Change of a GY-240 in
a GY-401 (without guarantee)

Preface

The AVCS gyroscope GY-240 and GY-401 are
moderately identically constructed developed hardware and software. Only difference with the GY-240 are less a few parts on the PCB,
2 missing drillings in the housing and a missing lead. These construction units
must be re-tooled. Functionally the change-over is not possible into the faster
gyroscope mode, the adjustment of the sensibility of the transmitter out and
the attitude of the full-scales of the Servos therefore with the GY-240.

The change can be relatively simply made. For a few EURO can make
experienced electronics an amateur handicraftsman with a fine soldering iron
and sufficiently experience in the fine SMD soldering
(the construction units are only 2
mm large) the change within a half hour.

When opening the housing any warranty expires. The plate has very fine
structures (conductive strips). When inappropriate soldering the conductive
strips can be damaged or destroyed. Short-circuits can destroy electronics.
Support for problems cannot take over the salesman of the gyroscope therefore.
Some construction units are very temperature sensitive.

The change

1  open the housing with a small kreuzschlitz
screwdriver of size 000. The screws are on the lower surface of the gyroscope.
With opening the guarantee expires on the gyroscope!!!

2. Unsolder the
3 pole plate connection. With a Entloetlitze you remove the still existing tin solder from
the drillings.

3. Remove the bridge in form of a SMD of
reconditions (BR) of the lower surface of the processor plate. You reinsert the
bridge on the top side of the processor plate.

4. Remaining construction units solder. Use a very fine soldering iron
and tin solder.

5. From additional cables (for gyroscope sensitivity and AVCS change-over) the feedkabel
remove (black and red). The control line (yellow or point depending upon cable
manufacturer) of the lower surface into the plate

BR von lower side,

Led Red  Potentiometer
10 K    on upper page
330R        Bc848

additional
cable  0.1 u    1k
0,1 u  1K    additional cable

6. Drilling it from the rear 2 holes by the front plate into the
housing. The drill locations are already marked. The drilling of the
potentiometer has a diameter of 3
mm,

the drilling the LED has
a diameter of 2 mm.

7. Remove conscientiously drilling splinters from the housing for

8. Removing you possibly existing tin solder remainders from the plate
the

operating
instructions of the GY-401 can as pdf file from the
homepage www.robbe.de be loaded.

The original label of the GY-401.

Also with the converted GY-240 digitally servo

in the fast DS mode may be changed

only with the approved Futaba.

With limits you can limit way
for the servo.

Test the gyroscope before the first flight
conscientiously. An incorrect gyroscope nearly always leads to an uncontrolled
crash. Particularly in handling a model helicopter very clean working and a
responsible person handling all components necessary for the safe enterprise
are necessary. If you did not solder ever SMD of
construction units, do you give rather few? more for a
GY-401 out.