Sharp QT-CD180(BL) User manual

QT-CD180
CONTENTS Page
IMPORTANT SERVICE NOTES (FOR U.S.A. ONLY)....................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 3
FITTING OF DIAL POINTER ............................................................................................................................................. 3
OPERATION MANUAL ...................................................................................................................................................... 4
DISASSEMBLY.................................................................................................................................................................. 5
REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 6
ADJUSTMENT ................................................................................................................................................................... 8
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 11
TYPES OF TRANSISTOR ............................................................................................................................................... 11
SCHEMATIC DIAGRAM .................................................................................................................................................. 12
WIRING SIDE OF P.W.BOARD....................................................................................................................................... 14
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 16
TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 17
FUNCTION TABLE OF IC................................................................................................................................................ 21
PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET (FOR U.S.A. ONLY)
• In the interests of user-safety the set should be restored to its
originalconditionandonlypartsidenticaltothosespecifiedshould
be used.
SERVICEMANUAL
SHARP CORPORATION
No. S1102QTCD180/
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-CD180(BL)
QT-CD180(RD)
QT-CD180(S)
QT-CD180(WH)
PORTABLE CD STEREO SYSTEM
MODEL

QT-CD180
– 2 –
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
BEFORE RETURNING THE AUDIO PRODUCT
(Fire & Shock Hazard)
Before returning the audio product to the user, perform the
following safety checks.
1. Inspect all lead dress to make certain that leads are not
pinchedorthathardwareisnotlodgedbetweenthechassis
and other metal parts in the audio product.
2. Inspect all protective devices such as insulating materials,
cabinet, terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.
3. To be sure that no shock hazard exists, check for leakage
current in the following manner.
* Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all exposed
metal cabinet parts and a known earth ground, such as
conduit or electrical ground connected to earth ground.
* Use a VTVM or VOM with 1000 ohm per volt, or higher,
sensitivity to measure the AC voltage drop across the
resistor (See diagram).
* Connect the resistor connection to all exposed metal parts
havingareturnpathtothechassis(antenna,metalcabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.
IMPORTANT SERVICE NOTES (FOR U.S.A. ONLY)
AllcheckmustberepeatedwiththeAClinecordplugconnection
reversed.
Anyreading of0.3 voltRMS (thiscorresponds to0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.
SPECIFICATIONS
Specifications for this model are subject to change without
prior notice.
AC SCALE
VTVM
1.5k ohms
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
■Tape recorder
Frequency response
Signal/noise ratio
Wow and fiutter
Motor
Bias system
Erase system
50 - 14,000 Hz (Normal tape)
50 dB
0.25 % (WRMS)
DC 9 V electric governor
AC bias
Magnet erase
■Compact disc player
Type
Signal readout
Audio channels
Filter
D/A converter
Wow and flutter
Compact disc
Non-contact, 3-beam semi-conductor laser pickup
2
8-time oversampling digital filter
1-bit D/A converter
Unmeasurable (less than 0.001% W. peak)
■General
AC 120 V, 60 Hz
DC 9 V [“D” size (UM/SUM-1, R20 or HP-2) battery x 6]
11 W
3-1/8" (8 cm) full-range speaker x 2
5.5 lbs. (2.5 kg) without batteries
Power source
Power consumption
Output power
Speakers
Dimensions
Weight
FM; 87.5 - 108 MHz
AM; 530 - 1,720 kHz
■Radio
Frequency range
FTC; 2.0 W min. RMS per channel into 4 ohms from 150
Hz to 20 kHz, with no more than 10 % total harmonic
distortion.
RMS; 2.3 W/CH (DC operation, 10 % T.H.D)
Width; 14-6/8" (376 mm)
Height; 5-7/8" (150 mm)
Depth; 9" (230 mm)

QT-CD180
– 3 –
NAMES OF PARTS
FITTING OF DIAL POINTER
Setting method of the dial pointer
1. Remove the front cabinet. (Refer to Fig.5-2 on page 5,
"Disassembly method".)
2. Remove the dial pointer.
3. Insert the dial pointer from A of the top cabinet so that it
engages with the drum gear.
4. Fully turn the drum in the opposite direction of B and set
it to the FL marks.
5. Reassemble the front cabinet.
Figure 3-1
Drum
Drum
Dial
Pointer
Dial
Pointer
Tuning Knob
Tuning Knob
Main PWB
Main PWB
Main PWB
Top Cabinet
Top Cabinet
Variable
Capacitor
Variable
Capacitor
A
B
Drum Dial
Pointer
Tuning Knob
FL Mark
Dial Pointer
FH FL
1234567 8
9
10
11
12
13
14 15 16
17
10. (TAPE) Record Button
11. (CD) Play/Pause Button
12. (CD) Track Up/Cue Button
13. Cassette Compartment
14. (CD) Stop Button
15. (CD) Track Down/Review
Button
16. (CD) Play Indicator
17. (CD) Pause Indicator
01. Volume Control
02. Function Switch
03. CD Compartment
04. (TAPE) Pause Button
05. (TAPE) Stop/Eject Button
06. (TAPE) Fast Forward Button
07. (TAPE) Rewind Button
08. Tuning Control
09. (TAPE) Play Button
18 19 20
18. Battery Compartment
19. FM Telescopic Rod Antenna
20. AC Power input Socket

QT-CD180
– 4 –
OPERATION MANUAL
Quick Guide / Guía rápida
■Operation with AC power
■
Funccionamientoconcorriente alterna
■Operation with batteries
■
Funccionamiento con pilas
To anAC outlet
A un tomacorriente de CA
To AC INPUT
A la toma AC INPUT
AC 120 V, 60 Hz
120 V de CA, 60 Hz
●6 “D” size batteries (UM/SUM-1, R20, HP-2 or similar)
●Batteries are not included.
●
6 pilas del tamaño “D” (UM/SUM-1, R20, HP-2 o similares)
● Las pians no están incluidas.
5
46
132
■ Turning the power
ON and OFF
■
Conexión (ON) y
desconexión (OFF)
de la alimentación
● Label side up.
●
Con el lado de la etiqueta
encarada hacia arriba.
To stop playback
Press the STOP ■button.
Para detener la
reproducción
Pulse el botón STOP
■ .
123 45
1 Preparation for use / Preparación para su uso
2 Listening to a CD /
Audictión de CD
123
To stop playback
Press the STOP/EJECT ■
button.
Para detener la
reproducción
PulseelbotónSTOP/EJECT
■
.
12
12
●Load the disc to be
recorded.
●
Introduzca el disco que
va a grabar.
To stop recording
Press the STOP/EJECT ■
button.
Para detener la grabación
PulseelbotónSTOP/EJECT
■
.
3 Listening to a tape / Audictión de una cinta
4
Listening to the radio /
Audictión de la radio
5 Recording from a CD / Grabaciones de CD
4
35

QT-CD180
– 5 –
1 Rear Cabinet 1. Screw ................... (A1) x4 5-1
2. Socket .................. (A2) x1
2 Front Cabinet 1. Open the cassette holder 5-2
2. Socket .................. (B1) x1
3. Screw ................... (B2) x4
4. Screw ................... (B3) x2
3 Main PWB 1. Knob..................... (C1) x1 5-3
(With CD Control 2. Socket ..................(C2) x3
PWB) 3. Screw ................... (C3) x5
(Note) 4. Screw ................... (C4) x1
5. Socket .................. (C5) x1
4 Tape Mechanism 1. Screw ................... (D1) x2 5-3
5 CD Control PWB 1. Screw ................... (E1) x2 5-4
(With Main PWB) 2. Bracket................. (E2) x2
6 CD Mechanism 1. Screw ................... (F1) x3 5-4
7 Power PWB 1. Battery Lid............(G1) x1 5-5
2. Screw ...................(G2) x1
3. Bracket .................(G3) x1
4. Hook.....................(G4) x1
DISASSEMBLY
Caution on Disassembly
Followthebelow-mentionednoteswhendisassembling the
unitandreassemblingit,tokeepitsafeandensureexcellent
performance:
1. Take cassette tape and compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need
to be removed when disassembling the unit. After
servicing the unit, be sure to rearrange the leads
where they were before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
STEP REMOVAL PROCEDURE FIGURE
Figure 5-3
Figure 5-1
Figure 5-2
Figure 5-5
Figure 5-4
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.
(G2)x1
ø3x10mm
Rear Cabinet
Power PWB
Driver
(G4)x1
(G1)x1
(G3)x1
Front Cabinet
Rear Cabinet
Top Cabinet Main
PWB
(A2)x1
(A1)x4
ø3x14mm
(B3)x1
ø3x8mm
(B2)x4
ø3x10mm
(B3)x1
ø3x8mm
Tape
Mechanism
Front Cabinet
Main
PWB
Open Cassette
Holder
(B1)x1
(F1)x3
ø2.5x10mm
CD Mechanism
CD Control
PWB
Top Cabinet
PWB
Washer x3
(E1)x2
ø3x10mm
(E2)x1 (E2)x1
(C3)x5
ø3x10mm (D1)x2
ø3x8mm
(C4)x1
ø2.5x10mm
(C5)x1
(C2)x3
(C1)x1
Volume
PWB Tape
Mechanism
CD Mechanism
CD Motor
PWB
Main PWB
Top Cabinet

QT-CD180
– 6 –
TAPE MECHANISM SECTION
Performsteps1to4ofthedisassemblymethodtoremovethe
tape mechanism. (See page 5.)
How to remove the record / playback and erase
heads (See Fig. 6-1.)
1. Remove the screws (A1) x 2 pcs., to remove the record/
playback head.
2. Remove the hooks (A2) x 2 pcs., toward the center
position as shown in Fig. 6-1. and then extract the erase
head upward.
Note:
After replacing the heads and performing the azimuth
adjustment, be sure to apply screwlock.
How to remove the pinch roller (See Fig. 6-2.)
1.Removethescrew (B1) x1pc.,and remove thepinchroller
upwards.
How to remove the belts (See Fig. 6-3.)
1. Remove the main belt (C1) x 1 pc., from the motor
pulley.
2. Remove the FF/REW belt (C2) x 1 pc., from the REW/FF
roller.
3. Put on the belts in the reverse order of removal.
Note:
Whenputtingonthebelt, ascertain that the beltisnottwisted,
and clean it.
How to remove the motor
(See Fig. 6-4.)
1. Remove the main belt. (See Fig. 6-3.)
2. Remove the screws (D1) x 2 pcs., to remove the motor
bracket.
3. Remove the screws (D2) x 2 pcs., to remove the motor.
Note:
When mounting the motor, pay attention to the motor bracket
angle.
Figure 6-1
Figure 6-2
Figure 6-3
Figure 6-4
(A1) x1
ø2x7mm(A1) x1
ø2x3mm
Record/Playback
Head
Erase Head
Hook
(A2)x2
REMOVING AND REINSTALLING THE MAIN PARTS
Pinch Roller
(B1) x1
ø1.5x2.5mm
Motor Bracket
Motor
Motor
(D2)x2
Special
Screw
(D1) x1
ø2.5x4mm
(D1) x1
ø2.5x4mm
Motor
REW/FF
Roller
Flywheel
FF/REW Belt
(C2)x1
Main Belt
(C1)x1
Motor Pulley

QT-CD180
– 7 –
CD MECHANISM SECTION
Performsteps1to 6ofthedisassemblymethodtoremovethe
CD mechanism. (See page 5.)
How to remove the pickup (See Fig. 7-2.)
1. Remove the screws (A1) x 2 pcs., to remove the shaft
(A2) x1 pc.
2. Remove the stop washer (A3) x1 pc., to remove the gear
(A4) x 1 pc.
3. Remove the pickup.
Stop
Washer
(A3) x1
CD
Mechanism
Gear
(A4) x1
Shaft
(A2) x1
Pickup
(A1) x2
ø2.6 x6mm
Figure 7-2
Figure 7-1
(E1) x 1
Stop Washer
Washer
Flywheel
How to remove the flywheel (See Fig. 7-1.)
1. Remove the belt. (See Fig. 6-3.)
2. Remove the stop washer (E1) x 1 pc., with a small
precision screwdriver to extract the flywheel from the
capstan metal.
Note:
When the stop washer is deformed or damaged, replace it
with a new one.
How to reinstall the parts
Installeachpart in thereverseorder of theremovalwithcare.
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.

QT-CD180
– 8 –
MECHANISM SECTION
• Driving Force Check
PLAY: TW-2412 Over 80 g
Torque Meter Specified Value
• Torque Check
Torque Meter Specified Value
Play: TW-2111 30 to 60 g.cm
Fast Forward: TW-2231 55 to 140 g.cm
Rewind: TW-2231 55 to 140 g.cm
• Tape Speed
MTT-111 Variable 3,000 ±90 Hz Output: Speaker
resistor in Terminal
motor. (M601) (CNP201 Load
resistance: 4 ohms)
Instrument
Connection
Specified
Value
Test
Tape
TAPE SECTION
Position of each switch or control
Volume control Max
Function switch Tape/Power Off
• Bias Oscillation
Adjustment Point
• Playback Amplifier Sensitivity Check
Instrument Connection
Test Tape
MTT-118 1.1 V ±3 dB Speaker Terminal
(Load resistance: 4 ohms)
Specified Value
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
FM Detection T2
FM fL: L2
Band Coverage fH: TC2
FM Tracking fL: 88.0 MHz: L1
fH: 108.0 MHz: TC1
Test Stage Specified
Value/Adjusting
Point
Instrument
Connection
Input: Pin 1 of IC1
Output: Pin 18 of IC1
Input: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 4
ohms)
• AM IF/RF
AM IF T3 Input: Antenna
Output: Pin 18 of IC1
AM fL: L4 Input: Antenna
Band Coverage fH: TC4 Output: Speaker
AM Tracking fL: 600 kHz: L3 Terminal (CNP201
fH: 1,400 kHz: TC3 Load resistance: 4
ohms)
Test Stage Specified
Value/Adjusting
Point
Instrument
Connection
Figure 8 ADJUSTMENT POINTS
• Head Azimuth
Torque Meter Specified Value
MTT-114 Output: Speaker Terminal
(CNP201 Load resistance: 4 ohms)
Adjusting
Point
Specified Value Instrument
Connection
L301 80 kHz ±6 kHz Pin 1 of CNP101
M601
TAPE MOTOR
SW601
TAPE MAIN
TAPE MECHANISM
Variable resistor
in motor
VR201
SW201
CNP101
SW102
L1
L4 L2
IC1
T3 IC101
BI803
IC201
CNP602
BI802
BI801
L301
T2
1
1
TC4
TC2
TC1
TC3
FM ROD ANTENNA
MAIN PWB
1
13
18
AM BAND
COVERAGE
fL fH
AM IF
FM
DETECTION
12
24
BIAS OSC.
AM
TRACKING
fL fH
L3
AM BAR
ANTENNA
1
12 11
2
2
3
4
123
2
FM BAND
COVERAGE
L3
IC802
IC803 1
14
15 IC801
112
13
24
CNP201
28
fH
fL
FM
TRACKING
fH fL

QT-CD180
– 9 –
CD SECTION
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
TEST MODE
While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".
Start
Note 1. When the CD LID switch is in the OFF position, (CD LID is open) the unit will be able to enter the test mode.
However, can use the "UP/CUE" and "DOWN/REVIEW" button only.
2. You can only move the pickup.
3. The LCD display should be the same as it is for normal CD operations.
Operation The use of the "UP/CUE" button will move the pickup to the outermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
After connecting of the 10 kohm resistor between IC802 27 pin and GND and holding down the "Stop" and "Up"
button at same time, move the FUNCTION switch to "CD".
Start
Display
LCD MODE
1. Before the laser light up, CD LID switch (SW801) terminals have to be short with the solder.
Resistor of 330ohm is put from 27 pin of IC802, and you must connect it to GND of PWB. (Refer to PWB of Figure9-1.)
PREPARATION FOR LASER LIGHT UP
Figure 9-1
1. Remove the front cabinet according to the disassembly method.
2. Short the TP of the Figure 9-1 to turn on the CD LID switch (SW810).
3. While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".
4. Open the CD LID and press the PLAY button. The laser lights up for a few seconds. (At this time, the pickup lens moves
up and down and adjusts the focus to check if there is a disc or not.)
LASER LIGHTING CONFIRMATION
TP
1
5
10
12
13
15
20
24
7
10 20
8
21
22
1
5
8
1
525
28
1
16
E
C
B
1234
C847 C844
C853
C846 C855
X801
C84
0
IC801
C820
C863 C829
R829 C819
R830
R806
R851
R852
C842
C839 C838
R824
R820
C841
C830
R805
C828
BI802
C804
C816
R802
C801
R804
C815 C802
BI801
Q801
C817
R801
C835
C834
R853
C807
IC802
R839
R862
R844
R846
C824
R861
CNP101
C843
R821
C825
R843
C823 R826
C827
R827
C826
C833
R828
FW806
6
4
C106
R106
SW102
IC803
BI803
C
805
6
1510152025
30 31
354045 50
51
55
60
65
70
75
80
81
85
90
95
100
A B C D
H G F E
SW102
RECORD/PLAYBACK
PLAY REC.
110
330 ohm
Resistor GND
27pin
MAIN
PWB-A1
OPEN/CLOSE
SW810
CD LID
SWITCH
BR BR
GY GY GY
GY GY
W
H

QT-CD180
– 10 –
1. In Power OFF state, set the Function switch to ON, keeping to be pressed the "Stop" and "Up" button at same time.
AfterCDinitializefinish.TheCDTESTmodeisset,andtheLCDindicatetothetotaltracksofthedisc.ReleasethePLAYbutton.
The CD TEST mode is set when the LCD indicate to " 1".
Then cut the above circuit.
2. In above TEST mode state, press once the PLAY button.
The laser is light up when LCD indicate to "cd".
SETTING METHOD FOR LASER LIGHT UP
Figure 10
SETTING FOR MAXIMUM LASER POWER
1. In above laser light up state, adjust the variable resistor (VR1A) on pickup PWB to maximum laser power.
Maximum laser power : Rotate the variable resistor (VR1A) to clockwise.
Note :
The TEST mode is cleared by Power OFF.
PICKUP UNIT
Variable Resistor
VR1A
Pickup PWB

QT-CD180
– 11 –
NOTES ON SCHEMATIC DIAGRAM
1. Tuner
( ) : AM mode
: FM mode
2. CD
( ) : Stop state
: Play mode
3. Deck section
Stop mode
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
• Parts marked with “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
SW102 RECODE/PLAYBACK REC—P.B.
SW201 FUNCTION SELECTOR TAPE/OFF—AM/ON—
FM/ON—CD/ON
SW601 TAPE MAIN OFF—ON
SW702 PICKUP IN OFF—ON
SW801 PLAY/PAUSE OFF—ON
SW802 STOP OFF—ON
SW803 TRACK DOWN/REVIEW OFF—ON
SW804 TRACK UP/CUE OFF—ON
SW810 CD LID OFF—ON
REF. NO DESCRIPTION POSITION
ECB
(S)(G)(D)
(1) (2) (3)
FRONT
VIEW
KRC107 M
KTA1046 Y
KTA1266 GR
KTA1273 Y
KTC3199 GR
TYPES OF TRANSISTOR
•Resistor:
To differentiate the units of resistors, such symbol as K and
M are used: the symbol K means 1000 ohm and the symbol
M means 1000 kohm and the resistor without any symbol is
ohm-type resistor. Besides, the one with “Fusible” is a fuse
type.
•Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means pico-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic
capacitor, the expression “capacitance/withstand voltage”
is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
•Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
•Theindicated voltage ineachsection is theonemeasuredby
Digital Multimeter between such a section and the chassis
with no signal given.

QT-CD180
– 12 –
A
B
C
D
E
F
G
H
1234 5 6
• The numbers 1 to 17 are waveform numbers shown in page 16.
Figure 12 SCHEMATIC DIAGRAM (1/2)
8
9
10
3
2
2
13
F1
IC803
AM IF FM
DETECTION
AM IF
FM IF
9
8
7
6
5
4
3
2
115
11
10
PIN
NO. VOLTAGE
IC803
3.8V
3.6V
2.1V
2.1V
0V
1.7V
8.3V
0V
2.1V
2.1V
3.8V
3.8V
0V
7.7V
24
23
22
21
20
19
18
17
16
26
25
PIN
NO. VOLTAGE
0.9V
0.9V
3.8V
3.8V
2.1V
2.1V
8.3V
8.3V
2.1V
2.1V
2.1V
3.8V
3.8V
0V
13
12
14 28
27
AM
TRACKING fH
fL TC3
L3
AM BAND
COVERAGE fH
fL TC4
L4
FM BAND
COVERAGE fH
fL TC2
L2
FM
TRACKING fH
fL TC1
L1
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO. VOLTAGEIC1
0.82V(0V)
0V(0V)
0.35V(1.03V)
3.81V(3.82V)
0V(0.13V)
3.92V(3.86V)
3.39V(3.18V)
3.92V(3.86V)
0V(0V)
0V(0.14V)
0.32V(0.32V)
3.14V(3.29V)
21
20
19
18
17
16
15
14
13
24
23
22
PIN
NO. VOLTAGE
1.22V(1.22V)
1.22V(1.22V)
3.20V(3.14V)
3.14V(3.92V)
0.7V(0.70V)
1.08V(1.01V)
0.4V(1.02V)
3.92V(3.85V)
3.92V(3.86V)
3.92V(3.86V)
3.92V(3.86V)
3.92V(3.82V)
( ): AM
3.72V(5.0V)
( ): CD STOP
1.87V(1.45V)
2.97V
(4.39V)
8.15V
(8.3V) 8.21V(8.3V)
7.48V(7.59V)
( ): CD STOP
0V(0V) 4.97V(5.0V)
0V(0V)
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
IC1
TA2111N
9 10 11 12
13
14
15
16
17
1819202122
23
24
8
7
6
5
4
3
2
1
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1
9
8
10
12
11
7
6
5
4
3
2
1
DMO
VCC
REG OUT
VIN4 VIN3VIN2
GND
GND GND
VG4 VG3VG2
VO2+ VO2– VO1– VO1+ VG1 VIN1
VCC
VO4+
VO4– VO3–
VO3+
TRB MUTE OPO OPI+
OPI– BIAS
FM
AM
R-CH
L-CH
TRO
FOO
FMO
AM OSC.
FM ANT.
ST
LED
TUN
LED
AMRF IN
FMRF
OUT
RF GND
AM OSC.
LPF1
AM/FM LPF2
VCO
GND
AM IF IN FM IF
IN
AM
AGC
AM LOW CUT
FM ROD
ANTENNA
R-CH(CD) L-CH(CD)
RF
VCC FM
OSC AM
OSC
VCC
FM
AFC
DET
MPX
IN
TAPE
ALC T
FILTER
VCC
GND
NC
NF1
NF2
IN2
IN1
OUT2
OUT1
R
P
R
R
P
R
P
P
P
R
R
R
R
L-CH
R-CH
ERASE HEAD
TAPE
AM
FM
CD
CD
TAPE
FM OSC.
AM ANT.
FM
OSC.
L-CH
R-CH
FMRF IN
MIX
OUT
FM DET
P
PU-IN
+
+
–
–
SP+
SP–
SL+
SL–
PU-IN
LD
K
E
E
K
LD
VR
PD
G
B
B
A
F
F
C
TR+
TR–
FO+
FO–
R–
R+
F+
F–
PICKUP UNIT
CD MOTOR PWB-B
FC–
FC+
TR–
TR+
GND
PD
VR
LD
GND
K
F
B
E
A
VCC
FNI
FPI
TPI
TNI
MDI
LDO
SEL
TEB
2VRO
TEN
TEO
RFN
GND
RFO
AGCI
RFGC
RFGO
RFIS
RFRP
VRO
FEN
FEO
SBAD
MON
SLT–
SLT+
FM–
FM+
DM–
DM+
13
17
16
15
14
12
8
9
10
11
2
13
16 1718
4
654
9 8 7
321
2
1
3
4
3
2
1
2
1
3
M
19 2021
5
M
1
1
2
3
222324
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
5
1
2
3
45
1
2
3
45
1
2
3
4
8
7
6
45
1
2
3
8
7
6
45
1
2
3
8
7
6
4
1314 15
1211 10
123456789
1011121314
1516171819202122232425262728
A
P
P
SWITCHING
0.0022
1M
1M
0.0022
SWITCHING
1
23
SW102-D
SW201-B
SW201-C
SW102-E
SW102-H
IC801
SW102-C
SW102-B
SW102-G
SW102-F
SW102-A
IC101
BA3311L
BIAS OSC.
RECORD/
PLAYBACK HEAD
4.67V
4.62V
0V
1.89V
0V0V
0V
0.6V
0V
0V 0.6V
CNS802
BI802
CNS801
BI801
BI803
CNP803
CNS803
M701
SLED
MOTOR
M702
SPINDLE
MOTOR
Q801
KTA1266 GR
C802
0.022
C817
100/10
R802
2.2K
C801
0.01
R811
22K
IC801
SERVO PRE AMP.
TA2109F
C804
2P(CH)
R804
68K
R805
39K R807
1K
R806
2.7K
C820
0.1(ML) C818
56P
C819
0.1(ML)
C822 0.047
C821
100/10
R803
82K
R852
2.2K
R851
2.2K
C807
0.047
C856
0.001
C806
330/16
C805
0.022
L3
AM BAR
ANTENNA
C21
2P(CH) C2
18P(CH) C3
22P
(UJ) R2
2.7K
C4
4P(CH) C6
330P
C7
2.2/50
R5
3.3K
C10
1/50
C9
0.1/50
C11
0.47/50
R1 330
R3
220K
C12 4.7/50
C14 0.022
C13
220/10
T3
CF3
460kHz
CF1
10.7M
T2
FM BAND
BASS
FILTER
C1
0.022
C20
0.047
D1
1N4148
R103
12K C105
0.0027
R105
10K
R104
12K
R102
150 R101
150
R109
120 C109
270P C113
47/16
R113
8.2K
C115
0.018(ML)
R115
3.9K
R117
3.9K
C121
0.01
R119
3.3K
C117
10/16
R107
1K
C107
820PC111
330P
C106
0.0027
R106
10K
C110
270P C114
47/16
C116
0.018
(ML)
R114
8.2K R116
3.9K R118 3.9K
C118
10/16
D102
1N4148
R120
3.3K
C120 47/16 C119
2.2/50
D101
1N4148
C123
220/10
R125
680K
C122
0.01
R122
1.8K
R121
1.8K
R126
100
C351
0.0022
(ML) C352
100/10
L301 C354
0.022(ML)
R351
100
R352
150 0
R826
220K
R820
47K
L802
0.82µH
R827
15K
C830
0.01(ML)
C829
0.0047
C828
0.0027
R828
10K
C833
0.033(ML)
C854
0.0068
R812
1K
R
1
R829
3.3K
R831
3.3K
R833
3.3K
R
3
R
3
X
8
1
6
C84
5
0.04
7
C838 0.047(ML)
C837 0.047(ML)
C835 470P
C836 0.047(ML)
C839 0.047(ML)
C834
470P
C842
0.047
C843
47/16
C841
0.047
C863
47/16
C832
47/16
D801
1N4004
Q803
KRC107 M
Q802
KTA1273 Y
R850
1.5K
R456
39K
R455
39K
R211
3.3K
COR1
CORE
R6
100
R7
120
R11
6.8K
R10
6.8K
C22
0.1/50
C15
10P(CH)
CNP101
CNS101
R110
120
R108
1K
C108
820P
C112
330P
IC803
FOCUS/TRACKING/
SPIN/SLED DRIVER
MM1469XH
R853
2.2K
C814
0.047
C813
47/16
R801
22
C816
0.022
C815
47/16
L4
L1
FM RF L2
R9
10K
R8
10K
C17 1/50 C19 0.015(ML) C16 1/50 C18 0.015(ML)
D2
1N4148
R4
2.2K
C8
0.1/50
C826
47P
C825
47/16
C
8
0.01
5
SW702
PICKUP IN
SW102
RECORD/
PLAYBACK
TC4
VC2
TC3
VC1
VC3
TC1
VC4
TC2
SW102
RECORD/
PLAYBACK
SW201
FANCTION
SELECTOR
SW10
2
RECO
R
PLAYB
SW102
RECORD/
PLAYBACK
IC1
FM/AM IF MPX.
TA2111N
IC101
REC/P.B.
EQUALIZER AMP.
BA3311L
SW102
RECORD/
PLAYBACK

QT-CD180
– 13 –
Figure 13 SCHEMATIC DIAGRAM (2/2)
78 9101112
• NOTES ON SCHEMATIC DIAGRAM can be found on page 11.
12
13
57
6
1
11
15
14
4
17 16
VOLUME
OPEN/CLOSE
RECORD SIGNAL
PLAYBACK SIGNAL
CD SIGNAL
FM SIGNAL
AM SIGNAL
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO. VOLTAGE
IC801
4.84V
2.04V
2.04V
2.12V(0V)
2.11V(0V)
0.18V(0V)
2.84V(0V)
2.41V(0V)
2.05V
4.08V
2.05V
2.08V
21
20
19
18
17
16
15
14
13
24
23
22
PIN
NO. VOLTAGE
2.86V(0.99V)
2.12V
2.05V
2.05V
2.63V(1.15V)
2.04V
2.07V
2.17V
2.04V
1.47V(0.77V)
0V
2.05V
( ): CD STOP
50
51
52
53
1.50V
0V
2.10V
2.10V
4.98V
2.10V
2.10V
2.73V(1.15V)
2.30V(2.1V)
2.94V(0.989V)
2.14V
2.14V
2.18V
2.11V
2.10V
2.14V
2.10V
2.10V
2.17V
4.18V
2.47V(0V)
4.97V
0V
0V
2.08V
2.57V
4.92V
0V
2.48V
2.37V
98
99
2.33V
0V
0V
0.56V
0V
0V
0.56V
8.35V 8.02V
4.27V
8.01V
9.05V
4.33V
4.67V
0V
5.08V 9.05V
8.44V
8.44V
4.96V
4.39V
0V
3.32V
0.68V
V
)
+B+B
+B
+B +B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
( ):STOP
8
7
6
5
4321
9
8
7
11
10
13
14
12
6
5
4
3
2
1
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
3132
33
34353637
38
3940
4142
434445
46
474849
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
8
7
6
5
4
3
2
1
FM
AM
R-CH
L-CH
NC
NC
NC
NC NC NC NC
NC
NC
NC
NC
NC
NC NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
POWER PWB-A4
GND(AUDIO) GND(POWER) GND(CD)
SPEAKERS
+5V(CD)
–
+
TAPE
AM
FM
CD CD
FM
AM
TAPE
AC/DC SELECTOR
AC INPUT
–
–
+
+
VOLUME
R
T
APE
AM
FM
CD
CD
T
APE
PUSEL2
DISPLAY
TRAY CLOSE
MVSS1
MVDD1
CDSEL0
SEG1
COM1 MVDD MVSS MXI MXQ REMO-IN RYNCREC RESET DVSL
LO
DVRL DVDD DVRR RO
DVSR
TEST0
SPCK SPDA
COFS
DOUT
SBSY
SBOK
VDD1
VSS1
P2VREF
PDO
TMAX
LPFN
LPFO
PVREF
VCOF
AVSS
SLCO
RFI
AVDD
RFCT
RFZI
RFRP
FEI
SBAD
TEI
TEZI
FOO
TRO
VREF
RFGC
TEBC
FMO
DMO
2VREF
SEL
VDD2
VSS2
XI
XO
XVDD
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
DOOR IN
DOOR OUT
ADIN1
ADIN2
MUTE
PU IN
TEST1 TEST2 TEST3 TEST4 TEST5
/HSO
CDSEL1
TRAY OPEN
PUSEL0
PUSEL1
XVSS
COM2 COM3 COM4 NC NC
CD CONTROL PWB-A3
6
2
3
4
5
10
1
10
1
19
23
22
21
20
13
17
16
15
14
12
8
9
10
11
M
1
22
1
1
2
3
1
2
3
1211 10 P
REGULATOR
SW201-A
VOLUME
PWB-A2
–
+
–
+
SW201-D
REGULATOR
RECORDING
BIAS OSCILATOR
SW102-D
SW201-B
SW201-C
MAIN PWB-A1
BIAS OSC.
BATTERY
DC 9V[ "D" SIZE
(UM/SUM-1,R20 OR HP-2)
BATTERY x 6]
R-CH
4 OHM
L-CH
4 OHM
AC 120V, 60Hz
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
2.49V
0V
0V
0V
0V
4.98V
0V
0V
0V 0V
4.98V
0V
4.98V
4.98V
0V
4.97V
0V
0V
0V
0V
0V
0V 0V
0V
0V
4.97V
2.49V
0.43V(2.36V)
1.66V
2.46V
0V
4.97V(0V)
4.98V
0V
4.18V
2.10V
2.08V(0V)
2.10V(1.34V)
2.01V(4.12V)
2.10V
82
83
4.72V
84
2.36V
2.47V
0V
0V 0V 4.95V
0V
4.96V
4.96V
0.30V
0V
4.96V
2.33V
2.33V
2.33V
C352
100/10
L301 C354
0.022(ML)
R351
100
R352
150 C353
0.0056(ML)
R353
33K
R354
4.7
Q351
KTC3199 GR
SW201
FANCTION
SELECTOR
Q204
KTA1046 Y
D202
1N4148
Q205
KTC3199 GR
R203
560
C204
0.022
ZD201
DZ5.1BSB
C203
0.01
C202
47/16
D203
1N4148
R201
2.2K
R202
4.7K
D201
1N4148
C218
0.0015
R220
2.7K
C241
47/16
VR201-B
20K(B)
C216
0.047(ML)
C222
0.001
C220
10/16
C236
100/10 R232
120 R231
120
C225
100/10
VR201-A
20K(B)
C217
0.0015
R219
2.7K
R221
1K
C221
0.001
C219
10/16
C235
100/10
C226
0.022
C227
2200/16
C234
470/10
C238
100/10
C240
0.15(ML)
C239
0.15(ML)
C237 100/10
C233
470/10
CNP201
CNS201
CNS602
CNP602
C652 0.022
D653
1N4004
D654 1N4004
C654
0.022
D652
1N4004
D651
1N4004
R230
2.7
C653
0.022
C651
0.022
T651
POWER
TRANSFORMER
SP202
FW806
LCD801
LCD DISPLAY
R848
2.2K R849 6.8K
R847
1K
SW804
TRACK UP/
CUE
SW803
TRACK
DOWN/
REVIEW
SW802
STOP
SW801
PLAY/
PAUSE
R846
330
R844
3.3K
R862
22K
C824
0.022
R861
3.3K
R843
3.3K
R821
22K
C823
0.022
R824
10K
R826
220K
R820
47K
R827
15K
C830
0.01(ML)
C829
0.0047
C828
0.0027
R828
10K
C833
0.033(ML)
C854
0.0068
R812
1K
R830
10K
R829
3.3K
R831
3.3K
R833
3.3K R834
3.3K
R832
3.3K
C840
0.047
X801
16.93MHz
R840
10
C845
0.047
7
(ML)
7
(ML)
7
(ML)
7
(ML)
R860
100
C857
0.01
C844
100/10
C853
0.022
R836
270
C852
3.3/50
C850 0.0022
C849 0.0022
R835
270
C851
3.3/50
R837
10K
R838
10K
C848
22/16
C847
22/16
C846
1/50
R839
47K
C855
0.022
IC802
SERVO/
SIGNAL
CONTROL
TC9457F0
8
01
4
004
R456
39K
R455
39K L801
0.82µH
R215
2.7K
R216
2.7K
R210
3.3K
R211
3.3K
SW810
CD LID
C826
47P
C825
47/16
C827
0.015(ML)
C215
0.047(ML)
R222
1K
IC201
POWER AMP.
TA8227P
SW201
FANCTION
SELECTOR
SW102
RECORD/
PLAYBACK
SW201
FUNCTION
SELECTOR
SW601
TAPE
MAIN
M601
TAPE
MOTOR
SP201
SO651
AC INLET
SOCKET

QT-CD180
– 14 –
Figure 14 WIRING OF P.W.BOARD (1/2)
A
B
C
D
E
F
G
H
1234 5 6
1
5
10
12
13
15
20
24
7
10 20
8
14 15
21
22
13
15
2024
1
11 22 3
3
123
510 12
1
5
8
1
525
28
1
16
1
1
2
3
4
5
6
7
8
10
1
2
31
2
1
2
3
14
4
5
6
12
11
10
13
9
8
7
E
C
B
ECB
E
C
B
123
E
C
B
1234
B
C
E
C216
C218
R220
VR201-B
R219
C217
C215
D201
C240
C241
C238
C236
R232
R222 C220
R221 C222 C221
IC201
C227
C233 C239
C226
CNP602
CNP201
C219
R231
C235
C225
C237
R455
R456
C204
R203
D202
D203
Q205
R202
C203
R210
ZD201 R201
C202
R215
R211
R216
C234
Q204
SW201
L801 R837
C851
C849
C852 R835
R838 C848
C850 R836
C847 C844
C853
C846 C855
X801
C840
C845
R840
C832
R860
C857
R230
IC801
C820
C863 C829
R829 C819
R830
R831 R807
R833 C818
R832
R834
C836
C821
C854
L802
C837
R812
D801
Q803
R850
Q802
C822
C813
R803
C814
R811
R806
R851
R852
C842
C839 C838
R824
R820
C841
C830
R805
C828
BI802
C804
C816
R802
C801
R804
C815 C802
BI801
Q801
C817
R801
C835
C834
R853
C807
IC802
R839
R862
R844 R846
C824
R861
CNP101
C843
R821
C825
R843
C823 R826
C827
R827
C826
C833
R828
FW806
IC101
R109
C111
C112
R110
C110
C116
R114
R102
C106
R106
SW102
C107
R101
R107
C105
R105
R104
R103
R113
R115
C115
C113
C117
R121
C120
C109 R108
C108
IC1
C14
C11 R3
C15
C12
CF3
CF1
R1
R126
COR1
C352
R351
R10
T2
R11
R8
R9
C13
C16
C17
R117
R119
D101 R125
C121
R7
L1 C2 C3
F1
R4
D2 C22
R6
C123
L4
C21
R2
L2
C4
C1
C8
C18
C10
C9
R5 C20
C19
C6
C7
LCD801
FW806
SW804
TRACK UP/
CUE
R849
SW801
PLAY/
PAUSE
SW802
STOP
R848
R847
SW803
TRACK
DOWN/
REVIEW
IC803
BI803
D102
C114
C122
C119
R120
R122
C351
R118
C118
R116
C805
C806
C856
Q351
R354
C353
R353
C354
R352
L301
T3
VOLUME
VR201-A
VR201
A
D
B
C
1510152025
30 31
354045 50
51
55
60
65
70
75
80
81
85
90
95
100
A B C D
H G F E
123456789
10
11
12
D1
VC4
TC4
VC3
TC3
VC2
TC2
VC1
TC1
SW102
RECORD/PLAYBACK
PLAY REC.
110
CNS802
CNS801
BK
BK
RD
WH
RECORD/PLAYBACK
HEAD(242-4)
ERASE HEAD
(242-5)
TAPE
BK
CNS101
BK
WH
RD
BK
1
2
3
4
MAIN
PWB-A1
CD CONTROL
PWB-A3
L3
AM BAR ANTENNA
OPEN/CLOSE
SW810
CD LID
BR BR
YL
RD
BK
BK
WH
WH
WH
WH
BK
WH
WH
WH
WH
WH
WH
WH
GY GY GY
GY GY
WH
1
2
3
4
5
8
7
6
5
4
3
2
1
SW201
FUNCTION
SELECTOR
CD
TAPE
OFF
ON
FM
AM
GND
VOLUME
PWB-A2
BL
BL

QT-CD180
– 15 –
Figure 15 WIRING OF P.W.BOARD (2/2)
78 9101112
• The numbers 1 to 17 are waveform numbers shown in page 16.
GND
+B
IC802
1510152025
30 31
354045 50
51
55
60
65
70
75
80
81
85
90
95
100
1
5
10
12
13
15
20
24
IC801
7
10 20
8
14 15
21
22
1
525 28
IC803
C651
C652
C654
D651
D654 D652
D653
C653
SW702
PICKUP IN
M702
SPINDLE MOTOR
M701
SLED MOTOR
CNP803
F3895AF
CNS602
FM ROD ANTENNA(238)
BR
COLOR TABLE
RD(R)
OR
YL
GR
BL
VL
GY
WH(W)
BK
PK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
T651
POWER
TRANSFORMER
(233)
(232)
BATTERYS
DC9 V [ "D" size
(UM/SUM-1,R20 or HP2)
battery x 6 ]
1
54321
78 654321
PICKUP UNIT
CD MOTOR PWB-B
POWER PWB-A4
BK
RD
RD
YL
YL
RD RD
RD
SO651
AC INLET SOCKET
AC 120V, 60Hz
2
(235)
2
3
12
13
8
10
4
5
1
6
14 15
11
16 17
7
9
CD MOTOR PWB-B
SPEAKERS SP201
SP202
R-CH L-CH
CNS201
BL
BK
GY
3 2 1
BK
BK
GY
BL
RD
RD
1
2
3
4
5
6
CNS803
WH
GY
GY
GY
GY
GY
1
2
3
4
5
6
YL
M601
TAPE MOTOR
(242-6)
SW601
TAPE MAIN
(242-7)
RD
BK
BR
TAPE

QT-CD180
– 16 –
WAVEFORMS OF CD CIRCUIT
NO DISC FOCUS SEARCH
1
2
3
FOO
FO+
FO-
IC802 66Pin
IC803 20Pin
IC803 21Pin
1
2
3
FOCUS SEARCH TOC IL
1
2
3
SEL
FEI
TEI
IC802 74Pin
IC802 62Pin
IC802 64Pin
4
5
6
5
7
8
STOP PLAY
1
2
3
FEI
SBAD
RFO
IC802 62Pin
IC802 63Pin
IC801 22Pin
STOP PLAY
1
2
3
FEI
RFGO
RFRP
IC802 62Pin
IC801 19Pin
IC801 17Pin
5
9
10
STOP PLAY
1
2
3
TEI
TRO
SBAD
IC802 64Pin
IC802 67Pin
IC802 63Pin
6
11
7
12
13
14
STOP PLAY
1
2
3
TMAX
SBOX
DMO
IC802 50Pin
IC802 45Pin
IC802 72Pin
STOP PLAY
1
2
3
TEI
TRO
FMO
IC802 64Pin
IC802 67Pin
IC802 71Pin
6
11
15
6
11
15
CUE
1
2
3
TEI
TRO
FMO
IC802 64Pin
IC802 67Pin
IC802 71Pin
REVIEW
1
2
3
TEI
TRO
FMO
IC802 64Pin
IC802 67Pin
IC802 71Pin
6
11
15
16
17
TCD-782 TNO-02 PLAYBACK
1
2
LO
RO
IC802 86Pin
IC802 82Pin

QT-CD180
– 17 –
TROUBLESHOOTING (CD SECTION)
HOW TO USE
1. Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the brush on the CD cleaner disc which has
the mark next to it.
2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.
3.Youwillhearmusicforabout20secondsandtheCDplayerwillautomaticallystop.Ifitcontinuestoturn,pressthestopbutton.
CAUTION
TheCD lenscleanershouldbeeffectivefor30 -50operations,howeverifthebrushes becomeworn outearlierthenplease
replace the cleaner disc.
If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft cloth.
Do not drink the cleaner fluid or allow it to come in contact with the eyes. In the event of this happening then drink and / or
rinse with clean water and seek medical advice.
The CD cleaner disc must not be used on car CD player or on computer CD ROM drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting product is prohibited by law.
Cleaning Disc
PARTS CODE:
UDSKA0004AFZZ
Cleaner Liquid
Figure 17
When the CD does not function
When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean
theobjective lens,and checkthe playbackoperation. Whenthis sectiondoes notoperate evenafter theabove stepis taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup
lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn off the power, and wipe the lens softly using a cleaning paper moistened with commercially available cleaning solution so
as not to damage it.
Be careful not to touch the lens with bare hands.
Dust gradually accumulates on the objective lens during use, and it may degrade performance.
To avoid this problem, use a cleaning disc designed for CD optical pickup lenses.
Check the pickup-in switch (SW702) position.
Check the Focus system.
Yes
• The CD function will not work.
The CD operating keys don't work.
Check the power supply, 16.93 MHz clock, and reset terminal.
Yes
Yes

QT-CD180
– 18 –
• Laser failure.
Yes No Check the laser come on when pattern cut between pin 8 (SEL) of
IC801 and pin 74 (SEL) of IC802.
Yes No Check the peripheral parts of IC801 and Q801. If it is normal, the
optical pickup is faulty.
Check BI801/CNS801. If it is normal, the optical pickup is
faulty.
Is approx. 1.8V applied to the collector of Q801.
• Focus failure.
Does the optical pickup move up and down when the disc is
removed ?
Is the following waveform output at the pin 62 (FEI) of IC802
when the disc is set ?
Is the waveform shown above input at the pin 63 (SBAD) of
IC802 ?
Yes
Yes
No
No
The optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
FAILURE".
Yes
Check the periphery of IC801 and BI801/CNS801. Is it normal ?
No Check the pattern between pin 13 of IC801 and pin 63 of IC802.
Check the periphery of IC801 and BI801/CNS801.
IC801 is faulty.
Yes
Is +5V applied to the emitter of Q204 ?
Is +5V applied to the collector of Q204 ?
Yes No
No
Check the PWB pattern of Q204.
Check the peripheral parts of IC803 and Q204.
Is +5V applied to the pin 75 (VDD) of IC802 ?
Is +5V applied to the pin 1 (VCC) of IC801 ?
Yes No
No
Check the PWB pattern between collector of Q204 and pin 75 of
IC802.
Check the PWB pattern between collector of Q204 and pin 1 of
IC801.
Yes
Yes
Is +0V applied to the pin 74 (SEL) of IC802 ?
pin 62
pin 86
pin 63
(FEI)
(FOO)
(SBAD)

QT-CD180
– 19 –
• Focus servo sawtooth wave failure.
Is +8.1V applied to the pins 21 and 22 (VCC) of IC803 ?
Is sawtooh wave output to the pin 66 (FOO) of IC802 ? IC802 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 17 and 18 of IC803 ? No Check the PWB pattern of IC803.
Check the PWB pattern of IC803.
No
Is sawtooth wave obtained between pins 3 and 4 of BI801/
CNS801 ? (as shown above)
Yes
Check the PWB pattern between BI801/CNS801 and IC803.
No
BI801/CNS801 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 5 and 6 of IC803 ?
Is following wave output to the pin 72 (DMO) of IC802 when
the Function is changed to "PLAY" from "STOP" ? No
Yes
Check the procedure in "HF ERROR".
If OK. IC802 is faulty.
Check the PWB pattern between pin 72 (DMO) of IC802 and pins
5 and 6 of IC803. If OK. IC803 is faulty.
No
Is above wave obtained between pins 5 and 6 of BI803/
CNS803 ?
Yes
Check the PWB pattern between BI803/CNS803 and IC803.
No
BI803/CNS803 connection failure or optical pickup failure.
Yes
1.5~2.5sec
1.5~2.5sec
DMO

QT-CD180
– 20 –
• Sled motor operation failure.
Yes
Yes
Is following sled feed signal output the pin 71 (FMO) of IC802
when FF/REW key is pressed after the CD TEST MODE is
seted ?
Is sled feed signal output the pins 10 and 11 of IC803 ?
Is sled feed voltage applied between both terminals of sled
motor ?
No
Check the peripheral parts of IC803. If OK, IC803 is faulty.
No
IC802 is faulty.
Check the BI803/CNS803.
No
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Yes
Is following sled signal output the pin 71 (FMO) of IC802
during playback ?
Normal.
No IC802 is faulty.
• Track search failure
Does the sled motor run in FF/REW state when the CD
TEST MODE is set ?
Is the following wave output to the pin 67 (TRO) of IC802
during track search in normal playback ?
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback ?
Yes
Yes
No Check as stated in item "SLED MOTOR OPERATION FAILURE".
No IC802 failure.
No Check the PWB pattern between pin 67 (TRO) of IC802 and pin
25 of IC803.
Check the PWB pattern between pins 26 and 27 of IC803 and
Optical pickup.
If OK. Optical pickup failure.
Yes
Is the above wave output to the pins 64 (TEI) and 65 (TEZI)
of IC802 during track search in normal playback ? No Check the PWB pattern between pin 12 (TEO) of IC801 and pins 64
(TEI) and 65 (TEZI) of IC802. If OK. IC801 failure.
Normal.
Yes
Yes
Is following sled feed signal input the pins 12 and 13 of IC803
when FF/REW key is pressed after the CD TEST MODE is
seted ?
Check the PWB pattern between pin 71 of IC802 and pins 12 and
13 of IC803.
No
Is the following wave output to the pin 60 (RFZI) and 61
(RFRP) of IC802 during track search in normal playback ? No Check the PWB pattern between pin 22 (RFO) and 18 (RFIS), 17
(RFRP) of IC801 and pins 60 and 61 of IC802. If OK. IC801 failure.
Yes
TRO
TEO
TEI
TEZI
RFRF
REZI
FMO
FF REW
SL
FF REW
FMO