Sony HCD-PX5 Service Manual page 48

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Note: A clear RF signal waveform means that the shape "◊" can be clearly
distinguished at the center of the waveform.
RF signal waveform
Checking Location: BD (CD) board
E-F Balance Check
Connection:
BD (CD) board
TP (TE)
TP (VC)
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on the
BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
[REPEAT]
4. Press the button. (The tracking servo and the sled-
TE
L 13942296513
ding 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 ± 22%
Traverse Waveform
0 V
[REPEAT]
6. Press the button. (The tracking servo and sledding
servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
Traverse Waveform
0 V
www
Tracking servo
Sled servo
OFF
.
Checking Location: BD (CD) board
48
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VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(normal speed)
level: 1.2 ± 0.2 Vp-p
oscilloscope
(DC range)
+
–
Center of
the waveform
B
A (DC
voltage)
level: 1.3 ± 0.6 Vp-p
C (DC
voltage)
Tracking servo
Sled servo
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ON
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8
Checking Location:
– BD (CD) BOARD (Conductor Side) –
TP
(VC)
IC171
TP
(FE)
TP (TE)
TP (RF)
IC101
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co
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0 5 8 2 9 9 4 2 8
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