[TechAssist] Re: Mitsubishi CS3104RA
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 26 Sep 2005 09:47:39 -0400
Actually, the original was probably a 2SD1879. Good advice to upgrade to
the 2SD1881.
Also, there was a service bulletin on the VA and VM chassis to solder a 33
ohm 1/4w resistor across the B & E of the replacement transistor.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
352-332-5668 fax
----- Original Message -----
From: "Damon" <damoneb@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, September 25, 2005 6:45 AM
Subject: [TechAssist] Re: Mitsubishi CS3104RA
Another note....2sc4927 ?? That is NOT original. A 2sd1551 is, if I remember
correctly...
That transistor's Wattage rating is 120W compared to 50W on the 2sc4927
So....slap in a 2sd1881 after you check it with a light bulb, lay your scope
probe on the iron core of the IHVT, set your scope to it's lowest or 2nd
lowest setting and horiz freq rate and fire it up....it may pop it, but the
pulse's waveshape will let you know if the IHVT is good or bad.
I ass-u-me you don't have a ringer, and don't ring IHVTs with your own
personally-built oscillator.
.
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, September 24, 2005 10:29 PM
Subject: [TechAssist] Re: Mitsubishi CS3104RA
> Of course your HOT may be damaged by a deflection short, but let's
> find out if excessive regulated B+ is the cause as I've seen in other
> sets. The B+ rises so high, it destroys the HOT instantly. Unsolder
> HOT collector leg. At the B+ INPUT to flyback, clip a standard 120
> volt 60 watt lightbulb, other lead to ground.This is a dummy load for
> the output of the reg.B+, probably should be +130V. Power set up, see
> brightness of bulb.Measure B+ at bulb.If it is at correct rated B+,
> then suspect a deflection issue like scan cap, diode ,fly,yoke,etc.
> Phil
>
> Phil Bader, Pres.
> Jan Phyl TV Inc
> Winter Haven, Fl
> (863) 299-8821
> estab. 1976
>
> ----- Original Message -----
> From: Larry Poffen <lpoffen@xxxxxxx>
> Date: Saturday, September 24, 2005 5:16 pm
> Subject: [TechAssist] Mitsubishi CS3104RA
>
> > Does anyone have any tips for a Mitsubishi Model CS3104RA that
> > blows the H/O
> > xstr when plugged in? This set is old, but it came in with the
> > H/O
> > shorted. Part is a 2SC4927, I replaced it & H/V came up for a
> > second & then
> > shorted using a variac at 100V input. Only have one more of these
> > outputs &
> > don`t see any tips for this problem. Have resoldered the driver
> > xfmr & ckd
> > caps in the area especially C539, but it is OK. Any ideas or
> > print on this
> > appreciated. Larry
> >
> > Larrys TV & Computer Service
> > Broken Arrow OK 74011
> > phone 918-455-1041
> > Fax 918-451-4485
> > e-mail lpoffen@xxxxxxx
> >
> >
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