Sony HCD-EP707 Service Manual page 49

5 When bevel gear is turned anti clockwise, the upper pinion will in also turn 5 times.
When the upper pinion turns, it will transport the upper carriage out from its original position.
When the upper carriage moves to it's max position (upper pinion turns 5 times) the lower carriage will drop down next.
Carriage up/down is controlled by this part called star gear.
From here, the upper carriage can be taken out. Method as shown below in the picture.
star gear
6 Next to take out the lower carriage. The bevel gear is turned anti clockwise.
The lower pinion will turn 5 times. After turning the front star gear will turn slightly.
After finishing, next the upper pinion will turn 5 times.
While it turns, it will transport the lower carriage out to its max position.
From there, the carriage is taken out the same way as how the upper carriage is taken out.
lower carriage
lower carriage
– back view –
bevel gear
upper pinion
drawer
HCD-EP707
drawer
star gear
3