[TechAssist] Sony, CCD-F402 camcorder, intermittent sync and video in EVF.
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: TechAssist <techassist@xxxxxxxxxxxxx>
- Date: Mon, 17 May 2004 14:48:28 -0500
Traced problem to Q172 on the VA-67 board, when good the base bias is
about 1.2 volts with good video signal, when bad the video signal is
still good but the bias on base is only about .6 (point 6) volts so
there is not much signal passing through to the emitter. Looks like the
video component is getting passed but not the sync pulses due to
improper biasing. Collector voltage stays at about 5 volts. Could
someone with a schematic tell me where the base bias comes from?
Thanks,
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
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