Adjustments; Vs, Vd Voltage Adjustment (Pdm-4200) - Sony KE-42XBR900 Service Manual

2-1. VS, VD Voltage Adjustment (PDM-4200)

• Preparation for adjustment
1.Slide the DIP switch (S3201) No. 8 of P board to on position with no silkscreen mark r.
2.Connect a digital voltmeter to the following terminals of G board.
VS voltage=G board TP1701 (VS)-TP1502 (GND)
VD voltage=G board TP1501 (VD)-TP1502 (GND)
3.Connect a AC cord in DISPLAY UNIT.
4.Perform the adjustment in 10 seconds after connecting the cord.
• Procedure for adjustment
1. Slide the DIP switch (S3201) No. 7 of P board to on position with no silkscreen mark r.
2. Confirm the lighting of SONY LOGO LED.
3. Adjust the VS voltage to the following voltage value.
+6V
VS voltage of proper value for each model.
–0V
Ex.) VS proper value=185V thru 185.6V at 185V.
(Check the proper value with a seal on upper left of panel unit. Refer to right Fig.)
4. Adjust the VD voltage to the following voltage value.
VD voltage ±0.3V of proper value for each model.
Ex.) VD proper value=64.7V thru 65.3V at 65.0V.
(Check the proper value with a seal on upper left of panel unit. Refer to right Fig.)
5. Check a Fan rotation.
6. Slide the DIP Switch (S3201) No. 7 of P board to the off position with the silkscreen mark
r.
7. Slide the DIP Switch (S3201) No. 8 of P board to the off position with the silkscreen mark
r.
8. Disconnect an AC cord of DISPLAY UNIT.
9. Reconnect the AC cord in one second.
10. Assure that "POWER ON/STANDBY" LEDs is flashing amber.
1
SECTION 2

ADJUSTMENTS

<SEAL POSITION>
SERIAL No.
301201440
Vd=65V
Vs=193.4V
CODE AA-01
Rear cover assy
BAR CODE SEAL
Panel unit
KE-42XBR900(UC) 2-1