Advertisement
TM-1650SDU
• HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT
MEASURING INSTRUMENTS
•
Fixed external DC power source (16.5V: Current capacitor over than 1A).
• Variable external DC power source (50V-150V:
Current capacitor over than 1.2A).
•
High voltage meter.
1) Memorize the position of SCREEN VR before adjustment.
2) Input the black and white signal{ color off) and decrease the SCREEN VR so that the picture does not appear on the screen.
3) Switch off the power and disconnect the power cord from the outlet.
4) Connect the probe of the HIGH VOLTAGE METER to the anode terminal of the CRT.
5) Using the fixed external DC power source, supply the DC voltage of 16.5V to No.6 pin of the S 1 connector of the MAIN PWB.
6) Using the variable external power source, supply the DC voltage of 53V to No.1 pin of the S1 connector of the MAIN PWB.
7) While gradually increasing the voltage of the variable DC power supply from 53V, make sure that the voltage immediately before the HIGH
VOLTAGE METER shuts down has fallen into the range of 26.4kV-31.2kV.
8) Return the voltage of the variable external power source to 53V and remove the power source and HIGH VOLTAGE METER
9) After connecting the power cord to the outlet, switch on the power.
10) Return the SCREEN VR to the original position, and make sure that the normal picture is displayed on the screen.
FLOWCHART
36
81
LB
SUPPLY
VHSS
T901
SW
TRANSF
B1
VOLTAGE
UP
LB
81
R572
R584
A
A
V
V
I
@TI
1112131415161
81
I
I
LB
X-RAY2
X-RAY1
RATCH UP
CIRCUIT
ti---t
ON
IC502
,23')
High up
'1:>ETECT
No. 51702
l
D575
I~
I....,
IC502
H.OUT
STOP
T551
HVT
H.OUT~
T551
i---•
HVT
•
•
•
•
•
Advertisement
