Read Sony CPD-G200 / CPD-G200P Service Manual online
CPD-G200/G200P
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
Using an external DC Power Supply, apply the voltage
shown below between cathode of D517 on D board and
GND, and confirm that the HV HOLD DOWN circuite
works. (TV Raster disappears)
Standard voltage : 35.80
+0.00
V DC
Check Condition
• Input voltage : 120
±
2 V AC
• Input signal
: Cross hatch (Black lines on white) at
68.7kHz
• Beam control : CONT : 127 (cent), BRT : 255 (max)
•
Beam Current Protector Check
An ammeter in series between FBT pin !] on D board
and GND, then, decrease gradually the resistance of the
variable resistor from maximum to minimum, and con-
firm that the Beam Current Protector Circuite works
(TV Raster disappears). The current must be within the
range shown below.
• Standard current : 1.55
+0.00
mA
Check Condition
• Input voltage : 120
±
2 V AC
• Input signal
: Cross hatch (Black lines on white) at
68.7kHz
• Beam control : CONT : 127 (cent), BRT : 255 (max)
•
B+ Voltage Check
Standard voltage : 178.0
±
3.0 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 (White lines on black) at
68.0 kHz
• Beam control : CONT : 127 (cent), BRT : 255 (max)
HV Regulator
Circuit Check
Circuit Check
HV Protector
Circuit Check
Circuit Check
Beam Current
Protector Circuit
Check
Protector Circuit
Check
Part Replaced (
]
)
D board IC501, C532, C534,
C539, C553, C554,
C555, C556, C558,
C561, R540, R541,
R542, R544, R564,
R567, R568, RV501,
T501 (FBT)
C555, C556, C558,
C561, R540, R541,
R542, R544, R564,
R567, R568, RV501,
T501 (FBT)
D board IC607, IC901, D515,
D517, C540, C542,
C544, R510, R543
R547, R549, R552,
R595,
T501 (FBT)
C544, R510, R543
R547, R549, R552,
R595,
T501 (FBT)
D board IC605, IC607, IC901,
C535, C541, R545,
R546, R548, R550,
R596, R934,
T501 (FBT)
R546, R548, R550,
R596, R934,
T501 (FBT)
*
Confirm one minute later turning on the power.
3-1
-0.10
-0.10
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