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CHAPTER 6. POWER SUPPLY UNIT
1. General
This power unit is used for UP-5700. The AC input voltage is AC90
~
138V. The safety standard conforms to Electrical regulations
UL1950.CSA950.SS-J. The outputs are +5V, +12V, and –12V.
The other functions include ACL signal, PHSNS signal, PHOLD signal, overvoltage protection against power abnormality, and overcurrent protection
which protects the power from an overload.
2. Block diagram
PHSNS
+5V
+12V
GND
-12V
GND
ACL
RLY1
PHOLD
GND
Regulator
Regulator
N/F
section
PHSNS
Detector section
Convertor section
Output monitor
Overvoltage protection
PHOLD circuit
Rectifying
section
Temperature
protection
Rectifying
section
Control
section
Rectifying
section
Rectifying
section
Rectifying
section
Power of
detection
6 – 1
Summary of Contents for UP-5700
Page 139: ...1 UP 5700 Main PWB CHAPTER 10 PWB LAYOUT A side 10 1 ...
Page 140: ...2 UP 5700 CPU PWB A side UP 5700 CPU PWB B side 10 2 ...
Page 141: ...3 UP 5700 KEY I F PWB A side CN2 UP 5700 KEY I F PWB B side 10 3 ...
Page 144: ...For components produced in January 1998 and onward Parts side Solder side 10 6 ...
Page 145: ...7 2 Sub PWB Side A Side B 10 7 ...