Performance Verification and Adjustment Procedures
TSG 90 PATHFINDER Service Manual
3–4
Performance Verification Procedures
NOTE
. After initial delivery or long storage, allow a two-hour warm-up time to
re-age the crystal. Thereafter, a 20 minute warm-up time is sufficient.
1. Check Subcarrier Frequency
a. Connect the PATHFINDER Video Output to the genlock input of the
NTSC Test Signal Generator with a 75
Ω
coaxial cable. Terminate the
genlock input in 75
Ω
, if required.
b. Connect the NTSC Test Signal Generator subcarrier output to the
Frequency Counter A input, using a 75
Ω
coaxial cable.
c.
Connect a reference, such as WWV, to the B input of the Frequency
Counter.
d. Set the Frequency Counter for a ratio of A/B, and set the AVG to 106.
e.
CHECK — that the measured oscillator frequency is 3.579545 MHz
±
10
Hz.
2. Check Blanking Level
a. Connect the PATHFINDER Video output to the 1780 A Input and
terminate the loop-through in 75
Ω
.
b. View the Ch A signal on the 1780 waveform display.
c.
Select the 5-Step signal from the PATHFINDER (press G).
d. CHECK — that the test signal DC level is at 0 V
±
50 mV.
3. Check Sync Amplitude
a. Continue from the preceding step, with the PATHFINDER 5-Step signal
on the 1780 waveform Ch A.
b. Using the WFM + CAL function of the 1780, match the DC level of the
lower displayed waveform to the sync tip of the upper waveform.
c.
CHECK — that the sync amplitude is 285.7 mV
±
5.7 mV (40 IRE
±
0.8
IRE).
Oscillator Frequency
Test Signals
Содержание TSG 90 PATHFINDER
Страница 4: ...ii TSG 90 PATHFINDER Service Manual...
Страница 10: ...viii TSG 90 PATHFINDER Service Manual...
Страница 11: ...Specifications...
Страница 12: ......
Страница 22: ...Specifications 1 10 TSG 90 PATHFINDER Service Manual Figure 1 2 75 Color Bars Figure 1 3 Red Field...
Страница 23: ...Specifications TSG 90 PATHFINDER Service Manual 1 11 Figure 1 4 SIN X X Figure 1 5 5 Step Staircase Gray Scale...
Страница 24: ...Specifications 1 12 TSG 90 PATHFINDER Service Manual Figure 1 6 0 IRE Flat Field Figure 1 7 50 IRE Flat Field...
Страница 25: ...Specifications TSG 90 PATHFINDER Service Manual 1 13 Figure 1 8 Black Burst Figure 1 9 Field Square Wave...
Страница 26: ...Specifications 1 14 TSG 90 PATHFINDER Service Manual Figure 1 10 Multiburst Figure 1 11 Convergence Components...
Страница 27: ...Specifications TSG 90 PATHFINDER Service Manual 1 15 Figure 1 12 NTC7 Composite Figure 1 13 NTC7 Combination...
Страница 28: ...Specifications 1 16 TSG 90 PATHFINDER Service Manual Figure 1 14 FCC Composite Figure 1 15 Matrix...
Страница 29: ...Specifications TSG 90 PATHFINDER Service Manual 1 17 Figure 1 16 Safe Area...
Страница 30: ...1 18 TSG 90 PATHFINDER Service Manual...
Страница 31: ...Operating Information...
Страница 32: ......
Страница 38: ...Operating Information 2 6 TSG 90 PATHFINDER Service Manual...
Страница 39: ...Performance Verification and Adjustment Procedures...
Страница 40: ......
Страница 53: ...Maintenance...
Страница 54: ......
Страница 62: ...4 8 TSG 90 PATHFINDER Service Manual...
Страница 63: ...Replaceable Electrical Parts...
Страница 64: ......
Страница 75: ...Diagrams Circuit Board Illustrations...
Страница 76: ......
Страница 79: ...Diagrams Circuit Board Illustrations TSG 90 6 3 TSG 90 Block Diagram...
Страница 81: ...0 0 0 0 0 0 0 0 0 0 4 2 4 2 0 0 0 0 0 2 3 0 1 0 TSG 90 KEY BOARD 1 2 A2...
Страница 83: ...TSG 90 CPU CLOCK TIMING DIGITAL AND ID GENERATION 1 A1...
Страница 86: ......
Страница 87: ...Replaceable Mechanical Parts...
Страница 88: ......
Страница 93: ...TSG 90 PATHFINDER Service Manual 7 5 A1 A2 FIG 1 EXPLODED VIEW A3...
Страница 94: ...TSG 90 PATHFINDER Service Manual 7 6...