Denon AVR-4520

105
Input
CVBS,COMP
A
Check the input signal to video decoder
IC(DIGITAL UNIT U1102).
V : R1104
COMPONENT-Y : R1101
COMPONENT-Cb : R1103
COMPONENT-Cr : R1102.
Check the output signal from video
encoder IC (DIGITAL UNIT U1401).
V : Q1401-E
COMPONENT-Y : Q1402-E
COMPONENT-Cb : Q1403-E
COMPONENT-Cr : Q1404-E.
Check of the I
2
C control signal of video
selector IC(U3703).
8U-210119-4 CONNECT2 UNIT
I
2
C(SCL) : N 4007-18pin
I
2
C(SDA) : N4007-17pin
see the sample wave form (page
106 ).
To B
• Defective connection of N3701.
• Power supply IC (U3701 or U3702) aw.
•
To B
• DIGITAL UNIT aw.
• Defective connection of the connector
(N4007 or N4004).
• 8U-310116 DIGITAL UNIT aw.
NO
NO
NO
NO
YES
YES
YES
YES
Check power supply voltage.
8U-210119-1 AUDIO/VIDEO UNIT.
V+3.3V : U3701 Out pin
V-5V : U3702 Out pin