JVC HD-Z56RF7 Service Manual page 37

5.1.7 DISPLAY METHOD WHEN RASTER IS NOT AVAILABLE
In a state where a display screen does not appear due to the failure of this unit, the POWER LED (blue) and LAMP/PROGRAM LED
(orange) can be flushing and display a trouble mode.
The factors in case the power is forcibly shut down at the time of failure are memorized and those are displayed.
Check item
Low bias line short Detection of the low bias line(5V/9V/12V) short.
protection Q9821, Q9831,
Lamp cover open Detection of the interlock switch status for the lamp
cover. (H = Abnormal)
S0861
Lamp goes out Detection of lamp return (LAMP_RTN) signals output
depending on the status of the lamp supply electric current
monitored constantly within the lamp ballast unit. (H = Off)
CNBCT1
Lamp does not light up Detection of lamp return (LAMP_RTN) signals output
depending on the status of the lamp supply electric current
monitored constantly within the lamp ballast unit. (H = Off)
CNBCT1
Fan lock (stop) for Detection of LOCK signals outputting the operation
optical system (circuit) status of the cooling fan. (H=Abnormal)
IC8005
Abnormal DD CPU Detection of serial communication error between MAIN
circuit DRIVE PWB and RECEIVER PWB.
IC3701
Abnormal D-ILA Detection of abnormal inner cabinet temperature. (53°C)
DEVICE temperature IC2001
EXPLANATION ON ACTION
If NG is detected on an item being diagnosed, turn off the power on this unit. As soon as the power goes off, turn on and off POWER
LED and LAMP LED immediately. After the power is shut down, it becomes impossible to turn on the power until the power cable
is either plugged in or unplugged from the AC outlet.
• When the error of [1] occurs, [2], [3], [4], [5], [6] are no longer recognized.
Contents
Q9861 [POWER PWB]
[LAMP COVER SW PWB]
[DRIVE PWB]
[DRIVE PWB]
[DRIVE PWB]
[DRIVE PWB]
[THERMO PWB]
http://www.pureglare.com.au
LED flash cycle
Classifications
POWER LED
(BLUE)
1 ---
2 0.1 sec interval Simultaneously
5 0.1 sec interval Simultaneously
5 0.1 sec interval Simultaneously
3 0.5 sec interval Alternately
4 0.5 sec interval Alternately
6 0.5 sec interval Alternately
LAMP/
PROGRAM LED
(ORANGE)
1 sec interval
(No.YA460)1-37