SCD-1, SCD-777ES (serv.man4) - Sony Audio Service Manual (repair manual). Page 2

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SYS ERROR: Displayed if a communication between CPU

(IC701) and display controller (IC1001) failed at
the start-up. Check the soldering of each IC and
communication lines for disconnection.

If replacing the ROM, shift the ROM socket toward the arrow

direction marked on the socket, then remove the ROM by hand.
Do not touch the optical block when replacing the ROM.

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 Entering a command in the Adjustment-1 mode in other than the
specified order could damage the optical block. Do not enter the
command except for making electrical adjustment or the follow-
ing check.

1. Disc type check

After setting a disc, enter code 30. The type of disc is dis-
played.

2. Focus check

Press the FILTER key without setting a disc. Check the laser
emission of the pickup for SACD and the focus searching.
Then, press the SACD/CD key to check the laser emission of
the pickup for CD and the focus searching.

3. Tilt operation check

Enter code 22 without setting a disc. Then, enter code 23 or
24. After entering the code, check that the tilt motor runs a
little.

4. Sled operation check

Press the NEXT key and check that the sled motor runs a little
and the optical block moves outward a little.
Inward movement can also be checked with the PREV key,
unless the optical block is not at the most inward track.

5. Check of focus, tracking, spindle, and sled servos

Set a disc and enter code 30 to check the disc type. Then, enter
code 01, 02, 04, 05, 06, and 07 in this order. In such a case, the
codes should be entered at a certain interval so that each servo
circuit operates surely.