Sony UP-895 - Head Operation (up & Down) Is out of Order

5-4
UP-895/(E)
5-4. Head Operation (Up & Down) is Out of Order
IC400 and Q402 on MA-99 board are defective.
NO
YES
Does head motor operate?
START
The head position sensors (PH21 and PH22) on SE-531
board are defective.
NO
YES
Are signals from sensor
available at pins 2 and 3 of CN2
on MA-99 board?
Pins 16 and 17 of IC304 on MA-99 board are defective.