Radio Systems TR-6000, Operating Instructions Manual

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R a d i o S y s t e m s , I n c . T R - 6 0 0 0 M a n u a l
P a g e 1 0
TR-6000 Test Procedure
1. Check the circuit board for solder shorts and bad solder joints.
2. Check the alignment of the terminal strips, headphone jack and potentiometers.
3. Check for proper installation of diodes, transistors and IC’s.
4. Set all potentiometers except VR10 and VR11 to their center position.
5. Set potentiometers VR10 and VR11 fully counter clockwise.
6. Install a jumper on J7 for “power LED independent of metering.”
7. Install a jumper on J5 for “TIS filter disabled.”
8. Install a power jumper on J13.
9. Remove U12.
10. Set dip switches S1, S2 and S3 for the desired output frequency.
11. Apply power to the unit and check for the power LED to illuminate.
12. Check the output of the variable regulator, twenty volt regulator, twelve volt regulator and the five
volt regulator.
13. Install jumpers J8, J10, and J11 for “standard oscillator” and “no I/O.”
14. Measure the oscillator frequency at U11 pin 13.
15. Adjust C57 for an oscillator frequency of 10 MHz.
16. Turn off the power and install U12.
17. Connect an RF load to the RF output.
18. Power up the unit and check Test Point A for the carrier frequency (riding on a 5 volt DC level).
19. Adjust VR8 for a 45% duty cycle square wave at Test Point D.
20. Adjust VR9 for a 45% duty cycle square wave at Test Point B.
21. Adjust VR1 for 10 volts on the drain of Q6.
22. Adjust VR7 for 5 volts on the center tap of T3. (Should be 1/2 of Q6 VDD. A lower reading
improves unit distortion; a higher reading increases power output for a given Q6 VDD.)
23. Adjust C123 for maximum power output.
24. Increase VR10 and VR11 until the bottom half the gate signals of Q8 and Q9 are just below 0
volts (Test Points C & E).
25. Increase VR1 to its maximum position and adjust VR2 for the desired maximum power (not to
exceed 30 watts).
26. Install a power jumper on J14 and calibrate the RF power meter with VR13.
27. Apply a -50 dBm, 1 KHz audio signal to J4 +/-.
28. Adjust VR3 fully clockwise.
29. Adjust VR4 for maximum modulation.
30. Turn VR3 counter clockwise to reduce modulation percentage and readjust VR4 for maximum
modulation.