CX-LMNV5, XR-MNV5 - Sony Audio Service Manual (repair manual). Page 25

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Checking Location: BD board (Side B)

+
–

BD board

TP2 (TE)

TP7 (VC)

oscilloscope

Traverse Waveform

0V

B

level: 1.0 

±

 0.5 Vp-p

Center of 
the waveform

A (DC 

voltage)

Traverse Waveform

0V

Tracking servo

Sled servo

ON

C (DC 
voltage)

Tracking servo

Sled servo

OFF

6.

Press the CD 

u

   button. (The tracking servo and sledding

servo are turned ON)
Rotate RV101 on BD board and adjust the C (DC voltage) 
is almost equal to the A (DC voltage) in step 4. 

7. To exit from this mode, turn the power off.

• Always move the optical pick-up to most inside track when

exiting from this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can

be chipped.

Procedure:
1.

Connect an oscilloscpe to test point TP2 (TE) and  TP7 (VC)
on the BD board.

2.

AC is put in pushing CD 

u

button to enter the CD test 

mode.

3.

Put the disc (YEDS-18) in to playback the number five track.

4.

Press the                      button. If it plays, press the

CD 

u

  

button again. (The tracking servo and the sledding servo are
turned OFF)

5.

Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than 

±

 10%

CD 

u

  

IC101

TP7
(VC)

IC103

RV101
E-F Balance
Adjustment

  TP8
(RFAC)

  TP6
(RFDC)

TP4
(FE)

TP2
(TE)