Marantz NR1506 /U1B Service Manual page 78

5.3. Cannot recognize the connected USB device
Is a USB hub being used?
Is the USB device supported by this unit?
Are N1023 of the HDMI PCB and CN4401 of the USB PCB correctly
connected?
Can a voltage (5V) be confirmed between pin 1 and pin 4 of CP4402
(USB Connector) on USB PCB?
The USB signal circuit between CY920 and CP4402 of the USB PCB
are faulty.
5.4. No picture or sound is output
Are digital video signals(920PCK, 920VD0 - 920VD7) output from
CY920 to U1026 (MN864788A)?
•Check the VIDEO circuit.
Are the I2S signal output to pins 26, 28, 30 and 34 of the U1034 HDMI
PCB ?
(The 30, 32, 34pin in the case of DSD)
Are audio signal output to pin 8 of U1017 (A.PLD) on HDMI PCB.
Check the U1021(DSP) AUDIO circuit and the circuits thereafter.
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 iPod devices
(except for some models).
NO
Connect the connectors correctly.
NO
The circuit around U1023 of the HDMI PCB
is faulty.
NO
The circuit around CY920, U1026(M-
N864788A) is faulty.
NO
The CY920 is faulty.
NO
The circuit around U1017(A.PLD) is faulty.
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