Ricoh D197 Service Manual page 243

Anti-Condensation Heater Type M12
23. Remove the rear scale [A] ( ×3).
24. Remove the left scale and exposure glass [A].

The exposure glass and the left scale are attached with double-sided tape.
25. Move the carriage to the center.
26. Attach the bracket [A] to the left side of the scanner.
SM 2-173 D197/D198/D199/D200/D201/D202