CEMB USA K8 (C) - Manual (Page 9)

I 0668 - 9 GB
During machine operation, various causes of faulty operation could occur. If detected by the microproces
sor, they appear on the display as follows: (example: )
ERRORS CAUSES CONTROLS
Black The wheel balancer does not turn on. 1. Check proper connection to the mains.
2. Check and if necessary replace the fuses on the power board.
3. Replace the computer board.
Err. 1 No rotation signal. 1. Check belt tautness.
2. Check in self-diagnostics that the encoder functions properly
3. Replace the phase encoder.
4. Replace the computer board.
Err. 2 Too low speed during measurement.
During the unbalance measurement revolu-
tions, the wheel speed has fallen to below
42 rpm.
1. Check that a vehicle wheel has been mounted on the wheel balancer.
2. Check belt tautness.
3. Check in self-diagnostics that the encoder functions properly
4. Detach the measuring head connector from the board and do a
spin (if no error is detected, replace the measuring heads).
5. Replace the computer board.
Err. 3 Too high unbalance. 1. Check the wheel dimension setting.
2. Check the sensor connections.
3. Run the machine calibration function.
4. Mount a wheel with a more or less known unbalance (less than 100
grams) and check the machine response.
5. Replace the computer board.
Err. 4 Rotation in opposite direction.
After pressing [START], the wheel starts tur-
ning in the opposite direction (anticlockwise).
1. Verify the connection of the UP/DOWN - RESET signals on the
phase encoder.
2. Check the bearing/spring of the phase generator
Err. 5 Guard open
The [START] pushbutton was pressed
without fi rst closing the guard.
1. Reset the error.
2. Close the guard.
3. Verify the function of the protection switch.
4. Press the [START] button.
Err. 7 /
Err. 8 /
Err. 9
NOVRAM parameter read error 1. Repeat machine calibration
2. Shut down the machine.
3. Wait for at least ~ 1 min.
4. Restart the machine and check proper functioning.
5. Replace the computer board.
Err.14/
Err.15/
Err.16/
Err.17/
Err. 18/
Err. 19
Unbalance measurement error. 1. Check functioning of the phase encoder.
2. Check the sensor connections.
3. Check the machine earthing connection.
4. Mount a wheel with a more or less known unbalance (less than 100
grams) and check the machine response.
5. Replace the computer board.
Err.20 Wheel at standstill. The wheel is at a
standstill for more than one second after
START.
1. Check functioning of the phase generator.
2. Check the connections on the power board.
3. Replace the computer board.
Err.21 Motor on for more than 15 seconds. 1. Check functioning of the phase encoder.
2. Check the connections on the power board.
3. Replace the computer board.
Err. 24 Distance between the spokes smaller
than 18 degrees.
1. The minimum distance between the spokes where to split the
unbalance must be more than 18 degrees
2. Repeat the SPLIT function increasing the distance between the
spokes.
Err. 25 Distance between the spokes greater
than 120 degree
1. The minimum distance between the spokes where to split the
unbalance must be less than 120 degrees
2. Repeat the SPLIT function reducing the distance between the spokes.
Err. 26 First spoke too far from unbalance position 1. The minimum distance between the unbalance position and the
spoke must be less than 120 degrees.
2. Repeat the split function reducing the distance between the spokes.
6.1 - INCONSISTENT UNBALANCE READINGS
►
Sometimes after balancing a wheel and removing it from the balancing machine, it is foun d that, mounting it
on the machine again, the wheel is not balanced. This does not depend on incorrect indication of the machine,
but only on faulty mounting of the wheel on the adapter, i.e. in the two mountings the wheel has assumed a
different position with respect to the balancing machine shaft centre line. If the wheel has been mounted on
the adapter with screws, it could be possible that the screws have not been correctly tightened, i.e. crosswise
one by one, or else (as often occurs) holes have been drilled on the wheel with too wide tolerances. Small
errors, up to 10 grams (0.4 oz) are to be considered normal in wheels locked by a cone; the error is normally
greater for wheels fastened with screws. If, after balancing, the wheel is found to be still out-of-balance when
refi tted on the vehicle, this could be due to unbalance of the car brake drum or very often due to the holes
for the screws on the rim and drum sometimes drilled with too wide tolerances. In such case a readjustment
could be advisable using the balancing machine with the wheel mounted on the car.
ERRORS