[Tig] DAV deflection
George.Zerial at nfsa.gov.au
Wed Feb 10 21:28:09 GMT 2010
well, what an overwhelming response Ive had.
Thankyou to all who replied and in particular to Nathan Gleit for his
correction to the correct component (R20) and the picture of the resistor
in question. ( 7.5K)
The manuals I have for the DAV system extend as far as the main circuit
boards. I have to assume as the external power supplies are generic,
there is no information available for them.
Well in my case anyways...... and as far as the local distributor is
While I have your interest in this area, what brought me here in the first
place is a "fault" that has been plaguing me on and off now for some time.
I didnt want to send out an email to the TIG until I had more information
......... but here I am.
After things have "warmed up" and intermittently, the intesity of the tube
gets modulated. The net effect is the picture "bouncing" on the waveform
Wanting to dismiss the tube for obviou$ reasons, I have been probing
around the area of the grid control ( 200V supplied by the external Power
As luck would have it and the position in which one has to get in to
access the area ( Wii Fit take note...) with a cro probe is not conducive
to a happy ending.
Fortunately it was only a 5cent resistor.
So Im trying to gather information. Trying to get a grip on something
thats going to give me a clue as to why this "modulation" is happening.
Anyone got any ideas ??
If nothing else, its a comforting thing knowing there is a global
connection to people with similar situations and setups.
National Film & Sound Archive
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