Specifications

Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 90 ES1E9.
T2 - T3
Figure 9-4 Deflection T2 - T3
At T2 the deflection current is 0 Amp. The fly-back capacitor
(2412/2413/2414) is charged to approximately 1200 V and will
discharge now. As a result of this, the deflection current will
bend the electron beam to the left of the screen.
T3 - T4
Figure 9-5 Deflection T3 - T4
When the fly-back capacitor (2412/2413/2414) is discharged,
the current is at its maximum negative level. This maximum
negative current will then charge the fly-back capacitor (2412/
2413/2414) with a negative voltage. At this moment, fly-back
diode 6404 will start conducting. The voltage at Scap 2418
causes a linear current flow from T3 - T4. This causes a
deflection current which bends the electron beam back from
the left to the centre of the screen.
9.2.2 Standby and Start Up
In Standby mode, both +5V and Vbatt are not available in order
to meet the standby power saving requirement.
During the start-up phase, +5V is switched on by STANDBY via
7548/7547/7545 and Vbatt is switched on by STANDBY via
7573.
After this, Hdrive is output from the SSB to driver 7404 (see
circuit diagram A2), and consequently to the deflection output
stage (7405). During the slow start-up phase, the Hdrive duty
cycle gradually increases from small to normal. At the
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 T2-T3
27V
D
G
S
0V
4V8
E/W
2K2
3434
6471
I499
7406
I415
82K
3425
T
I
Line transistor
OPEN
Fly-back caps
DISCHARGE
T0
T1
T2
T3
F_15040_050.eps
040405
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 T3-T4
27V
D
G
S
0V
4V8
E/W
2K2
3434
6471
I499
7406
I415
82K
3425
T
I
Diode
CONDUCTS
T0
T1
T2
T3
T4
F_15040_049.eps
040405