Sony ZRD-1 Service Manual page 45

3. Remove the four screws, then remove the two fans.
4. To install, reverse the removal procedure.
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When attaching the fans, attach them in the direction as shown in the picture.
ZRD-1/ZRD-2
PSW3 30
Harnesses
Label sides
PSW3 30
Fans
4-5 (E)