[TechAssist] Re: [Fwd: update.Re: NEC P7701 Multisync 70 relay may chatter at turn on,no display.]
- From: "Ray Lufkin" <Rlufkin@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 17 Nov 2001 06:34:37 -0500
Phil I think you have a problem in your smps. Is the hv regulating (check by
bouncing your white/black window)I suspect something in the smps feedback
loop.....cap maybe.
----- Original Message -----
From: "Phil Bader" <philbad@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 16, 2001 5:39 PM
Subject: [TechAssist] [Fwd: update.Re: NEC P7701 Multisync 70 relay may
chatter at turn on,no display.]
>
>
>
> -------- Original Message --------
> Subject: update.Re: NEC P7701 Multisync 70 relay may chatter at turn
> on,no display.
> Date: Fri, 16 Nov 2001 17:16:44 -0500
> From: Phil Bader <philbad@xxxxxxxxxx>
> Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
> To: Electronic Hardware Repair <ELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
> References: <3BF19BB7.ADB2C584@xxxxxxxxxx>
>
> After much testing,Iunplugged CRT socket.Behold!Unit clicked once,HV
> came up and stayed.I replaced the rectifier and cap in this 6 volt line,
> D113, C122 (1000mfd). No help. I replugged CRT board back into CRT and
> unsoldered the actual CRT filiment pin (high side, +6V) and monitor will
> stay up and run.If, while it is on I jumper the fil pin, CRT will show
> good display.So, just unsoldering the CRT fil. pin does the trick.I
> ohmed the CRT fil. pins, no dead shorts,Fil volts no load at 8VDC, with
> load, 6VDC. I am stumped. It's like the CRT is loading this source and
> shutting down the SMPS. Ideas???
>
> Phil Bader wrote:
> >
> > Customer said it would "click,click,click".Sometimes it comes up with
> > good display here in shop. Other times, push power,hear relay clicking
> > erratically, or so rapidly,may almost vibrate.No HV, no display.-TIA,
> > Phil
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