Pal-S Killer Level Adjustment (Bd Board); Pal Video Out Level Adjustment (Bd Board); Pal-D Burst Gate Pulse Adjustment (Bd Board) - Sony BKM-21D Maintenance Manual

3-3-9. PAL-S KILLER Level Adjustment
(BD Board)
n
The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu.
KILLER LEVEL
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Set 02 CH.
3. Set the KILLER LEVEL data to 30.
4. Attenuate the input signal by 10dB
5. Connect the oscilloscope to Pin !; of IC802 (KILL-
ER-IN) of the BD board.
(DC 1 V/div)
6. Gradually increase the KILLER LEVEL data until the
DC voltage of Pin !; changes from 5 V to 0 V.
3-3-10. PAL VIDEO OUT Level Adjustment
(BD Board)
n
. For this adjustment, install the NTSC input adapter
BKM-25P to the vacant slot.
. The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu.
V LEVEL (VIDEO LEVEL)
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Connect the oscilloscope to TP101 of the BD board.
3. Adjust the V LEVEL (VIDEO LEVEL) data so that
the V I/O signal level A of TP101 satisfies the specifi-
cation.
A
Specification A = 700 ± 10 mV
Fig. 3-10
BKM-21D
3-3-11. PAL-D Burst Gate Pulse Adjustment
(BD Board)
n
The following adjustment menu is below the BKM-21D
menu of the MAINTENANCE menu.
BGP-P (BURST GATE PULSE-POSITION)
BGP-W (BURST GATE PULSE-WIDTH)
1. Input the composite PAL 100% color bar signal into
the VIDEO 4 input terminal.
(Full-field 0% set up)
2. Set 02 CH.
3. Connect the CH1 probe of the oscilloscope to Pin 7
of IC325 of the BD board, and connect the CH2 probe
to TP311 of the BD board.
4. Adjust the BGP-P (BURST GATE PULSE-POSI-
TION) data so that the position A of the burst gate
pulse satisfies the specification.
5. Adjust the BGP-W (BURST GATE PULSE-WIDTH)
data so that the width B of the burst gate pulse satisfies
the specification.
APC PB OUT
(IC325-7)
Burst gate pulse
(TP311)
Enlargement
APC PB OUT
a
Burst gate pulse
a = b
Specification A = 2.5 ± 0.1 usec
Specification B = 5.0 ± 0.2 usec
Fig. 3-11
A
b
B
3-17 (E)