Mainframe Replacement Parts; Replacement Precautions; Soldering Considerations - Keithley S46 Instruction Manual

S46/S46T Microwave Switch System Instruction Manual
Relay replacement
WARNING
WARNING

Mainframe replacement parts

Replacement parts for the mainframe can be obtained directly from Keithley Instruments,
Inc. See the parts list in
WARNING

Replacement precautions

CAUTION

Soldering considerations

When using solder on the circuit board, observe the following precautions:
•
•
•
Relay replacement should be performed by qualified service personnel
only. Do not perform this procedure unless you are qualified to do so.
Before replacing a relay, turn off the power and disconnect the power
line cord from the unit. Remove any signal connections from all relays.
Section 5
Use only the parts specified in Section 5 of this manual when servicing
the equipment. Use of improper parts may expose the operator to
hazardous voltages that could result in personal injury or death. Do
not attempt to replace parts or otherwise service the equipment unless
you are qualified to do so.
Observe the following precautions when replacing components:
• To avoid contamination which could degrade switch performance,
always handle the switch only by the covers and side edges. Do not
touch the connector, board surfaces, or components on the switch.
• Use care when removing components from the PC board to avoid
pulling traces away from the circuit board. Before attempting to
remove a relay, use an appropriate de-soldering tool to clear each
mounting hole completely free of solder.
Use SAC Tin/Silver/Copper on lead free PC boards which are identified with a
"Lead Free" label. Use Tin/Lead solder on non-lead free boards.
Use an OA-based (organic activated) flux, and take care not to spread the flux to
other areas of the circuit board.
Remove the flux from the work areas when the repair has been completed. Use
pure water along with clean cotton swabs or a clean soft brush to remove the flux.
for part numbers.
Service Information
S46-901-01 Rev. C / January 2006
4-7