Tektronix TSG 95, Service Manual

Page: 102 / 140

Performance Verification and Adjustment Procedures
4–28
TSG 95 Service Manual
The following three adjustments are typically within spec if the entire adjustment
procedure has been followed. The adjustments that can be made in the next three
steps are interactive with the PAL adjustments, and therefore should only be
readjusted if they are out of specification.
10. Adjust NTSC Multiburst
a. Change the TSG 95 video standard to NTSC and select the Multiburst
signal (Press J).
b. Press the following VM700A keys: Measure, <Video Standard>, and
<MultiBurst>.
c. Press the Move-Expand key. Expand the signal by rotating the knob
clockwise until the VM700A “clicks.” Press the Move-Expand button
again.
d. Rotate the knob counterclockwise to bring the Multiburst packets to cen-
ter screen.
e. Press the Average key.
f. CHECK — that all packets have a variance within
±
0.14 dB.
ADJUST — L7, C6, and R71 only if the specification is not met.
11. Adjust NTSC Chrominance-to-Luminance Gain and Delay
a. Select the NTC7 Composite signal from the TSG 95 (press K).
b. Press the following VM700A keys: Measure, <ChromLum GainDe-
lay>, Average, and Select Line.
c. Select line 25.
d. CHECK — that Gain is 100
±
1.5%, and Delay is
≤
10 ns.
ADJUST — L7 and C6 only if the specifications are not met.
12. Adjust NTSC SCH Phase
a. Select the NTSC Composite signal from the TSG 95 (press K).
b. Press the following VM700A keys: Measure, <SCH _Phase>, and Av-
erage.
c. CHECK — that the SCH Phase is 0
° ±
4
°
.
ADJUST — L7 only if SCH Phase is not within specification.
13. If any adjustments were made in steps 10 through 12 then repeat those three
steps until no adjustment is necessary.
14. If any readjustments were made in step 13 then repeat steps 5 through 14
until no readjustments are necessary.
NTSC Video Filter
Adjustments