User's Manual

7. TROUBLESHOOTING
This section includes voltages, which should assist the engineer to isolate and repair a fault.
Voltage measurements should be made using a high-impedance voltmeter and the values given are with
respect to ground.
Careful alignment, using suitable test equipment, and quality interface cables should ensure that the radio
meet their specified performance.
Voltage Charts
Measurement Condition: 162.8750MHZ, 13.8V supply, RX Carrier Present.
Transistors.
RX TX
Ref. No.
B C E B C E
Q2 15.72 5.67 15.88 15.72 5.33 15.88
Q4 0 5.67 0 0 5.33 0
Q6 4.02 0 4.14 4.02 0 4.14
Q8 0.48 1.96 0 0.48 1.96 0
Q9 4.81 5.02 4.14 4.81 5.02 4.14
Q10 3.77 15.28 3.66 3.77 15.28 3.66
Q11 6.68 0 6.82 0 5.61 6.66
Q12 0 6.68 0 0.72 0 0
Q14 4.63 0 5.03 4.3 4.92 5.02
Q15 0 4.86 5.02 5.02 0 5.02
Q16 2.63 4.98 1.86 2.63 4.98 1.86
Q17 0.89 1.7 0.12 0.89 1.7 0.12
Q18 0 0 0 0 4.76 4.90
Q19 0 13.8 0 1.16 12.8 0.63
Q21 0 0 0 0.43 2.05 0
Q22 0 0 0 2.53 4.72 2.05
Q23 13.72 0 13.8 13.25 4.49 13.8
Q24 0.7 3.94 0 0 0 0
Q25 0.68 0 0 0 7.73 0
Q31 5.0 0 0 5.0 0 0
Q32 5.0 0 0 5.0 0 0
Q33 5.0 0 0 5.0 0 0
Q34 0 0 0 0 0.72 0
Q35 0 0 0 0.72 0 0
Q502 4.38 5.04 5.06 4.38 5.04 5.06
Q503 0.74 0 0 0 5.05 0
Q505 0 4.65 0 0.72 0 0
Q506 13.22 7.5 13.8 13.22 8.24 13.8
Q507 0.11 11.92 0 0.03 10.6 0
Q508 0.57 0.11 0 0.51 0.03 0
Q509 0 0 0 5.0 0 0
Q512 5.0 0 0 0 0 0
PAGE 17