Safety Related Adjustment - Sony TRINITRON CPD-200GS Service Manual

CPD-200GS
When replacing parts shown in the table below, the follow-
ing operational chacks must be performed as a safety pre-
caution against X-ray emissions from the unit.
IC501, IC605, IC901, D517, C535, C540, C541,
C542, C544, C553, C554, C555, C558, C561, R545,
R546, R547, R548, R549, R550, R552, R564, R567,
RV501, T501 (FBT)
* Allow the unit to warm up for one minute prior to check-
ing the following conditions:
a) HV Regulator Check
1) Input white cross hatch signal. (fH = 64 kHz)
2) Minimum CONT and BRT controls.
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: 25.0 ± 0.5KVDC
6) When replacing components identified by ], make
sure to recheck the High Voltage.
7) Verify the High Voltage as shown above (25 ±
0.5KVDC) 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.
Get user manuals: See SafeManuals.com

SAFETY RELATED ADJUSTMENT

D BOARD
[
Part Replaced ( )
RV501 (HV ADJ)
]
Part Replaced ( )
RV501
SECTION 3
b) HV Hold-Down Check
1) Using an external DC Power supply, apply the volt-
age shown below between cathode of D517 on "D"
Board and GND, and confirm that the HV Hold-
Down circuit works. (Raster disappears)
Apply DC Voltage: 31.4 ± 0.01 VDC
Check Condition
• Input voltage : 120 ± 2 VAC
• Input signal
• Controls
• B+ Voltage
c) Beam Protector Check (Software logic)
1) Using an external DC power supply, apply the volt-
age 8.8 ± 0.01 VDC between pin !¡ of FBT (T501)
and GND, and confirm that the voltage across C541
is 3.7 VDC or less.
Check Condition
• Input voltage : 120 ± 2 VAC
• Input signal
• Controls
d) B+ MAX. Check
1) Input white cross hatch (fH = 64 kHz) signal.
2) CONT (max) & BRT (center)
3) Input voltage: 120 ± 2 VAC
Note: Use NF power supply or make sure that distor-
tion factor is 3% or less.
4) Confirm that the B+ voltage is within the voltage
range shown below.
Standard voltage: 182.5 ± 3.0 VDC
3-1
:(fH = 64 kHz), White Cross Hatch
: CONT (max) & BRT (center)
: 182.5 ± 3.0 VDC
:(fH = 64 kHz), White Cross Hatch
: CONT (max) & BRT (center)