Removal and Replacement Procedures For 3739A
7-6 A1 Bias Control PCB Assembly – ND73163<R>
VectorStar ME7838 Series MM
PN: 10410-00306 Rev. F
7-13
Replacement Procedure
Common Disassembly Procedures
1.
Power down the VNA and Test Set and disconnect the cables between the VNA, Test Set, and Modules.
Move the Test Set to the repair area.
•
See
“Disassembly Procedure – Power, Disconnect, and Covers” on page 7-1
above.
2.
Remove the top cover as described in the procedure above.
Disconnect Attached Cable Harnesses
3.
Disconnect all cables attached to the A1 PCB.
4.
Leave the other ends of the cables attached to their destination connectors.
5.
below for a list of all A1 PCB Cable Connections.
Remove and Replace the A1 PCB
6.
Undo and remove the ten (10) pan head Phillips M3 × 8 mm screws holding the PCB to the chassis
standoffs.
7.
Lift the A1 PCB out of the chassis and set aside.
8.
Place the replacement A1 PCB into the chassis, two large J2 and J3 connectors towards the Front Panel.
9.
Loosely insert the ten pan head screws and make sure the PCB is correctly positioned, and then tighten
the screws.
10.
Reconnect the cable harnesses to the A1 PCB as listed in
E17 – Test Point
E18 – Test Point
E19 – Test Point
E20 – Test Point
J2 – To Front Panel, Port 1 Power/Signal.
J3 – To Front Panel, Port 2 Power/Signal.
J4 – To Rear Panel, External Analog Out BNC
Connector.
J5 – To Rear Panel, External ALC Out BNC Connector.
P1 – To A100 LO Amplifier Module, Port 1 LO.
P2 – To A105 LO Amplifier Module, Port 2, LO.
P3 – To A103 RF Amplifier Module, Port 1, RF.
P4 – To Power Supply Cable Harness
P5 – To A104 SPDT Switch Module
P6 – To Rear Panel, External I/O Connector
P7 – To Front Panel, Power LED Cable Harness
P8 – To Power Supply Load Resistors
P9 – To Rear Panel Fan Assembly
P10 – To A101 Modulator Module, Port 1.
P11 – To A106 Modulator Module, Port 2.
P12 – To Front Panel Port 2 LED
P13 – To Front Panel Port 1 LED
P14 – To Power Supply Load Resistors
TP1 – Test Point
Figure 7-5.
A1 Bias Control PCB Assembly – ND73163 – 3-72143-3 (2 of 2)
Summary of Contents for VectorStar ME7838 Series
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