Ikegami HTM-1990R Service Manual page 29

<VIDEO System (APT Circuit)>
(a) VR701 [EDGE BAL]
For TP701 (EDGE), Input the 2T pulse signal and Adjust edge level to same level.
(b) VR702 [EDGE NULL]
For TP701 (EDGE), Adjust the leak to zero of the DC section (example: level sections such as color bar
signal, etc.) of the Y signal.
(c) TP106 [Y-1]
Turn the APT switch on the Front Panel to ON and confirm that the edge signal is superimposed. Also
change the preset data and confirm that the level changes.
Note: The boost frequency is different for HDTV and SDTV when the analog component is input.
• HDTV : Approx. 16.6MHz
• SDTV : Approx. 4MHz
(d) VR752: BF LMIT
<SYNC System>
(a) TP905 [CLK1]
TP906 [CLK2]
The clock frequency is about 13.5 MHz.
(b) TP871 [G1]
The following signals are output.
BIAS.P
0V
V.BLK H.BLK
1-B-18
H rate
Adjust
Approx. 12V 0 -p
Approx. 12V 0 -p
Set DC element
to zero
V rate