[ICOM] IC775DSP display backlight problem

[AD5VJ Bob]

Not being able to see it I can not say for sure. But it is possible yes.

  73 fer nw,
Bob AD5VJ(AAR6VM)
Visit My Ham Blog
http://www.ad5vj.com/

10X# 37210, SMIRK#-5177, RARS #-149
Code may be taking a back seat for now,
but the pioneering spirit that put the code
there in the first place is out front of it all.


 

> -----Original Message-----
> From: icom-bounces at mailman.qth.net 
> [mailto:icom-bounces at mailman.qth.net] On Behalf Of Juan Pablo 
> Mercé LU4DX
> Sent: Saturday, June 17, 2006 8:25 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] IC775DSP display backlight problem
> 
> Hi Bob !
> 
> Yes, I try to fit with the control that you say in the left 
> side under the top cover but I do not work.
> I not with which speed changes, probably I made it very rapid 
> and had not time in order that it fits?
> There can be something damaged in the part that controls the 
> low intensity of the display?
> 
> 73's Paul LU4DX
> 
> ----- Original Message -----
> From: "AD5VJ Bob" <rtnmi at sbcglobal.net>
> To: "'ICOM Reflector'" <icom at mailman.qth.net>
> Sent: Saturday, June 17, 2006 10:04 PM
> Subject: RE: [ICOM] IC775DSP display backlight problem
> 
> 
> There is an adjustment on the inside cover on the left side 
> of the rig.
> 
> The adjustment is for the low setting and it is probably set too high.
> 
> BE SURE ANC CHECK THE MANUAL FOR INSTRUCTIONS ON HOW TO ADJUST IT.
> 
>   73 fer nw,
> Bob AD5VJ(AAR6VM)
> Visit My Ham Blog
> http://www.ad5vj.com/
> 
> 10X# 37210, SMIRK#-5177, RARS #-149
> Code may be taking a back seat for now,
> but the pioneering spirit that put the code
> there in the first place is out front of it all.
> 
> 
> 
> 
> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net
> > [mailto:icom-bounces at mailman.qth.net] On Behalf Of Juan Pablo
> > Mercé LU4DX
> > Sent: Saturday, June 17, 2006 7:40 PM
> > To: ICOM Reflector
> > Subject: Re: [ICOM] IC775DSP display backlight problem
> >
> > I have a problem related to the display in my IC-775DSP.
> > This one works well and without intermittences but I cannot
> > change the intensity of the display, try to change the value
> > to LO and HI into the menu but nothing happens like the
> > preset to change the low intensity.
> > The level seems to be in the high position.
> > The previous owner said to me that the display backlight was
> > intermittent and he resoldered the lamp's power transformer
> > secondary contacts to the printed circuit board.
> > Does someone know where the problem can be not to be able to
> > change the intensity of the display?
> >
> > Tnx in advance,
> >
> > Paul LU4DX
> >
> > ----- Original Message -----
> > From: "Martin Sole" <msole at loxinfo.co.th>
> > To: <icom at mailman.qth.net>
> > Sent: Saturday, June 17, 2006 5:12 AM
> > Subject: [ICOM] IC775DSP display backlight problem
> >
> >
> > > Dear Icom friends,
> > >
> > > I have a problem with an IC775DSP display that I would
> > appreciate some
> > > assistance with. The owner noticed the backlight flicker a
> > couple of times
> > > then go out. This was accompanied by a burning smell and
> > some smoke.
> > > Investigation shows that both Q17 & Q18 in the backlight
> > driver circuit
> > > have disintegrated.
> > >
> > > I would first like to know what kind of voltage the
> > backlight is meant to
> > > be driven with? The schematic shows it to be simply an LED
> > driven from a
> > > rather complicated AC source. I therefore assume that the
> > backlight needs
> > > more than just a few volts at a few mA.
> > >
> > > My second question concerns the voltage source itself. This
> > appears to be
> > > some sort of oscillator driven from the 14 volt line but I
> > am unfamiliar
> > > with the nature of its design. I did replace the damaged
> > transistors with
> > > similar items albeit 100 volt rated rather than 120 volt
> > rated but they
> > > immediately self destructed so I assume I need to look
> > elsewhere for the
> > > cause.
> > >
> > >
> > > I can email scans of the circuit area if anybody would like
> > to see before
> > > passing comment.
> > >
> > > Thanks in advance for any help.
> > >
> > > Martin HS0ZED
> > > ----
> > > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> > >
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
> 
> 
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>