Hughes-JVC Technology Corporation 2310 Camino Vida Roble Carlsbad, CA.
102802 First Edition 102802 Rev A 102802 Rev B July 1994 December 1994 August 1995 Confidential and proprietary information. © Copyright 1994 by Hughes-JVC Technology Corporation. All worldwide rights reserved. No part of this manual may be reproduced in any form without the express written permission of Hughes-JVC Technology Corporation. The contents of this Supplement may be revised without prior notice. ILA™ is a trademark of Hughes-JVC Technology Corporation.
Table of Contents General Information ................................................................................4 1.0 Safety Precautions...........................................................................4 2.0 External Arc Lamp Power Supply ....................................................6 3.0 Brightness Level Checks..................................................................7 4.0 Electronics Module Removal and Replacement ..............................11 5.
General Information The Series 300 Operator’s Manual and Service Manual provide information on installation, checkout and maintenance for all Series 300 projectors including the Model 335. There are some distinct areas with reference to the Model 335, mainly due to the larger Xenon Arc Lamp, that require additional information and procedures. Focusing on these distinct areas and special procedures is the purpose of this supplement. The areas discussed in this supplement are: 1.
WARNING!!! The Squirrel Cage (see BLOWER in Figure 1) Blower located next to the Xenon Arc Lamp Assembly is not covered by a grill. Use extreme caution near this blower when performing any adjustments or maintenance that require the projector cover to be off with power on. WARNING!!! High voltage exists on the Ignitor Board Assembly at the front, left of the projector. Be careful when reaching over this area when the Arc Lamp is operating. Wear proper safety clothing to avoid shock hazard.
2.0 External Arc Lamp Power Supply NOTE: This section applies only to those Model 335 projectors that use the external power supply. Projectors with serial numbers 351100 or higher do not require the external power supply. Refer to the Series 300 Service Manual for these units. CAUTION!!! The external power supply can be placed on its side in the upright position or laid flat on its back surface. Working with this power supply in the upright position is a personal safety hazard.
CAUTION!!! If the 16 amp, 600 volt fuse becomes defective and must be replaced, use an exact replacement and, to avoid possible electric shock, wait at least 15 minutes after turning power off (for discharging) before replacing the fuse. CAUTION!!! ALLOW ADEQUATE CLEARANCE! The fan inside the External Arc Lamp Power Supply helps keep the unit cool. Be sure to allow at least six inches of clearance on both sides to prevent overheating of the unit. 3.
WARNING!!! The Squirrel Cage blower (see Figure 1), next to the Arc Lamp Assembly, is not covered by a grill. Use extreme caution near this blower when performing any adjustments or maintenance that require the projector cover to be removed with power on. WARNING!!!High voltage exists on the Ignitor Board Assembly at the front, left of the projector. Be careful when reaching over this area when the Arc Lamp is operating. Wear proper safety clothing to avoid shock hazard.
Figure 1. Model 335 Xenon Arc Lamp Housing Assembly (Lamphouse) 3. Verify that the condensing (collimating) lens assembly has not moved (see Figure 2-2 in the Series 300 Operator’s Manual). Check to see if the assembly is loose. It should be unmovable in any direction. The barrel of the lens assembly should be no more than 1 1/2 inches (usually much closer) from the blue dichroic mirror.
WARNING!!! High voltages exist inside the External Arc Lamp Power Supply. Remove only the small plastic access cover to adjust the lamp current when necessary. No other access covers or panels should be removed by anyone other than an authorized Strong International dealer. There are no user serviceable components in this unit. 4. Verify that the power supply current is set high enough. The current to the lamp is factory-set at 90 amps.
6. If none of the previous procedures cure the problem of low brightness, it may be time to replace the Xenon Arc Lamp. Low brightness could be caused by a lamp with over 1200 hours of use or one that has been turned on and off many times. If either of these is the case, the Lamphouse Assembly must be returned to be relamped. Do not remove the Xenon Arc Lamp from the lamphouse-return the entire unit. 7. Verify that the cold mirror, condensing lens, and UV filter are all free from stains and cracks. 8.
6. On the right side of the System Power Supply, at the input power terminal block, mark and detach the three wires supplying power to the arc lamp housing’s squirrel cage blower. (Be sure to label the three wires carefully so they can be reconnected correctly.) Move that cable out of the way. 7. Back all CRTs into the CRT assembly by turning the focus rod screws, at the rear of the CRT assembly (see Figure 6-4 in the Series 300 Operator’s Manual) all the way to the stops.
5.0 Lamphouse/Ignitor Removal and Replacement 5.1 Lamphouse The Xenon Arc Lamp Lamphouse must be removed as a complete unit. Do not remove the arc lamp separately! To remove the Xenon Arc Lamp Lamphouse: 1. Turn power off and unplug the projector. Do not attempt to remove or replace the Lamphouse without first removing power by turning power off with the remote (or PC terminal) and the circuit breaker on the side of the System Power Supply and unplugging the projector from the AC wall outlet. 2.
5.2 Ignitor HEX SCREW IGNITOR MOUNTING BOARD HIGH VOLTAGE TRANSFORMER NEGATIVE LASER POWER SUPPLY POSITIVE IN POSITIVE OUT Figure 2. Ignitor Assembly. The Ignitor Assembly consists of a Laser Power Supply, a High Voltage Transformer and the associated wiring. To remove the Ignitor Assembly: 1. Turn power off and unplug the projector. 2. Remove the front and rear covers. 3. Clearly label and remove the four (4) cables connected to the Ignitor Assembly. 4.
5. Carefully remove the Ignitor Assembly, being cautious not to lose the spacers that are under the board holes. When replacing the Ignitor Assembly, it will be easier to keep the spacers stationary by placing a small amount of super glue under them prior to replacing the Ignitor Mounting Board. Replace the Ignitor Assembly in reverse order.
