Read JBL SG 2020 Service Manual online
-14-
WAVEFORMS OF MAJOR CHECK POINT
1. HF signal (RF signal ) waveform
(Test Point TP801) during normal play
2. EFM signal (pin IC 801)waveform
during Normal Play
0V
0V
3. Focus coil drive waveform(Pin NO 1, 2 of IC 803)
• When focus search failed or there is no disc on
the tray
3. Focus coil drive waveform(Pin NO , of IC 803)
• Focus coil drive waveform(pin NO 1, 2 of
IC803) and FOK (pin NO 40 of IC 801) when
focus search is accomplished
focus search is accomplished
0V
CH1 : FOCUS COIL DRIVE
SIGNAL 2V/Div.
CH2 : FOAK
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACKING COIL DRIVE
CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACK COIL DRIVE
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACK COIL DRIVE
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
(
0V
(CH1)
(CH1)
0V
(CH2)
(CH2)
4. Tracking coil drive waveform (pin NO 26, 27
of IC 803) and TEO during track traverse
(1) When time division is 20nS/div
(1) When time division is 20nS/div
4. Tracking coil drive waveform (pin NO 26, 27 of IC
803) and TEO during track traverse
(2) When time division 0.5nS/div.
(During forward track traverse)
0V
(CH1)
(CH1)
0V
(CH2)
(CH2)
0V
(CH1)
(CH1)
0V
(CH2)
(CH2)
(3) When time division is 0.5nS/div.
(During backward Track Traverse)
5. Feed motor drive waveform(pin NO 11, 12
of IC 803) During normal play
0V
0V
(CH2)
(CH2)
0.5V/Div.
500nS/Div.
500nS/Div.
(
2V/Div.
500nS/Div.
500nS/Div.
(
0.5V/Div.
500nS/Div.
500nS/Div.
(
0V
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