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Would you share that MS-215 circuit diagram??Well, turns out I already have the diagram for the MS-215, which should
be substantially similar to the MS-230. It was tucked away in files I
hadn't looked at in 15 years! So, guess I'm good to go.
Michael
Over here they're 'wrenches', but probably more than the $900 hammers theWhat was the price for NASA spanners ?
Nadir:
Sounds to me like basic power supply B+ regulation has failed..... bad
regulator chip, high esr electrolytics, shorted diodes, etc...... a
common
high failure part is the STK regulator but the other parts of the
circuit
must be tested. Put a meter on the regulated B+ rail and then vary
the AC
input voltage with a variac +/- 10 volts to see if the B+ holds
steady.
If the problem is not there, then look for faulty screen filtering caps
....
usually low up/high voltage units near and around the flyback......
i.e.
22@250, etc.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------------------------
"Nadir" zen_nadir@hotmail.com wrote in message
news:4dde1835.0309152229.55604df3@posting.google.com...-
I am currently working on an RCA 27" model F27634ET, chassis
CTC187BJ.
The original problem was the set would squeal when plugged in and
wouldn't power on. Q401 was shorted B-E, I don't have a BUH517 on
hand so I subbed with a BU2520DF. C4709 was also replaced and I
resoldered the flyback, STK regulator, H-Out transformer and pretty
much most of the deflection/PS section of the board. The set now
runs
and the HOT is warm to the touch but well below maximum temperature.
However the picutre changes size dramatically with any change in
brightness. If I turn the brightness down low the picture will
shrink
down by about 20% on all sides and there is some pincushion
distortion. I suspected it may be the usual tuner solder problem but
if i bring up a static picture and firmly tap the tuner the picture
doesn't flinch. Pincushion problems are usually related to Q851,
D851, C4803, C4402, C4403, CR4402, C4407 and CR4403 but here they all
test OK. I suspect it may be the STK regulator module failing but I
want to be sure before replacing it. Any help is appreciated.
Thanks.-
It could be as simple as a bad connection - or almost anything else.I have a Samsung mw6470w microwave the problem with it is that it has
stopped to heat.
One morning when operated it was doing everything but just not heating
the things.
Its working normally, all its functions are normal but its not just
heating.
it has worked very well all these years. No problem at all.....is it
all over for it now?
Will it be cheaper to buy a new one....Will it worth repairing what is
actually wrong with it?
I live in Surrey Canada.
And it tastes terrible.My .02. The high cost of replacement printer cartridges; compared to
initial
cost of a printer. Does not compute!
Ink jet ink costs much more per ml than the finest vintage wine.
N
Some people buy cartridges on eBay from those 'pallet resellers'. TheyMy .02. The high cost of replacement printer cartridges; compared to
initial
cost of a printer. Does not compute!
Ink jet ink costs much more per ml than the finest vintage wine.
N
And it tastes terrible.
It's all a conspiracy by the landfill operators.
Thanks, but it has non-standard power connectors for the front panel, andYou don't have to buy an original these N+1 PSU's are available here's a
link to the ZIPPY EMAC site
http://www.zippy.com/P_INDEX.asp?lv_rfnbr=2
Alvin,has problem with vertical green lines, need the repair manual
has problem with vertical green lines, need the repair manual
Alvin,
The .pdf is on http://staff.washington.edu/rrcc/uwweb/MT-1040
It's an 8 Meg file, so make sure your system can handle it. This is
the fourth inquiry I've seen in the past two weeks for that projo.
Did someone surplus a bunch of them? ;-)
Ray
--
My return addy is spamblocked. To reply, remove the zeroes.
Any luck on this? I've got one also and would like to use it. It's new but
I don't even have a power cord for the small 10-pin socket. Anyone know
connections for that?
I took a look. Sample quote:http://www.want-to-be-sure.blogspot.com << Click On Link
Not until you learn how to set your computer clock.Any info is of course greatly appreciated.
I saw problems like this in fixed frequency 19"/20" RGB Sony monitorsHi;
I'd almost bet this is another dried-up electrolytic, I just can't seem
to find it! The perpetrator is an HP 98751a, aka Sony GDM-1952, (aka
Rasterops 19, Supermac etc), and it is a 5-BNC RGB fixed-frequency
monitor that does 1024x768 INTERLACED only. Given that, it has been a
great display anyway and I'd hate to throw it out.
Problem started a few weeks ago at turn-on. The screen seemed to be
traced fully and normally by one field, while the other scrunched up
away from the bottom-- so that I had two mouse-pointers spaced about an
inch apart ...
I saw problems like this in fixed frequency 19"/20" RGB Sony monitors
attached to IBM 5080/5085 CADCAM
workstations. The problem was dried
out caps on a little daughter PCB hanging off the middle of one of the
main PCBs. Sorry, I can't be any more specific than that.
BTW, when
was your monitor manufactured?
I think so.I saw problems like this in fixed frequency 19"/20" RGB Sony monitors
attached to IBM 5080/5085 CADCAM
workstations. The problem was dried
out caps on a little daughter PCB hanging off the middle of one of the
main PCBs. Sorry, I can't be any more specific than that.
BTW, when
was your monitor manufactured?
Feb 1990. I would imagine your IBM workstations were probably in the
same timeframe-- we may be talking about the same chassis.
The size sounds right. IIRC, the PCB had a few aluminium electrolyticsThere are several "daughterboards" on this mainboard. They are all
soldered on heavy wires-- for robustness I suppose. You said in the
middle-- that does narrow it down and I think I could get to that one's
caps without having to unsolder the whole board-- well maybe not!!
That board, about 3x3.5", is likely to be what the schematics show as
Board "Dc", subtitled "T/B correction". That makes sense, doesn't it?
I think I'll see if I can pull that board without destroying anything--
thanks much, Franc, for the tip!!
I desoldered the PCB to gain access to the caps. I can't remember ifOn 19 Mar 2005 20:48:23 -0800, "Glynn R." <grharris@worldlogon.com
put finger to keyboard and composed:
There are several "daughterboards" on this mainboard. They are all
soldered on heavy wires-- for robustness I suppose. You said in the
middle-- that does narrow it down and I think I could get to that one's
caps without having to unsolder the whole board-- well maybe not!!
Organization: BellSouth Internet ServiceI apologize. It isn't your computer clock that is wrong, it is your
incompetent ISP's NNTP server clock.