CPD-101VS
SECTION 3
SAFETY RELATED ADJUSTMENT
When replacing or repairing the shown below table, the? HV Protector Circuit Check
following operational checks must be performed as a
Confirm that the voltage between cathode of D517 on D
safety precaution against X-rays emissions from the unit.
board and GND is more than 17.5 V DC and Using ex-
ternal DC Power Supply, apply the voltage shown below
Part Replaced ([)
between cathode of D517 and GND, and confirm that
HV ADJRV501
the HV HOLD DOWN circuite works. (TV Rester dis-
appears)
Part Replaced (])Standard voltage : Less than 31.70 V DC
HV RegulatorD board IC501, C553, C554,
Circuit CheckC555, C558, C561,Check Condition
R540, R564, R567,Y Input voltage : 100 � 120 V AC
RV501,T501 (FBT)Y Input signal : White Cross hatch at Max fH
HV Hold-down D board IC603, IC901, D515, Y Beam control : CONT : 255, BRT : 80
Circuit CheckD517, C540, C542,
C544, R543, R547,
? Beam Current Protector Check
R549, R552,
T501 (FBT)Connect a variable resistor (20 kW or more) and an am-
meter in series between FBT pin !] on D board and �15
Beam CurrentD board IC603, IC604, IC901,
V line. Decrease gradually the resistance of the variable
Protector CircuitC535, C541, R515,
CheckR545, R546, R548,resistor from maximum to minimum, and confirm that
R550, R934,the Beam Current Protector Circuite works (TV Rester
T501 (FBT)disappears). The current must be within the range shown
Confirm one minute later turning on the power.below.*
Y Standard current : Less than 1.50 mA
Check Condition
Y Input voltage : 100 � 120 V AC
Y Input signal : White Cross hatch at Max fH
Y Beam control : CONT : 255, BRT : 80
? B+ Voltage Check
Standard voltage : 150.0 ? 3.0 V DC
Check Condition
Y Input voltage : 100 � 120 V AC
Note :Use NF power supply or make sure that
distortion factor is 3% or less.
Y Input signal : White Cross hatch at 64.0 kHz
Y Beam control : CONT : 255, BRT : 80
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ACEC
