SERVICE MANUAL - Nexo

NXAMP4x45. Inspection with BRIDGE modeCondition:• Perform each test item in this section with the bridge test mode of the test program. (See “TEST PROGRAM 4-16.BRIDGE test”)• Connect individually the 16 Ω load resistor to channel 1 and channel 3 output terminals.• Keep the measurement reference of the measuring instrument in floating condition and connect it to the middle point ofeach load resistor.• Do not connect any resistor to channel 2 and channel 4 output terminals.• The input terminals and output terminals of channel 2 and channel 4 are not used in this section.5-1. GainInput the 1 kHz, 0 dBu sine wave to each input terminal and check that the output voltage obtained at each output terminalis +34.1 ±1.2 dBu.5-2. Frequency responsePerform the following test at each channel.Input the 10 Hz, 1 kHz, 20 kHz, 0 dBu sine wave to the input terminal and one by one measure the output voltage obtainedat the output terminal for each frequency.Confirm the output voltage at 10 Hz is 0 ±0.5 dB when compared with the output voltage at 1 kHz (0 dB).Confirm the output voltage at 20 kHz is +0.5 ±0.5 dB when compared with the output voltage at 1 kHz (0 dB).6. Confirming operation of NX-DFLT cardTurn off the power, and insert the NX-DFLT card into the expansion slot. Turn on the power, and confirm that an indicator (LED)of the NX-DFLT card lights.Turn off the power.Note: Be sure to turn off the power before inserting the NX-DFLT card.82