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Performance Check and Calibration Procedures
1–26
TPG20 Service
o. Set TPG20:
FORMAT 625/50 COMPONENT RGB
Groups: FLAT FIELDS; WHITE 100% 625 RGB
p. Adjust – RV12 for minimum run through of the two signals as observed
on the oscilloscope. (note: this adjustment has no effect if precision
crystals are installed).
q. Using the TPG20 SYSTEM button, select ”Factory Presets”, then press
the SELECT button. This will restore the crystal settings to their initial
settings.
r. Set TPG20:
FORMAT 625/50 COMPOSITE PAL/D2
Groups: BARS; EBU COLOR BARS 625 PAL/D2
s. Set TPG20 Genlock to On. Select Lock on: SC–Phase Lock. Verify that
genlock occurs within 20 seconds and the Genlock light is on (not
blinking).
t. Monitor the signal at pin 11 of N141 with a probe attached to CH 2 of
the oscilloscope.
u. Adjust – RV11 for a 1/2 line–rate square wave, centered about 0V DC.
12. Genlock SECAM
NOTE. A SECAM signal source is required for this adjustment. This should be
available locally if the SECAM format is actually being used. Otherwise, it
should not be necessary to perform this adjustment
a. Using a SECAM source signal, loop through the Reference Input on the
TPG20 to CH 1 on the oscilloscope.
b. Examine the signal on pin 3 of N135 using a probe on CH 2 of the
oscillocope.
c. Adjust – LV11 to obtain a pulse every 2 lines of SECAM.
END OF ADJUSTMENT PROCEDURE