Vertex Standard VX-900 - Manual (Page 25)

25
Test Adapter Schematic
Connector Pinout Diagram
AF Test Adapter Schematic
Note!
Because of the bridge audio amplifier circuit used in the VX-900, it is necessry to construct
and use a simple audio load test adapter as shown in the schematic diagram above, when con-
ducting receiver alignment steps.
Do not connect either side of the speaker leads to chassis "ground."
YAESU P/N: T9206933
White (Pin 1: Speaker +)
Blue (Pin 2: Speaker -)
Red (Pin 4: MIC)
Green (Pin 5: Select)
N.C. Yellow (Pin 7: Clone)
Shield (Pin 3: GND)
16-ohm
2w
220µF
+
+
220µF
+ 1µF
2.2K-ohm
PTT
AF Output
Audio Generator
Attenuated
Test Output (1/2)
Pin 2 (Speaker -)
Pin 4 (MIC)
Pin 1 (Speaker +)
Pin 3 (GND)
Pin 5 (Select)
Pin 7 (Clone)