JBL VTX Series User Manual

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JBL VTX Series User Manual Manual pdf 34 page image

34VTX A 8 | User ManualPins Section DCR TolerancePins 1 & 2 LF Right 10.1 Ω +/- 0.2 ΩPins 7 & 8 LF Left 10.1 Ω +/- 0.2 ΩPins 3 & 4 MF Right 12 Ω +/- 0.2 ΩPins 9 & 10 MF Left 12 Ω +/- 0.2 ΩPins 5 & 11 HF 1 20 Ω +/- 0.2 ΩPins 6 & 12 HF 2 20 Ω +/- 0.2 Ω1 2 3 4 5 67 8 9 10 11 1213.1 - TESTING INDIVIDUAL COMPONENTSTesting the individual sections of an A8 enclosure requires removing the input panel and bypassing the passive network. To do that firstremove the 10 x T15 screws holding the panel, and then slide the input panel out of the A8 enclosure. Once the panel has been removed,disconnected the MolexTM connector from the board as illustrated below.The MolexTM connector includes 12 connection pins which can be used to test the individual sections of the A8 speaker using a DMM.The pin assignments of the MolexTM connector are listed below and note that the locking tab of the connector should be oriented facingup. The test leads of a DMM can be inserted in the connector pins to take the measurements. The DCR values of each section shouldbe within tolerance of the values listed below. Since each pair of MF transducers are wired in series, if an open (overload) is measured,one or both of the transducers might be defective.TOOLS REQUIRED: A TORX size 15 screwdriver is required to remove the screws holding the input panel onto the A8enclosure. A high-quality Digital Multi Meter is required for measuring the transducers.