Caple C702G Manuel de service télécharger pdf (Page 139)

8-14

+5V

IC532

15pin

The H SIZE MAX has two area of memory (H SIZE MAX 1 and 2) which is selected by the below table.

H Frequency Range[kHz] Selected Memory

121.0

–

130.0 H SIZE MAX 2

111.0

–

121.0 H SIZE MAX 2

101.0 - 111.0 H SIZE MAX 2

82.6 - 101.0 H SIZE MAX 2

69.5 - 82.6 H SIZE MAX 2

52.7 - 69.5 H SIZE MAX 2

49.0 - 52.7 H SIZE MAX 1

41.5 - 49.0 H SIZE MAX 1

36.6 - 41.5 H SIZE MAX 1

33.6 - 36.6 H SIZE MAX 1

30.8 - 33.6 H SIZE MAX 2

6) Rotation Correction Circuit

Raster rotation is corrected by moving the electron beam in the magnetic field produced by current applied

to the Z-coil. The amount of correction is proportional to the current applied to the Z-coil and the correction

can be adjusted with the control voltage (DC) of the D/A converter. The DC voltage output from IC532(D/A

converter) pin 15 generates current to flow in the Z coil, and amount of rotation is determined. User can

adjust the level of rotation by operating OSM menu (Rotate). The level of rotation is controlled by detective

amplifier (IC4J1), and output the current to Z coil by push-pull buffer. (Q4K1, Q4K2)

(Fig. 2.10) Rotation Correction Circuit

7) H Centering Circuit

Switching regulator generates the floating 5.5 volts which is compared to the deflection circuit power

supply voltage ( high B+ voltage). This voltage is divided by VR581 (H centering) and is supplied to the

base of Q581. The voltage differences of Q581's base and emitters is supplied to L562.

Horizontal centering is manipulated by the current supplied by L562 to the horizontal deflection circuit.

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Caple C702G Manuel de service Page 139