DOWNLOAD JBL SG 2020 Service Manual ↓ Size: 4.1 MB | Pages: 73 in PDF or view online for FREE

Model
SG 2020
Pages
73
Size
4.1 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
sg-2020.pdf
Date
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JBL SG 2020 Service Manual ▷ View online

-13-
FER
ISTAT(SENSE)
C
Start mode
Does FE1 signal appear? IC 801     pin
Does FZC signal (focus zero cross signal)
appear at pin      of IC 801, ISTAT (SENSE)
terminal?
Does SMON signal appear 
at pin      of IC 802?
Does SMPO signal appear 
at pin      of IC 802?
Is drive voltage applied to disk motor?
Defective IC 801.
Open pick diode
Defective IC 801.
Defective Pattern between IC 801 and
IC 802.
Defective IC 801, 803 and/or
peripheral circuit.
Defective disk motor and/or insulation.
(Focus servo turns
ON by FZC signal
of FOK mod.)
NO
NO
NO
NO
YES
YES
YES
YES
YES
59
31
73
75
-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
0V
CH1 : FOCUS COIL DRIVE
SIGNAL 2V/Div.
CH2 : FOAK
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
(
CH1 : TEO(TP801) 1V/Div.
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
(
0V
(CH1)
0V
(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
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)
0V
(CH2)
0V
(CH1)
0V
(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)
0.5V/Div.
500nS/Div.
(
2V/Div.
500nS/Div.
(
0.5V/Div.
500nS/Div.
(
0V
-15-
WIRING DIAGRAM
(MODEL : SG2020)
-16-
WIRING DIAGRAM
(MODEL : SG3030)
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