Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-09-25
1982-02-16
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 962
Patent
active
043162126
ABSTRACT:
A method and associated apparatus are disclosed for facilitating the service adjustment of the blanking current levels of a kinescope in a color television receiver, when video signals are decoupled from the kinescope and kinescope vertical scanning is disabled in a service operating mode of the receiver. In the service mode, a grid electrode of the kinescope is forward biased during a monitoring interval to produce a kinescope cathode output voltage proportional to the kinescope blanking current level. A sample of the cathode output voltage is compared with reference voltages for providing plural output signals representative of high, low and correct cathode blanking current levels relative to a desired current level. The output signals energize plural display devices for indicating whether the blanking current is high, low, or correct with respect to the desired current level. If necessary, the kinescope bias is adjusted until the display devices indicate that the desired blanking current level is obtained.
REFERENCES:
patent: 4118729 (1978-10-01), Shanley
Kurdyla Ronald H.
Murray Richard
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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