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1. Set the REFERENCE REMOTE/LOCAL selector
switch on the AT-141 board panel to LOCAL.
2. Select the type of external sync signal using the
REFERENCE SIGNAL selector switch on the AT-141
board panel.
HD : HD ternary SYNC
BB : BB (black burst) signal
Factory setting : HD
3. When setting HD in step 2:
1) Coarse-adjust the H phase using switch S127 (H-
PHASE COARSE) on the AT-141 board, then
fine-adjust it using the H PHASE FINE control on
the AT-141 board panel.
When selecting BB in step 2 :
1) Coarse-adjust the H phase using switch S127 (H-
PHASE COARSE) on the AT-141 board, then
fine-adjust using the H PHASE FINE control on
the AT-141 board panel.
2) Adjust the SC phase using switch SC PHASE on
the IF-789A/789P board (HKCU-901) panel
(when the BB signal is selected as a reference).
n
When using 10F-BB (NTSC 10-field sequence BB) of
SMPTE318M as BB, the frame sequences of the 30 Hz
frame frequency and the 24 Hz frame frequency can be
locked by setting switch S122 (10F-BB) on the AT-
141 board to ON.
HDCU-900 IMM
2-4-3. Level Adjustment of the VBS Signal
(only when HKCU-901 is installed)
Adjust the level of the VBS signal output from the unit
using the color bar signal.
Use the switch on the IF-789A/789P board (HKCU-901)
and the control on the panel of the unit for adjustment. The
adjustment also can be performed on the maintenance
menu of the MSU-700A/750. For more details, refer to the
System Manual.
How to adjust using the IF-789A/789P board
(HKCU-901) of the unit
S708
9
8
7
6
IF
BB
REFERENCE
POWER
REF IN
SC PHASE
VBS LEVEL control
VBS CHROMA control
VBS SYNC control
IF-789A/789P board (A side/panel side)
1. Set switch S708-1 on the IF-789A/789P board to ON.
Factory setting : OFF
2. Press the BARS button of the MSU-700A/750, RCP-
700 series, etc. to display the color bars on the wave-
form or vector monitor.
2-4. Video Signal System
5
4
3
2
1
VBS
RGB LEVEL
LEVEL
CHROMA
SYNC
2-23 (E)
F
G
H
J
K
L
M
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