Chapter 4—Maintenance
3.Ensure that all control cables are disconnected from the back of the cardcage then tilt the card cage back to expose the inside of the CRT housing.
4.Unplug and label the five cables connected to the VAB.
5.Unplug and remove the VAB from the back of the CRT.
CAUTION! The connector pins on the CRTs are easily damaged. If damaged, the CRT must be replaced and will not be covered by warranty. Use extreme care when taking the VAB out of the CRT housing to avoid damage to the CRT connector pins. In some cases, it may be necessary to move the CRT all the way forward (Z axis focus rod, rear of CRT
6.Perform the above steps in the reverse order to replace the VAB.
7.Perform a CRT Mechanical Focus adjustment (Section 3.7) after replacing the VAB.
4.9CRT Yoke
The CRT yoke is located on the CRT neck and is supported by the CRT. There is one (1) yoke for each CRT.
To remove the CRT yoke (see Figure 4-9 or Figure 4-10):
1.Unplug the projector. Wait at least one (1) minute before proceeding for the high voltage to bleed off.
2.Run the CRT all the way forward (Z axis focus rod, rear of CRT assembly).
3.Remove the video amplifier board (see Section 4.8).
4.Loosen the yoke clamp and ensure the yoke is loose on the CRT neck.
5.Disconnect the yoke cable connector. Slide the yoke assembly off the rear of the CRT.
CAUTION! The connector pins on the CRTs are easily damaged. If damaged, the CRT must be replaced and will not be covered by warranty. Use extreme care when taking the yoke out of the CRT housing to avoid damage to the CRT connector pins. In some cases it may be necessary to use the two other mechanical focus adjustment rods to tilt the CRT to allow the yoke to be removed from the CRT neck.
6.Perform the above steps in the reverse order to replace the yoke assembly.
Model 330, 340SC, and 370SC Service Manual |
