&R, bit of dielectric grease......it works.........for now. Len Novak On 4/14/2022 2:03 PM, Johnny Bridges via Gmclist wrote: > Your friendly VOM is Your Friend. A/C at the transformer input? If not, trace back to theA/C input and find where it stops. A/C into the > transformer, A/C out? If not, toast. If so, trace the A/C output to the rectifiers, control sitcuit if any, etc. They're fairly simple. > > --johnny -- Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that work and labels you can see! Las Vegas, NV new email: B52srule@gmail.com http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/
JB
Johnny Bridges
Sun, Apr 17, 2022 8:47 PM

Cool.  Being as it's a switcher according to someone above, no step down transformer.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs.  They must answer to me in hell

Cool. Being as it's a switcher according to someone above, no step down transformer. --johnny -- Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell