19
2 SUBSYSTEM ADJUSTMENT & TROUBLE SHOOTING
2-1 MICROPHONE AUDIO
2-1-1, VOLTAGE CHART
NOTE: On the unit under test the +250-volt buss actually measured 315vdc. It is not uncommon for the 250vdc buss to
run from 300 to 330vdc with AC line voltages between 120 and 124vac.
V2
V1B
V5
1 57v/(50v STBY)
5 260v/(227 AM KEYED)
1 260V/(227 AM KEYED)
2 0.0
7 0.0
2 0.0
3 0.34
8 2.6v/(3.0v STBY)
3 2.0
6 60v/ (160 STBY)
/ ////////////////////////////////////////////
6 260/(227 AM KEYED)
7 -0.7v/(140v CW)
/ ////////////////////////////////////////////
7 0.0
/
///////////////////////////////////////////
/ ////////////////////////////////////////////
8 2.0
2-1-2, SIGNAL LEVEL CHART
Inject 12mvpp, 1000Hz @ test point
A
.
Measurement taken in MOX, AM, mic keyed, MIC GAIN adjust for 90 to 95% modulation.
B
C
D
E
F
0.012vpp
0.39vpp
3.9vpp
1.0vpp
1.0vpp
2-1-3, REFERANCE VOLTAGES
Test point
G
Test point
H
0.0/(-130 CW)
260vdc
