Troubleshooting - SpectraDynamics HPDA-15RMi-S Operating Manual

7.0 Troubleshooting

of providing first aid or resuscitation, is present. If there are problems that cannot be
resolved by the troubleshooting steps below please contact technical support.
Technical Support Tel: +1 (303) 665-1852 , Fax: +1 (303) 604-6088
support@spectradynamics.com, www.spectradynamics.com
The threshold for a valid signal is 6.8 dBm when the input signal is decreasing in
amplitude and 7.2 dBm when the input signal is increasing in amplitude.
The switching circuit of the HPDA-15RMi-S has approximately 0.5 dB of hysteresis to
avoid multiple switching events when the amplitude of the input signal is very close to the
threshold. The recommended valid input signal levels are +8 to +15 dBm.
The signal LEDS for channels 1-10 are all ON but the input signal led is OFF.
The INPUT 1 and INPUT 2 leds are OFF when the input signal level is less than +7dBm,
however the output channel monitors may still show a valid signal because the amplifier
has gain of up to +0.5 dB. In addition, if the outputs are not connected to a load the signal
level on the output channels may still be high enough to activate the output channel
monitor LEDs.
AC Power LED does not turn on.
Disconnect all power cords and remove the top cover. Check the main AC power fuse
and power cord. If the fuse is blown replace with same type and rating. Please contact
SDI if the fuse blows again or if the event that caused the fuse to blow is not known.
DC Power LED does not turn on.
Disconnect all power cords and remove the top cover. Check the DC power fuse and
cable assembly and make sure that the power supply is powered on and meets the
required specifications. If the fuse is blown replace with the same type and rating. Please
contact SDI if the fuse blows again or if the event that caused the fuse to blow is not
known.
INPUT LED does not turn on.
The INPUT 1 or 2 signal status LED should be ON for a signal with a frequency in the
range of 1-50 MHz and a level greater than +7 dBm. Check at the end of the RF cable for
the proper level. If the signal meets the required level but the signal LED still shows a fault
the instrument will have to be returned for repair.
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