Chapter 5: Assembly and Disassembly of Parts
SPD-M20A Service Manual
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5.3 Optical System Unit
CAUTION
The photodiode array (PDA) is extremely sensitive to light. During the operation,
make sure that intense light such as direct sunlight or the flash of a camera does
not impinge upon it.
The surface of M1, M2 and the grating cannot be cleaned. Make sure not to
touch the surface or allow contact with water or dust.
The optical system unit must be adjusted after replacement. When each part is
replaced, temporarily tighten the screws until adjustment is performed.
The optical system unit is fastened from the back of the main unit with screws.
1) Prior to removing the optical system unit, remove the following parts.
・ D2 lamp
・ W lamp
・ Each connector attached to the CPU board
・ Temperature controlled cell connector (see 5.1.4.4 Temperature controlled cell
connector)
・ Temperature controlled cell
2) Remove the ground wire that is connected to the cover of the optical system unit.
Simultaneously, detach the cable on the optical system unit by loosening the cable
band, and move it out of the way.
Bands for the ground and cable on the case cover.
3) Remove the three screws (truss head, M4x15) that attach the optical system unit,
and slowly lift out the optical system unit.
Positions of Optical System Unit Fixing Screws
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