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Reference Schematic 52004 Main PWB for Schematic Details.
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For Review, look over the Schematic and identify these components and their functions.
1.
F901 and VA901
2.
T951, D954-57 and C951
3.
C901, C902 and C903
4.
D901 and C907
5.
IC911
6.
D911, R911,R930 and C914
7.
T921
8.
R912, R913 and R914
9.
R915 and D912
10.
D917 and D914
11.
D945 ~ RY951
12.
Q951
13.
IC921
This is the basic circuit configuration and use for all JVC Power Supplies. While some Power Supplies may omit or
add circuits, the general function of all JVC Power Supplies are the same.
Surge Protection: Stops circuit function if High Current (short) is
detected.
Standby Power: Supplies Standby DC voltage to Micon
Line Filter: Filtering of AC line noise
Main rectifier: Provides rectified DC to Switching Regulator and
Switching
Transformer.
Switching Regulator: Regulates Switching Voltages out of
Transformer
Startup: Provides Startup DC for Switching Regulator until
Transformer conduction begins
Switching Transformer: Provides voltages to all circuits
Current Feedback: Provides current feedback to Switching IC to stop
conduction.
Run DC: Provides additional DC to Switching IC
Refresh: Provide Refresh voltage to Restart IC Regulation
Main Relay: Allows Power flow to SW IC and SW Reg. Also
functions as relay for Degauss
Main Relay Drive: Controls function of Main Relay
Error Amp: Monitors B1 Line Voltage
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