EV-I Access Card
Access Card for Plug-In
Loudspeaker Diagnostics
User Instructions
Tools Required:
Instructions:
1.
#2 Phillips Screwdriver
2.
Ohm Meter capable of accurate
measurements below 50 ohms
#2
1. If applicable, remove screws holding the security cover, gland nut cover, or NL4 cover in
place.
Note position of the switch card. The card must be replaced in exactly the same
position as it was originally or system performance will be adversely affected!
2. Carefully remove the switch card and set it aside. Plug the Access Card onto the header in
place of the switch card. Note that the Access Card, unlike the switch card, will only fit in
one position centered on the input cup (See Figure 1).
3. Turn on the Ohm Meter and set it to the low ohms (x1) scale. Short the two probes togeth-
er and calibrate the meter to “Zero” (See Figure 2). If your meter does not have this calibra-
tion feature, note the ohms reading. This is the residual internal resistance of the meter,
probes and test leads. You will need to DEDUCT this number from the results you measure
at the Access Card.
The Access Card is a unique feature of the EV-Innovation series loudspeaker families. This
simple plug-in device allows diagnostic access to the transducers and protection circuitry
inside the enclosure WITHOUT requiring any disassembly or disconnections beyond simple
removal and replacement of the plug-in switch card. DCR values described in these instruc-
tions are typical for EV-I series two-way systems (eg: EVF-1122S/64).
For complete model-
specific DCR values, consult the chart on page 4.
Figure 1:
Switch Card Removal / Access Card Install
Figure 2:
Ohm Meter Calibration
Adjust
0.0
<50.0
