Nokia N900 - Page 32

CU-4 Control unit
CU-4 is a general service tool used with a module jig and/or a flash
adapter. It requires an external 12 V power supply.
The unit has the following features:
•
software controlled via USB
•
EM calibration function
•
Forwards FBUS/Flashbus traffic to/from terminal
•
Forwards USB traffic to/from terminal
•
software controlled BSI values
•
regulated VBATT voltage
•
2 x USB2.0 connector (Hub)
•
FBUS and USB connections supported
When using CU-4, note the special order of connecting cables and
other service equipment:
Instructions
1 Connect a service tool (jig, flash adapter) to CU-4.
2 Connect CU-4 to your PC with a USB cable.
3 Connect supply voltage (12 V)
4 Connect an FBUS cable (if necessary).
5 Start Phoenix service software.
Note: Phoenix enables CU-4 regulators via USB when it is
started.
Reconnecting the power supply requires a Phoenix restart.
RX-51
Service Tools and Service Concepts
Page 2 –8 COMPANY CONFIDENTIAL Issue 1
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