Service manual CP 385 / CP785
- 52 -
On normal run mode, I501 microcontroller pin 63 (power) is set to high
•
So, I810 controlled rectifier is not conducting
- Q809 is conducting. So, Q808 is not conducting and Q807 is conducting
- So, Q807 collector is connected to the ground and I810 controlled rectifier gate pin is
set to low (no conducting)
•
So, current from 11V DC voltage (from T801 SMPS transformer pin 13) does not flow through
Q811 and Q810 transistors but flows through I806 IC error amplifier
- Q809 is conducting. So, Q810 is not conducting and no current flows from Q810
collector to the ground
Therefore, the power supply circuit diagram is the one shown on the next paragraph
* power supply circuit diagram during TV set normal run
I 8 2 0
5 V
R E G U L A T O R
I 8 2 3
3 . 3 V
R E G U L A T O R
1 4 . 5 V ( C P 7 8 5 )
1 2 . 5 V ( C P 3 8 5 )
5 V
3 . 3 V
3
3
1
1
1 1 V
8 V
6 V
1
3
1 4 3 V ( C P 7 8 5 )
1 2 3 V - 1 1 3 V ( C P 3 8 5 )
D 8 2 0
D 8 6 0
D 8 3 0
D 8 3 1
C 8 3 2
C 8 2 3
C 8 6 1
9
1 2
1 3
1 6
2
4
C 8 1 3
R 8 2 3
R 8 1 0
1 1 V
2
3
I 8 0 6
I C E R R O R A M P L I F I E R
1 4 . 5 V
1 2 . 5 V
8 . 5 V
8 V
1 1 . 5 V
1 1 V
1 4 3 V
1 2 3 V / 1 1 3 V
T 8 0 1 S M P S T R A N S F O R M E R
D 8 0 1 . . . D 8 0 4
( G R A E T Z B R I D G E )
D
I 8 0 1
M O S F E T A N D
C O N T R O L I C
S W 8 0 1
P O W E R
S W I T C H
M A I N A C V O L T A G E
L 8 0 1
Ι 8 2 2
8
V
R E G U L A T O R
1
3
Power supply operation during TV set normal run
Summary of Contents for DTA-20 T1
Page 17: ...Service manual CP 385 CP785 16...
Page 21: ...Service manual CP 385 CP785 20...
Page 34: ...Service manual CP 385 CP785 33 5 Circuit description 5 1 Block diagram...
Page 39: ...Service manual CP 385 CP785 38 Chassis block diagram IF...
Page 43: ...Service manual CP 385 CP785 42 Sound signal flow diagram...
Page 70: ...69 Service Manual cp 385 cp 785 7 Exploded View 7 1 DTA 20T1...
Page 73: ...72 7 4 DTA 20T8 Service Manual cp 385 cp 785...
Page 74: ...73 7 5 DTA 21T1 Service Manual cp 385 cp 785...
Page 76: ...75 7 7 DTA 21T5 Service Manual cp 385 cp 785...
Page 77: ...76 7 8 DTA 21T9 Service Manual cp 385 cp 785...
Page 79: ...78 Service Manual cp 385 cp 785 7 10 DTE 25G6...
Page 80: ...79 Service Manual cp 385 cp 785 7 11 DTE 25G7...
Page 82: ...81 7 13 DTE 28G6 Service Manual cp 385 cp 785...
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