TROUBLESHOOTING
In this section, we look again at what to do if the movement test carried out in this stage does
not go as described. As the arms have been tested previously, we will focus on the operation
of the neck and back servos, as well as the speaker, from which Robi says ‘OK!’
Before dismantling the assembly to check its individual servos, check the other electrical components used in the test.
HEAD/NECK/BACK SOCKET
CHECK THAT THE CABLE IS CONNECTED TO
THE CORRECT SOCKET ON THE CPU
CHECK THAT THE SERVO CABLE IS
SECURELY CONNECTED TO THE CPU
CHECK THAT THE
BATTERY IS CHARGED
Ensure that the back servo
cable’s connector is sitting
securely within its socket.
Remove and replace it carefully
if need be.
The socket farthest from
the micro SD card slot on
the CPU board will hold the
servo cable running from
the back servo.
The test will only run if sufficient
power is received from the
battery, so make sure the battery
is fully charged (see the Close-
Up box in Stage 59).
INITIAL CHECKS
Neck stand (Stage 53)
Along with the Phillips screwdriver
supplied with Stage 2, you will need
the following:
IF NEITHER HEAD SERVOS MOVES
If neither head servo moves when you start the test, it is
probable that there is a misplaced connection, so go back
and check these. If this does not resolve the issue, you will
need to check/reset their ID numbers.
DISASSEMBLY
Follow the assembly of Steps 15-31 of this stage in reverse, and
carefully check the connections made in the steps before. If
both were sound, you will need to check the servos’ ID numbers,
resetting them if necessary.
IF ONLY ONE SERVO MOVES
If one servo moves but the other does not, it is likely that one
of the ID numbers has been set incorrectly.
If you need to reset Robi’s head servos, they are ID=14 (left-
hand side of head servo frame, programmed in this stage) and
ID=15 (right-hand side of frame, programmed in Stage 59).
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