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RET-041 Instructions
95307-000-01 6/87
Equipment required:
Low-frequency spectrum analyzer with tracking generator
Tektronix 5L4N plug-in with 5111 bistable storage mainframe, or equivalent. Alter
natively, a sweep generator with 20-20, 000Hz logarithmic sweep can be used with
the oscilloscope in X/Y mode).
Oscilloscope
With DC-coupling, dual trace, triggered sweep, and 5MHz or greater vertical band
width. x 10 probe.
Audio oscillator
Residual distortion less than 0.0015%.
Frequency counter
Accurate to ±0.05%
Total harmonic distortion THD) analyzer
Residual distortion less than 0.0015%.
Audio voltmeter
Accurate to ±2%. Sound Technology 1700 A/B or 1710, for example.)
Pink noise generator
Digital voltmeter
Accurate to ±0.1%.
It is assumed that the technician is thoroughly familiar with the o eration of this equi
ment.
1) Open the front panel of the OPTIMOD-AM, remove the subpanel.
It is not necessary to remove the unit from the rack, as long as you have access to the input
terminals on the rear panel. The OPTIMOD-AM must, however, be off the air during this
procedure.
a) Remove the three hex-socket screws at the top of the front panel with a %4-inch hex
wrench provided with the unit), then tilt the hinged front panel downward to reveal
the interior.
b) Loosen the four DZUS fasteners on the subpanel by turning each V 4 -tum counterclock
wise with a long 3 /i6-inch or y 4 -inch flat-blade screwdriver.
c) Taking care not to stress the flat cables beneath it, tilt the top of the subpanel outward
and to the left to clear the upper chassis lip and the door support rail at the right.
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