Atec Tektronix-1502 - Manual (Page 46)

TM 9-4935-601-14-3&P
Adjustment Procedure
Figure 4-5. Power Supply Test Points And Adjustments.
24 (a). Locate the pulse with the ZERO REF control at the center of the graticule.
(b). Adjust-INTENSITY LIMIT (R4222) for 100 mVdc reading at test point TP4243 to gnd
(option 1: 60 mV). The adjustment is made through the hole near Q6427 on the power supply
board (see Fig. 4-6).
25. Set the front panel FOCUS control for the clearest possible trace.
26. Adjust-R3242 (AST) located on the OUTPUT AMPS board, and the front panel FOCUS control until the
clearest possible trace, both vertically and horizontally, is obtained.
27. Remove the precision 50
Ω
cable.
Trace Rotation
28. Set the mp/DIV control to 200.
29. Turn the ZERO REF SET fully clockwise and adjust the POSITION controls so that the trace is located
on the horizontal centerline.
30. Check-that the trace aligns with the horizontal centerline.
31. Adjust-R3143 (ROT) located on the OUTPUT AMPS board, so that the trace aligns with the horizontal
centerline.
Trace Geometry
32. Move the trace with the POSITION control so that it is located 3 divisions below the horizontal
centerline.
33. Check-that the trace aligns with the graticule line within 0.1 division.
34. Move the trace with the POSITION controls so that it is located 3 divisions above the horizontal
centerline.
REV B FEB 1980
4-8