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6-4. EQ-56 Board Replacement
6-4. EQ-56 Board Replacement
The electrical adjustments are essential after the EQ-56 board is replaced.
To perform the electrical adjustments, the following equipment and fixtures are required.
. Oscilloscope:
. Composite video monitor (to display of the maintenance mode)
. Extension board:
. Alignment tape(s)
For DNW-A22:
For DNW-A22P:
6-4-1. Replacement Procedure
n
Turn off the POWER switch before starting the replacement.
(1) Remove the upper lid, board retainer (S), and EQ-56 (original) board.
(Refer to "6-1-3. Plug-in Board Pulling out/Insertion".)
(2) Disconnect the harnesses to the EQ-56 (original) board, then connect them to the EQ-56 (new) board.
(3) Insert the EQ-56 (new) board.
(Refer to "6-1-3. Plug-in Board Pulling out/Insertion".)
(4) Extend the DM-89 board with the EX-377 extension board.
(5) Clean the video heads.
(Refer to "5-2-5. Tape Running Surface of Upper Drum and Video Heads Cleaning".)
(6) Set the CHARACTER switch on the sub control panel to ON.
(7) Perform the electrical adjustment (Section 6-5-2).
(8) Turn off the power.
(9) Remove the DM-89 board from the extension board, then pull out the extension board.
(10) Reinsert the DM-89 board.
(11) Reattach the board retainer (S).
(Refer to "6-1-3. Plug-in Board Pulling out/Insertion".)
(12) Reattach the upper lid.
(13) Return the CHARACTER switch state to previous state.
6-68
TEKTRONIX 2465B or equivalent
EX-377
(SONY part No. J-6269-810-A) for DM-89 board extension
SR5-1
(SONY part No. 8-960-075-01),
CR5-1B
(SONY part No. 8-960-096-41), and
CR5-2A
(SONY part No. 8-960-097-44)
SR5-1P
(SONY part No. 8-960-075-51),
CR5-1B PS (SONY part No. 8-960-096-91), and
CR5-2A PS (SONY part No. 8-960-097-44)
DNW-A22/A22P
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