Disclaimer: This information is provided “as is” without warranty of any kind
either expressed or implied, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose.
REV 12-1
SUBJECT: No Raster
BACKGROUND:There is a delay in the 12V/DC operation. Due to the delay the
166V/DC line operates first when power is first applied to the monitor. This will
affect the horizontal circuit and cause a surge, which in turn will cause Q403 and
Q408 to short.
SOLUTION: Insert a IN4937 diode into location D300 and substitute R401 (33
ohm, 1/2W) with a 220 uH coil.
PARTS LIST:
Original Parts
New Parts
Location
Parts Code
Description
Parts Code
Description
R401
911-123307FF R-Carbon, 33, 1/2w
925-001001AN Coil, 220 uH
D300
None
None
893-314937AC Diode, IN4937
SERVICE BULLETIN
PRODUCT: COMPUTER MONITOR
BULLETIN: MONITOR 95-008
MODEL: SAMTRON SC-428PT/L
