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.
Part Replaced (
RV501 (HV ADJ)
Part Replaced (
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.

SAFETY RELATED ADJUSTMENT

D BOARD
[
)
]
)
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)