The circuit around CY920 is faulty.
YES
Can the NET1.8V output volt-
age (1.8 V) to Q7402 (FET-SW)
be conî™°rmed?
Can the NET2.5V output volt-
age (2.5 V) to IC742 (DC-DC
Conv.) be conî™°rmed?
Are the versions of the Ethernet SBL and IMG
displayed in Version Check Mode?
Is E_POWER3 (IC751 uCOM 56
pin) "Hi" ?
Is E_POWER2 (IC751 uCOM 55
pin) "Hi" ?
The circuit of E_POWER3 be-
tween IC751 and Q7402 are
faulty.
The circuit of E_POWER2
between IC751 and IC741 are
faulty.
The circuit around Q7402
(FET-SW) is faulty.
The circuit around IC742 (DC-
DC.Conv.) is faulty.
The Ethernet software is faulty.
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
In the same way as for Network connection troubleshooting, check the CY920 power supply and Eth-
ernet SBL, and that the IMG version is displayed correctly.
Is the Wi-Fi/BT antenna cable inserted correctly
into CY920?
Is the Bluetooth device compatible with the
A2DP proî™°le?
Is the Bluetooth function enabled on the Blue-
tooth device?
Connect the Wi-Fi/BT antenna cable correctly.
Use a device that is A2DP proî™°le compatible.
Enable the Bluetooth function and try connect-
ing again.
5.2. Cannot establish a Bluetooth connection
Checking the unit
Check the Bluetooth device being used
NO
NO
NO
68
Caution in
servicing
Electrical Mechanical Repair Information Updating
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