Roland r200 speed error (172 and 97)

There speed error pls help

 

Hi sir:

CHECK FOR # 97;
Error messages on the delivery operation unit

Speed error RTR n
Speed monitoring system of the Real-Time computer is activated.
Monitoring via tacho
n = 1 Standstill monitoring with opened guard is activated
n = 2 Preset speed monitoring with opened guard is activated
n = 3 Standstill monitoring with closed guard is activated
n = 4 Preset speed monitoring with closed guard is activated
Monitoring via angle encoder
n = 5 Standstill monitoring with opened guard is activated
n = 6 Preset speed monitoring with opened guard is activated
n = 7 Standstill monitoring with closed guard is activated
n = 8 Preset speed monitoring with closed guard is activated

Fix it this and the error # 172 will be disappear.

 

That means
Standstill monitoring with open guard activated
Or
Standstill monitoring with closed guard activated

now how can we fixed ???

 

How to deactivated this monitoring ?

 

n = 7 Standstill monitoring with closed guard is activated.

 

Now what should I do? Please advise.

 

Machine stays

 

Follow steps Diagnosis.

Status fix it, the stop guard.

Blessings

 

Where guard located because I checked all guards
As per drawing

 

Guard, read carefully schematic electrical: are Stop switch+ safety switch.

Blessings