GE Giraffe Blue Spot PT Lite - Page 60

60
Chapter 10: Diagnostics and Troubleshooting
ID Symptom Description Possible Causes Actions & Solution
S7
When the system is
switched to on mode, the
over/under temperature
indicator is illuminated in
ashing red.
The system
temperature is high
(over-temperature
condition).
Make sure the system is used in the recommended
temperature range. Check whether the vents are blocked.
Unblock vents and replace the air lter if necessary.
NOTE: Once the air vents are unblocked, the fan will
continue to run to cool the LED module. Once the LED
module cools, the over/under temperature indicator will
also turn o and the standby/on indicator will illuminate
green. This process may take several minutes.
System fan is not
functioning or it is
installed backward.
Remove the unit cover and check whether the fan
is installed properly and functioning. If the fan is
installed backward, re-install it properly. If the fan is not
functioning, a) check whether the fan is plugged in and/or
any objects are stuck in it. b) disconnect the fan wire from
the LED driver board and measure the voltage between
FAN+ and FAN- test points on the LED driver. If the
voltage is within 12V +/- 0.15 range, then replace the fan.
Otherwise, replace the LED board. Refer to section 11.7.
S8
When the system is
switched to on mode,
the standby/on indicator
turns to blue but no light
is generated.
Light output block.
Unplug the system power cord from the power outlet.
Remove the light pipe and look into the light pipe port to
conrm no object is blocking the light output.
LED anode or
cathode cables
connections
are reversed or
unplugged.
Remove the unit cover and check whether the anode and
cathode cables are unplugged or reversed. Make proper
connections if necessary. Refer to section 11.7.
The control harness
is defective.
Remove the control harness and use a multi meter to
perform a wire continuity check on the harness wires.
Replace the harness if necessary.
LED module is
defective.
Use a digital multi meter set for checking diodes to check
the therapeutic light LED. Disconnect the LED anode
and cathode cables from the driver board. If any of the
following steps fail, LED module is defective; Otherwise,
the driver board is defective. Order the LED module FRU
kit to replace both the LED module and the driver board:
a) Connecting the meter’s positive lead to the anode, and
the negative lead to the cathode, should yield about 2.5V
and potentially dimly light the LED. b) Reversing the leads
should result in an open voltage on the LED and the LED
should not light.
S9
Light pipe does not rotate
or is very hard to rotate.
Ground clip is
damaged.
Check whether the ground clip is damaged. If it is
damaged, replace it. Refer to section 11.3.
Light pipe O-rings
are damaged or
have insucient
lubricant.
Remove the light pipe and examine the O-rings for any
damages or lack of lubricant. If necessary, replace the
O-rings. Refer to section 11.3.
S10
Light pipe sags and it
doesn’t hold the position.
Light pipe is
damaged.
Replace the light pipe. Refer to section 11.3.