CD-BA3100 (serv.man7). Split - Section 5 - Voltage, Notes on schematic diagrams, Types of transistor LED, Waveforms, Troubleshooting, Function table of IC, Wiring of primarily supply leads - 47-61 - Sharp Audio Service Manual (repair manual). Page 5

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– 51 –
CD-BA3100H
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 
µ
sec/div
T
FDO
DRF
TE
Stopped
CH1=500 mV
DC   10:1
CH2=10 V
DC   10:1
CH3=1 V
DC   10:1
500 ms/div
(500 ms/div)
NORM: 20 kS/s
1
2
3
=Record Length=
Smoothing :   ON
CH1  :      0.000 V
CH2  :          0.0 V
Main  :      100 K
Zoom  :         2 K
Mode  :   AUTO
Type   :   EDGE CH1
Delay  :                   0.0 ns
Hold off  :                0.2 
µ
s
CH3  :        0.00 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
-3 div
-1 div
0 div
+1 div
+3 div
CH  Position  To
CH2
  Position
  0.20 div
T
FDO
TDO
Stopped
CH1=500 mV
DC   10:1
CH3=500 mV
DC   10:1
500 ms/div
(500 ms/div)
NORM: 20 kS/s
1
3
=Record Length=
Smoothing :   ON
CH1  :      0.000 V
CH2  :          0.0 V
Main  :      100 K
Zoom  :         2 K
Mode  :   AUTO
Type   :   EDGE CH1
Delay  :                   0.0 ns
Hold off  :                0.2 
µ
s
CH3  :      0.000 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH1
  v/DIV
  500 mV
If the level is not normal.
1. Is focus servo activated ? (Waveform drawing Figure 51-2)
 Pins 7~12, 79 and 80 on IC1
Check the laser diode driver Q1 peripheral circuit.
When a disc is loaded, start playback operation.
2. Does DRF change from "L" to "H" ?
Is the disc rotating ?
3. Is the HF waveform normal ?
(Waveform drawing Figure 51-3)
Check the spin system.
If the disc is spinning and a HF waveform is generated,
DRF will go H.
Figure 51-1
Check the laser diode driver Q1 peripheral circuit.
(1) Focus-HF system check.
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
1. Does the pickup move to the PICKUP-IN Switch (NSW1)
position ?
Sled motor (NM2).
Press the Disc 1~6 Eject switch (SW712, SW713,
SW721~SW724) without inserting a disc, and try starting the
playback operation.
2. Does the focus (lens) move up and down ?
    (Waveform drawing Figure 51-1).
Check the focus peripheral circuit.
3. Is the laser lit ?
Spindle motor (NM1).
4. Is the turntable rotating ?
Figure 51-2
Figure 51-3
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
Yes
No

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