NVision NV1023, Инструкция по эксплуатации

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10 NV1023 SDIF-2 Distribution Amplifier
cables for continuity or short circuits.
b. If the steps above indicate that the fault is in the NV1023
module or backplane, place the active module on an NVISION
extender module (Model Number NV10XX) for further testing.
Otherwise, return the module to NVISION for testing and
repair.
c. With an oscilloscope or a hand-held digital voltmeter, check first
for +5 VDC on test point TP2 using TP3 as a ground reference
point. If the indicated voltage is not present, ensure that +17
VDC ± 10% appears on the right side of capacitor C18 when
viewed from the component side of the module with the front
edge of the card to your left. If these voltages are not present,
find the faulty component or connection and replace or repair it.
d. If the proper voltages are present on the module, trace the
digital audio signal through the module using an oscilloscope
and probing test point TP1, the signal pins of U2 and U3, and
other components in the signal path. Isolate the faulty
component and replace it, or return the module to NVISION
for repair if you find that it is faulty.
NVISION Technical Support can be reached in California at +1 (916)
265-1000 between the hours of 8 am and 5 pm Pacific Standard Time.
6. DRAWINGS AND SCHEMATICS
Table 3 - Acceptable Test Point Voltages for PS2001 Power Supplies
PS2001 Test
Points
Loaded Frame (One or More
NV1000 Modules Installed)
Unloaded Frame (No NV1000
Modules Installed)
±7 VDC 6 < IVI < 8.5 7 < IVI < 10*
±17 VDC 16 < IVI < 18.5 17 < IVI < 22*
* When unloaded, the upper voltage limit may exceed the value shown.