Sharp XL-3500H User manual

– 1 –
XL-3500H
CONTENTS Page
SAFETY PRECAUTION FOR SERVICE MANUAL .......................................................................................................... 2
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ......................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................ 3
NAMES OF PARTS .......................................................................................................................................................... 4
OPERATION MANUAL..................................................................................................................................................... 6
DISASSEMBLY................................................................................................................................................................. 8
REMOVING AND REINSTALLING THE MAIN PARTS.................................................................................................. 10
ADJUSTMENT................................................................................................................................................................ 11
TEST MODE ................................................................................................................................................................... 12
NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................. 19
TYPES OF TRANSISTOR AND LED.............................................................................................................................. 19
WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 20
BLOCK DIAGRAM .......................................................................................................................................................... 21
SCHEMATIC DIAGRAM ................................................................................................................................................. 24
WIRING SIDE OF P.W.BOARD...................................................................................................................................... 32
TROUBLESHOOTING .................................................................................................................................................... 36
FUNCTION TABLE OF IC .............................................................................................................................................. 42
LCD SEGMENT .............................................................................................................................................................. 44
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)
SERVICE MANUAL
SHARP CORPORATION
No. S4229XL3500H/
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
XL-3500H Compact Audio System consisting of XL-3500H
(main unit) and CP-XL3500H (speaker system).
COMPACT AUDIO SYSTEM
MODEL XL-3500H
(Except for U.K.)

XL-3500H
– 2 –
Beforereturning theunit tothecustomer aftercompletionof a
repairoradjustmentitis necessary forthefollowingwithstand
voltage test to be applied to ensure the unit is safe for the
customer to use.
Setting of Withstanding Voltage Tester and set.
Set name set value
Withstanding Voltage Tester
Test voltage 4,240 VPEAK
3,000 VRMS
Set time 6 secs
Set current(Cutoff current) 4 mA
Unit
Judgment
OK: The “GOOD” lamp lights.
NG: The “NG” lamp lights and the buzzor sounds.
This product is classified as a CLASS 1 LASER PRODUCT.
Precaution to be taken when replacing and servicing the
Laser Pickup.
TheAEL(AccessibleEmissionLevel)ofLaserPowerOutputis
lessthanClass1butthelasercomponentiscapableofemitting
radiationexceedingthelimitforClass1.Thereforeitisimportant
thatthefollowingprecautionsmustbeobservedduringservicing
to protect your eyes against exposure to the Laser beam.
(1) When the cabinet has been removed, the power is turned
on without a compact disc, and the Pickup is on a position
outerthanthelead-inposition,theLaserwilllightforseveral
seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and
replacementservicepartshavealreadybeenadjustedprior
to shipping.
(3) No adjustment to the Laser Power should be attempted
when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens
at any time.
(5)CAUTION-Useofcontrolsoradjustments,orperformance
of procedures other than those specified herein may result
in hazardous radiation exposure.
SAFETY PRECAUTION FOR SERVICE MANUAL
IMPORTANT SERVICE NOTES (FOR U.K. ONLY)
PROBE
AC OUT UNIT
SHORT-CIRCUT
AC POWER
SUPPLY CORD
WITHSTANDING
VOLTAGE TESTER
Screw
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ
KÄYTTÖOHJEESSA MAINITULLA TAVALLA SAATTAA
ALTISTAA KÄYTTÄJÄN TURVALLISUUSLUOKAN 1
YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN
I DENNA BRUKSANVISNING SPECIFICERAS. KAN
ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG LASER-
STRÅLNING, SOM ÖVERSKRIDER GRÄNSEN FÖR
LASERKLASS 1.
ADVERSEL-SYNLIG OG USYNLIG LASERSTRÅLING VED ÅBNING.
SE IKKE IND I STRÅLEN-HELLER IKKE MED OPTISKE INSTRUMENTER.
VARO!AVATTAESSAOLETALTTIINA NÄKYVÄLLE JANÄKYMÄTTÖMÄLLE
LASERSÄTEILYLLE ÄLÄ TUIJOTA SÄTEESEEN ÄLÄKÄ KATSO SITÄ
OPTISEN LAITTE EN LÄPI.
VARNING-SYNLIG OCH OSYNLIG LASERSTRÅLNING NÄR DENNA
DEL ÄR ÖPPNAD. STIRRA EJ IN I STRÅLEN OCH BETRAKTA EJ
STRÅLEN GENOM OPTISKT INSTRUMENT.

– 3 –
XL-3500H
SPECIFICATIONS
Specifications for this model are subject to change without
prior notice.
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
■General
■Amplifier
■CD player
■Tuner
■Speaker
Power source AC 230 V, 50 Hz
Power consump-
tion Power on: 45 W
Power stand-by: 0.6 W
Dimensions Width: 226 mm (8-15/16")
Height: 145 mm (5-3/4")
Depth: 292 mm (11-1/2")
Weight 4.1 kg (9.0 lbs.)
Output power PMPO: 150 W (total)
MPO: 75 W (37.5 W + 37.5 W) (DIN 45 324)
RMS: 50 W (25 W + 25 W) (DIN 45 324)
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended:
32 ohms)
CD digital output (optical)
Input terminals Video/Auxiliary (audio signal): 500 mV/47
kohms
Type Compact disc player
Signal readout Non-contact, 3-beam semiconductor laser
pickup
D/A converter 1-bit D/A converter
Frequency re-
sponse 20 - 20,000 Hz
Dynamic range 90 dB (1 kHz)
Frequency range FM: 87.5 - 108 MHz
AM: 522 - 1,620 kHz
Type 2-way type speaker system
5 cm (2") Tweeter
10 cm (4") Woofer
Maximum input
power 50 W
Rated input power 25 W
Impedance 6 ohms
Dimensions Width: 146 mm (5-3/4")
Height: 267 mm (10-9/16")
Depth: 203 mm (8")
Weight 2.0 kg (4.4 lbs.)/each
Except for U.K.
For U.K.
■Amplifier
Output power RMS: 50 W (25 W + 25 W) (10 % T.H.D.)
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended:
32 ohms)
CD digital output (optical)
Input terminals Video/Auxiliary (audio signal): 500 mV/47
kohms

XL-3500H
– 4 –
NAMES OF PARTS
■Front panel
1.CD Compartment
2.CD Open/Close Button
3.On/Stand-by Button
4.Function Selector Button
5.Bass/Treble Selector Button
6.Memory/Set Button
7.Clear Button
8.CD Stop, Tuning Down Button
9.CD Track Up or Fast Forward,
Tuner Preset Up Button
10.CD Track Down or Fast Reverse,
Tuner Preset Down Button
11.Volume Up and Down Buttons
12.CD Play or Pause, Tuning Up Button
■Display
1.Timer Play Indicator
2.Sleep Indicator
3.CD Random Play Indicator
4.Memory Indicator
5.RDS Indicator
6.Traffic Programme Indicator
7.Traffic Announcement Indicator
8.FM Stereo Mode Indicator
9.CD Play Indicator
10.CD Repeat Play Indicator
11.FM Stereo Receiving Indicator
12.Surround Indicator
12345678
10 12
9 11
1
2
3
4
5
6
7
8
9
10
11
12
■Rear panel
1.CD Digital Output Socket
2.Headphone Socket
3.AM Aerial Terminal
4.Aerial Earth Terminal
5.FM 75 Ohms Aerial Socket
6.Cooling Fan
7.Video/Auxiliary (Audio Signal) Input Sockets
8.Speaker Terminals
9.AC Power Input Socket
■Speaker system
1.Tweeter
2.Woofer
3.Bass Reflex Duct
4.Speaker Terminals
Speaker grilles are removable:
Placing the speaker system:
There is no distinction between the right and the left speakers.
3
2
1
4
5
7
8
9
4
MODEL NO. XL-3500H
<The bottom of the unit>
(For Europe) (For U.K.)
COMPACT AUDIO SYSTEM
230 V 50 Hz 45 W
SERIAL NO.
SHARP CORPORATION
6
1
2
3
Make sure nothing comes into contact with the
speaker diaphragms when you remove the
speaker grilles.
Left speaker Right speaker
MODEL NO. XL-3500H
COMPACT AUDIO SYSTEM
230 V
50 Hz 45 W
FREQUENCY RANGE : FM 87.5 – 108 MHz
FREQUENCY RANGE : AM 522 – 1620 kHz
SERIAL NO.
SHARP CORPORATION

– 5 –
XL-3500H
■Remote control
1.Remote Control Transmitter
2.On/Stand-by Button
3.CD Button
4.Tuner Button
5.Timer Button
6.Clock Button
7.Memory Button
8.Dimmer Button
9.Surround Button
10.Volume Up and Down Buttons
11.Video/Auxiliary Button
12.Band Selector Button
13.Clear Button
14.Sleep Button
15.Random/Repeat Button
16.CD Open/Close Button
17.Tuner Preset Up Button
18.CD Track Down Button
19.CD Fast Reverse, Tuning Down Button
20.CD Play Button
21.CD Track Up Button
22.CD Fast Forward, Tuning Up Button
23.CD Pause Button
24.CD Stop Button
25.Tuner Preset Down Button
26.Bass Up and Down Buttons
27.Treble Up and Down Buttons
28.RDS Programme Type/
Traffic Information Search Button
29.RDS ASPM (Auto Station Programme Memory) Button
30.RDS Display Mode Selector Button
Buttons with " " mark in the illustration can be operated on the re-
mote control only.
Other buttons can be operated both on the main unit and the re-
mote control.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 21
22
23
18
19
20
24 25
26 27
28 29 30

XL-3500H
– 6 –
OPERATION MANUAL
Setting the clock
This may be operated only with the remote control.
In this example, the clock is set for the 24-hour (0:00) display.
To confirm the time display when the power is on:
Press the CLOCK button.
The time display will appear for about 5 seconds.
Note:
The "0:00" or time will flash at the push of the CLOCK button when
the AC power supply is restored after a power failure or unplugging
the unit.
Readjust the clock as follows.
To readjust the clock:
Perform "Setting the clock" from the beginning. If the time display is
flashing, step 2 (for selecting the 24-hour or 12-hour display) will be
skipped.
To change the 24-hour or 12-hour display:
1
Press the CLOCK button and within 3 seconds, press
the MEMORY button.
2
Within 1 minute, press the PRESET ( or ) button to
select 24-hour or 12-hour display and then press the
MEMORY button.
"0:00" The 24-hour display will appear.
(0:00 - 23:59)
"AM 12:00" The 12-hour display will appear.
(AM 12:00 - PM 11:59)
Note that this can only be set when the unit is first installed or it
has been reset.
3
Within 1 minute, press the PRESET ( or ) button to
adjust the hour and then press the MEMORY button.
When the 12-hour display is selected, "AM" will change auto-
matically to "PM".
4
Within 1 minute, press the PRESET ( or ) button to
adjust the minutes and then press the MEMORY button.
The clock starts from "0" second. (Seconds are not displayed.)
1 Clear all the programmed contents.
2 Perform "Setting the clock" from the beginning.
Remote control
■Test of the remote control
Face the remote control directly to the remote sensor on the unit.
The remote control can be used within the range shown below:
Press the ON/STAND-BY button. Does the power turn on? Now, you
can enjoy the music.
0.2 m - 6 m
(8" - 20')
Remote sensor
■If trouble occurs
When this product is subjected to strong external interference
(mechanical shock, excessive static electricity, abnormal supply
voltage due to lightning, etc.) or if it is operated incorrectly, it may
malfunction.
If such a problem occurs, do the following:
Caution:
This operation will erase all data stored in memory including clock,
timer settings, tuner preset, and CD programme.
1 Set the unit to the stand-by mode and turn the power on
again.
2 If the unit is not restored in step 1, unplug and plug in the
unit, and then turn the power on.
3 If neither step 1 nor 2 restores the unit, do the following:
Press the ON/STAND-BY button to enter the power stand-by
mode.
Unplug the AC power lead from the AC INPUT socket on the
unit.
Whilst pressing down the MEMORY/SET button and the
button, plug the AC power lead into the AC INPUT socket on
the unit.
AC INPUT
Troubleshooting Chart

– 7 –
XL-3500H
2
2
Accessories
1
1
123
Battery installation of remote control
Use 2 “AAA” size batteries (UM-4, R03, HP-16 or similar).
Batteries are not included.
Remove the Insert the batteries Replace the cover.
battery cover. as shown.
AM loop aerial x1AC power lead x1 Remote control x1
FM aerial x1Speaker wire x2
(Except for U.K.) (For U.K.)
"AAA" size battery (UM-4,
R03,HP-16 or similar)
(Except for U.K.)
2
System Connections
3
3
Right speaker
Left
speaker
Connection cable
for digital recording
(not supplied)
MD recorder
To the optical line
input socket
Wall socket
(AC 230 V, 50 Hz)
To the line
output sockets
RCA lead
(not supplied)
FM aerial
AM loop aerial VCR, DVD, etc.
TV
Right speaker Left speaker
Black
White line
Headphones
(CD only)
(Except for U.K.)
(For U.K.)
Press the ON/STAND-BY button to turn the power on.
Turn on your System
4
4
Listening to a CD
1Press the FUNCTION button until “CD STOP” appears on
the display.
If no disc is loaded, the display will be “NO DISC” instead of
“CD STOP”.
2Press the 77
77
7OPEN/CLOSE button to open the CD com-
partment.
3Place a CD on the spindle, label side up.
4Press the 77
77
7OPEN/CLOSE button to close the CD com-
partment.
The CD playback will start automatically.
FM stereo mode indicator
FM stereo receiving indicator
If trouble occurs ■
■
When this product is subjected to strong external interference (mechanical shock, excessive static
electricity, abnormal supply voltage due to lightning, etc.) or if it is operated incorrectly, it may mal-
function.
If such a problem occurs, do the following:
1. Set the unit to the stand-by mode and turn the power
on again.
2. If the unit is not restored in step 1, unplug and plug in
the unit, and then turn the power on.
3. If neither step 1 nor 2 restores the unit, do the following:
1 Press the ON/STAND-BY button to enter the power
stand-by mode.
2 Unplug the AC power lead from the AC INPUT socket
on the unit.
3 Whilstpressingdownthe MEMORY/SETbutton and the
44
44
4button, plug the AC power lead into the AC INPUT
socket on the unit.
Maintenance
Do not touch the laser pickup lens. If fingerprints or dust accu-
mulate on the pickup, clean it gently with a dry cotton swab.
AC INPUT
Listening to the Radio
1Press the FUNCTION button until “FM” or “AM” appears
on the display.
2Press the TUNING (XX
XX
Xor WW
WW
W) button to tune in to the de-
sired station.
When the TUNING button is pressed for more than 0.5 seconds, scan-
ning will start automatically and the tuner will stop at the first receivable
broadcast station.
3To receive an FM stereo
transmission:
Press the FUNCTION but-
ton to display the “ST” in-
dicator.
●
“j” will appear when an
FM broadcast is in stereo.

XL-3500H
– 8 –
1 Top Cabinet 1. Screw .................. (A1) x4 8-1,2
2. Socket ................. (A2) x9 8-2
2 Cover,Rear panel 1. Screw .................. (B1) x3 8-1
3 Chassis 1. Screw .................. (C1) x5 8-3
2. Screw .................. (C2) x4 8-1
3. Hook .................... (C3) x4 8-3
4 Tuner PWB 1. Screw .................. (D1) x1 9-1
2. Socket ................. (D2) x1
5 Terminal PWB 1. Screw .................. (E1) x2 9-1
2. Socket ................. (E2) x1
6 Rear Panel 1. Screw .................. (F1) x1 9-1
2. Socket ................. (F2) x1
7 Main PWB 1. Screw .................. (G1) x5 9-1
2. Screw .................. (G2) x2
3. Socket ................. (G3) x2
8 CD PWB 1. Flat Cable............ (H1) x1 9-2
2. Socket ................. (H2) x2
3. Screw .................. (H3) x4
9 CD Mechanism 1. Screw .................. (J1) x4 9-2
10 LED PWB 1. Screw .................. (K1) x2 9-2
11 Switch PWB 1. Hook .................... (L1) x2 9-3
2. Socket ................. (L2) x1
12 Display PWB 1. Screw .................. (M1) x6 9-3
2. Socket ................. (M2) x1
13 Gear Box 1. Hook .................... (N1) x3 9-3
DISASSEMBLY
STEP REMOVAL PROCEDURE FIGURE
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.
Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Take 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 offnylonbands orwire holderswhere theyneed to
beremovedwhendisassemblingtheunit.Afterservicing
theunit, besure torearrange theleads wheretheywere
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
Cover,Rear Panel
Top Cabinet (B1) x1
ø3 x10mm
(A1) x2
ø3 x10mm
(B1) x1
ø3 x10mm
(B1) x1
ø3 x6mm (C2) x4
ø3 x10mm
Figure 8-1
Cover,
Rear Panel
Top Cabinet
(A2) x8
(A2) x1
Bottom Cabinet
(A1) x2
ø3 x10mm
Figure 8-2
,

Hook
(C3) x4
(C1) x5
ø3 x6mm
Bottom Cabinet
Chassis
Bottom
Cabinet
Chassis
1
2
Figure 8-3

– 9 –
XL-3500H
Figure 9-1
Terminal PWB
Rear Panel
Main PWB Tuner PWB
(G1) x5
ø3 x8mm
(E1) x2
ø3 x10mm
(G2) x2
ø3 x10mm
(G3) x2
(E2) x1
(F2) x1
(D1) x1
ø3 x10mm
(D2) x1
(F1) x1
ø3 x6mm
Chassis
Figure 9-3
Display PWB
CD
Mechanism
Top Cabinet
Holder PWB
CD PWB
LED PWB
Holder,
Indicator Panel,CD
(J1) x4
ø2.5 x10mm
(H1) x1 (H2) x1
(H2) x1
(H3) x4
ø2.5 x10mm
(K1) x2
ø2.5 x10mm
Display PWB
Gear Box
Switch
PWB
Top Cabinet
(L2) x1
Hook
(L1) x2
Hook
(N1) x3
(M2) x1
(M1) x6
ø2.5 x10mm
Switch
PWB
Switch
Hook
(L1) x2
Pull Pull

Pull Pull


,

,

,

Gear Box
Hook
(N1) x3
( A3 ) x2
ø3 x12mm
( A4 ) x4
ø4 x12mm
( A2 ) x2
Special Screw
Net Frame
( A1 ) x1
( A2 ) x2
Special Screw
Woofer
Tweeter
Figure 9-2
1 Speaker 1. Net Frame ........... (A1) x1 9-4
2. Special Screw ..... (A2) x4
3. Screw .................. (A3) x2
4. Screw .................. (A4) x4
STEP REMOVAL PROCEDURE FIGURE
Figure 9-4

XL-3500H
– 10 –
How to remove the CD lid (See Fig. 10-1.)
Perform steps 1 to 13 of the disassembly method to remove
the gear box.(See page 8,9)
1. Remove the screws (A1) x 2 pcs., to remove the CD lid
motor.
2.Removethehooks(A2)x3pcs.,toremovethewormwheel.
Caution:
Be careful so that the gear is not damaged.
(The damage gear emits noise during searching.)
REMOVING AND REINSTALLING THE MAIN PARTS
Figure 10-1
Figure 10-2
(A1) x2
ø2 x3mm
Hook
(A2) x3
CD Lid Motor
Worm Wheel
CD MECHANISM SECTION (See Fig. 10-2.)
Performsteps1to 9ofthedisassemblymethodtoremovethe
CD mechanism.(See page 8,9)
1. Remove the mechanism cover, paying attention to the
pawls (A1)x 4 pcs.
2. Remove the screws (A2) x 2 pcs., to remove the shaft (A3)
x 1 pc.
3. Remove the stop washer (A4) x 1 pc., to remove the gear
(A5) x 1 pc.
4. Remove the pickup unit.
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 pretect the optical pickup
from electrostatic damage.
Pickup unit
(A2) x2
ø2.6 x6mm
(A1) x4
CD Mechanism
Shaft
(A3) x1
Gear
(A5) x1
Stop Washer
(A4) x1
Mechanism Cover

– 11 –
XL-3500H
ADJUSTMENT
TUNER SECTION
AM
GND
FM
75
OHMS
ANTENNA
TERMINAL
SO301
T302
FE301
T306
IC303
T351
VR351
TP301
FM Mute
Level AM Band
Coverage fL
AM
Tracking fL
AM IF
IC302
20
TUNER PWB-B1
Adjusting
Parts
Display
Frequency
• Setting the Test Mode
Keeping the FF/FWD button and MEMORY/SET button
pressed, turn on ON/STAND-BY. Then, the frequency is
initially set in the memory as shown in Table. Call it with the
VOLUMEUP/DOWNbuttontouseitforadjustmentandcheck
of tuner circuit.
Preset No. FM Preset No. AM
1 87.50 MHz 6 522 kHz
2 108.00 MHz 7 1,620 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
*1. Adjust so that an output signal appears.
Check Point Instrument
Connection
Display
Frequency
87.5 MHz 87.5 MHz 2.2 V ±0.7 V TP301
108 MHz 108 MHz 7.3 V ±1.0 V TP301
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
98.00 MHz 98.00 MHz VR351*1 Input: SO301
(30 dBµV) Output: Speaker
Terminal
Instrument
Connection
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected, Output: TP301
Frequency Frequency Display Setting/
Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,620 kHz T351 *1
AM Band — 522 kHz (fL): T306 *2
Coverage 1.1 ±0.1 V
AM 990 kHz 990 kHz (fL): T302 *1
Tracking
fL: Low-range frequency
fH: High-range frequency
Signal generator: 400 Hz, 30%, AM modulated
• AM IF/RF
Figure 11 ADJUSTMENT POINTS

XL-3500H
– 12 –
2. CD Test Mode (TEST 1)
In the CD test mode the operation of each step is possible even if the LID-SW is off. If focus cannot be taken in step 3 or any error
isprocessed, itis impossibleto proceed tothe next step. Duringerrorprocessing, endthetest modebypressing theON/STAND-
BY button or return to the step 1 by pressing the CD STOP button. Any other operations are inhibited.
1. Step 1 Mode
When the CD test mode is obtained, the following display lights up. Then CD initialization operation flow proceeds up to CD
STB off to wait for the following buttons to be pressed.
One second after display lights up
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY"......Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD".................After the pickup returns to the innermost periphery, it slides toward the outer periphery while this button
is pressed.
"REW/REV"..............After the pickup returns to the innermost periphery, it slides toward the inner periphery while this button
is pressed. If PICKUP IN is on, input is invalid.
"PLAY" .....................Shift to step 2
"STOP".....................Invalid
"FUNCTION"............Shift to step 5
* In case of initialization, the pickup is moved toward the inner periphery. Any buttons other than "ON/STAND-BY" button are
notaccepted untilthe shiftof pickupto theinnerperiphery iscompleted atthis time.If PICKUPINSW ONcannot bedetected
within 10 seconds, the slide motor stops, and the following error display appears. Press the ON/STAND-BY button to end
the test mode, or press the CD STOP button to return to step 1. Any other operations are inhibited.
TEST MODE
The test mode applied to this microcomputer has three modes, namely the ordinary test mode for adjustment or measurement,
the aging test mode, and the self-diagnosis test mode for self-judgment in case of final product inspection.
1. Turning on the test mode
Forobtainingeachtestmode,presstheON/STAND-BYbutton,whilekeepingpressingthefollowingtwobuttonsintheordinary
stand-bymode(poweroff). Inthiscase,themainunitbuttonsarevalid. WhenturningtheON/STAND-BYonwithremotecontrol
buttons, test modes are not obtained.
[Ordinary test mode]
1. CD Test Mode (TEST 1).....................................BASS/TREBLE + STOP
2. Tuner Test Mode (TEST 2).................................BASS/TREBLE + VOL+
3. Electronic Volume Test Mode (TEST 3)............. BASS/TREBLE + VOL–
4. Timer Test Mode (TEST 4).................................MEMORY/SET + STOP
5. LCD Test Mode (TEST 5)...................................MEMORY/SET + VOL–
6. Electric CD Lid Aging Test Mode (TEST 8)........ MEMORY/SET + VOL+
[Self-diagnosis Test Mode]
1. Button input diagnosis test mode (TEST6).…....MEMORY/SET + PLAY
Processes are different depending on destinations at initial settings.

– 13 –
XL-3500H
The time display always indicates "0:00".
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY" .....Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV" .............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY".....................Shift to step 5
"STOP" ....................Return to step 1
"FUNCTION" ...........Shift to step 5
*If the focus is not received, the process returns to step 1.
4. Step 4 Mode
TheCLVservoONcommand(8600)istransmittedtowaitforthefollowingbuttonstobepressed.(ThediscisrotatedforCLV
lock.)
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY" .....Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV" .............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY".....................If focus has been taken, shift to step 4 is executed. If not, acceptance is inhibited.
"STOP" ....................Return to step 1
"FUNCTION" ...........Shift to step 5
*If the focus is not received after it has been taken, the process returns to step 1.
3. Step 3 Mode
Whilethe laserkeeps lighting,CDinitialization operationflowproceeds upto 'CLVservoON' towaitfor thefollowing buttons
to be pressed.(Focus servo turned on for focus search)
The focus search is repeated to take focus.
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY" .....Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV" .............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY".....................Shift to step 3
"STOP" ....................Return to step 1
"FUNCTION" ...........Shift to step 5
2. Step 2 Mode
Pressthe "CDPLAY" buttonin thismode totransmit thelaser lightingcommandLDON (8400)and turnon thelaser. Any other
operations are not performed in this case.

XL-3500H
– 14 –
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY"......Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD".................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV"..............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY" .....................Invalid
"STOP".....................Return to step 1
"FUNCTION" ...........Shift to step 6
"MEMORY"..............Shift to step 7
*If the is not received, the process returns to step 1.
Other cautions
• TOC IL is not available for this test mode.
5. Step 5 Mode
When the CD initialization operation flow is completed, the mute is turned off, and playback is started. Even if playback
reaches the outermost periphery of disc, the operation does not stop. The LCD display indicates the playback passage time
as in case of ordinary CD playback.
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY"......Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD".................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV"..............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY" .....................Invalid
"STOP".....................Return to step 1
"FUNCTION" ...........Shift to step 5
"MEMORY"..............Shift to step 7
Press FF/PRESET UP or REW/PRESET DOWN button to slide the pickup. The number of errors accumulated up to that time
is cleared and addition is restarted after shift.
*If the focus is not received, the process returns to step 1.
6. Step 6 Mode
Press the FUNCTION button during step 5 operation to set EC/FC bit to "H" by PROSET command (9188 transmission) and
to monitor BUS2 (QDRE) during idle mode. The number of errors for 1 frame (1 sub-code block in IC data) is read by read
command SRC6 during "H". The number of errors accumulated in 750 frames for 10 seconds is displayed on LCD. During
the display, music signal is played back.

– 15 –
XL-3500H
Press the following buttons in this state to obtain the operations specified below.
"ON/STAND-BY"......Test mode and power turned off to shift to the ordinary standby mode.
"FF/FWD".................The pickup slides toward the outer periphery while this button is pressed.
"REW/REV"..............The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is
invalid.
"PLAY" .....................Invalid
"STOP".....................Return to step 1
"FUNCTION" ...........Shift to step 6
"MEMORY"..............Shift to step 5
*If the focus is not received, the process returns to step 1.
7. Step 7 Mode
Press "MEMORY" key during step 6 operation to display automatically adjusted values on LCD in the order as below. Item
names are displayed by left alignment, and adjusted values by right alignment in hexadecimal numbers. Operations other
than display are as same as those for step 5.
a) "Fb" is displayed on the left of LCD. FTBAST command (D480) is transmitted to designate focus balance adjusting
register. Then data read by read command SRC2 (2) are displayed in hexadecimal numbers. After waiting 2 seconds,
operation is shifted to (b).
b) "FG" is displayed on the left of LCD. FTBAST command (D481) is transmitted to designate focus gain adjusting register.
ThendatareadbyreadcommandSRC2(2)aredisplayedinhexadecimalnumbers. Theuppertwobits,whichareinvalid,
are displayed as "00". After waiting two seconds, operation is shifted to (c).
c) "Tb" is displayed on the left of LCD. FTBAST command (D482) is transmitted to designate tracking balance adjusting
register. Then data read by read command SRC2 (2) are displayed in hexadecimal numbers. After waiting 2 seconds,
operation is shifted to (d).
d)"TG"isdisplayedontheleftofLCD. FTBASTcommand(D483)istransmittedtodesignatetrackinggainadjustingregister.
ThendatareadbyreadcommandSRC2(2)aredisplayedinhexadecimalnumbers. Theuppertwobits,whichareinvalid,
are displayed as "00". After waiting 2 seconds, operation is shifted to (e).
e)"FO"isdisplayedontheleftofLCD. FTBASTcommand(D484)istransmittedtodesignatefocusoffsetadjustingregister.
Then data read by read command SRC2 (2) are displayed in hexadecimal numbers. After waiting 2 seconds, operation
is shifted to (f).
f) "TO" is displayed on the left of LCD. FTBAST command (D485) is transmitted to designate tracking offset adjusting
register. Then data read by read command SRC2 (2) are displayed in hexadecimal numbers. After waiting 2 seconds,
operation is shifted to (g).
g)"FF"isdisplayedontheleftofLCD. FTBASTcommand(D486)istransmittedtodesignateRFamplitudeadjustingregister.
Then data read by read command SRC2 (2) are displayed in hexadecimal numbers. After waiting 2 seconds, operation
is shifted to (a).

XL-3500H
– 16 –
3. Tuner Test Mode (TEST 2)
1. Outline of tuner (radio) test mode
The tuner test mode is intended to store the adjustment and measurement frequencies in the preset memory CH. When
adjusting the tuner section in the production line, adjusting personnel are not required to set frequency.
2. Details of tuner test mode
Press the "REW/PRESET DOWN" and "CD PLAY" buttons in POWER OFF state and turn on the power by the use of "ON/
STAND-BY" button to preset and store frequency for adjustment and measurement of destination specified by the AREA
terminal in the preset memory CH. However, Ordinary 1 and Ordinary 2 are stored in the destinations (selected by SPAN
switching operation) when the test mode is obtained.
("FF " + "MEMORY/SET" KEY SPAN CHANGE)
(As for frequencies to be preset and stored for each destination, refer to item 3.)
The tuner test mode is started from preset No.1.
The operations of test mode are identical with the ordinary operations of TUNER function. FUNCTION switching is invalid.
It is necessary to discard the content of preset memory when the tuner test mode is ended; be sure to write "0000" or "1111"
bits in the memory to be checked for judging memory error at initial setting and to initialize memory.
When the tuner test mode is obtained, the following display lights for one second.
• The TUNER TEST2 mode is obtained with >> + MEMORY + ON/STAND-BY. ->Turn off AC in the TEST2 mode to restore
the initial state.
Turn off POWER to protect the memory of TEST2 mode.
TurnoffPOWERagaintoobtaintheordinaryoperationwhilethedataisstoredinthememory(besides
TUNER).
If AC OFF state is maintained in this state for about 1/2 day, start is executed in the initial state.
• To clear the whole memory, insert the AC cord, pressing MEMORY + CD PLAY.
3. Preset frequencies for various destinations (random preset memory)
• The slant line sections of the table store no memory.
BAND
16-25
26 FM106.00 MHz
27 FM 90.00 MHz
28 FM FM 98.00 MHz
29 MONO FM108.00 MHz
30 FM 87.50 MHz
FM
CH
BAND
1 FM 87.50 MHz
2 FM108.00 MHz
3 FM FM 98.00 MHz
4 STEREO FM 90.00 MHz
5 FM106.00 MHz
FM
CH BAND
6 AM 522 kHz
7 AM1620 kHz
8 AM AM 990 kHz
9 AM 603 kHz
10 AM1404 kHz
AMCH

– 17 –
XL-3500H
4. Electronic volume Test Mode (TEST 3)
When this test mode is obtained, the following display lights for one second.
Inthismode,volumeis-14dB(STEP28),BASS/TREBLEissetto0(0dB)andSURROUNDmodetoOFF,andstart-upfunction
to CD, respectively. The button operations in the test mode are the same as those of ordinary operation except volume UP/
DOWN.
(1) The display is the same as that of ordinary operation except test mode setting.
(2) Unlikethe ordinarystate, thevolume iscontrolled withthevolume UP/DOWNbutton inaccordance withthefollowing three
steps.
Volume- ∞(STEP 0) <-> Volume-14 dB (STEP 23) <-> Volume-0 (STEP 30)
(3) BASS/TREBLE and SURROUND are switched when button is pressed..
Set the current time and timer time according to the following procedure to reproduce the timer.
1.Set the current time to 1:00, the timer to ON time 1:05, the function to CD, and volume to STEP 12, respectively. One minute
is counted as one second, and the timer is reproduced. The fade-in (when playback is started) is executed at a rate of one step
for 1 sec. After completion of fade-in, the fade-out is executed at a rate of one step for 1 sec (WAIT 1 sec inserted).
After completion of fade-out, the power is turned off (after WAIT 1 sec), and the mode is shifted to the standby.
The display during operation is the same as that of ordinary timer operation.
5. Timer test Mode (TEST 4)
When this test mode is obtained, the following display lights for one second.
6. LCD Test Mode (TEST 5)
When the LCD test mode is obtained, all the LCD segments are lighted. Then pressing the "PLAY" button switches display as
below.
Lighting of all segments Lighting of odd segments Lighting of even segments

XL-3500H
– 18 –
Thistestmodeisintendedtocheckwhetherallthemainunitbuttonscanbedetected. Accordingly,inthistestmode,itischecked
whether the "ON/STAND-BY" button was pressed after all the buttons shown below were pressed. If the result is OK, OK is
displayed. If any one of keys was not pressed, an error is displayed. In both cases of OK termination or error termination, the
mode is shifted to the standby mode if the "ON/STAND-BY" button is pressed subsequently.
Allmodelsusingthistypeofmicrocomputerarenotalwaysprovidedwiththesamebuttons. Sincethebuttonsusedaredifferent
depending on models, types of buttons to be used are determined by whether RDS, SURROUND, and an electric lid are
available at the initial setting by MODEL port.
The order of buttons to be pressed is not determined. Accordingly, it is checked whether all buttons have been pressed.
1. PU-IN buttons: REW/PRESET DOWN + CD STOP
Since this model is provided with SURROUND (HAVE OR NOT), RDS (HAVE OR NOT), and electric CD lid, the following
10 buttons are detected as all buttons.
PLAY, BASS/TREBLE, FUNCTION, VOLUME UP/DOWN, MEMORY/SET, REW, FF, STOP, CD-OPEN/CLOSE
The OK/NG display of test result is as follows.
7. Button input diagnosis Test Mode (TEST 6)
When the test mode is obtained, the following is displayed.
a. POWER ON for function AUX
CD lid position is checked.
CLOSE position: Operation proceeds to the next process.
Position other than CLOSE: After the lid moves to CLOSE, operation proceeds to the next process.
b. CD lid operation started
OPEN operation
WAIT 1 second
CLOSE operation
WAIT 1 second
c. Operations above are repeated.
Specified monitoring time
OPEN operation: 5 seconds
CLOSE operation: 5 seconds
8. Electric CD lid Aging Test Mode (TEST 8) (Only for model with electric CD lid)
Outline
OPEN/CLOSE operations of electric CD lid are repeated. The number of repeated times and time period are monitored. If the
liddoesnotmovetotheregularpositionafterthespecifiedtime,operationisstopped.Whenanerrorisdetectedby[CLID_PRO]
during CLOSE, operation is also stopped.
d. Display
OPEN>CLOSE is counted as 1. 1 to 59999 are counted; if the count is over
59999, display is returned to 0 to repeat counting.
Displaywhen thelid doesnot moveto theregularposition afterthe specified
time
(Ex: Defective operation occurring in the middle of 1538.)
Highlight display of stop when an error is detected by [CLID-PRO]
(Ex: Defective operation occurring in the middle of 1538.)

– 19 –
XL-3500H
SW702 PICKUP IN ON—OFF
SW709 ON/STAND-BY ON—OFF
SW710 CD LID OPEN/CLOSE ON—OFF
SW711 REW/PRESET DOWN ON—OFF
SW712 FF/PRESET UP ON—OFF
SW713 CD STOP/TUNING DOWN ON—OFF
SW718 CD PLAY/PAUSE/TUNING UP ON—OFF
•The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas-
sis with no signal given.
1. In the tuner section,
( ) : AM mode
: FM stereo mode
2. In the CD section, the CD is stopped.
•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.
NOTES ON SCHEMATIC DIAGRAM
•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 micro-micro-farad and the unit of the
capacitor without such a symbol is microfarad. As to
electrolyticcapacitor,theexpression“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.
REF. NO DESCRIPTION POSITION POSITIONREF. NO DESCRIPTION
SW719 VOLUME DOWN ON—OFF
SW720 VOLUME UP ON—OFF
SW725 BASS/TREBLE ON—OFF
SW726 MEMORY/SET ON—OFF
SW727 CLEAR ON—OFF
SW728 FUNCTION ON—OFF
SW802 CD LID ON—OFF
ECB
(S)(G)(D)
FRONT
VIEW
FRONT
VIEW
BCE
FRONT
VIEW
2SB562 C
2SC380 O
2SC535 C
2SK2541
KRA102 M
KRA107 M
KRC102 M
KRC104 M
KRC107 M
KTA1266 GR
KTC3199 GR
KTC3200 GR 2SD2012 Y LP99B
LP3052D SVC348S
1 2 3
(1) (2) (3)
Figure 19 TYPES OF TRANSISTOR AND LED

XL-3500H
– 20 –
WAVEFORMS OF CD CIRCUIT
NO DISC FOCUS SEARCH STOP PLAY
FOO 1 TMAX 1
IC801 33pin
FO+ 2 SBOK 2
IC803 26pin IC801 8pin
FO- 3 DMO 3
IC803 25pin IC801 41pin
FOCUS SEARCH TOC IL STOP PLAY
SEL 1 TEI 1
IC801 38pin
FEI 2 TRO 2
IC801 29pin IC801 34pin
TEI 3 FMO 3
IC801 31pin IC801 40pin
STOP PLAY CUE
FEI 1 TEI 1
IC801 29pin
SBAD 2 TRO 2
IC801 30pin IC801 34pin
RFO 3 FMO 3
IC802 22pin IC801 40pin
STOP PLAY REVIEW
FEI 1 TEI 1
IC801 29pin
RFGO 2 TRO 2
IC802 19pin IC801 34pin
RFRP 3 FMO 3
IC802 17pin IC801 40pin
STOP PLAY TCD-782 TNO-02 PLAYBACK
TEI 1LO 1
IC801 31pin
TRO 2
IC801 34pin
RO 2
SBAD 3
IC801 30pin
1
2
3
4
6
7
11
15
16
17
IC801 53pin
IC801 31pin
IC801 31pin
IC801 31pin
IC801 16pin
5
6
5
7
8
5
9
10
6
11
12
13
14
6
11
15
6
11
15
IC801 50pin