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5 220A
Instruction Manual
4-16
4-39. Resistors R11 and R12
Resistors R11 and R12 are associated with the Input Offset Adjustment procedure and the
setting of the ZERO ADJ potentiometer R6. Use the following procedure to select the
proper replacements for R11 and R12:
1.
Disconnect the 5220A from line power.
2.
Remove the top and large inner covers from the unit.
3.
Remove the two fuses (F1 and F2) from the A3 Cap Bus PCB Assembly.
4.
Mount the A5 Preamplifier PCB Assembly on the extender board and install jumper
wires on the PCB at the following points:
a. TP1 to TP5
b. TP3 to TP4
c. Short across R11
d. Short across R12
5.
Disconnect the red and black Current Shunt sense lead from the motherboard
(connections are located near the A5 Preamplifier connector). On A8 the Analog
Control, short TP9 to TP13 to prevent a false overcurrent trip.
6.
Set the digital voltmeter to the 100 mV dc range and connect its input to TP4(+) and
TP5(-) on the A5 Preamplifier PCB Assembly.
7.
Adjust R6 on the A5 Preamplifier to the full ccw (counterclockwise) position.
8.
Connect the 5220A to line power and set the POWER switch to ON.
9.
Select the operate mode using the STDBY/OPR switch.
10.
Note the DVM reading. It should read within the range of +/-1.300 mV dc.
11.
Adjust R6 on the A5 Preamplifier PCB to the full cw (clockwise) position and note
the reading. The DVM reading should increase in a positive direction.
12.
Calculate the difference between the DVM readings taken in steps 10 and 11. The
difference should be 350
µ
V +/- 70
µ
V dc.
13.
Determine the average reading of steps 10 and 11 and adjust R6 for that reading on
the DVM. Then perform step a, b, or c as required:
a. If the DVM reading is within the range of +/-0.087 mV dc, replace both R11 and
R12 with shorting wires (0
Ω
).
b. If the DVM reading is negative, refer to Table 4-4, and replace R12 with the
appropriate resistor. Replace R11 with a shorting wire.
c. If the DVM reading is positive, refer to Table 4-4 and replace R11 with the
appropriate resistor. Replace R12 with a shorting wire.
14.
Set the POWER switch to OFF and disconnect the 5220A from line power.
15.
Install the two fuses (F1 and F2) on the A3 Cap Bus PCB Assembly.
16.
Remove the jumpers from TP1-TP5 and TP3-TP4.
17.
Disconnect the DVM from TP4 and TP5.
18.
Remove the A5 Preamplifier PCB from the extender board.
19.
Reconnect the red and black current shunt sense leads to the motherboard.
20.
Install the A5 Preamplifier PCB Assembly in its slot.
21.
Perform the Calibration Adjustment procedures.
Содержание 5220A
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Страница 11: ...Contents continued ix...
Страница 12: ...5220A Instruction Manual x ajs36f eps 5220A Transconductance Amplifier...
Страница 17: ...Introduction and Specifications Specifications 1 1 5 ajs01f wmf Figure1 1 Outline Drawings...
Страница 18: ...5 220A Instruction Manual 1 6...
Страница 21: ...Operating Instructions Operating Features 2 2 3 ajs02f wmf Figure 2 1 Controls Indicators and Connectors...
Страница 26: ...5 220A Instruction Manual 2 8 ajs03f wmf Figure 2 2 Maximum Load Inductance vs Frequency...
Страница 30: ...5 220A Instruction Manual 3 2 ajs05f wmf Figure 3 1 5220A Functional Block Diagram...
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Страница 65: ...Maintenance Troubleshooting 4 4 19 ajs17f wmf Figure 4 3 Test Point Location Identification...
Страница 70: ...5 220A Instruction Manual 4 24 ajs19f wmf Figure 4 5 Flowchart Summary of Analog Section Troubleshooting Guide...
Страница 80: ...5 220A Instruction Manual 5 8 ajs20f wmf Figure 5 1 5220A Final Assembly...
Страница 81: ...List of Replaceable Parts Service Centers 5 5 9 ajs21f wmf Figure 5 1 5220A Final Assembly cont...
Страница 82: ...5 220A Instruction Manual 5 10 ajs22f wmf Figure 5 1 5220A Final Assembly cont...
Страница 83: ...List of Replaceable Parts Service Centers 5 5 11 ajs23f wmf Figure 5 1 5220A Final Assembly cont...
Страница 84: ...5 220A Instruction Manual 5 12 ajs24f wmf Figure 5 1 5220A Final Assembly cont...
Страница 85: ...List of Replaceable Parts Service Centers 5 5 13 ajs25f wmf Figure 5 1 5220A Final Assembly cont...
Страница 86: ...5 220A Instruction Manual 5 14 ajs26f wmf Figure 5 1 5220A Final Assembly cont...
Страница 87: ...List of Replaceable Parts Service Centers 5 5 15 ajs27f wmf Figure 5 1 5220A Final Assembly cont...
Страница 88: ...5 220A Instruction Manual 5 16 ajs28f wmf Figure 5 1 5220A Final Assembly cont...
Страница 92: ...5 220A Instruction Manual 5 20 ajs38f wmf Figure 5 4 A3 Capacitor Bus PCB Assembly...
Страница 94: ...5 220A Instruction Manual 5 22 ajs39f wmf Figure 5 5 A4 Regulator PCB Assembly...
Страница 97: ...List of Replaceable Parts Service Centers 5 5 25 ajs40f wmf Figure 5 6 A5 Preamplifier PCB Assembly...
Страница 101: ...List of Replaceable Parts Service Centers 5 5 29 ajs42f wmf Figure 5 8 A7 Output PCB Assembly...
Страница 102: ...5 220A Instruction Manual 5 30 ajs43f wmf Figure 5 8 A7 Output PCB Assembly cont...
Страница 104: ...5 220A Instruction Manual 5 32 ajs44f wmf Figure 5 9 A8 Analog Control PCB Assembly...
Страница 107: ...List of Replaceable Parts Service Centers 5 5 35 ajs30f wmf Figure 5 11 A10 Logic PCB Assembly...
Страница 109: ...List of Replaceable Parts Service Centers 5 5 37 ajs31f wmf Figure 5 12 A11 MIS Bus PCB Assembly...
Страница 111: ...List of Replaceable Parts Service Centers 5 5 39 ajs32f wmf Figure 5 13 A12 Shunt Assembly...
Страница 114: ...5 220A Instruction Manual 5 42...
Страница 116: ...5 220A Instruction Manual 6 2 ajs45f wmf Figure 6 1 Rack Mounting Kit...
Страница 118: ...5 220A Instruction Manual 6 4 ajs46f wmf Figure 6 2 Rack Slide Kit...
Страница 119: ...7 1 Chapter 7 Schematic Diagrams...
Страница 120: ...5220A Instruction Manual 7 2 5220A 1001 Sheet 1 of 2 ajs47f wmf Figure 7 1 Interconnect Diagram...
Страница 121: ...Schematic Diagrams 7 7 3 ajs48f wm Figure 7 1 Interconnect Diagram cont...
Страница 122: ...5220A Instruction Manual 7 4 ajs49f wmf Figure 7 2 Chassis Wiring...
Страница 123: ...Schematic Diagrams 7 7 5 ajs50f wmf Figure 7 2 Chassis Wiring cont...
Страница 124: ...5220A Instruction Manual 7 6 ajs51f wmf Figure 7 3 Power Supply...
Страница 125: ...Schematic Diagrams 7 7 7 ajs52f wmf Figure 7 3 Power Supply cont...
Страница 126: ...5220A Instruction Manual 7 8 ajs53f wmf Figure 7 4 A5 Preamplifier PCB Assembly...
Страница 127: ...Schematic Diagrams 7 7 9 ajs54f wmf Figure 7 4 A5 Preamplifier PCB Assembly cont...
Страница 128: ...5220A Instruction Manual 7 10 ajs55f wmf Figure 7 5 A6 Driver and A7 Output PCB Assemblies...
Страница 129: ...Schematic Diagrams 7 7 11 ajs56f wmf Figure 7 5 A6 Driver and A7 Output PCB Assemblies cont...
Страница 130: ...5220A Instruction Manual 7 12 ajs57f wmf Figure 7 6 A8 Analog Control PCB Assembly...
Страница 131: ...Schematic Diagrams 7 7 13 ajs58f wmf Figure 7 6 A8 Analog Control PCB Assembly cont...
Страница 132: ...5220A Instruction Manual 7 14 ajs59f wmf Figure 7 7 A9 Front Panel PCB Assembly...
Страница 133: ...Schematic Diagrams 7 7 15 ajs60f wmf Figure 7 7 A9 Front Panel PCB Assembly cont...
Страница 134: ...5220A Instruction Manual 7 16 ajs61f wmf Figure 7 8 A10 Logic PCB Assembly...
Страница 135: ...Schematic Diagrams 7 7 17 ajs62f wmf Figure 7 8 A10 Logic PCB Assembly cont...
Страница 136: ...5220A Instruction Manual 7 18 ajs63f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly...
Страница 137: ...Schematic Diagrams 7 7 19 ajs64f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly cont...
Страница 138: ...5220A Instruction Manual 7 20...