HCD-H991AV, MHC-991AV, MHC-G99AV - Sony Audio Service Manual (repair manual). Page 17

— 17 —

— Component Side —

Procedure:
1. Connect test point TP701 (ADJ) on Main board to Ground with a

lead wire.

2. Connect oscilloscpe to test point TP (TEO).
3. Turned Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the

top and bottom in relation to 0Vdc, and check this level.

Specified level: •                     x 100 = less than 

±

 7%

• A + B = 300 

±

 100 mVp-p

6. Remove the lead wire connected in step 1.

This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.

A – B

2 (A + B)

— Conductor Side —

±