CPD-E200E
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
±
0.01 V DC
Check Condition
• Input voltage : 120
±
2 V AC
• Input signal
: White cross hatch at 69.0kHz
• 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
+0.00
mA
Check Condition
• Input voltage : 120
±
2 V AC
• Input signal
: White cross hatch at 31.0kHz
• Beam control : CONT : min, BRT : min
•
B+ Voltage Check
Standard voltage : 179.0
±
3.0 V DC
Check Condition
• Input voltage : 120
±
2V AC
Note : Use NF power supply or make sure that
distortion factor is 3% or less.
• Input signal
: White cross hatch at 69.0 kHz
• Beam control : CONT : max, BRT : center
HV Regulator
Circuit Check
HV Protector
Circuit Check
Beam Current
Protector Circuit
Check
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)
*
Confirm one minute later turning on the power.
3-1
-0.10
•
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
±
2 VAC
5) Confirm that the voltage is within the voltage range
shown below.
Standard voltage : 27.0kV
±
0.2kV DC
6) When replacing components identified by
]
, make
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.
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.
RV501
104
Summary of Contents for CPD-E200E
Page 20: ...CPD E200E 4 4 MEMO ...
