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Amplifier Test Procedure
TEST EQUIPMENT
Audio generator/analyser
Oscilloscope
Voltmeter
2 load resistors 16 ohm, 200W
1 load resistor 8 ohm, 100W
Variac with voltage and current-draw meters
1 INSPECTION
1.1 Inspect all components, solder, wires, connectors, screws, heatsink screws. Make
sure all transistors and IC amps are secured correctly to the heatsink.
2 CONNECTIONS
2.1 Connect the two 16 ohm loads to the Low and High outputs (Low+ Low- and Hi+ Hi -).
2.2 Connect the 8 ohm load to the Mid outputs (Mid+ and Mid -).
2.3 Connect the audio generator's output to the XLR input of the SR1530.
2.5 Initially connect the analyser and scope to the 16 ohm load on the Low Freq section.
2.6 Connect the variac to the AC connector of the SR1530.
2.7 Set the frequency to 200 Hz, at minimum output.
2.8 Turn on the SR1530 Power Switch
3 POWER UP
3.1 Slowly bring the Variac up to 115 Vac (230 Vac for European models).
3.2 Verify that the green led is illuminated.
3.3 Verify an ac current draw of: 340 mA ± 10 % (115 Vac)
3.4 Verify with a DC voltmeter the values of the two DC rails (± 25 Vdc; ± 50 Vdc)
with a tolerance of approx 1.5 Vdc for the 25V rail and approx 2 Vdc for the
50V rail.
6
NOTE: The amplifiers are
operated in mono, so the negative
output terminals must not be
grounded by your test equipment.
Use an oscilloscope in Differential
mode.
170 mA ± 10 % (230 Vac).
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