21T3 (E)
2-1
SECTION 2
SAFETY RELATED ADJUSTMENT
HV Regulator
Circuit Check
HV Protector
Circuit Check
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.
Part Replaced (
[
)
RV901
HV ADJ
*
Confirm one minute after turning on the power.
a) HV Regulator Circuit Check
1) Turn the RV901 slowly, and adjustment so that high
voltage is in the specified range.
[Specification]: 27.00
±
0.05 kV
2) Check that the voltage of D912 cathode on the D
board is 17.0 V or more.
b) HV Protector Circuit Check
1) Using external DC Power Supply, apply the voltage
shown below between cathode of D912 and GND,
and check that the RASTER disappers.
[Specification]: 19.95 + 0.00/– 0.05 V
Part Replaced (
]
)
D Board C925, IC901, R901,
R902, R905, R924,
R925, R926, RV901,
T901 (FBT)
• Mounted D Board
D Board C920, C923, D911,
D912, R903, R917,
R918, R919, R920,
R923, T901 (FBT)
• Mounted D Board
N Board IC1001, RB1001
• Mounted N Board
Beam Current
Protector Circuit
Check
Part Replaced (
]
)
D Board C930, D917, R921,
R932, R933, R935,
T901 (FBT)
• Mounted D Board
N Board IC1001, RB1001
• Mounted N Board
Summary of Contents for 21T3
Page 9: ...21T3 E 1 2 1 2 A1 BOARD C BLOCK REMOVAL 1 A1 board C BLOCK CN315 CN318 GND GND ...
Page 27: ...21T3 E 4 5 4 3 CIRCUIT BOARDS LOCATION D H3 A1 L2 DA N ...
Page 39: ...21T3 E 4 17 h3 USER CONTROL H3 BOARD ...
Page 41: ...21T3 E 4 19 l2 CY LCC L2 BOARD Conductor Side L2 BOARD Component Side ...
Page 86: ...21T3 E 86 English 2001IL05 Data Made in Japan 2001 9 9 978 707 01 ...