Kowa K9L48B, Service Manual, Page: 22 / 60

GG-09001 Edition 1.3
- ２２ -
⑦
Disengage the sections attached by the upper sponge (K9L45 #551).
⑧
Undo 2 screws and disassemble the upper segment.
⑨
Undo 2 screws and remove the remaining fan (
*K9L45-5087
).
⑩
Install a new replacement part(s) in the reverse order of the removing procedure. Carefully
read the precautions shown below before reassembling the unit. Since reassembling the fan
unit of the optical head unit is very complicated, refer to the figures
①
to
⑨
and the
assembly drawing shown on the next page when reassembling the fan unit.
Reconnect all cables at the original positions and tie them with tying bands.
For the cable connecting positions, refer to
②
.
Precautions for part replacement
・
Each fan has a certain direction of airflow. Install a fan in the correct airflow direction.
An arrow shown on a fan indicates the airflow direction.
・
Fine-shuts (K9L39 #600) are very important parts. If no fine-shut is used, exhaust flow
rate will change and cause heat retention within the optical head unit. Used fine-shuts
must be replaced with new fine-shuts.
・
Also replace worn sponges
（
K9L45 #551
）
with new sponges. If no sponge is used,
exhaust flow rate will change and cause heat retention within the optical head unit.