6-106
DNW-A22/A22P
6-8. VPR-17 Board Replacement
6-8. VPR-17 Board Replacement
The electrical adjustments are essential after the VPR-17 board is replaced.
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When the VPR-17 board is replaced, the adjustments for both 525/60 and 625/50 systems are required.
Be sure to perform all adjustments to maintain the all functions even if that DNW is not carried out the
525/625 system switching.
In the Section 6-8, expresses the 525/60 and 625/50 systems as follows:
Model
525/60 system
625/50 system
DNW-A22
Standard system
Another system
DNW-A22P
Another system
Standard system
To performed the electrical adjustments, the following equipment and fixtures are required.
.
Composite waveform/vector monitor
For DNW-A22:
TEKTRONIX 1750, 1780R, or equivalent
For DNW-A22P:
TEKTRONIX 1751, 1781R, or equivalent
.
Oscilloscope:
TEKTRONIX 2465B or equivalent
.
75
Z
terminator (1 pc.)
.
75
Z
BNC T adapter (1 pc.)
.
Composite video monitor(s): Sony’s BVM series, PVM series, etc.
m
.
For NTSC (525/60 system) and PAL (625/50 system) are required.
.
Having the switchable monitor of the NTSC and PAL is a convenience.
6-8-1. Replacement Procedure
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Turn off the POWER switch before starting the replacement.
(1) Remove the upper lid and board retainer(L). (Refer to “6-1-3. Plug-in Board Pulling out/Insertion”.)
(2) Replace the VPR-17 board. (Refer to Section 6-1-3.)
(3) Perform the electrical adjustments (Section 6-8-2).
(4) Return the states of control panels to their previous states.
(5) Turn off the POWER switch.
(6) Reattach the board retainer(L) and upper lid. (Refer to Section 6-1-3.)
