Panasonic KX-G8300 Service Manual And Technical Manual page 43

LO Get xii)
Vertical Dae
Booster
1C501
7)-3 Horizontal Oscillator Output Circuit
Circuit Operation:
After it is output from the signal processor, the horizontal sync signal (H-SYNC) is supplied to pin 15 of
IC501 via C532 and R558. The oscillator frequency of the horizontal oscillator circuit is stabilized by the
H-SYNC signal and feedback signal (pin 14) from the flyback transformer (FBT), and after it has been
amplified by the predrive circuit, it is output from pin 9. This signal has its polarity reversed by Q503, and
it is sent to switching transistor Q501 via Q502 and T502 buffer. The Q501 collector resonates with C509
and the FBT inductance components, and it generates pulses with a voltage of approximately 250V. Due
to these pulses, a sawtooth current flows to the deflection coil, and a horizontal deflection magnetic field
is generated.
The Q501 collector signal is sent to the FBT (flyback transformer) and it generates the 90V, 500V and
12kV voltages. The 9O0V line is used as the power supply for generating the signals which are supplied to
the cathode, and the voltage is divided down by R452, R453 and R544 and sent to the first grid of the
CRT. The 500V line is supplied to the second grid and further divided down by R520 and R531, after
which it is supplied to the third grid as the focus control voltage.
t2KV
C529 R537
+
C530
I
deflection amplifier Cae aes
Fig. 42