Read Sharp 76FW-53H (serv.man13) Service Manual online
Colour Television – DA100/DW100 Chassis
Sharp Electronics (UK) Ltd
Technical Support
September 99
Page 5
5
V
R
EGULATOR
This is another new circuit, but depending on whether you are dealing with the DA100 (4:3) chassis or
DW100 (16:9) chassis will determine the exact circuit.
DW100 (16:9) chassis will determine the exact circuit.
DA100 (59ESD7H
AND
66ESD7H) 4:3
CHASSIS
The FET Q704 is a series regulator producing 5v, which is controlled by Q713. A voltage is fed-back
from the output of Q704 (junction of L705 and C723) which will control the conduction of a variable
zener diode (IC707). D723, Q705 and Q706 provide protection against excessive supply voltage.
from the output of Q704 (junction of L705 and C723) which will control the conduction of a variable
zener diode (IC707). D723, Q705 and Q706 provide protection against excessive supply voltage.
D722
D714
IC707
D723
2v7
2v7
Q705
Q706
Q704
+5v
+16v
From T701
pin 1
pin 1
Q713
L705
C723
2200
2200
C734
470
470
C721
470
470
R760
4k7
4k7
R729
4k7
4k7
R757
2k2
2k2
R726
22
22
R706
8k2
8k2
R710
2k2
2k2
R707
1k5
1k5
R725
10k
10k
C722
10nF
10nF
C735
150pF
150pF
R731
10k
10k
R756
10k
10k
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