[TechAssist] Re: HELP- MAG. PN3046 A104 PTV420-A104 dead
- From: "DEVROUGH GROUP" <TechDept@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 2 Jan 2002 20:15:09 -0500
BOB, going by memory, unexplained Q401 shorted on the power supply was often
caused by T401 Switching Trans.
Confirm R407, R408, R466, .12 ohms 1 watt and D402.
I assume all the secondary voltages produced by T401, power supply board
missing.
Signal Deflection Panel; confirm that Q906 horizontal output is not shorted.
Confirm R934 emitter resistor is .33 ohns 1/2 watt.
Bad, cracked projection tube (B) common problem.
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of bob
Sent: Thursday, January 01, 1998 1:33 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: HELP- MAG. PN3046 A104 PTV420-A104 dead
Hi marty
I really appreciate the scans you know you stuff, r416 22ohm was bad read
68 ohms changed it that stablize d429 ac led,hit power no B+ though i cant
get a drive from ic401.should t401 have any secondary when d430 is off?i
have at ic402 pin 16 4.9v,well you have help enough, i get back on it
a.m........thank you....bob
HAVE A GREAT DAY!
ELECTRON WORLD
GUTHRIE KY
----- Original Message -----
From: DEVROUGH GROUP <TechDept@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 31, 2001 8:10 PM
Subject: [TechAssist] Re: HELP- MAG. PN3046 A104 PTV420-A104 dead
>
> Bob, I forgot, did you check R416 22ohms 1/3 watt
> Other on way
>
> Marty
> Marty@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of bob
> Sent: Monday, December 31, 2001 8:40 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: HELP- MAG. PN3046 A104 PTV420-A104 dead
>
>
> Thanks marty for the info. d429 is very dim have to cover it up really
> dim,hor-out checks ok,standby missing?Can you scan the p.s.if possiable
for
> me when you can ,ilove to get this dog out of my whay.lol........I will
pay
> you for it....thanks again.....bob
> Have a great day! ( HAPPY NEW YEAR TO ALL!)
>
> ELECTRON WORLD
> GUTHRIE KY
> ----- Original Message -----
> From: DEVROUGH GROUP <TechDept@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, December 31, 2001 6:17 PM
> Subject: [TechAssist] Re: HELP- MAG. PN3046 A104 PTV420-A104 dead
>
>
> >
> > BOB, Diagnostic LEDs of the power supply.
> >
> > D429 located on the front edge of the module
> > ON: Normal (light whenever AC is applied)
> > BLINKING: Problem with the 15vdc standby supply.
> >
> > D430 located at the top of the module
> > ON: Normal (light up at power on command)
> > OFF: No 130vdc supply is present
> >
> > Check horiz output and emitter resistor also shorted CRT (B)
> >
> > If you need more info I have manual, just ask.
> >
> > Marty
> > Marty@xxxxxxxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of bob
> > Sent: Thursday, January 01, 1998 2:33 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] HELP- MAG. PN3046 A104 PTV420-A104 dead
> >
> >
> > Hey guys
> > Anyone have any data/tips on this one or a scan of p.s. would be great
> MAG.
> > ptv-420-ah01,found shorted reg.Q401 change it and the reg.controler
ic.401
> > and d419.Chopper still not switching ,There two small LEDs on the p.s.
> board
> > what are the for (statis) ? thay are off .any help would be
> > appreciated.............bob
> >
> > HAVEA GREAT DAY!
> >
> > ELECTRON WORLD
> > GUTHRIE KY
> > ------------------------------------------
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