Working Method Of High Voltage Protection Circuit Of Tn201Auv Crt - Haier TN201AUV Service Manual

WORKING METHOD OF HIGH VOLTAGE PROTECTION CIRCUIT OF TN201AUV
CRT
1. The working method
The electrical level masters the high voltage control system of this model
th
of the 34 pin of the main decoding chip˙LA76814, when the 34
High voltage, LA76814 cuts the line square-wave output on 27
line triode V432 holds, and the line output amplifier stops and generate no
more high voltages. This process is divided by R412 and R416. If the divided
potential still can break the stabilizer diode VD12, it will direct the work on the
LA76814 and raise the potential on its 34
protection process. The time constant function by C412 and R414 will give a
delay to the high voltage protection circuit.
Diagram as follows:
II. List of components that decides the X-ray generation
No. Description
U901 CRT
N101 I.C
V431 Triode
T431 H. Drive Amp.
V432 Triode
C436 H. Volt. ceramic
capacitor
T471 H. Output Amp.
th
pin, thus run the high voltage
Model
54SX503-Y22
LA76814
2SC2383-O
JDT1904
2SD1651-CTV-YB
CT81-2R-2KV-470PF-K
JF0510-191129
th
pin output
th
pin, thus the
Origination
IRICO
SANYO
No.4 E-Component
Firm,
FoShan
Jingshi, Shenzhen
No.4 E-Component
Firm,
FoShan
Hongming, Dongguan
Jingshi, Shenzhen
12