BMZ-K1, CX-BK1 - Sony Audio Service Manual (repair manual). Page 29

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29
CX-BK1
Checking Location: BD board (Side B)
Adjustment after CD Base Unit (BU-30CBD64NS) is Re-
placed
Perform the “E-F Balance (1 track jump) check”.
+
BD board
TP (TE)
TP (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
A (DC 
voltage)
Tracking servo
Sled servo
OFF
6.
Press the      button. (The tracking servo and sledding servo
  
are turned ON)
Confirm A (DC voltage) at that tome is 0 V.
7. To exit from this mode, turn the power off.
Notes:
• 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.
E-F Balance Adjustment
Connection:
Procedure:
1.
Connect an oscilloscpe to test point TP (TE) and TP (VC) on
the BD board.
2.
AC is put in pushing
B
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         button again.
B
  
(The tracking servo and the sledding servo are turned OFF)
5.
Rotate RV101 on the BD board to adjust A (DC voltage) of
the center of the oscilloscope waveform becomes 0 V.
Checking Location:
– BD BOARD (Side B) –
  
B
B
IC101
TP7
(VC)
IC103
RV101
E-F Balance
Adjustment
  TP8
(RFAC)
  TP6
(RFDC)
TP4
(FE)
TP2
(TE)
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