problem-Gross Positioning error c in z axis

[isv10]

Hello.
I'm a new bridgeport interact 2 users.
When i power on machine.It starting and Referenced but after z axis move
it stop and show error "gross position error c " and position on monitor not changed ,but z axis before stop , moves about 5 centimeter.
I changed x and z axis servo but again machine error "gross position error c " after moving z axis.
anybody can help me.

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[steryd]

What control system is it? (smells like heidenhain)
Did U check the easuring elements connection (encoders)?

[isv10]

tnc 151.Yes i change z and x servo encoder and again same error.

[steryd]

Did U replace encoders itself or with motors,
This error may be caused by losening the encoders axis clutch from the screw.
Letter C not necessary means Z axis.