Samsung TSL3294HF Service Manual - Page 15

Note1., HOLD-DOWN OR SAFETY CIRCUIT INFORMATION, Fail Safe Test Point - reset

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Alignment and Adjustments Note1. HOLD-DOWN OR SAFETY CIRCUIT INFORMATION The high voltage hold-down circuit prevent TV from damage caused by abnormal high voltage. The energy of FBT(T444S) primary winding is transfered to the secondary winding and the amount of energy is exactly proportional to high voltage output. The voltage which is induced from high voltage output is filtered and applied to the reference pin (#12) of IC06 through fail safe circuit. If the high voltage is increase to higher point than hold down reference voltage (DZ403), this voltage is set by two resistors(RX01,RX02),then the voltage level of IC06 reference pin reaches to its threshold voltage and IC06 turns on. By the activation of IC06. The pulse of Horizontal drive turn to zero and the high voltage output fully disabled the three components, RX02,DD03 and DR22, Make hold down reference voltage. And the DZ403 current can flow through the three components and the current the voltage level of IC06 (#12) is maintained always at high level so the protection cannot be disabled (except reset AC power) . Fail Safe Test Point IC06 X-RAY Protection DC26 DR46 DD02 DR21 FBT(T444S) RX01 DX02 DX01 DZ403 Heater DD03 DR22 RX02 DC130V ABL H.Drive Anode Voltage Samsung Electronics 4-3

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Alignment and Adjustments
Samsung Electronics
4-3
The high voltage hold-down circuit prevent TV from damage caused by abnormal high voltage.
The energy of FBT(T444S) primary winding is transfered to the secondary winding and
the amount of energy is exactly proportional to high voltage output.
The voltage which is induced from high voltage output is filtered and applied to the reference
pin (#12) of IC06 through fail safe circuit.
If the high voltage is increase to higher point than hold down reference voltage
(DZ403), this voltage is set by two resistors(RX01,RX02),then the voltage level
of IC06 reference pin reaches to its threshold voltage and IC06 turns on.
By the activation of IC06.
The pulse of Horizontal drive turn to zero and the high voltage output fully disabled
the three components, RX02,DD03 and DR22, Make hold down reference voltage.
And the DZ403 current can flow through the three components and the current
the voltage level of IC06 (#12) is maintained always at high level so the protection
cannot be disabled
(except reset AC power) .
Note1.
HOLD-DOWN OR SAFETY CIRCUIT INFORMATION
IC06
X-RAY
Protection
DR46
DC26
DD03
DR22
RX02
DD02
DR21
RX01
DX02
DX01
DZ403
Heater
FBT(T444S)
Anode
Voltage
DC130V
ABL
H.Drive
Fail Safe Test Point