CPD-2001G
SECTION 3
SAFETY RELATED ADJUSTMENT
When replacing parts shown in the table below, the fol-b) HV Hold-Down Check
lowing operational chacks must be performed as a safety1) Using an external DC Power supply, apply the volt-
precaution against X-ray emissions from the unit.age shown below between cathode of D517 on OD�
Board and GND, and confirm that the HV Hold-D BOARD
Down circuit works. (Raster disappears)
Apply DC Voltage: 31.4 ? 0.01 VDCPart Replaced ([)
RV501 (HV ADJ)
Check ConditionPart Replaced (])
Y Input voltage : 120 ? 2 VAC
Y Input signal :(fH = 64 kHz), White Cross HatchIC501, IC605, IC901, D517, C535, C540, C541, C542,
Y Controls: CONT (max) & BRT (center)C544, C553, C554, C555, C558, C561, R545, R546,
Y B+ Voltage : 182.5 ? 3.0 VDCR547, R548, R549, R550, R552, R564, R567, RV501,
T501 (FBT)
* Allow the unit to warm up for one minute prior to check-c) Beam Protector Check (Software logic)
ing the following conditions:1) Using an external DC power supply, apply the volt-
age 8.8 ? 0.01 VDC between pin !� of FBT (T501)
a) HV Regulator Checkand GND, and confirm that the voltage across C541
is 3.7 VDC or less.1) Input white cross hatch signal. (fH = 64 kHz)
2) Minimum CONT and BRT controls.
3) Cut off Screen VR (G2).Check Condition
Y Input voltage : 120 ? 2 VAC4) Input voltage: 120 ? 2 VAC
Y Input signal :(fH = 64 kHz), White Cross Hatch5) Confirm that the voltage is within the voltage range
Y Controls: CONT (max) & BRT (center)shown below.
Standard voltage: 25.0 ? 0.5KVDC
6) When replacing components identified by ], make d) B+ MAX. Check
sure to recheck the High Voltage.1) Input white cross hatch (fH = 64 kHz) signal.
7) Verify the High Voltage as shown above (25 ?2) CONT (max) & BRT (center)
0.5KVDC) is within specification. If not, set H. SIZE3) Input voltage: 120 ? 2 VAC
data at minimum (�127) and then adjust RV501 onNote: Use NF power supply or make sure that distor-
OD� Board.tion factor is 3% or less.
8) After adjusting the High Voltage within specifica-4) Confirm that the B+ voltage is within the voltage
tion, put the RV cover on RV501 as shown belowrange shown below.
and apply sufficient amount of RTV around RV501.Standard voltage: 182.5 ? 3.0 VDC
104
RV501
3-1 |
ACEC
SONY
