Marantz SR7009/U1B Service Manual page 117

5.3. A connected USB device is not recognized.
Is a USB hub being used?
Is the USB device supported by this unit?
d
Case of CX870 model
Are CN914 of the CX870MIDDLE PCB and BN321 of the USB PCB correctly con-
nected?
Case of CY920 model
Are CN321 of the DIGITAL PCB and BN321 of the USB PCB correctly connected?
Can a voltage (5V) be confirmed between pin 1 and pin 4 of JK608 (USB Connec-
tor) on USB PCB?
d
The USB signal circuit between CX870 or CY920 and JK608 of the
USB PCB are faulty.
5.4. No picture or sound is output
d
Are digital video signals((920PCK, 920VD0 - 920VD7)) output from
CX870 or CY920 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 and FAT32-for-
NO
matted mass storage class, MTP-compatible devices and
iPods (with the exception of some models).
NO
Connect the connectors correctly.
d
NO
Case of CX870 model
The circuit around IC911 of the CX870MID-
DLE PCB is faulty.
Case of CY920 model
The circuit around IC503 of the DIGITAL
PCB is faulty.
d
NO
The circuit around CX870 or CY920,
IC421(V.PLD) is faulty.
d
NO
The circuit around CY920 or CX870 or CX870MID-
DLE PCB is faulty.
NO
The circuit around IC221(A.PLD) is faulty.
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