SECTION 5
TROUBLESHOOTING
5.1PROTECTIVE SENSOR AND PROTECTIVE SWITCH
In event of abnormal operation due to circuit or component failure, setting error or other reason, in order to prevent serious damage to the set and preserve the integrity of peripheral equipment, sensors and switches are provided for protective functions. Cooling is conducted at the same time a corresponding LED flashes (about 90 seconds). The LED indication with respect to the protective func- tion is described below.
5.1.1 Protective sensor
Type | Monitor objective | Location | Operating point | Function |
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Thermal sensor | Lamp unit | Optical block (Lamp section) | 140°C | AC line (one side) open |
(Thermostat) |
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Thermal sensor (IC) | Set interior | MAIN PWB ASS'Y IC728 | 70°C | Power off by main CPU (emergency mode) |
| (Lamp area) |
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Thermal sensor (IC) | Set exterior | MAIN PWB ASS'Y IC727 | 62°C | Power off by main CPU (emergency mode) |
| (Filter area) |
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Motor operation | Cooling fan | Cooling fan interior | Fan stop | Power off by main CPU (emergency mode) |
detection circuit |
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5.1.2 Protective switch
Type | Monitor objective | Location | Operating point | Function |
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Interlock switch | Lamp cover | Optical block (Lamp section) | Switch open | Control by CPU |
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5.2LED (INDICATOR) WARNING INDICATIONS
5.2.1 Led indication contents
If an abnormality occurs during operation (projection), the content of the problem can be determined from flashing LED indicators. When an LED indicates, operation (projection) automatically stops and the
No. |
| Flashing LED |
| Flash time | Warning cause (projector mode) | |
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| LAMP | TEMP | STAND BY | OPERATE |
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1 | z |
| z |
| 0.5sec. | Lamp not lighted cannot project |
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2 | z |
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| z | 0.5sec. | Lamp extinguishes during projection Lamp use time ex- |
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| ceeds 2010 hours | ||||
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3 | ⋅ |
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| ⋅ | 0.5sec. | Lamp terminal not contact |
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4 | z | z |
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| 0.5sec. | Sub CPU circuit error |
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5 | z | z |
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| 0.25sec. | Device drive circuit error |
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6 | ⋅ | ⋅ |
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| 0.5sec. | Video process circuit (decoder) error |
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7 | ⋅ | ⋅ |
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| 0.25sec. | Video system error after data initializing |
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8 |
| z |
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| 0.5sec. | Set interior abnormally hot |
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9 |
| z | z |
| 0.5sec. | Air intake temperature too high (exterior temperature |
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| abnormal) | ||||
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10 | z | z | z | z | 0.5sec. | Set internal cooling fan stopped (fan locked) |
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11 | z |
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| 0.5sec. | Lamp use time exceeds 2000 hours |
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z : Flashing together | ⋅ : Flashing alternately |
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