Adjustment Procedure:
5–2
SPG 422 Service Manual (B034000 and above)
Table 5–4: Black burst sync adjustment
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Signal
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
Adjustment
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 1
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
C143
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Black 2
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
C136
Table 5–5: Subcarrier and SCH phase adjustment for Option 1
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
Channel
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Subcarrier level
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
SCH phase
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
Black 3
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
C25
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L2
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
Black 4
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
C44
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L8
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
Black 5
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
C82
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L20
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
Black 6
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
C63
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
L14
Adjustment Procedure
1. +5 V Power Supply Adjustment (R415)
a. Connect the line voltage to the SPG 422.
b. Turn the instrument on.
c.
Connect a probe at TP140 and use a DMM to check for +5 V
"
100 mV.
d. If the +5 V is out of specification, adjust R415 until it is within
specification.
2. Fine Phase Filter Adjustment
a. Set the Diagnostic Switches (S1) to 31 hex (001100001 closed = 1).
b. Connect a spectrum analyzer to TP10 (Black 1 on the Digital board)
using a 500 Ohm probe.
c.
Center the spectrum analyzer display around the 27 MHz carrier and set
the display for 10 dB/division. The carrier should have sidebands spaced
at 105 kHz intervals.
d. Adjust C229 to null the 105 kHz sidebands.
e.
Change the display to 2 dB/division.
f.
Adjust the reference level of the spectrum analyzer to view the carrier.
g. Adjust C230 for maximum carrier amplitude. (Center the LC resonator
around 27 MHz clock.)
Summary of Contents for SPG 422
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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 ...
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Page 223: ...9 3 SPG 422 Service Manual SPG 422 Component Digital Sync Generator FRONT PANEL 1 ...
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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 ...
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