42 Service Navigation2.1. IntroductionThis service manual contains technical information, which allow service personnel’s to understand and service this modelPlease place orders using the parts list and not the drawing reference numbers.If the circuit is changed or modified, the information will be followed by supplement service manual.2.2. Important Notice2.2.1. About LENS MAIN UNIT (Ref. 209)1. LENS MAIN UNIT (Ref. 209) is not supplied due to difficulty of the transportation issue (Fragile, Dust-free packing), andrequires critical lens adjustments.Therefore, any needs of the "LENS MAIN UNIT" (Ref. 209), carefully confirm its performance in advance.2. Once "LENS MAIN UNIT" (Ref. 209) is confirmed as defective, place order "LENS Unit" (Ref. 200) and replace SHADINGFRAME (Ref. 208), to maintain Serial number of owner's original lens.Fig. 1-13. No adjustment is required when replacing the part mentioned on Fig.1-1. But, when tighten the concerned screws,applyproper torque mentioned on "4. Disassembly and Assembly Instruction" section.