CCWN76:84 
                                                
STEP 5, Continued
TPlO, TPll: Set S2 to 10 bits/sec. The waveforms here will be
ramps
   which start at zero volts an go either up or down or remain
near
   zero. It is possible that either TP10 or TPll Tpll remain at
   zeros but if both remain at zero, the test fails. If one
remains
   at zero, the other should have a maximum height of either 500
   millivolts or negative 500 millivolts. The ramps will repeat
   lO times per second. Set the audio generator for 1000.2 Hz.
   Each ramp should now slowly increase and decrease in height,
   going from full negative 500 mv to full positive 500 mv, and
   as one output reaches its greatest positive or negative value,
   the other must pass through zero (flat, no ramp). Check IC13
   ICl4, IC12 and associated circuits.)
   
   If the maximum height of the ramp from one output is not
within
   10% of the maximum for the other, the component tolerance of
   R10 through R13 and C4 and C6 needs checking. The signal
levels
   through the two channels must be matched.
   
TP12, TP13: Set the scope sweep generator for 1 second/cm and the
   vertical amplifiers for 2 volts/cm. With the audio generator
   at 1000.2 Hz, watch for staircase waveforms stepping each 0.1
   seconds and producing a:stairstep approximation to a sine wave
   with a period of 5 seconds. The peak-to-peak amplitude of
these
   sinewaves should be about 10 volts. Check IC15, 16, and
associated
   components.
   
TPl2, TPl5: same as for TP12 and TP13. Check IC17 and components.

TP1, TP2: same as above, except that the polarity of the sinewave
   will be reversed every l millisecond, producing an envelope
   equivalent to a 500 Hz carrier being 100% modulated by a sine-
   wave with a period of 5 seconds. Check ICl9.
   
Now connect the audio amplifier to the filter output and check
for
   a steady 500 Hz tone accompanied by a slight clicking sound.
   Remove the audio generator input from the filter, and tho
output
   should disappear. Go to step 3 of the TEST SPECIFICATIONS.