Hitachi 51F510, Manual

Page: 9 / 152

DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
PAGE 01-03
(Continued from page 2)
See the DP-4X Signal Power Supply Shutdown Circuit for details.
These shutdown circuits are defeated because the SW (Switched) power supplies are turned off in standby. So to prevent
faults triggering of the shutdown circuit, the sensing circuits are turned off also..
Q206 generates the shutdown high signal if any of the shutdown circuits attached to its base become low. Q206 requires emit-
ter voltage to operated. RY05 supplies the 5.7V to the Emitter of Q206 . This voltage must be active for Q206 to function.
When the set is turned off, RY05 opens and the 5.7V disappears so Q206 can no longer operate.
SHUTDOWN INPUTS EXPLAINED:
GENERAL INFORMATION CONTINUED:
(See previous two pages for generic shutdown circuit details) :
All of the Power Supply Shutdown circuitry can be broken down into the following categories;
•
Voltage Missing Detection or Short Detection or Negative Voltage Loss Detection
•
Voltage Too High Detection
•
Excessive Current Detection
COLD GROUND SIDE SHUTDOWN SENSING CIRCUITS.
(AC must be removed to recover).
All shutdown events arrive at the base of
Q203 . The shutdown events are categorized in the following pages.
The shutdown circuit are broken down into four pages. The shutdown outputs from each page are interconnected and indi-
cated by symbols shown below;
A
Please refer to the following Diagrams as you continue to read the following explanations.
1.
The DP-4X Deflection Side Shutdown Diagram for (A), (B), (C), (D).
2.
The DP-4X PROT_OVP and PROT_OCP Shutdown Diagram for (A), (B), (E), (F).
3.
The DP-4X Deflection Power Supply Shutdown Output Circuit Diagram for (C), (D).
4.
The DP-4X Signal Power Supply Shutdown Circuit for (E), (F).
B C D E F