Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio FH-X1 FH-X1-TRBL
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Turn power on.
NO Check power supply circuit.
(Check PN 101)
YES
NO
Check laser circuit.
YES
Check focus circuit.
Check disc.
NO
w Check tracking servo circuit.
c
YES
NO
Does it output audio? Check audio circuit.
.
YES
Fails to initial read
-
-0
NO
Disc motor turns. NO Does laser light? A
I
YE
YES s-B 0
I
Does RF Does tracking Does signal Does TE2 signal
NO NO NO NO
waveform servo work? appear at pin @ appear at pin @ Defective IC
appear? Lower envelope of ICI02 of IC102? 102, pick up
Cl 08(RF) of Cl08(RF) and/or short
waveform is flat. wire.
1.3v
YES YES
YES Detective pattern.
-i
I
Does signal appear at IC 104
"~"~"~
Pin @ and Pin @? ~ NO 441 -
I I
YES Defective pick-up
I
b
and/or connector.
Is rotation normal? -
NO Does GFS (ICI03 pin @)
show as below? Defective IC 102.
t-
YES
Is there no dropout of RF Scratch in disc
NO
signal? W initial read area.
L
llllllllllllllllllllllllllllll
Defective pick-up
YES adjustment focus offset.
-9-
0
A Laser does not light.
Is "3.5V" applied to pin @ of IC 102?
1NO
r Did pickup return to
innermost circular?
t-NO
Is data transferred
MICOM IC ?
YES
from
NO
b Defective MICOM.
I
Does voltage appear at IC
104 pin RiJ, @I? Defective IC 102, 104
YES
I I Defective
1 connector.
slide motor and/or
1
Does it stop at inner pick Is defect output from LM
circular after shift? SW applied to pin 0 of
YES PN 103? Defective LMT SW and/or
connector.
OPEN I CLOSE
YES1 4 Defective MICOM.
YES
r- NO
Is power supplied to laser Q102? + Defective connector.
(Q 102 collector: about 1.8V)
R102>>1.OV YES
YES b Defective Q 102 and/or laser.
\
Does laser current flow?
YES Defective laser and/or
1 .OV across RI 02 R102<1.OV
connector.
-IO-
Laser lights.
Does IC 102 out focus
search signal? Defective ICI 02
IC IO2 pin @ (FEO)
YES
I
Is focus search signal
applied to pin @ of NO
b Defective ICI 02
IC104?
Open activator and/or
YES connector.
,L
Confirm Does Cl08 RF signal appear even in
initial low level?
read with
disc NO Open connector and/or
defective IC 102.
YES
YES
I
Does FOK(focus ok) signal appear?
NO
b
Defective IC 102.
Cl08
(RF)
ICI02 pin @
(FCK)
YES
0
C
-ll-
Y
C
YES
Does FE1 signal appear? IC 102 @ pin
NO I Defective IC 102.
Open pick diode
YES
I
Does FZC signal (focus zero cross signal)
appear at pin @I of IC 102, ISTAT (SENSE) (Focus servo turns
terminal? ON by FZC signal
of FOK mod.)
YES
I
Does SMON signal appear r
-_ at pin @ of IC 103? NO Defective Pattern between IC 102 and
IC 103.
Ill III
Does SMPO signal appear
at pin @ of IC 103?
YES
I
Is drive voltage applied to disk motor?
NO Defective IC 102, 103 and/or
peripheral circuit.
Start mode
/(
I 1
YES
Defective disk motor and/or insulation.
-12-
WAVEFORMS OF MAJOR CHECK POINT
HF signal (RF signal ) waveform 2. EFM signal (pin @I IC 102)waveform
(Test Point C108) during normal play during Normal Play
U. Focus coil drive waveform(Pin NO Q9, Q9 of IC 104) . Focus coil drive waveform(pin NO@ ,@ of ICI 04) and
l When focus search failed or there is no disc on the tray FOK (pin NO @I of IC 102) when focus search is
accomplished
-
4. Tracking coil drive waveform (pin NO @ ,@ of IC 104) CHI : FOCUS COIL DRIVE
and TEO during track traverse SIGNAL 2V/Div.
CH2 : FOAK
(1) When time division is 20nS/div
(2) When time division O.%S/div.
(During forward track traverse)
-
CHI : TEO(IC102) CHI : TEO (pin NO @ of IC 102)
1VlDiv. 1VlDiv.
CH2 : TRACKING COIL DRIVE
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
SIGNAL 2V/Div.
(3) When time division is O.%S/div. 5. Feed motor drive waveform(pin NO 0, @ of IC 104)
(During backward Track Traverse) During normal play
/ CHI : TEO(pin NO@ of IC 102)
1`JIDiv.
\ CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
- 13-
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