[TechAssist] Re: 1990 20" Mits/Electrohome, HUM ?
- From: Edward Gaidies <teltek@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 12 Feb 2002 17:59:51 -0500
Keith;
Send this e-mail to me in the morning, I'll pull the schematic and have a
look at it. Not in the shop right now.
-Ed-
teltek@xxxxxxxxxxxx
>
> Thanks Ed. The B+ is 130 v clean, b+ to video outs is clean(scoped) tried
> IC201 & IC701 (video jungle) main filter, filtering before and after
> regulator. Hum can be seen in video on collector of crt video drivers. I
> don't have a schematic ! What and where supplies VCC to video jungle IC ?
> Thanks
>
> Keith Trumbla
> O/O B.E.M Electronics Est.1954
> 839 Ellice ave.
> Winnipeg Manitoba, Canada R3G 0C3
> Ph.(204)775-2875 Fax(204) 774-9192
> Mail to : ktrumbla@xxxxxxxxxxx
>
>
>> From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
>> Reply-To: techassist@xxxxxxxxxxxxx
>> To: <techassist@xxxxxxxxxxxxx>
>> Subject: [TechAssist] Re: 1990 20" Mits/Electrohome, HUM ?
>> Date: Tue, 12 Feb 2002 16:57:14 -0500
>>
>>
>> To start with 50CJ11 is the same as a Mitsubishi CS-2047R. (VL-B-C47R)
>> By your description, check how many volts you have on the collector of your
>> kine drive transistors (3), should be approx 185V, if the voltage is low,
>> replace C515...10ufd/250volts, 200 volt supply to drive transistors.
>> Floating hum bar may also be caused by IC201, (TA8680N) Part# 272P46101.
>>
>> -Ed-
>> teltek@xxxxxxxxxxx
>> TEL-TEK ELECTRONICS.
>>
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Keith Trumbla" <ktrumbla@xxxxxxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Sent: Tuesday, February 12, 2002 9:40 PM
>> Subject: [TechAssist] Re: 1990 20" Mits/Electrohome, HUM ?
>>
>>
>>>
>>> Thanks Ed, The pix is not actually bending like bad hum, the ripple is
>>> rolling thru the picture. But the ripple is pretty much the size of the
>>> whole screen as it waves thru, make sense ? Now I'm confused ;)
>>>
>>> Keith Trumbla
>>> O/O B.E.M Electronics Est.1954
>>> 839 Ellice ave.
>>> Winnipeg Manitoba, Canada R3G 0C3
>>> Ph.(204)775-2875 Fax(204) 774-9192
>>> Mail to : ktrumbla@xxxxxxxxxxx
>>>
>>>
>>>> From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
>>>> Reply-To: techassist@xxxxxxxxxxxxx
>>>> To: <techassist@xxxxxxxxxxxxx>
>>>> Subject: [TechAssist] Re: 1990 20" Mits/Electrohome, HUM ?
>>>> Date: Tue, 12 Feb 2002 15:29:30 -0500
>>>>
>>>>
>>>> Keith;
>>>> Is the actual picture bending?
>>>> Or is it just a pattern that rolls thru the picture.
>>>> For starters, try unplugging the degaussing plug.
>>>> Then check main filter and input diodes (leaky).
>>>>
>>>> -Ed-
>>>> teltek@xxxxxxxxxxx
>>>> TEL-TEK ELECTRONICS.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Keith Trumbla" <ktrumbla@xxxxxxxxxxx>
>>>> To: <techassist@xxxxxxxxxxxxx>
>>>> Sent: Tuesday, February 12, 2002 7:57 PM
>>>> Subject: [TechAssist] 1990 20" Mits/Electrohome, HUM ?
>>>>
>>>>
>>>>>
>>>>> I have a 1990 Mits/Electrohome model 50CJ11 Chassis # VL-B-C47R. The
>> set
>>>> has
>>>>> a rolling flicker or wide hum bar rolling thru the pix. Almost like
>> when
>>>>> your color phase is out by a little. Any ideas ?
>>>>>
>>>>>
>>>>>
>>>>> Keith Trumbla
>>>>> O/O B.E.M Electronics Est.1954
>>>>> 839 Ellice ave.
>>>>> Winnipeg Manitoba, Canada R3G 0C3
>>>>> Ph.(204)775-2875 Fax(204) 774-9192
>>>>> Mail to : ktrumbla@xxxxxxxxxxx
>>>>>
>>>>>
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--
From: Ed Gaidies
teltek@xxxxxxxxxxx
Tel-Tek Electronics
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