CPD-E200
SECTION 3
SAFETY RELATED ADJUSTMENTS
When replacing parts shown in the table below, the8)After adjusting the High Voltage within specification,
following operational checks must be performed as aput the RV cover on RV501 as shown below and apply
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 an
GND is more than 27.5 VDC.
Part Replaced ( )2) Using an external DC Power supply, apply the voltage
HV RegulatorD board T501, IC501, RV501, R541,shown below between cathode of D517 on "D" and GND,
CircuitR542, R544, R564, R567, R568,and confirm that the HV Hold-Down circuit works. (Raster
C532, C534, C539, C553, C554,disappears) Apply DC Voltage: Less than 35.8 VDC.
C555, C556, C558, C561
Check Condition
HV HOLDD board T501, R510, R543, R547, R549,
Y Input voltage: 120 ? 2 VAC
DOWN CircuitR552, R595, D515, D517, C540,
Y Input signal: (fH = 69 kHz), White Cross Hatch
C542, C544, IC607, IC901
Y Controls: CONT (max) & BRT (center)
Beam CurrentY B+ Voltage: 179 ? 3.0 VDCD board T501, R545, R546, R548, R550,
Protector Circuit
R596, R934, C535, C541,
IC605, IC607, IC901
c) Beam Protector Check (Software logic)
Allow the unit to warm up for one minute prior to checking1) Using an external current source, apply < 1.55mA between
the following conditions:pin !� of FBT (T501) and GND, and confirm that the
raster fades out.
a) HV Regulator Check
1) Input white cross hatch signal. (fH = 69 kHz)Check Condition
2) CONT maximum and BRT centerY Input voltage: 120 ? 2 VAC
3) Cut off Screen VR (G2).Y Input signal: (fH = 69 kHz), White Cross Hatch
4) Input voltage: 120 ? 2 VACY Controls: CONT (max) & BRT (min)
5) Confirm that the voltage is within the voltage range
shown below.
Standard voltage: 26.9 KV ? 0.4 KVd) B+ Voltage Check
6) When replacing components identified by , make1) Input white cross hatch (fH = 69 kHz) signal.
sure to recheck the High Voltage.2) CONT (max) & BRT (center)
7) Verify the High Voltage as shown above (26.9 KV ?3) Input voltage: 120 ? 2 VAC
0.4 KV) is within specification. If not, set H. SIZE dataNote: Use NF power supply or make sure that
at minimum (-127) and then adjust RV501 on "D" Board.distortion factor is 3% or less.
4) Confirm that the voltage is within the voltage
range shown below.
Standard voltage: 179 ? 3.0 VDC
RV501
N 15 N |
ACEC
