12
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
of the 34
th
pin of the main decoding chip
˙
LA76814, when the 34
th
pin output
High voltage, LA76814 cuts the line square-wave output on 27
th
pin, thus the
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
th
pin, thus run the high voltage
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
Model
Origination
U901 CRT
54SX503-Y22
IRICO
N101 I.C
LA76814
SANYO
V431 Triode
2SC2383-O
No.4
Firm,
FoShan
E-Component
T431 H. Drive Amp.
JDT1904
Jingshi, Shenzhen
V432 Triode
2SD1651-CTV-YB
No.4
Firm,
FoShan
E-Component
C436 H. Volt. ceramic
capacitor
CT81-2R-2KV-470PF-K Hongming, Dongguan
T471 H. Output Amp.
JF0510-191129
Jingshi, Shenzhen
Содержание TN201AUV
Страница 8: ...8 ...