MODEL 3711/3731 SERVICE/CALIBRATION MANUAL Cat. #2117.60/2117.61
v3 – 03/02 - 9 -
TAKING THE INSTRUMENT APART
• The set of jaws are a mated pair and must remain this way. Repair only one probe at a time to
ensure that jaws are not mixed with another pair.
• Always disconnect the battery before any disassembly of the board is attempted.
• Be sure that the opening of the jaws are perfectly clean. A small amount of foreign matter on the
surface of the jaws can bring the probe out of accuracy.
Necessary tools :
• Phillips screwdriver No. 1
• Standard flat screwdriver
• Jewelers screwdriver or pointed tweezers
• Torx screwdriver {No. 10}
• 25 W soldering iron
DISASSEMBLY PROCEDURE:
• Remove the two screws (V1 and V2) from the back cover and pull to remove it from the rest of the
instrument.
• Disconnect and remove the battery.
• Remove the springs (R1 and R2) from the jaw assembly and trigger. The jaw assembly spring (R2)
can be removed by wedging tweezers between the jaw and the holding pin and lifting it out of
position.
• Remove the jaw screws (V3, V8, and V9) and the lower board screws (V4 and V5).
• Carefully lift the board and jaw assemblies out of the case.
• Carefully disconnect the two jaw connectors (J1 and J2) from the generator board using the tweezers
or jewelers screwdriver to pry them out.
• Remove the jaws by sliding them over the shield. Keep the jaws as a pair.
• Desolder the solder joint attaching the shield to the board and the two wires from the beeper
(use caution to avoid melting the case).
• Open the shield and remove the board mounting screws (V10) on the top of the generator board and
the bottom of the main board and the screw near the battery holder (V6).
• Disconnect the connector (J3) from the power supply board and remove the generator board and the
shield.
• Remove the screw (V7) on the power supply board and unplug from its socket (J6).
• Remove the remaining four screws (V11 to V14) from the battery holder and LCD display holder.
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