Telex Airman 850 Maintenance And Overhaul Manual page 30

30 Maintenance
5.1.3.2 Testing the Circuit Board Assembly
This test is for testing the circuit board assembly 600704-100 only. No testing is
IMPORTANT:
required for circuit board 800940-000.
RED
GREEN
COPPER
Airman 850 Headset, Boom Assembly Reference View
FIGURE 15.
To test the circuit board assembly, do the following:
1. Construct a test circuit. For more information, see Figure 16.
2. Connect the circuit board to the test circuit.
With Vin measuring 100mVRMS 1Khz, 
should read 210mVRMS ±60mV. 
V
OUT
If the output is outside this range, replace the circuit board
600 25uf
+
V IN
Airman 850 Headset, Circuit Board Test Diagram
FIGURE 16.
J2 J8
25uf
25 Vdc
DEVICE UNDER
TEST
220
J9
J3
Airman 850
.
470 1/2W
12 Vdc
V OUT