Yokogawa µR20000 - Manual (Page 76)

7-1 SM 04P02B01-01E
Replacing Parts
7
Chapter 7 Replacing Parts
7.1 Before Replacing Parts
Notes When Replacing Parts
• Replacement of parts can only be performed by properly trained personnel.
• This section describes disassembly of the instrument. Refer to the disassembly
procedures when reassembling.
• If parts other than the chart paper, pens, ribbon cassette, and internal light LED are
replaced, the instrument is no longer warranted by YOKOGAWA.
WARNING
Remove all wires and cables from the recorder and turn OFF the power switch
before attempting any disassembly or assembly. Certain parts of the recorder
carry high voltages.
CAUTION
• The internal circuitry is vulnerable to damage from static electricity. Take
appropriate measures to ensure that static electricity does not flow to the
internal circuits.
• Plastic molded framing with latches are used to secure components. Applying
excessive force to latches can cause them to break.
Testing after Replacement of Parts
When replacing the parts other than the chart paper, pens, ribbon cassette, and internal
light LED, be sure to check them by performing the insulation resistance test, withstand
voltage test, and protective grounding function (see chapter 3).
Torque Driver and Tightening Torque
Torque Driver
The recorder uses M2.3, M3, and M4 + screws. Use the appropriate screw driver for
each type of screw.
Screw Tightening Torque
• Tighten screws with the torque below unless a different torque is specified in a
particular instruction. In that case, use the specified torque instead.
Screw Diameter Tightening Torque Bit No.
M2.3 0.17 to 0.23 N·m #1
M3 0.59 to 0.69 N·m #2
M4 1.37 to 1.47 N·m #2
• The screw tightening torque for the Input Terminal Assembly, Option Terminal
Assembly, and Mother Board Assembly is 0.39 to 0.49 N·m.