Power Supply - Sony VTX-D800U Service Manual

5.0: Power supply

The power supply in an integrated part of the Main PWB, and contains the following functional blocks: -
The main components are:-
1. Mains Plug, Lead and input filter
2. Primary and PWM Controller
3. Transformer and outputs
4. Feedback Circuit
5. Post Regulation Circuits.
Input
Filter Primary &
Controller
The output of this power supply can be measured at the following positions on the PWB, and should be within the
tolerances for each of the supply rails (marked on the PWB):-
Label / Rail JL Position
33v
12v
5v
3v3
2v5
1v5
Service Manual
Transformer
Feedback Circuit
Vnom
J1 33
G3 12
J2 5
J3 3.3
F4 2.5
D3 1.5
32.5V Output
21V Output
5V Output
3.3V Output
Vmin
30
11.4
4.75
3.14
2.3
1.43
- 11 -
+12V +5V
Audio
2V5
1V5
Vmax
35
12.6
5.25
3.46
2.7
1.57