ALARMS 945 (SERIAL SPINDLE COMMUNICATION ERRORS)

[hell_pk]

Hi!
We have John ford ST60B machine(Fanuc 0-TC) with following error on startup:

945 : A communication error occurred in the first serial spindle.
Power supply module(A06B-6087-H130) in electrical cabinet displays alarm code:02


the manual describes the causes as:

A poor connection between a memory printed–circuit board and the serial
spindle amplifier may occur .

 The memory printed–circuit board is defective.
 The cable between the memory printed–circuit board and optical I/O
link adapter has a broken wire or is unhooked.
 The optical I/O link adapter is defective.
 The fiber optics cable has a broken wire or is unhooked.
 The serial spindle amplifier is defective.

We have another machine ST-60A So I can easily verify I/o link adapter and cables from other machine.they are OK. Now should I go for memory card first or the spindle amplifier module as both require some time.Which in general will most probably be the culprit.
Spindle amp. module is: A06B-6102-H226#H520
Mem module: A16B-2201-0101/09A

[hell_pk]

Hi all!
Power supply module(A06B-6087-H130) in electrical cabinet displays alarm code:02( cooling fan for control circuit not working).
What fan is this alarm indicating? Fan on upper side of
PSM seem to be working fine and I have have changed the PSM as well.
Please advice?