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(No.PA019)1-31
SECTION 5
TROUBLESHOOTING
5.1 PROTECTIVE 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
5.1.2 Protective switch
5.2 LED (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 cool-down mode (about 90 seconds) is entered (except for
No.1, No.3, No.4, No.5 and No.6), then the stand-by mode.
z : Flashing together × : Flashing alternately
Type Monitor objective Location Operating point Function
Thermal sensor
(Thermostat)
Lamp unit Optical block (Lamp section) 140°C AC line (one side) open
Thermal sensor (IC) Set interior
(Lamp area)
MAIN PWB ASS'Y IC728 70°C Power off by main CPU (emergency mode)
Thermal sensor (IC) Set exterior
(Filter area)
MAIN PWB ASS'Y IC727 62°C Power off by main CPU (emergency mode)
Motor operation
detection circuit
Cooling fan Cooling fan interior Fan stop Power off by main CPU (emergency mode)
Type Monitor objective Location Operating point Function
Interlock switch Lamp cover Optical block (Lamp section) Switch open Control by CPU
No. Flashing LED Flash time Warning cause (projector mode)
LAMP TEMP STAND BY OPERATE
1 zz0.5sec. Lamp not lighted cannot project
2 zz0.5sec.
Lamp extinguishes during projection Lamp use time ex-
ceeds 2010 hours
3 ××0.5sec. Lamp terminal not contact
4 zz 0.5sec. Sub CPU circuit error
5 zz 0.25sec. Device drive circuit error
6 ×× 0.5sec. Video process circuit (decoder) error
7 ×× 0.25sec. Video system error after data initializing
8 z 0.5sec. Set interior abnormally hot
9 zz 0.5sec.
Air intake temperature too high (exterior temperature
abnormal)
10 zzzz0.5sec. Set internal cooling fan stopped (fan locked)
11 z 0.5sec. Lamp use time exceeds 2000 hours