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2.1.7 H-center CKT
The current flow through the deflection yoke is sawtooth waveform. We can make raster shift left or right
by changing the DC level of the sawtooth waveform. Adjusting the TP4 or TP5 , the voltage across the
D307 or D308 will be changed. So the DC level and H-center will be changed.
2.1.8 HV Shutdown Circuit
The IC201 pin2 (XRAY) provides a voltage detector with a threshold. If the voltage at pin XRAY exceeds
this threshold (6.25v typical) the pins HDRV, BDRV, VOUT1 and VOUT2 are floating. When anode
voltage increases, the voltage at FBT (pin3) increases. the voltage at IC201 pin2 increases.
shutdown voltage is about 28KV.
2.1.9 Horizontal linearity CKT
7277e Cs control truth table
Frequency range
Fh 36K
36KFh40K
40KFh50K
50KFh62K
62KFh72K
Circuit Operation Theory
TP4
1
TP7
TP6
HDY
2
TP5
Fig 7 H-Center circuit
IC201
TDA4854
Fig 8 HV- shutdown CKT
SC2
SC1
0
0
1
0
1
0
0
1
1
1
Fig 9 Linear circuit
API Confidential
No Copy/Reproduction Allowed
D307
RGP10D
R310
22
2W
D308
19.40130.021
RGP10D
C204
R216
+
1U
16K
50V
(1%)
(EL)
SC0
Cs Capacitor
0
C313 +C311+C314+C312
0
C313+C314+C312
1
C313 +C314
1
C313+C311
1
C313
DYH+
L303
20mH
TP3
TP2
+48V
R217
R218
100K
20K
(1%)
(1%)
The
2-5
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