
Theory of Operation
Detailed Circuit Description
4
4-11
•
High Voltage Power Amplifier Assembly (A3)
•
Power amplifier
•
Harness to heat sink and its high voltage power devices
•
Connections to the output transformers
•
High voltage heat sink temperature monitoring circuitry
•
High Voltage Sense Assembly (A6):
•
High voltage sense (attenuator) and calibration circuits
•
5725A input and output switching relays, relay drivers
•
Analog monitor, an 8-bit dac, latch for mux, latch for dac
•
Subminiature D-type connector to the 5700A
•
5700A current routing circuits
•
Guard crossing
•
AC line power selection circuitry
•
AC line inrush current limiting circuitry
Detailed Circuit Description
4-14.
Detailed circuit descriptions for each pca (printed circuit assembly) are provided next.
Individual block diagrams are provided for the Current Amplifier (A2), High Voltage
Amplifier (A3), High Voltage Sense (A6), and Digital (A5) assemblies. You may also
find it helpful to refer to the schematic diagrams (Section 9) while reading theory for
each assembly.
Interconnect Assembly (A1)
4-15.
The Interconnect assembly (A1) links the other five assemblies in the 5725A. The
interconnect assembly contains the following parts:
•
Connectors and traces to interconnect the other assemblies and the fan. There are
three 32-pin DIN connectors on the Interconnect pca which connect the Power
Supply assembly (A4), High Voltage Amplifier assembly (A3), and Current
Amplifier assembly (A2). A 64-pin DIN connector links the Interconnect assembly
to the High Voltage Sense assembly (A6). A 34-pin ribbon cable connector links the
Interconnect assembly to the Digital assembly (A5). Other cable assemblies attached
to the Interconnect assembly go to the fan, High Voltage assembly output, and high
voltage transformers.
•
High voltage transformer secondary-switching circuitry. Three high voltage reed
relays (K013, K014, and K015) select one of three ac voltage output transformers. A
fourth relay (K001) is a high voltage armature type that connects the secondaries of
the low-frequency transformer in either a series or parallel fashion.
The circuit board has four layers. Most connections are done on the inner two layers. One
outer layer is an earth ground plane; the other outer layer is tied to the signal VCOM.
Summary of Contents for 5725A
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Page 36: ...5725A Instruction Manual 2 2...
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Page 46: ...5725A Instruction Manual 3 2...
Page 62: ...5725A Instruction Manual 4 4 Figure 4 1 5725A Overall Block Diagram...
Page 78: ...5725A Instruction Manual 4 20 aq20f eps Figure 4 3 Current Amplifier Assembly Block Diagram...
Page 96: ...5725A Instruction Manual 4 38...
Page 98: ...5725A Instruction Manual 5 2...
Page 100: ...5725A Instruction Manual 5 4...
Page 102: ...5725A Instruction Manual 6 2...
Page 118: ...5725A Instruction Manual 7 2...
Page 126: ...5725A Instruction Manual 7 10...
Page 128: ...5725A Instruction Manual 8 2...
Page 132: ...5725A Instruction Manual 8 6 aq24f tif Figure 8 1 Final Assembly...
Page 133: ...List of Replaceable Parts 8 8 7 aq25f tif Figure 8 1 Final Assembly cont...
Page 134: ...5725A Instruction Manual 8 8 aq26f tif Figure 8 1 Final Assembly cont...
Page 135: ...List of Replaceable Parts 8 8 9 aq27f tif Figure 8 1 Final Assembly cont...
Page 136: ...5725A Instruction Manual 8 10 aq28f tif Figure 8 1 Final Assembly cont...
Page 137: ...List of Replaceable Parts 8 8 11 aq29f tif Figure 8 1 Final Assembly cont...
Page 138: ...5725A Instruction Manual 8 12 aq30f tif Figure 8 1 Final Assembly cont...
Page 139: ...List of Replaceable Parts 8 8 13 aq31f tif Figure 8 1 Final Assembly cont...
Page 141: ...List of Replaceable Parts 8 8 15 5725A 1611 aq36f eps Figure 8 2 A1 Interconnect PCA...
Page 145: ...List of Replaceable Parts 8 8 19 5725A 1650 aq37f eps Figure 8 3 A2 Current Amplifier PCA...
Page 149: ...List of Replaceable Parts 8 8 23 5725A 1661 aq38f eps Figure 8 4 A3 High Voltage Amplifier PCA...
Page 153: ...List of Replaceable Parts 8 8 27 5725A 1631 aq39f eps Figure 8 5 A4 Power Supply PCA...
Page 155: ...List of Replaceable Parts 8 8 29 5725A 1650 aq40f eps Figure 8 6 A5 Digital PCA...
Page 159: ...List of Replaceable Parts 8 8 33 5725A 1601 aq41f eps Figure 8 7 A6 High Voltage Sense PCA...
Page 161: ...List of Replaceable Parts 8 8 35 aq32f tif Figure 8 8 A12 Transformer Enclosure Assembly...
Page 162: ...5725A Instruction Manual 8 36 aq33f tif Figure 8 8 A12 Transformer Enclosure Assembly cont...
Page 163: ...List of Replaceable Parts 8 8 37 aq34f tif Figure 8 8 A12 Transformer Enclosure Assembly cont...
Page 164: ...5725A Instruction Manual 8 38 aq35f tif Figure 8 8 A12 Transformer Enclosure Assembly cont...
Page 166: ...5725A Instruction Manual 8 40...
Page 168: ...5725A Instruction Manual 9 2...
Page 169: ...Schematic Diagrams 9 3 9 Figure 9 1 A1 Interconnect PCA 5725A 1611 aq48f eps...
Page 170: ...5725A Instruction Manual 9 4 Figure 9 1 A1 Interconnect PCA cont...
Page 171: ...Schematic Diagrams 9 5 9 Figure 9 1 A1 Interconnect PCA cont...
Page 172: ...5725A Instruction Manual 9 6 Figure 9 2 A2 Current Amplifier PCA 5725A 1650 aq52f eps...
Page 173: ...Schematic Diagrams 9 7 9 Figure 9 2 A2 Current Amplifier PCA cont...
Page 174: ...5725A Instruction Manual 9 8 Figure 9 2 A2 Current Amplifier PCA cont...
Page 175: ...Schematic Diagrams 9 9 9 Figure 9 2 A2 Current Amplifier PCA cont...
Page 176: ...5725A Instruction Manual 9 10 Figure 9 3 A3 High Voltage Amplifier PCA 5725A 1661 aq56f eps...
Page 177: ...Schematic Diagrams 9 11 9 Figure 9 3 A3 High Voltage Amplifier PCA cont...
Page 178: ...5725A Instruction Manual 9 12 Figure 9 3 A3 High Voltage Amplifier PCA cont...
Page 179: ...Schematic Diagrams 9 13 9 Figure 9 4 A4 Power Supply PCA 5725A 1631 aq59f eps...
Page 180: ...5725A Instruction Manual 9 14 Figure 9 4 A4 Power Supply PCA cont...
Page 181: ...Schematic Diagrams 9 15 9 Figure 9 4 A4 Power Supply PCA cont...
Page 183: ...Schematic Diagrams 9 17 9 Figure 9 5 A5 Digital PCA cont...
Page 185: ...Schematic Diagrams 9 19 9 Figure 9 6 A6 High Voltage Sense PCA cont...
Page 186: ...5725A Instruction Manual 9 20 Figure 9 6 A6 High Voltage Sense PCA cont...
Page 187: ...Schematic Diagrams 9 21 9 Figure 9 6 A6 High Voltage Sense PCA cont...
Page 188: ...5725A Instruction Manual 9 22 Figure 9 6 A6 High Voltage Sense PCA cont...
Page 189: ...Schematic Diagrams 9 9 23 aq45f eps Figure 9 7 A12 Transformer Enclosure Assembly...
Page 190: ...5725A Instruction Manual 9 24...
Page 194: ...5725A Instruction Manual 4...