Read Sony CPD-205F / CPD-205FT Service Manual online
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CPD-205F/205FT
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.
•
Beam Protector Check
(1) Software logic circuit
1) Confirm that the Beam current protector by software
logic works and CRT screen disappearing when con-
nect 150 k
Ω
resister in parallel with R542 on
D1 board.
(2) Hardware logic circuit
1) Using an external DC Power Supply, applying volt-
age of 5.00 V to between !/ pin of IC901 D1 board
and GND.
2) Confirm that the Beam current protector circuit by
hardware logic works and CRT screen disappearing
when shorted to between !] pin of T501 (FBT) and
GND.
Check Condition
• Input voltage : 120 V AC
• Input signal
: All white at 60.0 kHz
(VESA 1024 x 768)
• Beam control : CONT and BRT
→
Maximum
•
B+ Voltage Check
Standard voltage : 169.0
±
1.0 V DC
Check Condition
• Input voltage : 120 V AC
Note : Use NF power supply or make sure that
distortion factor is 3% or less.
• Input signal
: Cross hatch at 80.0 kHz
• Beam control : CONT, BRT
→
Maximum
HV Regulator
Circuit
Circuit
HV Protector
Circuit
Circuit
Beam Current
Protector Circuit
Protector Circuit
Part Replaced (
]
)
D1 board IC501, Q505, Q510,
D505, D512, D516,
C506, C526, C531,
C532, C535, C558,
R512, R532, R535,
R536, R537, R538,
RV501, T501 (FBT)
C506, C526, C531,
C532, C535, C558,
R512, R532, R535,
R536, R537, R538,
RV501, T501 (FBT)
D1 board IC701, D800, D801
C709, C803, C804,
R706, R800, R804,
R808, T501(FBT)
• Mounted D1 board
R706, R800, R804,
R808, T501(FBT)
• Mounted D1 board
D1 board IC701, IC901, Q801,
D517, D802, C537,
C806, C807, C912,
R539, R540, R541,
R542, R809, R810,
R811, R812, R816,
R933, T501(FBT)
• Mounted D1 board
C806, C807, C912,
R539, R540, R541,
R542, R809, R810,
R811, R812, R816,
R933, T501(FBT)
• Mounted D1 board
*
Confirm one minute later turning on the power.
•
HV Protector Check
Confirm that the HV protector circuit works and CRT
screen disappearing when apply the voltage as shown
below between Anode of D800 on D1 board and GND
using an external DC Power Supply.
• Standard voltage : Anode of D800 less than 28.90 V
DC
Check Condition
• Input voltage : 120 V AC
• Input signal
: Dot at 60.0 kHz
(VESA 1024 x 768)
• Beam control : BRT and CONT
→
Minimum
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