CPD-E210
SECTION 3
SAFETY RELATED ADJUSTMENTS
When replacing parts shown in the table below, the8)After adjusting thHigh Veolta within ge specification,
following operational checks must be performed as aput the RV cover on RV501 as shoFigure 1 anwn iapplyn d
safety precaution against X-ray emissions from the unit.sufficient amount of RTV around RV501.
Part Replaced ( )
b) HV Protector Circuit Check
HV ADJRV5011) Confirm that the voltage between cathode of D517 and
GND is more than 27.5 VDC.
Part Replaced ( )2) Using an external DC Power supply, apply the voltage
HV RegulatorD boardT501, IC501, RV501, R540,shown below between cathode of D517 on "D" and GND,
CircuitR541, R542, R544, R564, R567,and confirm that the HV Hold-Down circuit works. (Raster
R568, C532, C534, C539, C553,disappears)Apply DC Voltage: Less than 35.5 VDC.
C554, C555, C556, C558, C561
Check Condition
HV HOLDD board T501, R510, R543, R547, R549,
? Input voltage:100-120 VAC
DOWN CircuitR552, R595, D515, D517, C540,
? Input signal:(fH =80 kHz), White Cross Hatch
C542, C544, IC607, IC901
? Controls:CONT (max) & BRT (center)
Beam CurrentD boardT501, R545, R546, R548, R550,
Protector CircuitR596, R934, C535, C541,
c) Beam Protector Check (Software logic)
IC605, IC607, IC901
1) Using an external current source, apply < 1.55mA between
Allow the unit to warm up for one minute prior to checkingpin of FBT T501) and GND,(and confirm that the
the following conditions:raster fades out.
a) HV Regulator CheckCheck Condition
1) Input white cross hatch signal. (fH = 80 kHz) ? Input voltage:100-120 VAC
2) CONT maximum and BRT center? Input signal :(fH = 80 kHz), White Cross Hatch
3) Cut off Screen VR (G2).? Controls:CONT (max) & BRT (center)
4) Input voltage: 120 ? 2 VAC.
5) Confirm that the voltage is within the voltage range
shown below.d) B+ Voltage Check
Standard voltage: 26.9 KV ? 0.4 KV1) Input white cross hatch (fH = 80 kHz) signal.
6) When replacing components identified by , make2) CONT (max) & BRT (center).
sure to recheck the High Voltage.3) Input voltage: 100-120 VAC.
7) Verify the High Voltage as shown above (26.9 KV ? 0.4 KV)Note: Use NF power supply or make sure that
is within specification. If not, adjust RV501 ondistortion factor is 3% or less.
D board.4) Confirm that thltage is e vwithin the vooltage
range shown below.
Standard voltage: 180 ? 3.0 VDC
RV501
Figure 1
? 14 ? |
ACEC
