Troubleshooting - JVC DLA-HD2KE Service Manual

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
Type Monitor objective
Thermal sensor Lamp unit
(Thermostat)
Thermal sensor (IC) Set interior
(Lamp area)
Thermal sensor (IC) Set exterior
(Filter area)
Motor operation Cooling fan
detection circuit
5.1.2 Protective switch
Type Monitor objective
Interlock switch Lamp cover
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.
No.
LAMP TEMP
1
2
3
4
5
6
7
8
9
10
11
: Flashing together : Flashing alternately

TROUBLESHOOTING

Location
Optical block (Lamp section) 140 C
MAIN PWB ASS'Y IC728
MAIN PWB ASS'Y IC727
Cooling fan interior
Location
Optical block (Lamp section) Switch open
Flashing LED
STAND BY OPERATE
SECTION 5
Operating point
70 C
62 C
Fan stop
Operating point
Flash time
0.5sec. Lamp not lighted cannot project
Lamp extinguishes during projection Lamp use time ex-
0.5sec.
ceeds 2010 hours
0.5sec. Lamp terminal not contact
0.5sec. Sub CPU circuit error
0.25sec. Device drive circuit error
0.5sec. Video process circuit (decoder) error
0.25sec. Video system error after data initializing
0.5sec. Set interior abnormally hot
Air intake temperature too high (exterior temperature
0.5sec.
abnormal)
0.5sec. Set internal cooling fan stopped (fan locked)
0.5sec. Lamp use time exceeds 2000 hours
Function
AC line (one side) open
Power off by main CPU (emergency mode)
Power off by main CPU (emergency mode)
Power off by main CPU (emergency mode)
Function
Control by CPU
Warning cause (projector mode)
(No.PA019)1-31