Specifications

Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 89ES1E 9.
9.2.1 Basic Description.
T0 - T1
Figure 9-2 Deflection T0 - T1
At switch on of the TV set Scap (2417/2418) is charged by
Vbatt. At T0 line transistor 7405 starts conducting. Now the
current flows as shown in figure (T0 - T1), as a result of which
the horizontal deflection will bend the electron beam from the
centre of the screen to the right. Note that the deflection current
has an almost linear waveform.
T1 - T2
Figure 9-3 Deflection T1 - T2
At T1 line transistor 7405 is switched off and the line fly-back
starts. When the line transistor stops conducting, the line
current is at its maximum level. The current charges fly-back
capacitors 2412 and 2413, and also capacitor 2414. This
causes a decrease of line current. (Note that this current has a
half-cosine waveform). The deflection position (i.e. the electron
beam) is in the middle of the screen now.
NC
7
9
5455
1
2
4
5
DEFLECTION
HORIZONTAL
COIL
1
2
5409
2
1
1
2
3
4
C948
5406
*
9412
GND_HOR
2417
2
1
5408
2419
3473
5409
3
4
3
4
5408
K
0V
140V
A
0V
*
*
J
7405
BU2520DX
2413
F418
6404
DMV1500M
3416
47R
2414
2n2
GND_HOR
2412
I473
F419
2416
Vbatt
Deflection T0-T1
27V
D
G
S
0V
4V8
E/W
2K2
3434
6471
I499
7406
I415
82K
3425
T
I
T0
T1
F_15040_047.eps
040405
Line transistor
CONDUCTS
NC
9
5455
1
2
4
5
7
DEFLECTION
HORIZONTAL
COIL
1
2
5409
2
1
1
2
3
4
C948
5406
*
9412
GND_HOR
2417
2
1
5408
2419
3473
5409
3
4
3
4
5408
K
0V
140V
A
0V
*
*
J
7405
BU2520DX
2413
F418
6404
DMV1500M
3416
47R
2414
2n2
GND_HOR
2412
I473
F419
2416
Vbatt
Deflection T1-T2
27V
D
G
S
0V
4V8
E/W
2K2
3434
6471
I499
7406
I415
82K
3425
T
I
Line transistor
OPENS
T0
T1
T2
F_15040_048.eps
040405