TECH : Electrohome G07

[P-Man]

[ukvac] TECH : Electrohome G07
hi all..

ok, got an electrohome G07 here, was turning itself off after 4-5 mins.. I
put a cap kit on it recently to see if that would help.

Well, it made it worse, but there's a reason why

basically the HV is being shutdown by the xray protection circuit because
the B+ is way too high. After installing the cap kit it immediately fired up
then switched off not even as good as before well, there was a cap of the
wrong value installed next to the lopt, this was allowing the xray
protection circuit to kick in a bit later, so replaced with the correct
value it shuts down immediately.

I wondered why, until i measured the B+ which was at 177v instead of the
expected 120v hmm turned the pot to turn it down, absolutely no effect
whatsoever.

I removed X701 which disabled the xray protection circuit and the monitor
works, but of course, i don't want to sterilise the visitors at the
exhibition so i popped the tranny back in.

I can only assume its a regulator failure, however on checking all the 9xx
componnets i couldn't see a prob.

i'm stumped, the only thing i think i could do is to replace all the
silicon, but i'd like an easier solution than that

any ideas anyone?

Andy

 

[pobtastic]

RE: [ukvac] TECH : Electrohome G07
Capacitor C511??? Or even maybe X501, and it is a horizontal deflection
failure. Apparently (!) inspect the chassis for bad solder joints
(especially around the high voltage unit) and for hairline cracks in the
PCB. Also, measure the voltage at the metal case of X01, maybe IC501...

Of course NONE of this is anything I know anything about... Just being
helpful...

Pobster

 

[P-Man]

Re: [ukvac] TECH : Electrohome G07
> Capacitor C511??? Or even maybe X501, and it is a horizontal deflection
> failure. Apparently (!) inspect the chassis for bad solder joints
> (especially around the high voltage unit) and for hairline cracks in the
> PCB. Also, measure the voltage at the metal case of X01, maybe IC501...
>
> Of course NONE of this is anything I know anything about... Just being
> helpful...
>
> Pobster

heheh

i think you've been reading randy fromm's flowchart, but not exactly paying
attention

C511 was of the wrong value, i replaced it with the correct value. This
merely shuts the monitor down quicker, which is a good thing. Using a
different value will distort the usefulness of the OVP.

I do not have horizontal deflection faliure otherwise the monitor would not
work when i disabled the OVP circuit

food for thoguht...

Andy

 

[pobtastic]

RE: [ukvac] TECH : Electrohome G07
Exactly right!!! ) Well, was just trying overly hard to be helpful!!!

Pobster

 

[JCRS]

Re: [ukvac] TECH : Electrohome G07
Speaking of G07's... Does anyone have one they wish to sell to help me
complete my Centipede restoration.

I currently have a Hanterex in it.. which I wish to change. Im not to fussed
if you have a G07 with loads of screen burn as I do have a ideal tube to
replace with it.

A complete web based centipede restoration page coming soon..

 

[Alpha1]

Re: [ukvac] TECH : Electrohome G07
He is Paul , he is!!!

> Are you crazy?
>
> Jon Pinckney wrote:
> >
> > Speaking of G07's... Does anyone have one they wish to sell to help me
> > complete my Centipede restoration.
> >
> > I currently have a Hanterex in it.. which I wish to change. Im not to
fussed
> > if you have a G07 with loads of screen burn as I do have a ideal tube to
> > replace with it.
> >
>

 

[PaulSwan]

Re: [ukvac] TECH : Electrohome G07
Are you crazy?

Jon Pinckney wrote:
>
> Speaking of G07's... Does anyone have one they wish to sell to help me
> complete my Centipede restoration.
>
> I currently have a Hanterex in it.. which I wish to change. Im not to fussed
> if you have a G07 with loads of screen burn as I do have a ideal tube to
> replace with it.
>

 

[JCRS]

Re: [ukvac] TECH : Electrohome G07
Crazy????

Well I thought I should be going for originality..

I take it G07 are pants then?

Ive always rated Hanterex as ok.. but the Hanterex fitted had some serious
Defender/Stargate screen burn.

 

[P-Man]

Re: [ukvac] TECH : Electrohome G07
G07's rock.

sometimes quite badly

nah, i like G07's they're pretty basic and easy to fix.. except when you get
a weird problem like the one i have right now.. but let's not dwell on
that...

adny