Denon AVR-X4100W Service Manual page 113

5.3. A connected USB device is not recognized.
Is a USB hub being used?
Is the USB device supported by this unit?
Are CN914 of the CX870MIDDLE PCB and BN321 of the USB PCB cor-
rectly connected?
Can a voltage (5V) be confirmed between pin 1 and pin 4 of JK608
(USB Connector) on USB PCB?
The USB signal circuit between CX870 and JK608 of the USB PCB are
faulty.
5.4. No picture or sound is output.
Are digital video signals((920PCK, 920VD0 - 920VD7)) output from
CX870 to IC421(V.PLD)?
•Check the Video circuit.
Are I2S signal output to pin 26, 28, 30, 34 of the CN501 DIGITAL PCB ?
(The 30, 32, 34pin in the case of DSD)
Are audio signal output to pin 85 of IC221(A.PLD) on DIGITAL PCB.
Check the AUDIO circuit of IC251(DSP) or later.
Check the USB device being used
NO
YES
Checking the unit
YES
YES
Checking the unit (If no picture is output)
YES
Checking the unit:(If no sound is output)
YES
YES
YES
Do not use a USB hub.
This unit supports devices in the FAT16
NO
and FAT32-formatted mass storage class,
MTP-compatible devices and iPods (with
the exception of some models).
NO
Connect the connectors correctly.
NO
The circuit around IC911 of the CX870MID-
DLE PCB is faulty.
NO
The circuit around CX870, IC421(V.PLD) is
faulty.
NO
The circuit around CX870 or CX870MIDDLE PCB is
faulty.
NO
The circuit around IC221(A.PLD) is faulty.
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