Toshiba 2857DD - Test Signal Selection

TEST SIGNAL SELECTION
Every pressing of -@) button changes the test patterns on screen as described below in SERVICE MODE.
Signal off —> NTSC signals (14 patterns)
PAL signals (14 patterns)
* About inside signal: The inside signal is output at video input terminal from QA01, and is not output with the pin
inserted into terminal. (Single color signal can be output.)
Signals Using method
Purity and White uniformity of CRT
* Red single color Red single color. . . . Stopping G and B output of Q501
* Green single color Green single color. . . . Stopping R and B output of Q501
* Blue single color Blue single color. . . . Stopping R and G output of Q501
* Black single color Black single color. . . . Making black signal of approx. 1Vp-p in QA01
* White single color White single color. . . . Making white signal of approx. 1Vp-p in QA01
* W/B adjustment White balance adjustment
White part. . . . White balance adjustment/check in light area
Black part. . .. White balance adjustment/check in dark area
>< Making approx. 1Vp-p signal in QA01.
* Black cross-bar Picture position (horizontal, vertical and slant) in CRT adjustment
* White cross-bar >< Making approx. 1Vp-p signal in QA01.
* Black cross-hatch Convergence and vertical amplitude adjustment
* White cross-hatch 3X Making approx. 1Vp-p signal in QA01.
* Black cross-dot Convergence adjustment
* White cross-dot a 3X Making approx. 1Vp-p signal in QA01.
* H signal For checking (of purity drift) of white uniformity of CRT
(Left, right, white) H signal (Left, right, white). . . . Check in light area
° H signal H signal (Left, right, black). . . . Check in dark area
(Left, right, black) The adjustment will be the best, if the time when unevenness of color in light
area occurs, is a little longer than that in dark area.
%% Making approx. 1Vp-p signal in QA01.