JVC AV-65WP74/HA Service Manual page 68

AV-65WP74
Indication
XRAY X-ray radiation protection
OCP B1 over-current protection
LOB Low B short protection
TIM Timer
SYNC Presence or absence of
synchronized signal
MEM Memory (EEP-ROM)
AVSW AV switch
VCD Video / chroma process
(RGB process)
BS Broadcast satellite tuner
AIO Audio process
(MTS decode / audio control)
YC 3D YC separation
TUN RF tuner
GCR Ghost reduction
PP Picture & Picture
(Multi-picture)
IP DIST process
1-68 (No.52096)
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Check item
Operation of X-ray protection circuit.
D561, D562 : POWER & DEF PWB
An B1 over-current is detected.
Q971 : POWER & DEF PWB
Operation of low B short protection
circuit.
Q1961(5V), Q1962(9V) : MAIN PWB
The AC power frequency is changed
as follows :
50Hz ---> 60Hz
60Hz ---> 50Hz
Presence of synchronized signal.
HD : HD signal
M : NTSC main signal
S : NTSC sub signal
IC1301(AN5392) : MI-COM & DIST
MODULE PWB
ACK is returned when I
carried out.
IC1703(MEMORY) : MI-COM & DIST
MODULE PWB
Ditto
IC1301(AN15852A) and
IC1501(CXA2069Q) : MAIN PWB
Ditto
IC1301(AN5392) : MI-COM & DIST
MODULE PWB
Not used
Ditto
UPC1851BCU
IC0201(CXA2134Q-X) : RECEIVER
PWB
Ditto
IC3001(MN82832) : MI-COM & DIST
MODULE PWB
Ditto
Main & sub RF tuner
Not used
Ditto
IC101(TMS57128GJG) : MI-COM &
DIST MODULE PWB
Ditto
IC201(JCC5054) : MI-COM & DIST
MODULE PWB
Details of detection
2
C traffic is
Method of detection
At about 3 seconds after the power is turned
on, the self-check function starts. If NG is
detected for 200ms, the power is turned off
automatically.
At about 3 seconds after the power is turned
on, the self-check function starts. If NG is
detected for 200ms, the power is turned off
automatically.
At about 3 seconds after the power is turned
on, the self-check function starts. If NG is
detected for 200ms, the power is turned off
automatically.
Periodically check the power frequency by
counting the AC pulse and monitor whether or
not the frequency is changed except for the
time immediately after resetting.
When entering the self-check mode, "OK" is
shown.
While running the mode with picture signal, if
the synchronized signal is disappeared, "NG"
is shown.
The state is monitored every time when I
traffic is carried out. Then the state is counted
as a failure if ACK is not returned.
Ditto
Ditto
Not used
Ditto
Ditto
Ditto
Not used
Ditto
Ditto
2
C