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6-2. APR-12 Board Replacement
The electrical adjustments are essential after the APR-12 board for DNW-A22/A22P is replaced.
To perform the electrical adjustments, the following equipment and fixtures are required.
. Audio analyzer:
TEKTRONIX AA501A-option 02 or equivalent
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Always, the audio analyzer should be filtered through 80 kHz LPF.
. Audio level meter:
HEWLETT-PACKARD HP3400A or equivalent
. Oscilloscope:
TEKTRONIX 2465B or equivalent
. Extension board:
EX-556 (SONY part No. A-8277-212A)
. Alignment tape(s)
For DNW-A22:
CR8-1A (SONY part No. 8-960-097-45)
For DNW-A22P:
CR8-1A PS (SONY part No. 8-960-098-45) and
CR8-1B PS (SONY part No. 8-960-096-86)
. Shorting clips (2 Pcs.)
6-2-1. Replacement Procedure
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Turn off the POWER switch before starting the replacement.
(1) Remove the upper lid, board retainer (S), and APR-12 (original) board.
(Refer to "6-1-3. Plug-in Board Pulling out/Insertion".)
(2) Disconnect the two harnesses from CN500 and CN600 on the APR-12 (original) board.
(3) After inserting the extension board EX-556 to the slot for APR-12 board, and then connect a new
APR-12 board to the extension board.
(4) Connect the two disconnected harnesses to CN500(red) and CN600(yellow) on the APR-12 (new)
board.
(5) Clean the AT head. (Refer to "5-2-5. Stationary Heads Cleaning".)
(6) Perform the electrical adjustments (Section 6-2-3).
(7) For DNW-A22P only
Return the ITEM-F01: AUDIO NR IN SP MODE of setup extend menu to "ON".
(8) Return the states of S1100-1 on the SS-63 board (DNW-A22P only), control panels, and connector
panel to their original states.
(9) Turn off the power, and wait for 30 seconds.
(10) Remove the adjusted APR-12 board from the extension board, then pull out the extension board.
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It is not necessary to disconnect the harnesses that are connected to the adjusted APR-12 board.
(11) Set the shorting plugs on the adjusted APR-12 board to the same settings as the original board.
(For shorting plugs, refer to Section 1-10-1.)
(12) Insert the adjusted APR-12 board.
(13) Reattach the board retainer (S) and upper lid.
(Refer to "6-1-3. Plug-in Board Pulling out/Insertion".)
DNW-A22/A22P
6-2. APR-12 Board Replacement
6-9
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