Safety Related Adjustment - Sony TRINITRON PVM-14N1A Service Manual

SECTION 4
SAFTY RELATED ADJUSTMENT
(US Model only)
The following adjustments should always be performed when HOLD-DOWN CIRCUIT VOLTAGE CONFIRMATION |
replacing the following components (marked with b4, [don the
schematic diagram). Check Condition Input voltage : 130 +3V
Input signal : Monoscope signal
Marking Parts (b4) .... C501, C502, C503, C504 Control - BRT & PIC Normal
; +B voltage : less than 116.0VDC
Marking Parts (li ) .... C317, C318, C501, C502, C503, C504,
C507, D102, D103, L505, Q102, R107, — Hold down circuit (Tertiary coil detection voltage)
R108, R110, R304, R305, R306, R307, Confirmatory item : 95.0V (14 inch), 125.0V (20 inch) voltage
T501, ICOO1, [C301 should be applied to the cathode side of D103.
B+ VOLTAGE CONFIRMATION a) When Iasi = 600 + SOWA (14 inch), 1000 + SOWA (20 inch)
raster goes out when applying less than DC 116.0 + 0.2V
Standard : less than 116.0VDC (14 inch), 153.0 + 0.2V (20 inch) voltage to the cathode side
Check Condition Input voltage : 130 +5VAC of D103.
Note : Use NF Power Supply or make
sure that distortion factor is 3% Input signal: ALL white
or less.
Input signal : Monoscope signal b) When Iasi =40 + 20uA (14 inch), 120 + 201A (20 inch) raster
Controls : BRT & PIC, Normal goes out when applying less than DC 124 + 0.2V (14 inch),
153.0 +t 0.2V (20 inch) voltage to the cathode side of D103.
Input signal : Dot
A BOARD (CONDUCTOR SIDE)
Digital multimeter
DC power supply