— 14 —
CPD-E210
8) After adjusting the High Voltage within specification,
put the RV cover on RV501 as shown in Figure 1 and apply
sufficient amount of RTV around RV501.
b) HV Protector Circuit Check
1) Confirm that the voltage between cathode of D517 and
GND is more than 27.5 VDC.
2) Using an external DC Power supply, apply the voltage
shown below between cathode of D517 on "D" and GND,
and confirm that the HV Hold-Down circuit works. (Raster
disappears) Apply DC Voltage: Less than 35.5 VDC.
Check Condition
• Input voltage: 100-120 VAC
• Input signal: (fH =80 kHz), White Cross Hatch
• Controls: CONT (max) & BRT (center)
c) Beam Protector Check (Software logic)
1) Using an external current source, apply < 1.55mA between
pin
of FBT (T501) and GND, and confirm that the
raster fades out.
Check Condition
• Input voltage: 100-120 VAC
• Input signal : (fH = 80 kHz), White Cross Hatch
• Controls: CONT (max) & BRT (center)
d) B+ Voltage Check
1) Input white cross hatch (fH = 80 kHz) signal.
2) CONT (max) & BRT (center).
3) Input voltage: 100-120 VAC.
Note: Use NF power supply or make sure that
distortion factor is 3% or less.
4) Confirm that the voltage is within the voltage
range shown below.
Standard voltage: 180 ± 3.0 VDC
SECTION 3
SAFETY RELATED ADJUSTMENTS
When replacing parts shown in the table below, the
following operational checks must be performed as a
safety precaution against X-ray emissions from the unit.
Allow the unit to warm up for one minute prior to checking
the following conditions:
a) HV Regulator Check
1) Input white cross hatch signal. (fH = 80 kHz)
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: 26.9 KV ± 0.4 KV
6) When replacing components identified by
, make
sure to recheck the High Voltage.
7) Verify the High Voltage as shown above (26.9 KV ± 0.4 KV)
is within specification. If not, adjust RV501 on
D board.
RV501
Part Replaced ( )
RV501
HV ADJ
Part Replaced ( )
D board T501, IC501, RV501, R540,
R541, R542, R544, R564, R567,
R568, C532, C534, C539, C553,
C554, C555, C556, C558, C561
HV Regulator
Circuit
D board T501, R510, R543, R547, R549,
R552, R595, D515, D517, C540,
C542, C544, IC607, IC901
HV HOLD
DOWN Circuit
D board T501, R545, R546, R548, R550,
R596, R934, C535, C541,
IC605, IC607, IC901
Beam Current
Protector Circuit
Figure 1
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