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4-4. FM-81 Board Adjustment
4-4-2. SCH DET Adjustment (625/50 mode)
Preparation
. Connect the black-burst signal "SCH: 0d" to the REF-
ERENCE IN connector on the rear panel.
. Set the setup menu "010-525/625" to "625/50".
n
Refer to the MAV-555A Installation Manual for the
operating procedures.
. Turn off the main power once then back on.
n
To restart quickly, execute the setup menu item [027-
FAST REBOOT].
Connection
SG1 : TSG-130
(TSG-131)
FRAME REF
SG2 : 1410
(1411)
GEN LOCK
CH-2
CH-1
Oscilloscope
A
B
C
1
1
RV801
TP780
2
3
4
5
6
4-6 (E)
COMPOSITE
A
Vector-
B
monitor
J1
TP780
REF
MAV-555A
D
E
F
FM-81 board (A side)
Adjustment Procedure
1. Set up the measurement equipment as follows :
. Vectormonitor :
SCH mode, INPUT : CH-B, EXT REF
. Signal generator SG2 (1411) :
Synchronization : GEN LOCK
2. Adjust the PHASE knob of a vectormonitor to adjust
the sync phase to 0d.
3. Change the vectormonitor setting as follows.
INPUT : CH-A
4. Adjust the HORIZ DELAY knob of a signal generator
SG2 to adjust the sync phase to 0d.
5. Set up an oscilloscope as follows:
CH-1 : TP780 (A-1)/FM-81 Board, DC 2 V/DIV
CH-2 : FRAME REF/SG1 (TSG-131), DC 5 V/DIV
TIME : 20 ms/DIV
TRIG : CH-2 (_slope)
6. Turn the RV801 (A-1)/FM-81 board fully counter-
clockwise (3).
7. Turn the RV801 slowly clockwise (2) until the
oscilloscope CH-1 waveform appears in the field 1.
2-Frame
FRAME REF
TP780
(Field 1)
(Field 3)
MAV-555A
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