13
X-ray Protection
The X-ray protection input pin25 provides a voltage detector with a precise threshold. If the voltage
exceeds this threshold for a certain time, an internal latch switches the whole IC into protection mode.
In this mode several pins are forced into defined states:
Pin28 (BDRV) is floating
Pin26 (HDRV) is floating
Vertical Oscillator
The vertical free –running frequency is determined by the capacitance C613 at pin22. Usually the free-
running frequency should be lower than the minimum trigger frequency.
5-3 TRANSISTOR & DIODE CIRCUIT
LOCATION
CIRCUIT FUNCTION DESCRIPTION
D901~D904 Rectifier Diode for AC Source
D910 Clamp Diode for snub CKT
D919 Rectifier for Output Voltage
D922 Rectifier for Output Voltage
D923 Rectifier for Output Voltage
D925 Rectifier for B+ Supply
D929 B+ Feed Back Rectifier from F.B.T Pulse
IC901 Power IC for Switching Power Control (Build-in MOS FET)
Q907, Q908 Use for Power Saving to Cut-off 6.3V Supply Voltage
Q909, Q910 Use for Power Saving to Cut-off 14V Supply Voltage
Q912, Q920 Push-Pull Topology to Drive Q911
Q913 Degaussing Switcher Transistor
Q906 5V Regulator Transistor
Q402 HOR. Driver Transistor
Q440 Horizontal s correction control MOSFET(Four in one)
Q404, Q405 As Differential Amp. to Drive Q406
Q406 Transistor for H-Size Control
Q705 Brightness Control CKT
Q742 V-Dynamic focus CKT
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