Chapter 4—Maintenance
7.Perform a CRT mechanical focus adjustment (Section 3.7) and yoke alignment (Section 3.2) after yoke replacement.
4.10High Voltage Power Supply (HVPS)
The HVPS is located on the left side of the projector next to the CRT housing assembly.
To remove the HVPS:
1.Unplug the projector. Wait at least a minute before proceeding for the high voltage to bleed off.
2.Run all three (3) CRTs all the way forward using the Z axis focus rods at the rear of the CRT assembly (Photo
3.Remove all three (3) video amplifier boards (refer to Section 4.8 and either Figure
4.Remove the System Power Supply (see Section 4.5).
5.Remove the System Power Supply mounting plate (covers High Voltage Power Supply).
6.Inside the CRT housing on the left side, disconnect all three (3) CRT anode cables from the bulkhead connectors. As an added precaution, short the anode leads to the High Voltage Chassis ground to bleed off any residual charges. Slide the anode wire connectors off their mounting brackets.
7.In the bottom rear of the CRT housing, cut the tie wraps holding the HV, G2, and focus cables.
8.Carefully slide all G2, and focus cables out of the CRT housing.
9.Remove the top connector (power control) at the rear of the HVPS.
10.Loosen and release the five (5) captive screws at the base of the HVPS: Two (2) screws are located forward.
One (1) screw on top. Two (2) screws at the rear.
11.Remove the HVPS.
12.Replace the HVPS in the reverse order.
13.Perform a CRT mechanical focus adjustment, yoke alignment, G2 adjustment, and electronic focus adjustment after HVPS replacement (Sections 3.7, 3.2, 3.10, and 3.8).
NOTE: When replacing the HVPS, ensure that the wires are routed to the proper color and that the wires are neatly placed in the bottom of the CRT housing.
Model 330. 340SC, 370SC Service Manual |
