Service Manuals, User Guides, Schematic Diagrams or docs for : LG Car Audio tch-c600 TCH-C6~1
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13. TROUBLESHOOTING GUIDE
NO
Is power ON? + Check power supply circuitry.
CD Magazine
I-
Insert.
NO
w Check Elevator circuitry.
I
YES
-
I
NO
Does initial reading occur? Check laser circuitry.
YES
v Check focusing circuitry.
.
-
_ Check disc.
NO
Can disc be played? w Check tracking servo circuitry.
I
YES
I
NO
Is audio output supplied? w Check Audio circuitry.
,
I
YES
I
OK
- 40 -
(1) If display LCD lighting is not normal (without Disc)
NO Check voltage in the power NO Power supply circuitry
Do display LCD then light?
b supply circuitry. * defective.
YES
Is u-COM IC751 reset circuit
normal? Pin 68
YES
I
Is u-COM lC751 C.L.K
terminal Pin 58 (OSC) . NO C751, C752 defective.
input? X751 defective.
about 4.19MHz
YES
I
Is IC751 Pin 21, 22 output
waveform normal? NO +/l_inli
YES
1
Is IC751 Pin 23-72 output
waveform normal? NO Pattern defective.
YES
Display defective.
-41,
(2) If initial reading is not carried out (with Disc)
Is lC401 Pin 17 output NO
Does disc motor rotate? Leaf SW contact defective.
INO waveform normal? -
I
I
Connector defective.
YES IC401 17 EJECT Pattern short.
YES
I
NO
Does laser light?
)8
YES 13b @3J
$-c_ NO
Is tracking servo
operating?
Is the lower ~
NO
Is signal output
at TEI? NO
Is TE signal
output, at
ICI01 Pin 53?
NO
ICI 01 defective.
Connector
defective.
envelopeof RF
t Pick-up defec-
waveform flat?
tive.
T YES
I YES 1
Pattern
YES defective.
I
Is signal output at tracking output NO ICI 01,201 -
ICI01 Pin 57? defective. I
ICI01 Pin 57 waveform Pick-up
YES 1 defective.
I
w Connector
defective.
Is rotation normal? I Does IC301 Pin 25 (LKFS) I as
\
Is there any irregularity in NO figure?
frequency? NO IC301
defective.
- 7-T--T-
YES
1
Is HF signal normal without
dropout?
NO Disc initial reading damaged
or defective.
YES
Disc defective.
- 42 -
When laser does not light.
8
Is below signal "L" at IC401 Pin
37 (LD ON)?
C
1
YE L NO
. v 4
Has Pick-up returned to NQ Are data transferred from NQ
the innermost position? - IC401 45,46,47?
YES YES
Is below signal output at
ICZOI , ICI 01 defective.
IC201 Pin 17, 18?
ICI 01 defective.
Does pick-up stop after
having moved to the
Are detect output input at
ICI01 Pin 30?
I
innermost position? ICI 01
Pin 40. -~~~~~-~~~~~, NO
NO SLIDE IN SW defective.
Connector defective.
-i
YES
I- IC201 defective.
I
Does generate about 3.5V at
ICI01 Pin 70 LD in IC401 Pin NO ICI 01 defective.
37 (LD ON)? ti Surrounding circuitry defective.
yw
returned to the QIOI?
(QIOI collector voltage about
12.OV)
No Connector defective.
QIOI defective, connector
YES R103<1.0V defective.
Laser defective.
1
Flow laser current?
Both voltage of QIOI is about YES Laser defective.
NO
1 .OV? w R103M.OV
b Connector defective, short etc.
- 43 -
@I When laser lights.
Do lenses move up and down? _
1 NO Is signal output at focus search
terminal?
NO
-
ICI 01 defective.
YES
ICI01 Pin 57 (FEO)
YES
1
Is signal output at IC201
. IC201 defective.
Pin 1, 2?
Insert disc and YES
Actuator short.
in the case of
7 Connector short.
check of initial
leading.
Is RF (HF) signal waveform
output? NO Connector short.
* ICI01 defective.
-AJL -
YES
1
The waveform of RF (HF) is
below figure? NO Turntable height error.
/ * Laser diode degraded.
Is Fok signal output?
TPI (HF and REF) 0. `er NO
I ICI 01 defective.
YES
Is Fok signal input to IC401 Pin 49 NO
(FOK)? e Pattern defective.
I I
YES
- 44 -
YES
I
Is FEB signal output?
ICI01 Pin 56. , ICI 01 defective.
NO
Pick-up defective.
Connector defective.
YES
I
Is FEI signal output at ICI01 Pin 33
(SENS)? NO When Fok focus Servo
+ ICI01 defective.
Conform by FZC signal.
FEI
SENSE
YES
I
Is Mon signal output by
IC301 Pin 73? NO Pattern defective between IC301 Pin 27, 36,
37,38 and IC401.
Is MPD signal output by
IC301 Pin 75? i
m
YES
I
Has voltage at disc motor?
NO IC201, ICI 01 defective.
Surrounding circuitry defective.
YES
Disc Motor defective.
w Connector defective.
- 45 *
AUDIO CHECK
Power circuit check
-
1 Is output? 134 Is each voltage normal? Power source, Pattern check.
Is signal returned at IC501 Pin 4, IC501 defective.
5, 6? Surrounding circuitry.
Pin 8 : 88.2kHz
Pin 9 : 4.3218MHz
YES
1
Is signal output at IC502 Pin 18,
-4
NO IC501 defective.
19,20,21? Surrounding circuitry. -
YES
1
Is signal output at IC502 Pin 1, 7? IC502 Defective surrounding
circuitry defective.
YES NO
Base voltage of NO CD cutput terminal
W Q511, Q561 is 6.OV? - defective.
-
I Is "H" at IC401 Pin 61 (A-MUTE)? IC401 defective.
Q402, 403, 404, 511, 561 defective
YES
1
Pattern defective between IC401
Is "L" at IC301 Pin 35 (Mute)?
. Pin 40 and IC301 Pin 35.
YES
I
Audio check OK.
- 46 -
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