Read Sony CPD-201VS Service Manual online
CPD-201VS
SECTION 3
SAFETY RELATED ADJUSTMENT
Part Replaced (
[
)
RV501
HV ADJ
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 Protector Circuit Check
Confirm that the voltage between cathode of D517 on D
board and GND is more than 28.5 V DC and Using ex-
ternal DC Power Supply, apply the voltage shown below
between cathode of D517 and GND, and confirm that
the HV HOLD DOWN circuite works. (TV Rester dis-
appears)
Standard voltage : Less than 31.70 V DC
Check Condition
• Input voltage : 100 – 120 V AC
• Input signal
: White Cross hatch at Max fH
• Beam control : CONT : 255, BRT : 80
•
Beam Current Protector Check
Connect a variable resistor (20 k
Ω
or more) and an am-
meter in series between FBT pin !] on D board and –15
V line. Decrease gradually the resistance of the variable
resistor from maximum to minimum, and confirm that
the Beam Current Protector Circuite works (TV Rester
disappears). The current must be within the range shown
below.
• Standard current : Less than 1.50 mA
Check Condition
• Input voltage : 100 – 120 V AC
• Input signal
: White Cross hatch at Max fH
• Beam control : CONT : 255, BRT : 80
•
B+ Voltage Check
Standard voltage : 150.0
±
3.0 V DC
Check Condition
• Input voltage : 100 – 120 V AC
Note : Use NF power supply or make sure that
distortion factor is 3% or less.
• Input signal
: White Cross hatch at 64.0 kHz
• Beam control : CONT : 255, BRT : 80
HV Regulator
Circuit Check
Circuit Check
HV Hold-down
Circuit Check
Circuit Check
Beam Current
Protector Circuit
Check
Protector Circuit
Check
Part Replaced (
]
)
D board IC501, C553, C554,
C555, C558, C561,
R540, R564, R567,
RV501, T501 (FBT)
R540, R564, R567,
RV501, T501 (FBT)
D board IC603, IC901, D515,
D517, C540, C542,
C544, R543, R547,
R549, R552,
T501 (FBT)
C544, R543, R547,
R549, R552,
T501 (FBT)
D board IC603, IC604, IC901,
C535, C541, R515,
R545, R546, R548,
R550, R934,
T501 (FBT)
R545, R546, R548,
R550, R934,
T501 (FBT)
*
Confirm one minute later turning on the power.
3-1
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