Model 94x/97x Proximity Reader
Installation Manual
38
Troubleshooting the reader
If the operation of a component is in doubt, substitute a known
good component and retry the system. Always verify wiring
against wiring diagrams before powering up the system.
The troubleshooting guide is divided into three sections. The first
section is applicable to all installations, the second section
provides additional diagnosis for unsupervised readers, and the
last section provides additional diagnosis for supervised readers.
All installations
All LEDs are on and the beeper is on (if enabled): Usually, an
indication that the reader’s voltage is too low. This may be caused
if the wrong reader voltage is selected at the microcontroller or
the cable is too long between the reader and the microcontroller.
1. Measure the reader supply voltage at the microcontroller.
It should read between 12 and 15 VDC. If the voltage is
correct, continue to step 2 below. If the voltage is
incorrect, refer to the appropriate microcontroller manual
and correct the voltage.
2. Set the reader to low power mode if the cable distance is
too long (See Table 1 “Power level switch settings,” on
page 24). This may correct the problem.
3. If the problem is still present, while in low power mode,
measure the voltage between J1 pin 1 (power) and J1 pin
2 (ground). This voltage should be greater than 8 VDC
and less than or equal to the reader supply voltage. If the
voltage is too low, correct the wiring. If the voltage is
correct, replace the reader.
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