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D-1
1. PRECAUTIONS FOR DISASSEMBLY/ADJUST-
MENTS
1-1. Parts That Must Not be Touched
(1) Red-Painted Screws
Purpose of the Red Paint
Red-painted screws show that the assembly or unit secured can be adjusted or set only at
the factory and should not be readjusted, set, or removed in the field.
If it becomes unavoidably necessary to disassemble any of these assemblies and units,
disassembly may be done provided that the conditions permitting reassembly are met.
Note also that when two or more screws are used on the part in question, only one repre-
sentative screw may be marked with red paint.
(2) Variable Resistors on Boards
Do not turn the variable resistors on boards for which no adjusting instructions are given in
ADJUSTMENT.
(3) Other Screws not Marked with Red Paint
PH Unit
4558F2C516DA