Sony DNW-A100 Maintenance Manual page 23

1-7-7. CP-277 Board
Perform the following check after replacing or repairing
this board.
Preparing tools
. Analog composite video signal generator:
TEKTRONIX TSG-170A or equivalent
. Analog component video signal generator:
TEKTRONIX TSG-300 or equivalent
(It is required only for the VTR with BKNW-104.)
. Analog composite waveform monitor
DNW-A100/A50/A45:
DNW-A100P/A50P/A45P: TEKTRONIX 1751, 1781R,
. Analog component waveform monitor:
TEKTRONIX WFM300 or equivalent
. Analog component video monitor
Used for displaying of the menu. Usually, connect it to
VIDEO OUTPUT COMPOSITE 3 (SUPER) connector.
. 75 Z terminators (4 pieces.)
Preparations
1. Set the following switches on the sub control panel.
OUT REF switch:
CHARACTER switch: ON
2. Set the operation system in the VTR using the setup
menu ITEM-013 as follows:
DNW-A100/A50/A45:
DNW-A100P/A50P/A45P: 625/50 system
(Refer to Section 7-2-2 of the operation manual.)
VIDEO OUTPUT
COMPOSITE 1, 2, 3
VIDEO OUTPUT
COMPONENT R-Y
Ex. 75 % Color-bar
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
TEKTRONIX 1750, 1780R,
or equivalent
or equivalent
INPUT VIDEO
525/60 system
VIDEO OUTPUT
COMPONENT Y
VIDEO OUTPUT
COMPONENT B-Y
1-7. Service Action after Replacing or Repairing the Mounted Circuit Board
3. Press the PB.EE button on the lower control panel to
light its indicator.
4. Set the setup extend menu ITEM-105 to "ON".
5. For the DNW-A100/A50/A45 only, set the sub-ITEMs
0 and 1 in the setup extend menu ITEM-709 to "D-1".
6. Input the analog composite video signal (BB signal) to
REF. VIDEO connector (75 Z switch: ON).
Checks
VTR with BKDW-505/506 or BKNW-104
1. Set the setup extend menu ITEM-309 to "AUTO".
2. VTR with BKDW-505/506:
Input the 75 % color-bar signal (composite) to VIDEO
INPUT COMPOSITE connector (75 Z switch: ON),
and set VIDEO INPUT SELECT to "COMPOSITE".
VTR with BKNW-104:
Input the 75 % color-bar signal (D-1 format, compo-
nent) to VIDEO INPUT COMPONENT connectors
(Y/R-Y/B-Y), and set VIDEO INPUT SELECT to
"COMPONENT".
4 Check that the STOP button is not blinking.
5. With the CHARACTER switch turned to "OFF",
check that no abnormality exists in the output signal
from all the VIDEO OUTPUT connectors (COMPOS-
ITE 1/2/3, and COMPONENT Y/R-Y/B-Y) using the
two waveform monitors.
VTR without BKDW-505/506 or BKNW-104
1. Set the setup extend menu ITEM-309 to "EXT".
2. To generate the test signal within VTR, select "75 %
Color Bars" using C21 : VIDEO TEST SG of the
maintenance mode.
(Refer to "4-2-6. AUDIO/VIDEO CHECK Mode
(C2)" of the maintenance manual part 1.)
3. With the CHARACTER switch turned to "OFF",
check that no abnormality exists in the output signal
from all the VIDEO OUTPUT connectors (COMPOS-
ITE 1/2/3, and COMPONENT Y/R-Y/B-Y) using the
two waveform monitors.
4. Check that the STOP button is not blinking.
5. Exit the maintenance mode.
Perfection
1. Set the CHARACTER switch to "ON".
2. Return the setup extend menus ITEM-105/309/709 to
the customer settings, and the OUT REF and CHAR-
ACTER switches to the customer settings.
(CP-277)
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