Read Sharp 76DW-18H (serv.man3) Service Manual online
Wide Screen, Colour Television CW100 Chassis
Sharp Electronics (UK) Ltd
Technical Support
February 99
Page 6
Note:
To check that the power supply operating, disconnect R648 & measure the voltage at the cathode of
D708:
D708:
140V.
Power Supply working, short in line stage
<40V.
Short on a LT rail
0V.
Power Supply not operating (check that the CTV is not in standby mode)
Self Assessment Question
Name two conditions that will turn on Q702?
What is the supply voltage to IC1001 during standby?
What will be measured with a DVM at the base of Q702 during over-current?
If Q703 is open circuit, what would happen to the power supply frequency?
If load increase on the power supply, what will happen to the frequency?
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