JVC PD-50X795 Service Manual page 39

5.1.6 DETAILS
Self check is performed for the following items:
< Page 1 of screen (RECEIVER UNIT) >
Detection item Display
Low bias line short LOB
protection
Fan lock FAN
Presence of sync SYNC Confirmation of presence of video
signal
AC power input TIM
Main CPU MSM
communication
Digital tuner DIG
Main memory MEM
AV select switch AVSW Same as above.
3 dimensions YC YC
separator
Multi sound process AIO
RF tuner TUN
Ghost reduction GCR
DIST process IP
RGB process RGB
DVI (Digital DVI
communication)
Digital input HDMI
Detection content
Confirm the operation of the low bais
(2.5V / 3.3V / 5V / 9V) protection circuit.
Q9822 [REGULATOR PWB]
Confirm the operation of the cooling fan.
IC711 [ANALOG SIGNAL PWB]
sync signal.
M : Main sync signal
S : Sub sync signal
HD : Component sync signal
IC201 [ANALOG SIGNAL PWB]
Not used.
Confirmation of ACK (response)
signal which uses sync communications
with Chassis CPU.
IC7601 [DIGITAL SIGNAL PWB]
Not used.
Same as above
IC7602 [DIGITAL SIGNAL PWB]
IC301, IC501 [ANALOG SIGNAL PWB]
Same as above.
IC1001 [DIGITAL SIGNAL PWB]
Same as above.
IC3101 [RECEIVER PWB]
Same as above.
TU3001 [RECEIVER PWB]
Not used.
Confirmation of reply of ACK signal
2
which uses I C communication.
IC3001 [DIGITAL SIGNAL PWB]
Same as above.
IC4001 [DIGITAL SIGNAL PWB]
Same as above.
IC6101 [DIGITAL SIGNAL PWB]
Same as above.
IC8001 [DIGITAL SIGNAL PWB]
Diagnosis
signal Detection timing
(line)
LB_PRO Detection starts 3 seconds after the power is
turned on.
If error continues between 400ms the power is
turned off.
FAN_LOCK Detection starts 3 seconds after the power is
turned on.
If error continues between 250ms the power is
turned off.
SDA Confirmation of presence of sync signal in
video signal.
---
WAKE If it checks whenever sync communication with
sub (chassis) CPU performed and no reply of
ACK signal an error will be counted.
---
SDA If it checks whenever I
performed and no reply of ACK signal an error
will be counted.
SDA Same as above.
SDA Same as above.
SDA Same as above.
SDA Same as above.
---
SDA If it checks whenever I
performed and no reply of ACK signal an error
will be counted.
SDA Same as above.
SDA Same as above.
SDA Same as above.
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2
C communication is
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2
C communication is
(No.YA100)1-39