Check the USB device being used
Checking the unit (If no picture is output)
YES
YES
Is the USB device supported by this unit?
•Check the VIDEO circuit.
Is a USB hub being used?
Are digital video signals((920PCK, 920VD0 - 920VD7)) output from
CX870 to IC421(V.PLD)?
This unit supports devices in the FAT16 and
FAT32-formatted mass storage class, MTP-
compatible devices and iPods (with the
exception of some models).
Do not use a USB hub.
NO
YES
NO
Checking the unit
Checking the unit:(If no sound is output)
YES
YES
YES
YES
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.
Check the AUDIO circuit of IC251(DSP) or later.
Are CN914 of the CX870MIDDLE PCB and BN321 of the USB PCB
correctly connected?
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.
The circuit around IC911 of the CX870MID
-
DLE PCB is faulty.
Connect the connectors correctly.
NO
NO
5.3. A connected USB device is not recognized.
5.4. No picture or sound is output
The circuit around CX870, IC421(V.PLD) is
faulty.
The circuit around CX870 or CXCX870MIDDLE PCB
is faulty.
The circuit around IC221(A.PLD) is faulty.
NO
NO
NO
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