Horizontal Drive And Output Circuit Section - Kortek KTN-2001 Service Manual

KORTEK Corporation
KTN-2001/1401
PIN 2 receives a voltage of 12V line and is connected to a voltage of about 22V while
going through D202. This voltage is a terminal to amplify a voltage required in vertical
deflection and send output. It receives from fly-back generator in the section of retrace
time. PIN 3, PIN 4 and PIN 6 are pulse generators, and charge and discharge occurs
according to capacitor value set up between PIN No 3 and No 4, and resistor value set up
between PIN No 4 and No 6. OSC built-in within chip oscillates using this time, and this
pulse becomes output to PIN 1 and deflected. PIN 5 and PIN 13 is NC terminal.
PIN 7 is a terminal to control V-size and is controlled with DC level. Its surrounding
circuits are composed of R212, C207 and VR204, and are controlled according to the value
of V/R204. PIN 8 is GND terminal. PIN 9 and 10 are terminals to control V-linearity and its
circuit is as follows. It is composed of R214, V/R204, C209, C208 and R213, and R203 is a
resistor set up for limiter use whose value is set up for correction of linearity for C208
and C209. V-linearity is to be varied according to value of V/R204.
PIN 11 and 12 are composed of reversed amplifier and filter, and its circuit is composed of
C210, R215, R216, C211, R217, R218 and C212. R215 and R216 are set up for limiter use
of vertical output. R218 and C212 are circuits used for damping in order to prevent
distortion occurred upon switching of current flowing in DY coil.
PIN 14 is Vcc line and is supplied with a voltage of 12V from SMPS, and is an input
terminal to make IC 201 operate smoothly.
6-7 HORIZONTAL DRIVE & OUTPUT CIRCUIT SECTION
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