Rgb Out Board - Ikegami HTM-1517R Service Manual

RGB OUT BOARD
(1) Circuit Structure
(a) Voltage amplifying Circuit
(b) Current amplifying Circuit+BFS (Beam Feedback System) switch Circuit
(c) BFS (Beam Feedback System) sampling-hold Circuit
(d) Ripple Filter
(2) Adjustment Method
* When not otherwise indicated, HDTV is the standard for the input signal in the analog component of YPbPr.
* The figures are images are differ from the actual signals.
(a) VR101 [R FREQ.COMP]
VR201 [G FREQ.COMP]
VR301 [B FREQ.COMP]
Input the sweep signal to Y and flatten the difference in the levels of the encircled sections from low level
to medium level in the test points TP1 (R), TP2 (G), TP3 (B) of the CRT SOCKET BOARD.
Finally, adjust the Frequency Characteristic within +1dB/-3dB up to 25 MHz.
Note: Use the 100:1 high voltage/low capacity probe.
Standard
60Hz
Standard
60Hz
-3dB +1dB
25MHz 30MHz
-3dB +1dB
25MHz 30MHz
Standard
60Hz
-3dB +1dB
25MHz 30MHz
1-B-22