Sony HCD-EP315 Service Manual page 15

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E-F Balance Check
Connection:
oscilloscope
CD board
TP (TE)
+
TP (DVC)
–
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (DVC) on
the CD board.
2. AC is put in pushing CD N button.
3. FL tube carries out all lights and goes into CD test mode.
4. Put the disc (YEDS-18) in to playback the number five track.
5. Press the CD N button. (The tracking servo and the sledding
servo are turned OFF)
6. 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
Center of
the waveform
B
0V
T E level: 1.15 ± 0.5 Vp-p
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7. Press the CD N button. (The tracking servo and sledding
servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 4.
8. 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.
Traverse Waveform
0V
Tracking servo Tracking servo
Sled servo Sled servo
OFF ON
Checking Location: CD board (Conductor side)
w w w
.
Checking Location:
– CD BOARD (Conductor Side) –
TP (VC)
IC103
TP
TP
(DVC)
(RFAC)
TP (FE)
IC101
TP (TE)
TP
(RFDC)
A (DC
voltage)
C (DC
voltage)
x a o
y
i
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HCD-EP315
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