Safety Related Adjustment - Sony CPD-E540 Service Manual

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 C925, IC901, R901,
Circuit Check
HV Protector D Board C920, C923, D911,
Circuit Check
N Board IC1001, RB1001
SECTION 2

SAFETY RELATED ADJUSTMENT

Part Replaced ([)
RV901
Part Replaced (])
R902, R905, R924,
R925, R926, RV901,
T901 (FBT)
• Mounted D Board
D912, R903, R917,
R918, R919, R920,
R923, T901 (FBT)
• Mounted D Board
• Mounted N Board
Beam Current D Board C930, D917, R921,
Protector Circuit
Check
N Board IC1001, RB1001
* 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 (])
R932, R933, R935,
T901 (FBT)
• Mounted D Board
• Mounted N Board
CPD-E540 (E) 2-1