Tektronix 1705A - Manual (Page 112)

Checks and Adjustments
1705A Spectrum Monitor 5- 17
Adjustment Procedure
The Adjustment Procedure covers only adjustments. Checks, other than those
that must be made to ensure a step is completed, are in the Performance Check
Procedure.
There are actually two Adjustment Procedures, the short-form version is
provided for those familiar with the adjustments, while the longer (more
detailed) procedure is provided for those who need it.
Allow 20 minutes of warm-up time, at normal room temperature (approximately
25
° C) before making any adjustments to the instrument.
The Short-Form Adjustment Procedure has the adjustment steps in the same
order as the longer form of the procedure, so the Short-Form Procedure can be
used as an index for the Long Form. Circuit numbers for parts adjusted in the
step are also included with the step title.
A1 POWER SUPPLY BOARD
1. Adjust +5 V (R99)
2. Adjust CRT Bias (R58)
3. Adjust Geometry (R45), Center Focus (R11) and Astigmatism (R49)
4. Adjust Trace Rotation
A3 MAIN BOARD
5. Adjust On-Board Regulated Power Supplies (R99, --11.8V; R111, +11.8V)
6. Adjust Horizontal Gain (R168)
7. Adjust Readout Position (R27, Horizontal; R29, Vertical)
8. Adjust 360/119.8 MHz L.O. (C55, C69, L4, FL1, and FL2)
9. Adjust Ramp Size (R113)
10. Adjust 70 MHz Band Linearity (R55, R49, R56, R48, and R57)
11. Adjust 10 kHz Filter (C52, C62, C64, and R175)
12. Adjust L-Band Linearity (R35, R51, R58, R75, R81, and R82)
13. Adjust Readout Range (R4)
14. Adjust Span/Div Magnification Registration (R27)
Short- Form Procedure