Read Sony CPD-120AS Service Manual online
CPD-120AS
– 14 –
SECTION 3
SAFETY RELATED ADJUSTMENT
Part Replaced (
[
)
RV501
HV ADJ
When replacing or repairing the shown below table, the fol-
lowing operational checks must be performed as a safety
precaution against X-rays emissions from the unit.
•
Beam Current Protector Check
Using an external DC Power Supply, applying voltage of
7.00 ± 0.05 V between !] pin of FBT (T501) and GND,
and confirm that the vlotage of both ends C519 is with in
the Voltage range shown below.
• Standard voltage : Less than 3.26 V DC
Check Condition
• Input voltage : 120.0 ± 20 V AC
• Input signal
: Dot at 64.0 kHz
(VESA 1280
×
1024)
• Beam control : CONT : 100 %, BRT : 40 %
•
B+ Voltage Check
Standard voltage : 149.0
V DC
Check Condition
• Input voltage : 120.0 ± 2.0 V AC
Note : Use NF power supply or make sure that
distortion factor is 3% or less.
• Input signal
: All white at 60.0 kHz
(VESA 1024
×
768)
• Beam control : CONT : 100 %, BRT : 40 %
HV Regulator
Circuit
Circuit
HV Protector
Circuit
Circuit
Beam Current
Protector Circuit
Protector Circuit
Part Replaced (
]
)
D board IC801, C509, C533,
C542, C548, C802,
C814, C815, R506,
R508, R538, R539,
R540, R541, R807,
R822, R823, R824,
RV501, T501 (FBT)
C814, C815, R506,
R508, R538, R539,
R540, R541, R807,
R822, R823, R824,
RV501, T501 (FBT)
D board IC501, IC801, IC904,
D511, D515, D516,
C515, C516, C517,
C525, R532, R533,
R534, R535, R557,
R558, R996,
T501 (FBT)
• Mounted D board
C515, C516, C517,
C525, R532, R533,
R534, R535, R557,
R558, R996,
T501 (FBT)
• Mounted D board
D board IC901, D596, C519,
C528, C549, C904,
R542, R543, R544,
R545, R939
• Mounted D board
R542, R543, R544,
R545, R939
• Mounted D board
*
Confirm one minute later turning on the power.
•
HV Protector Circuit Check
Confirm that the HV protector circuit works and CRT
screen disappearing when apply the voltage as shown be-
low between Cathode of D511 on D board and GND us-
ing an external DC Power Supply.
• Standard voltage : 35.20 ± 0.05 V DC
Check Condition
• Input voltage : 120.0 ± 2.0 V AC
• Input signal
: Dot at 64.0 kHz
(VESA 1280
×
1024)
• Beam control : CONT : 100 %, BRT : 40 %
+ 2.0
– 3.0
– 3.0
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