7.5.2 Carriage Assembly Replacement
This procedure assumes that the Carriage Assembly was removed in Section 7.5.1.
CAUTION
Recalibrate the TLS after replacing the Carriage Assembly.
Be very careful not to damage the Vertical Axis Home Sensor while installing the
Carriage Assembly. There is very little clearance between the sensor (underneath
and to the rear of the Carriage Assembly) and the Vertical (Y) Axis Home Sensor
Probe, which is mounted on the floor of the cabinet (Figure 7-3).
1.
Locate both Guide Shafts. The Guide Shafts are identical. Note that the top end
of each Guide Shaft has a white spacer applied to it, while the bottom end of
each Guide Shaft is bare metal.
2.
Place the orange rubber bushing (removed in Section 7.5.1) over the front Guide
Shaft hole in the bottom plate.
3.
Insert the bottom end of one Guide Shaft (the end without the white spacer) into
the front Guide Shaft hole in the top plate (Figure 7-3), then gently lower the
Guide Shaft down through the hole. This is best accomplished by resting the
hand holding the shaft on the top plate, and then guiding the shaft from inside
the TLS with the other hand.
4.
Hold the front Guide Shaft about 10 inches above the bottom plate with the left
hand. Insert the Carriage Assembly into the cabinet and slide the Front Guide
Shaft Bearing over the Front Guide Shaft. Lower the Front Guide Shaft down
through the orange rubber bushing and into the hole in the bottom plate.
NOTE
In the next step a small mirror may be helpful to view the hole in the Carriage PCBA as it ap-
proaches the Vertical (Y) Axis Home Sensor Probe.
5.
Slowly lower the Carriage Assembly, while using a gentle rocking motion, until
the Vertical (Y) Axis Home Sensor Probe (Figure 7-3) fits into the hole in the
Carriage PCBA, and the Carriage Assembly rests on the orange rubber bushing
on the bottom plate.
6.
Insert the bottom end of the other Guide Shaft (the end without the white
spacer) into the rear Guide Shaft hole in the top plate, then gently lower the
Rear Guide Shaft down through the hole. This is best accomplished by resting
the hand holding the shaft on the top plate, and then guiding the shaft from in-
side the TLS with the other hand.
7.
Lower the Rear Guide Shaft down through the Rear Guide Shaft bearing in the
Carriage Assembly (Figure 7-3) and into the hole in the bottom plate.
501380 Rev. B
Field–Replaceable Units (FRUs)
7-11
