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CPD-E200E
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 ADJ
HV Regulator
Circuit Check
HV Protector
Circuit Check
Beam Current
Protector Circuit
Check
*
Confirm one minute later turning on the power.
HV Regulator Check
1) Input cross hatch signal (white lines on black).
: fH = 69.0kHz
2) CONT maximum and BRT center.
3) Cut off Screen VR (G2).
4) Input voltage : 120
5) Confirm that the voltage is within the voltage range
shown below.
Standard voltage : 27.0kV
6) When replacing components identified by
sure to recheck the High Voltage.
7) Verify the High Voltage as shown above (27.0 kV
0.2kV) is within specification. If not, set H. SIZE
data at minimum (-127) and then adjust RV501 on
"D" Board.
SAFETY RELATED ADJUSTMENT
[
Part Replaced (
)
RV501
]
Part Replaced (
)
D board IC501, C532, C534,
C539, C553, C554,
C555, C556, C558,
C561, 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)
D board IC605, IC607, IC901,
C535, C541, R545,
R546, R548, R550,
R596, R934,
T501 (FBT)
2 VAC
0.2kV DC
]
SECTION 3
8) After adjusting the High Voltage within specifica-
tion, put the RV cover on RV501 as shown below
and apply sufficient amount of RTV around RV501.
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 0.01 V DC
Check Condition
• Input voltage : 120
• Input signal
• Beam control : CONT : min, BRT : min
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
Check Condition
• Input voltage : 120
• Input signal
• Beam control : CONT : min, BRT : min
, make
B+ Voltage Check
Standard voltage : 179.0
Check Condition
• Input voltage : 120
Note : Use NF power supply or make sure that
distortion factor is 3% or less.
• Input signal
• Beam control : CONT : max, BRT : center
3-1
RV501
2 V AC
: White cross hatch at 69.0kHz
+0.00
mA
-0.10
2 V AC
: White cross hatch at 31.0kHz
3.0 V DC
2V AC
: White cross hatch at 69.0 kHz
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