Marantz AV7005/N1B, Service Manual, Page: 45 / 199

45
Input
COMPONENT
C
Check of power supply voltage
V+5V : N2004-4pin
V-5V : N2004-1pin
Extend HDMI B'D using a jig.
REGULATOR B'D fl aw
HDMI B'D fl aw
NG
NG
OK
OK
Check on set value of each IC.
HDMI B'D
L4900 : Check I
2 C communication
waveforms.
L4901 : Check I 2 C communication
waveforms.
b
Unless speci fi ed, VIDEO B'd part.
Check output of selector (U2003).
COMPONENT-Y : JV1
COMPONENT-Cb : JV128
COMPONENT-Cr : JV31 Check cable between main unit
and monitor or check monitor.
Check FRONT CONNECTOR B'D
fl aw, and connection of FRONT
CONNECTOR B'D or HDMI B'D and
VIDEO B'D.
OK
OK
Check input of selector (U2003).
COMPONENT-Y : JV80
COMPONENT-Cb : JV79
COMPONENT-Cr : JV175
NG NG
Check power supply voltage of
U2003, and surrounding circuitry
soldering.
I2C communication waveforms
CH1 㧦 CLK
CH1 㧦 DATA