Denon AVR-1909 Service Manual page 26

B
Input
COMPONENT
Check power supply voltage
VIDEO UNIT
+5V : CN2005-8pin
-5V : CN2005-7pin
MC_+5V : CN2001-5pin
OK
Check input of HDMI UNIT video decoder
signal.
Check VIDEO CNT UNIT signal DET.
NG
Input V : C1281
Input Y : C1273
Input C : C1271
Check soldering of VIDEO CNT UNIT
OK
Check output of driver(IC1018)
Check output of after HDMI UNIT
after HDMI UNIT video encoder.
OutputV : CN1008 7pin
OutputY : CN1008 11pin NG
Output C :CN1008 9pin
Output Y: CN1009 9pin§
Output Cb : CN1009 11pin
Output Cr : CN1009 13pin
OK
CVBS/S output
Check soldering of output selector
Check output of AMP
and surrounding circuitry. Check sol-
Output V : IC2016-24pin NG
dering of VIDEO CNT UNIT connec-
Output Y : IC2016-20pin
Output C : IC2016-22pin
OK
Check cable between main unit
and monitor or Check monitor.
Check input of input selector and
surrounding circuitry soldering. Check
soldering of VIDEO CNT UNIT connector
NG
base.
Input : IC2023
or CPU UNIT flaw.
Unless specified, VIDEO UNIT part.
Check power supply voltage
HDMI UNIT
To troubleshooting 1.1
NG
+9V : CN2005-9pin
Power not turn on.
+3.3 : IC1015-O,IC1017-IN
+1.8V : IC1016,IC1017-O
Check input of input selector
and Video AMP, surrounding
circuitry soldering.
NG
Y : CP1006-12pin : H(+5V) Input : IC2023
Video AMP : IC2021
or CPU UNIT flaw.
OK
connector base, and check poor
contacts.
video encoder. Check input of HDMI UNIT Video
OutputY : C1245 -side§ Decoder(IC1020)/
NG
Output C : C1243 Encoder(IC1019) and surrounding
Output Y: C1257 -side§ circuitry soldering.
Output Cb : C1260 -side§ or CPU UNIT flaw.
Output Cr : C1265 -side§
OK
Check soldering of IC1015 and
surrounding parts.
tor base.
Output : IC2014,IC2015
Check input of AMP Check output of AMP
Input Y : C2123 +side§ Output Y : IC2022-13pin
NG
Input Cb : C2131 +side§ Output Cb : IC2022-11pin
Input Cr : C2136 +side§ Output Cr : IC2022-9pin
OK
Check soldering of IC2022 and Check cable between main unit
surrounding parts. and monitor or Check monitor.
OK
OK
OK
CVBS/S
COMPONENT output
OK
OK
26
AVR-1909/789, AVC-1909
NG
NG NG
OK
NG NG
OK
NG
NG NG
OK
COMPONENT
OK