Vertical Deflection Circuit - Nokia 447ZiPlus Service Manual

21 VREF
22 V-CAP
23 V-OUT
24 E/W-OUT
25 X-RAY
26 H-OUT
27 GND
28 B+ OUT
29 Vcc
30 SCL
31 SDL
32 5V

6-8. Vertical Deflection Circuit

The power amplifier driving the vertical yoke assembly is a DC design-based on power amplifier I330
TDA8172.
The vertical deflection coil is connected to pin5 of I330 via P440. The saw-tooth signal is derived from
pin23 of I401 and fed to pin1 of I330 via R330 / C330. The DC bias voltage is derived from pin21 of I401
and fed to pin7 of I330 via derived R347 / R348 to optimize the vertical position. R335 /C336 is to
stabilize the power amplifier output.
There are two supply voltage for I330, -9V is applied at pin4 via R334, +14V DC voltage is applied at
pin2 and pin6 via D344 for the output stage during the retrace time. The supply voltage for the output
stage during the retrace time is derived from the fly-back generator output on pin3 of I330 and applied
through C343 to pin6 of I330.
Vertical Section Reference Voltage (to be filtered)
Vertical Saw-tooth Generator Capacitor
Vertical Ramp Output ( With frequency independent amplitude and S or
C Corrections if any) It is mixed with vertical position reference voltage
output and vertical moiré)
East/West Pincushion Correction Parabola Output
X-RAY Protection Input(With Internal Latch Function
Horizontal Drive Output (Collector of internal Transistor )
General Ground (reference to Vcc)
B+ PWM Regulator Output
Supply Voltage( 12V )
I2C Clock Input
I2C Data Input
Supply Voltage (5V)
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