Minolta Di551 Service Manual page 172

SCANNER SECTION
(5) Install the scanner motor (M11) and the scanner
belt. Tighten the scanner motor loosely with four
screws.
Caution1: Make sure to install the belt in the
middle of two pulleys. Also make
sure that the belt is not placed on the
edges of pulleys, or that it is running
off from the pulleys.
Caution2: Tighten the motor by first tightening
the screw and then give it one turn to
loosen slightly.
Scanner Belt
Pulley
(6) Hook the spring scale on the upper hole of the
scanner motor (M11).
Upper hole
Spring scale
1-C-7
(7) Pull the spring scale upward, and tighten the
scanner motor (M11) tightly with the tension
pressure of 2 ± 0.2 kgf. (Use four screws)
Caution: Make sure that the scanner motor
moves up and down when confirming
the tension pressure.
Spring scale
(8) Make sure that the belt is not slacked off after
marking an adjustment.
(9) Insert the connector to the scanner motor (M11).
(10) Follow the disassembly procedures in reverse
order to install.
Scanner motor (M11)
Screws