NEC MultiSync FP1370 Service Manual page 148

c. Fh Band
fHV
fH1
fH2
fH3
fH4
fH5
fH6
fH7
41.5kHz
33.6kHz
30.8kHz
36.6kHz
Attention: fH1 to 7 Band signals are output for horizontal output circuit control to keep the horizontal
linearity constant.
d. Degaussing Control
Manual degaussing signal. IC801 pin 53 becomes High for 3 seconds when user presses the
"PROCEED" switch while "DEGAUSS" (MENU(u) - "BRIGHTNESS & CONTRAST") or "GLOBALSYNC"
(MENU(u) - "TOOL2") is highlighted, the monitor is powered on.
DAC - "ROTATE","GLOBALSYNC" , and "CONVERGENCE" data value is set to center, while
degaussing. This pin will be LOW in normal condition.
65.5KH
49kHz
57kHz
45.8kHz 52.7kHz
(Fig. 6.1) Output fh Band status (IC571)
8-23
111kHz
82.6kH
69.5kH 101kHz
121kHz 130kHz