Introduction; Handling And Cleaning; Handling Pc Boards; Solder Repairs - Keithley 2302 Instruction Manual

15-2 Disassembly

Introduction

This section explains how to handle, clean, and disassemble the Model 2306 — drawings are
located at the end of this section.
WARNING

Handling and cleaning

To avoid contaminating PC board traces with body oil or other foreign matter, avoid touching
the PC board traces while you are repairing the instrument. Some circuit board areas have high-
impedance devices or sensitive circuitry where contamination could cause degraded
performance.

Handling PC boards

Observe the following precautions when handling PC boards:
• Wear cotton gloves.
• Only handle PC boards by the edges and shields.
• Do not touch any board traces or components not associated with repair.
• Do not touch areas adjacent to electrical contacts.
• Use dry nitrogen gas to clean dust off PC boards.

Solder repairs

Observe the following precautions when soldering a circuit board:
• Use an OA-based (organic activated) flux, and take care not to spread the flux to other
• Remove the flux from the work area when you have finished the repair by using pure wa-
• Once you have removed the flux, swab only the repair area with methanol, then blow dry
• After cleaning, allow the board to dry in a 50°C, low-humidity environment for several
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
The procedures in this section are intended only for qualified service personnel.
Disconnect the line cord and all test leads and wires from the instrument before
disassembling the unit.
areas of the circuit board.
ter with clean, foam-tipped swabs or a clean, soft brush.
the board with dry nitrogen gas.
hours.