8 months ago pentaxforums.com member started the thread about Pentax FA*85 1.4 with abnormal AF sound. The link below:
Read more at:
FA*85 1.4 Auto Focus Sound on K-1: Is this normal? - PentaxForums.com
I would like to share my joy about successful replacement of cracked spur gear with the dimensions 13T Spur Gear (Brass), 0.3 MOD, 2mm bore, 2mm thickness from:
https://shop.kkpmo.com/index.php
BIG THANK YOU to HarisF1 for providing very good source to buy the gear. The shippment was done in 1 week from Poland to Lithuania.
I bought metal (brass) and plastic gear. The procedure of the replacement was not difficult, but tricky. In fact the new spur gear is about 0,2 mm toller/higher than original and I shaved it with sandpaper.
You do not have to disassemble the entire focusing gear mechanism. Instead, you should first climb a pinch to the gear's hole and roll it off at least twice so that the axis then enters the same pockets under the strong pressure with fingers or some kind of hard flat tool.
Now the AF sound is normal.
Yahoo!