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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
Surge Protection:
Stops circuit function if High Current (short) is
detected.
2.
T951, D954-57 and C951
Standby Power:
Supplies Standby DC voltage to Micon
3.
C901, C902 and C903
Line Filter:
Filtering of AC line noise
4.
D901 and C907
Main rectifier:
Provides rectified DC to Switching Regulator and
Switching Transformer.
5.
IC911
Switching Regulator:
Regulates Switching Voltages out of
Transformer
6.
D911, R911,R930 and C914
Startup:
Provides Startup DC for Switching Regulator until
Transformer conduction begins
7.
T921
Switching Transformer:
Provides voltages to all circuits
8.
R912, R913 and R914
Current Feedback:
Provides current feedback to Switching IC to stop
conduction.
9.
R915 and D912
Run DC:
Provides additional DC to Switching IC
10.
D917 and D914
Refresh:
Provide Refresh voltage to Restart IC Regulation
11.
D945 ~ RY951
Main Relay:
Allows Power flow to SW IC and SW Reg. Also
functions as relay for Degauss
12.
Q951
Main Relay Drive:
Controls function of Main Relay
13.
IC921
Error Amp:
Monitors B1 Line Voltage
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
.
