EFX 885, 835, 825
Service Manual 20039-166
Page 91
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Troubleshooting 5.13 Upper Display does not Illuminate
1.
Because this is self powered unit, the display will not illuminate until it is used or the optional external power
supply is equipped. If the optional external power supply is equipped, the display should be constantly
illuminated. If the optional external power supply is not equipped, the unit must be used at a stride rate of 20
strides per minute or higher for the display to illuminate.
2.
If the optional external power supply is not equipped, skip to step 5.
3.
Disconnect the optional external power supply from the EFX and measure between the inner and outer sleeves
4.
If the voltage measured in step 3 was significantly low, replace the optional external power supply. If the voltage
measured in step 3 was 0 Vdc, disconnect external power supply from its AC outlet and measure the voltage at
the AC outlet. If the AC outlet voltage is normal replace the optional external power supply. If the AC outlet
voltage is significantly low or 0 Vdc, the AC system must be inspected by an electrician.
5.
Troubleshoot the generator per Procedure 9.2.
6.
If the generator was found to be good, the problem will be in either the lower PCA, upper PCA or the upper to
lower PCA interconnect cables.
Warning
Because this is a self powered unit, it will either be necessary to either equip the unit with the optional external power
supply or have an assistant pedal on the unit while voltage measurements are being taken. Because of the danger of
working on the unit while it is in motion using the optional external power supply is strongly recommended.
7.
Remove the rear cover and disconnect the interconnect cable from the J2 connector of the lower PCA.
8.
The following voltage reading must be taken while the unit is in motion. Extreme care must be taken to keep
meter leads, hands, etc. clear of all moving parts. Using a DC voltmeter, measure the voltage between TP13
(+5D) and TP4 (DGND). Refer to Diagram 5.13.1. The voltage measured should be approximately 5 Vdc. If the
voltage is significantly low, replace the lower PCA. Additionally, the DS1 LED should illuminate.
9.
Reconnect the interconnect cable to the J2 connector of the lower PCA and repeat the voltage measurement in
step 8. The voltage measured should be approximately 5 Vdc. If the voltage is significantly low, the problem is in
the upper PCA or the upper to lower PCA interconnect cables.
Summary of Contents for EFX 825
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