JVC AV-48WP34/AHA Service Manual page 58

AV-48WP30
Indication Check item
XRAY X-ray protection
OCP B1 Over-current protection
LOB Low B protection
SYNC Presence or absence of
synchronized signal
2
MEM E PROM memory
AVSW AV switch
VCD Video chroma
BS BS tuner
AIO Audio
YC 3DY/C
TUN RF tuner
PP P & P
IP IP
GCR GCR
TIM Timer
52
Details of detection
Operation of X-ray
protection circuit.
An B1 over-current is
detected.
Operation of low B short
protection circuit.
Presence of synchronized
signal.
HD : HD system
M : NTSC main
S : NTSC sub
2
ACK is returned when I C
traffic is carried out.
Ditto, MM1519 and
CXA2069Q
Ditto, AN5392
Ditto, BS tuner module
Ditto, BD3869
Ditto, upd64083
Ditto, RF tuner
Ditto, AMDP2(TMX57128)
Ditto, JCC5054
Not used
The power frequency is
changed as follows :
50Hz → 60Hz
60Hz → 50Hz
No. 51914
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.
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
carried out. Then the state is counted as a failure if ACK
is not returned.
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
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.
2
C traffic is