Service manual

3.2 SCANNER

The 1st scanner consists of the exposure lamp [A], main [B] and sub [C]

reflectors, and 1st mirror [D]. This model uses a halogen type exposure lamp

with eight elements and a frosted surface. This ensures even exposure

across the main scan in the main scan direction.

The exposure lamp is energized by a dc supply to avoid uneven light

intensity caused by power fluctuations while the 1st scanner moves in the

sub scan direction. The sub reflector is shaped so that light will expose the

original evenly. This reduces shadows on "paste-up" originals.

The 1st [D], 2nd [E], and 3rd [F] mirrors have glass on the reverse sides to

increase their weight. This prevents the mirrors from vibrating.

The thermoswitch [G] in the 1st scanner protects against overheating. The

thermoswitch will open at around 140°C.

NOTE:

The main scan direction refers to the direction the laser light

travels across the drum’s surface when creating the latent image

- the horizontal direction. The sub scan direction refers to the

direction of drum rotation while creating the latent image - the

vertical direction.

[E]

[A]

[G]

[B][D]

[F]

[C]

SCANNER UNIT

A166/A187/A189 2-30 SM

CÓPIA NÃO CONTROLADA