5. Network / Bluetooth / USB
5.1. Cannot connect to the network
Can the D3.3V output voltage
(3.3V) to [IC741 : DC-DC Conv.]
be conrmed?
Can the LEGO5V output voltage
(5V) to [Q7402 : FET-SW] be con-
rmed?
Can the voltage (5V) be conrmed between
[CN741 : 1pin]?
Is D5V_POWER [IC751 : 122pin
uCOM] "Hi" ?
Is NET5V_POWER [IC751 : 40pin
uCOM] "Hi" ?
The circuit of D5V_POWER be-
tween [IC751-IC741] are faulty.
The circuit of NET5V_POWER
between [IC751-Q7402] are
faulty.
The circuit around [IC741 : DC-
DC.Conv.] is faulty.
The circuit around [Q7402 :
FET-SW] is faulty.
TO "6. SMPS"
Can the NET3.3V output voltage
(3.3V) to [Q7404 : FET-SW] be
conrmed?
Is NET3V3_POWER [IC751 :
111pin uCOM] "Hi" ?
The circuit of NET3V3_POWER
between [IC751-Q7404] are
faulty.
The circuit around [Q7404 :
FET-SW] is faulty.
YES
YES
YES
YES
YES
NO NO
NO
NO
NO
NO
NO
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
Check the setting
Are the network settings of this unit correct?
Are peripheral devices such as the router and hub
connected to this unit correctly?
Are the router settings correct?
Set the IP address, etc. correctly.
When the static IP address is used, check that no
other devices have the same IP address and that
the subnet mask settings are correct.
Connect the peripheral devices correctly.
Check the instruction manual of the router and
congure the settings correctly.
Check that there are no connection restrictions by
MAC addresses, etc.
Is the LAN cable correctly inserted?
Insert the LAN cable correctly and then turn on
the power again.
Check the connection environment
Checking the unit
The circuit of Network Module is faulty.
Are the versions of the HEOS Version displayed in
Version Check Mode?
The Network Module software is faulty.
YES
NO
71
Caution in
servicing
Electrical Mechanical Repair Information Updating
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