Adjustment Procedure:
5–6
SPG 422 Service Manual (B034000 and above)
6. Subcarrier and SCH Phase Adjustment (Option 1 only)
a. Set up the equipment as shown in Figure 5–1, except connect Black 3 to
CH A, Black 4 to CH B1, Black 5 to CH B2, and Black 6 to CH B3.
b. Use the SPG 422 front-panel menu change the Black 3 output to PAL.
c.
View the Black 3 signal CH A on the 1781 PAL vectorscope/waveform
monitor.
d. Adjust C25 for proper subcarrier amplitude (300 mV
p-p
±
15 mV) and
L2 for zero SCH Phase (0
°
±
5
°
). (Repeat as necessary, because these
adjustments interact.)
e.
View the Black 3 signal on the 1780 NTSC vectorscope/waveform
monitor.
f.
Use the SPG 422 front-panel menu to change Black 3 to output an
NTSC signal.
g. Check that the subcarrier level is 40 IRE
p-p
±
2 IRE and the SCH Phase
is 0
° ±
5
°
.
h. Adjust C25 and L2 until both NTSC and PAL subcarrier specifications
are met.
NOTE
. C25 has a gain effect on both NTSC and PAL subcarrier levels, while L2
can be used to trade off gain between NTSC and PAL for their SCH perfor-
mance.
i.
Repeat procedure with Black 4 through Black 6 output, using the list
below:
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
Channel
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
Subcarrier level
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ
SCH phase
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 3
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
C25
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L2
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 4
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
C44
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L8
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 5
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
C82
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L20
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 6
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
C63
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L14
Summary of Contents for SPG 422
Page 4: ......
Page 14: ...Service Safety Summary x SPG 422 Service Manual B034000 and above ...
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Page 96: ...Performance Verification 4 4 SPG 422 Service Manual B034000 and above ...
Page 102: ...Performance Verification 4 10 SPG 422 Service Manual B034000 and above ...
Page 136: ...Performance Verification 4 44 SPG 422 Service Manual B034000 and above ...
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Page 158: ...Maintenance 6 14 SPG 422 Service Manual B034000 and above ...
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Page 223: ...9 3 SPG 422 Service Manual SPG 422 Component Digital Sync Generator FRONT PANEL 1 ...
Page 224: ...SPG 422 Service Manual 9 4 ...
Page 226: ...SPG 422 Service Manual 9 6 A2 Digital Board Static Sensitive Devices See Maintenance Section ...
Page 227: ...9 7 SPG 422 Service Manual SPG 422 Component Digital Sync Generator CPU 1 ...
Page 228: ...SPG 422 Service Manual 9 8 A7 Serial Filter ...
Page 229: ...9 9 SPG 422 Service Manual SPG 422 Component Digital Sync Generator CPU I O 2 ...
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