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When replacing or repairing the shown below table, the
following operational checks must be performed as a
safety precaution against X-rays emissions from the unit.
HV ADJ
HV Regulator
D Board T901(FBT), IC901,
Circuit Check
HV Protector
D Board T901(FBT), R917,
Circuit Check
Beam Current
D Board R933, R932, R921,
Protector Circuit
Check
* Confirm one minute after turning on the power.
a) High Voltage Adjustment
1) Adjust the high voltage 27.0 kV ± 0.2 kV by the
RV901.
Note:Perform high voltage adjustment after the rough adjust-
ments were completed on PICTURE size and FOCUS.
SECTION 3
SAFETY RELATED ADJUSTMENT
Part Replaced ([)
RV901
Part Replaced (])
R924, R925, RV901
• Mounted D board
R918, R923, R920,
R919, R1004, C920,
D911, R912,
• Mounted D board
R1006, D915, D917,
IC901, T901(FBT)
• Mounted D board
b) High Voltage Hold-Down Function Check
1) Apply the voltage 21.1
ode and GND shown on the right to confirm that the
RASTER will vanish.
c) Beam Current Protector Function Check
1) Connect Power Supply 1.68 mA to between pin 11 ~
GND of FBT (T901).
2) Confirm that voltage on C922 (ABL DET.) is less
than 2.25 V or monitor will shut down.
d) OCP Function Check
1) Turn ON Power Supply.
2) Connect 3 Z/20 W of Resistor between +200 V Line
and GND, and make sure that OCP will function
(Power LED will vanish and the sound "chi,chi,chi
will be heard.), and cut-off AC input promptly.
e) Power Supply Operation Check
1) Apply AC100 V to the D Board.
2) Make sure that the line voltage at the both ends of
C621 is 200 ± 3.0 VDC.
3-1
6551-T3N/6551-U3N
+ 0.00
VDC between D912 cath-
– 0.05
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