AMX TXC16 Plus Specifications download pdf (Page 195)

SG-2000 MANUAL 188

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

23.3.7 Speaker Level Check

Change the distortion analyzer to 0.3 VRMS range.

Adjust the audio generator for 100 mVRMS reading on the distortion analyzer.

Increase the audio volume to the maximum level.

Measure and record the voltage across the SPKR resistor with the oscilloscope.

Ensure the speaker is enabled, signal should be a clean sine wave:

SPKR = 8 Vpp to 10Vpp

If test failed, check for the following levels:

IC11 Pin 9 .05 Vpp

IC11 Pin 10 .05 Vpp

IC11 Pin 8 540 mVpp

IC16 Pin 8 540 mVpp

IC16 Pin 11 60 mVpp

IC20 Pin 2 5 mVpp

IC20 Pin 1 .5 Vpp

IC18 Pin 1 .3 mVpp

IC18 Pin 4 8-10 Vpp

23.3.8 Phone Level Check

Turn speaker off by pressing SPKR 4 key, increase volume to the maximum

level then measure and record the voltage across the FONE resistor with the

same 100 mV audio signal.

FONE = .6 to .8 Vpp

If test fails, check for the following levels:

IC19 Pin 9 .5 Vpp

R81 & C44 60 mVpp

IC17 Pin 3 40 mVpp

Output .6 to .8 Vpp

1 2 ... 190 191 192 193 194 195 196 197 198 199 200 ... 241 242

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AMX TXC16 Plus Specifications Page 195