Sharp XL-55 User manual

– 1 –
XL-55/55C
CONTENTS
Page
IMPORTANT SERVICE NOTES (FOR U.S.A. ONLY) ..................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................ 2
NAMES OF PARTS .......................................................................................................................................................... 3
DISASSEMBLY................................................................................................................................................................. 4
REMOVING AND REINSTALLING THE MAIN PARTS.................................................................................................... 5
ADJUSTMENT.................................................................................................................................................................. 7
TEST MODE ..................................................................................................................................................................... 8
ERROR LIST .................................................................................................................................................................. 12
NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................. 13
TYPES OF TRANSISTOR AND LED.............................................................................................................................. 13
BLOCK DIAGRAM .......................................................................................................................................................... 14
SCHEMATIC DIAGRAM ................................................................................................................................................. 18
WIRING SIDE OF P.W.BOARD...................................................................................................................................... 25
WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 30
TROUBLESHOOTING .................................................................................................................................................... 31
FUNCTION TABLE OF IC .............................................................................................................................................. 37
LCD SEGMENT .............................................................................................................................................................. 44
PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET (FOR U.S.A. ONLY)
XL-55
SERVICE MANUAL
SHARP CORPORATION
No. S1308XL55////
• 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-55MicroComponentSystemconsistingofXL-55(mainunit)
and CP- XL55 (speaker system).
MODEL
MICRO COMPONENT SYSTEM
XL-55C
XL- 55C Micro Component System consisting of XL- 55C (main
unit) and CP- XL55 (speaker system).
MODEL
Illustration XL-55

XL-55/55C
– 2 –
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
IMPORTANT SERVICE NOTES (FOR U.S.A. ONLY)
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 pinched
orthathardwareisnotlodgedbetweenthechassisandothermetal
parts in the audio product.
2. Inspectallprotectivedevicessuchasinsulatingmaterials,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.
* Usingtwoclipleads,connecta1.5kohm,10wattresistorparalleled
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
tomeasuretheACvoltagedropacrosstheresistor(Seediagram).
* Connect the resistor connection to all exposed metal parts having
areturnpathtothechassis(antenna,metalcabinet,screwheads,
knobs and control shafts, escutcheon, etc.) and measure the AC
voltage drop across the resistor.
All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.)
or more is excessive and indicates a potential shock hazard which
must be corrected before returning the audio product to the owner.
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
TEST PROBE
0.15 µ F
1.5k ohms
10W
VTVM
AC SCALE
SPECIFICATIONS
■General
■Amplifier (Except for Canada)
■Tuner
■CD player
■Cassette deck
■Speaker
Power source AC 120 V, 60 Hz
Power
consumption 48 W
Dimensions Width: 6-5/16" (160 mm)
Height: 9-1/2" (240 mm)
Depth: 11-11/16" (296 mm)
Weight 7.9 lbs. (3.6 kg)
Output power 20 watts minimum RMS per channel into 4
ohms from 100 Hz to 20 kHz, 10% total har-
monic distortion
Output terminals Speakers: 4 ohms
Headphones: 16 - 50 ohms (recommended:
32 ohms)
CD digital output (optical)
Subwoofer (Audio signal): 500 mV/47 k
ohms
Input terminals Video/Auxiliary (audio signal): 500 mV/47 k
ohms
Frequency range FM: 87.5 - 108 MHz
AM: 530 - 1,720 kHz
Type Compact disc player
Signal readout Non-contact, 3-beam semiconductor laser
pickup
D/A converter 1-bit D/A converter
Frequency
response 20 - 20,000 Hz
Dynamic range 90 dB (1 kHz)
Frequency
response 50 - 14,000 Hz (normal tape)
Signal/noise ratio 50 dB (recording/playback)
Wow and flutter 0.25 % (WRMS)
Type 2-way type speaker system
Tweeter
4" (10 cm) Woofer
Maximum input
power 40 W
Rated input power 20 W
Impedance 4 ohms
Dimensions Width: 6-5/16" (160 mm)
Height: 9-1/2" (240 mm)
Depth: 7-7/8" (200 mm)
Weight 4.7 lbs. (2.1 kg)/each
■Amplifier (For Canada)
Output power RMS: 40 W (20 W + 20 W) (10 % T.H.D.)
Output terminals Speakers: 4 ohms
Headphones: 16 - 50 ohms (recommended:
32 ohms)
CD digital output (optical)
Subwoofer (Audio signal): 500 mV/47 k
ohms
Input terminals Video/Auxiliary (audio signal): 500 mV/47 k
ohms
Specifications for this model are subject to change without
prior notice.

– 3 –
XL-55/55C
NAMES OF PARTS
1.CD Compartment
2.CD Eject Button
3.Volume Control
4.Cassette Compartment
5.Headphone Jack
6.Power On/Stand-by Button
7.Function Selector Button
8.CD or Tape Stop, Tuning Down Button
9.CD Play or Pause, Tape Play,
Tuning Up Button
10.Bass/Treble Selector Button
11.Memory/Set Button
12.Tape Record Pause Button
13.CD Track Down or Fast Reverse, Tape Rewind,
Tuner Preset Down Button
14.CD Track Up or Fast Forward, Tape Fast Forward,
Tuner Preset Up Button
15.Timer Play Indicator
16.Tape Record Indicator
17.Sleep Indicator
18.CD Random Play Indicator
19.Memory Indicator
20.FM Stereo Mode Indicator
21.FM Stereo Receiving Indicator
22.Surround Indicator
23.CD Play Indicator
24.CD Repeat Play Indicator
25.CD Digital Output Jack
26.AC Power Input Jack
27.FM/AM Loop Antenna Jack
28.Video/Auxiliary (Audio Signal) Input Jacks
29.Subwoofer Output Jack
30.Speaker Terminals
15
1
2
3
4
5
17 18 19 20
24
23 21
16
22
26
6
10
789
11 12 13 14
28
30
29
27
25
1.Tweeter
2.Woofer
3.Speaker Wire
4.Remote Control Transmitter
5.Clock Button
6.Power On/Stand-by Button
7.CD Button
8.Tuner and Band Selector Button
9.Clear Button
10.Memory Button
11.CD Track Down, Tuner Preset Down Button
12.CD Fast Reverse, Tuning Down,
Tape Rewind Button
13.CD or Tape Play Button
14.Surround Button
15.CD or Tape Stop Button
16.Volume Up and Down Buttons
17.Bass Up and Down Buttons
18.Timer Button
19.Sleep Button
20.Video/Auxiliary Button
21.Tape Button
22.Repeat Button
23.Random Button
24.CD Track Up, Tuner Preset Up Button
25.CD Fast Forward, Tuning Up,
Tape Fast Forward Button
26.Tape Record Pause Button
27.CD Pause Button
28.Treble Up and Down Buttons
Buttons with " " mark in the illustration can be operated on the re-
mote control only.
32
1
4
5
16
17
618
28
19
20
21
23
24
25
26
27
22
7
8
9
10
11
12
13
15
14
Speaker grilles are removable:
Make sure nothing comes into contact with the
speaker diaphragms when you remove the
speaker grilles.

XL-55/55C
– 4 –
1 Top Cabinet 1. Screw .................. (A1) x5 4-1
2. Socket ................. (A2) x2 4-1,3
2 Side Panel (Left/Right) 1. Screw .................. (B1) x4 4-1
3 Rear Panel 1. Screw .................. (C1) x2 4-1
2. Screw .................. (C2) x2 4-2
4 Power Amp. PWB 1. Screw .................. (D1) x1 4-2
2. Socket ................. (D2) x1
3. Socket ................. (D3) x1
5 Main PWB/ 1. Screw .................. (E1) x4 4-3
Headphones PWB 2. Socket ................. (E2) x4
3. Socket ................. (E3) x1
6 Front Panel 1. Screw .................. (F1) x2 4-4
2. Socket ................. (F2) x2
7 Power PWB 1. Screw .................. (G1) x2 4-4
2. Shield Cover ....... (G2) x1
3. Screw .................. (G3) x5
8 Tape Mechanism 1. Screw .................. (H1) x4 4-5
9 Display PWB 1. Knob .................... (J1) x1 4-5
2. Screw .................. (J2) x8
10 CD PWB(Note)/ 1. Screw .................. (K1) x4 5-1
Open Close Switch PWB 2. Screw .................. (K2) x2
Jack PWB 3. Socket ................. (K3) x3
11 CD Mechanism 1. Screw .................. (L1) x3 5-2
DISASSEMBLY
STEP REMOVAL PROCEDURE FIGURE
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 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 nylonbands orwire holders wherethey need to
beremovedwhendisassemblingtheunit.Afterservicing
theunit, be sureto rearrange theleads where theywere
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
(E1)x1
ø3x10mm
(E1)x1
ø3x10mm
(E1)x1
ø3x10mm
(E1)x1
ø3x10mm
(E2)x2
(A2)x1
(E2)x2 (E3)x1
Main PWB
Power PWB
Tape
Mechanism
PWB Headphones
PWB
Side Panel
(Right)
Rear Panel
(C1)x1
ø3x10mm
(C1)x1
ø3x10mm
Side Panel
(Lift)
(A1)x1
ø3x10mm
(A1)x2
ø3x10mm
(A1)x1
ø3x10mm
(A1)x1
ø3x10mm
(A2)x1
(B1)x2
ø3x10mm
(B1)x2
ø3x10mm
Top Cabinet
CD PWB
(C2)x2
ø3x10mm
(D1)x1
ø3x10mm
(D2)x1
Rear Panel
(D3)x1
Main PWB
Power Amp. PWB
Power PWB
Shield
Cover
Bracket,
Shield Cover
(G3)x4
ø4x10mm
(G1)x2
ø3x6mm
(G2)x1
(F1)x1
ø3x10mm (F1)x1
ø3x10mm (G3)x1
ø3x10mm
(F2)x1
(F2)x1
Power
PWB
Front Panel
Figure 4-1
Figure 4-2
Figure 4-3
Figure 4-5
Note:
After removing the connector for the optical pickup from the
connector,wraptheconductivealuminiumfoilaroundthefrontend
of the connector so as to protect the optical pickup from electro-
static damage.
Figure 4-4
(J2)x8
ø2.6x10mm
(H1)x4
ø2.6x10mm
(J1)x1
Front Panel Display PWB
Tape
Mechanism
Open
Cassette
Holder

– 5 –
XL-55/55C
TAPE MECHANISM SECTION
Perform steps 1 to 6 and 8 of the disassembly method to
remove the tape mechanism. (See page 4.)
How to remove the record / playback and erase
heads (See Fig. 5-3.)
1. Remove the screws (A1) x 2 pcs., to remove the erase
head.
2. Remove the screws (A2) x 2 pcs., to remove the record/
playback head.
Note:
After replacing the heads and performing the azimuth
adjustment, be sure to apply screwlock.
How to remove the pinch roller (See Fig. 5-4.)
1. Carefully bend the pinch roller pawl in the direction of the
arrow <A>, and remove the pinch roller (B1) x 1 pc.,
upwards.
How to remove the belts (See Fig. 5-5.)
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:
Whenputtingonthe belt,ascertainthatthebelt isnottwisted,
and clean it.
How to remove the motor
(See Fig. 5-6.)
1. Remove the main belt.
2. Remove the screws (D1) x 2 pcs., to remove the motor
bracket.
3. Remove the screws (D2) x 3 pcs., to remove the motor.
Note:
Whenmountingthemotor,payattentiontothemotormounting
angle.
<A>
Pinch Roller
(B1)x1 Pinch Roller
Pawl
REMOVING AND REINSTALLING THE MAIN PARTS
Main Belt
(C1)x1
FF/REW Belt
(C2)x1
REW/FF
Clutch
Motor
Erase Head
Record/
Playback Head
(A1)x2
ø2x8mm
(A2)x1
ø2x3mm
(A2)x1
ø2x7mm
(D1)x1
ø2x4mm
(D2)x3
Special
Screw
Motor
Bracket
Motor
Motor
(D1)x1
ø2x4mm
(K1)x4
ø2.4x10mm
(K2)x1
ø2.6x10mm
(K2)x1
ø2.6x10mm
(K3)x2
(K3)x1
Top Cabinet
CD PWB
Open/Close
Switch PWB
Jack
PWB
CD Mechanism
Figure 5-1 Figure 5-2
Figure 5-3
Figure 5-4
Figure 5-5
Figure 5-6
(L1)x3
ø2.6x10mm
Top Cabinet
CD Mechanism

XL-55/55C
– 6 –
How to remove the pickup (See Fig. 6-3)
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.
CD MECHANISM SECTION
Perform steps 1, 10 and 11 of the disassembly method to
remove the CD mechanism. (See page 4.)
Pickup Unit
(A2) x2
ø2.6 x6mm
(A1) x2
CD Mechanism
Shaft
(A3) x1
Gear
(A5) x1
StopWasher
(A4) x1
Mechanism Cover
(A1) x2
How to remove the tape mechanism PWB
(See Fig. 6-2.)
1. Remove the screw (F1) x 1 pc., to remove the tape
mechanism PWB.
2. Remove the screw (F2) x 1 pc.
3. Remove the solder joints (F3) x 2 pcs., to remove the tape
mechanism PWB.
How to remove the flywheel (See Fig. 6-1.)
1. Remove the belt.
2.Removethestopwasher(E1)x1pc.,withasmallprecision
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
Installeach partin the reverse order ofthe removalwith care.
Stop
Washer Driver
(E1)x1
Stop Washer
Mechanism
Chassis
Washerx2
Flywheel
Tape
Mechanism
PWB Tape
Mechanism
PWB
(F3)x2
Solder
Joint
(F2)x1
ø2x8mm
(F1)x1
ø2x3mm
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.
Figure 6-1
Figure 6-2
Figure 6-3

– 7 –
XL-55/55C
MECHANISM SECTION
• Driving Force Check
Torque Meter Specified Value
Play: TW-2412 Over 80 g
• Torque Check
Torque Meter
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
Specified
Value
Adjusting
Point Instrument
Connection
Test Tape
ADJUSTMENT
Specified Value
• Tape Speed
TUNER SECTION
MTT-111 Variable 3,000 ±Headphone
resistor in 90 Hz terminal
motor.(M901)
Check Point Instrument
Connection
Display
Frequency
87.5 MHz 87.5 MHz 3.4 V ±1.0 V TP301
108 MHz 108 MHz 7.8 V ±1.0 V TP301
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
IF 450 kHz 1,602 kHz T351 *1
AM Band — 531 kHz (fL): T306 *2
Coverage 1.1 ±0.1 V
AM 990 kHz 990 kHz T302 *1
Tracking
fL: Low-renge frequency
fH: High-renge frequency
Signal generator: 400 Hz, 30%, AM modulated
• AM IF/RF
Adjusting
Parts Instrument Connection
Display
Frequency
98.00 MHz 98.00 MHz VR351*1 Input: CNP301
(30 dBµV) Output: Speaker
Terminal
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
FM Band — 87.50 MHz (fL): L303 *1
Coverage 3.4 ±0.1 V
FM RF 98.00 MHz 98.00 MHz L302 *2
(10~30 dB)
Test Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
• FM Detection
Signal generator: 10.7 MHz, FM sweep generator
FM IF 10.7 MHz 98.00 MHz T304(Turn Input: Pin 1 of
the core of IC301
T304 fully
counter-
clockwise).
Test
Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
*1. Adjust so that an output signal appears.
TAPE MECHANISM
M901
Tape
Motor
Variable
resistor
in motor
IC303
IC302
CF352
R336
T306
VR351
T302
T304
L303
IC301
L302
BF301
T351
1
9
MAIN PWB
ANTENNA
SOCKET
FM Mute
Level
AM IF
TP301
CNP301
AM
Tracking
AM Band
Coverage fL
FM Band
Coverage fL
FM OSC.
AM OSC.
FM RF
FM IF
Figure 7-1 ADJUSTMENT POINT
Figure 7-2 ADJUSTMENT POINTS
*1. Input: Antenna Output: Speaker terminal
*2. Input: Input is not connected Output: TP301

XL-55/55C
– 8 –
2. CD Test Mode (TEST 1)
In the CD test mode the operation of each step is enabled even when the LID-SW is off. However, if focus cannot be set in step 3 or any
error processing is started, it is impossible to proceed to the next step. When the error processing is started, operations other than
terminationoftestmodebypressingthePOWERON/STAND-BYbuttonorreturntothestep1bypressingtheSTOPbuttonareinhibited.
1. Step 1 Mode
When the CD test mode is turned on, the following indication lights, the processing (until turning-off of CD STB terminal of CD
initialization operation flow) is executed, and the next button input is waited.
After lighting for one second
If the following operation buttons are pressed in this state, the operation is performed as follows.
"
POWER ON/STAND-BY "...The test mode is turned off, the power is turned off, and the ordinary stand-by mode is set.
"FF/FWD".................After the pickup returns once to the innermost periphery, it slides toward the outer periphery while this
button is held down.
"REW/REV"..............After the pickup returns once to the innermost periphery, it slides toward the inner periphery while this
button is pressed. However, if PU-IN is on, input is invalid.
"PLAY" .....................Shift to step 2
"STOP".....................Invalid
"REC PAUSE"..........Shift to step 5
TEST MODE
The test mode applied to this microcomputer has three modes, namely ordinary test mode to be used for adjustment or
measurement, aging test mode to be used for aging test, and self-diagnosis test mode for self-inspection in case of final product
inspection.
1. Turning on the test mode
To turn on the specific test mode, press the POWER ON/STAND-BY button, holding down the following two buttons in the
ordinarystand-bymode(poweroffstate).Inthiscaseonlythemainunitbuttonisvalid.EvenwhenthePOWERofremotecontrol
button is set to on, the test mode is not turned on.
[Ordinary test mode]
1. CD Test Mode (TEST 1)…………………… BASS/TREBLE + FF/FWD
2. Tuner Test Mode (TEST 2)………………… BASS/TREBLE + REW/REV
3. Electronic volume Test Mode (TEST 3)……BASS/TREBLE + REC
4. Timer Test Mode (TEST 4)………………… MEMORY/SET + REC
5. LCD Test Mode (TEST 5)……………………MEMORY/SET + REW/REV
MEMORY/SET + PLAY
[Self-diagnosis Test Mode]
1. Button input diagnosis test mode (TEST6).…
• Setting the Test Mode
Keeping the REW/REV button and BASS/TREBLE button
pressed, turn on POWER. Then, the frequency is initially set
in the memory as shown in Table. Call it with the PRESET
button to use it for adjustment and check of tuner circuit.
Preset No. FM STEREO Preset No. AM
1 87.50 MHz
2 108.00 MHz
3 98.00 MHz
4 90.00 MHz
5 106.00 MHz
11~25 ––––
6 531 kHz
7 1,602 kHz
8 990 kHz
9 603 kHz
10 1,404 kHz
Preset No. FM MONO
26 106.00 MHz
27 90.00 MHz
28 98.00 MHz
29 108.00 MHz
30 87.50 MHz

– 9 –
XL-55/55C
The time display indicates always "0:00".
When the following buttons are pressed in this state, the operation is executed as follows.
" POWER ON/STAND-BY " ..The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.
"REW/REV" .............The pickupslides towardtheinner peripherywhilethis buttonisheld down.However,if PU-INison, input
is invalid.
"PLAY".....................Shift to step 5
"STOP" ....................Return to step 1
"REC PAUSE" .........Shift to step 5
*If the focus is disturbed, the process returns to step 1.
4. Step 4 Mode (Only focus "OK" can make this item showing)
TheCLVservo ONcommand (8600)sendingoperation isperformed,and thenext buttoninputis waited.(The disc isrotated
to perform CLV locking.)
When the following operation buttons are pressed in this state, the operation is executed as follows.
"
POWER ON/STAND-BY " ..The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.
"REW/REV" .............The pickupslides towardtheinner peripherywhilethis buttonisheld down.However,if PU-INison, input
is invalid.
"PLAY".....................Ifthefocus has beenset, shiftto step 4is executed. Ifthe focus hasnot beenset, acceptance isinhibited.
"STOP" ....................Return to step 1
"REC PAUSE" .........Shift to step 5
*If the focus is disturbed after it has been set, the process returns to step 1.
3. Step 3 Mode
The laser is kept lighting. The processing (until turning-on of CLV servo of CD initialization operation flow) is executed, and
the next button input is waited. (The focus servo is turned on, and focus search is performed.)
The focus search is repeated until the focus is set.
If the following buttons are pressed in this state, the operation is performed as follows.
"
POWER ON/STAND-BY " ..The test mode is turned off, the power is turned off, and the ordinary stand-by mode is set.
"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.
"REW/REV" .............The pickupslides towardtheinner peripherywhilethis buttonisheld down.However,if PU-INison, input
is invalid.
"PLAY".....................Shift to step 3
"STOP" ....................Return to step 1
"REC PAUSE" .........Shift to step 5
2. Step 2 Mode
When the "PLAY" button is pressed in this mode, the laser lighting command LDON (8400) is sent, and the laser is turned on.
Other operations are not performed.
*Incaseofinitializationthepickup ismovedtowardtheinnerperiphery.Anybuttons otherthanPOWERON/STAND-BYbutton
are not accepted until the shift of pickup to the inner periphery is completed at this time. If PU-IN SW ON cannot be detected
within 10 seconds, the slide motor is stopped, and the following error indication appears. Press the POWER ON/STAND-BY
button to end the test mode, or press the STOP button to return to step 1. Any other operations are inhibited.

XL-55/55C
– 10 –
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 without
frequency setting by adjusting personnel when the tuner section is adjusted in the production line.
2. Details of tuner test mode
When the power is turned on by using the POWER ON/STAND-BY button while the BASS/TREBLE and REW/REV buttons
are held down in POWER OFF state, the frequency for adjustment and measurement of destination specified by the AREA
terminal is preset and stored in the preset memory CH. However, Ordinary 1 and Ordinary 2 are set to the designation
(destination selected by SPAN switching operation) set when the test mode is obtained.(Memory/Set+Function Key Span
Charged) (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. However, FUNCTION switching
is invalid.
Since it is necessary to discard the content of preset memory when the tuner test mode is ended, "0000" or "1111" bits are
writteninthememorytobecheckedincaseofmemorycheck(incaseofinitialsetting)sothatmemoryabnormalityisdetected
in case of initial setting so as to ensure memory initialization.
When the tuner test mode is turned on, the following indication lights for one second.
•
The TUNER TEST2 mode is set as a result of BASS/TREBLE+ REW/REV. -> POWER OFF -> IF AC is set to OFF in the TEST2
mode, the initial state is restored.
When POWER is set to OFF, the memory of TEST2 mode is protected.
When the power is turned on again, the ordinary operation is enabled while the data is stored in the
memory (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, holding down MEMORY + STOP.
When the following operation buttons are pressed in this sate, the operation is executed as follows.
"
POWER ON/STAND-BY "...The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD".................The pickup slides toward the outer periphery while this button is held down.
"REW/REV"..............Thepickupslides toward theinner periphery whilethis button isheld down. However,if PU-IN ison, input
is invalid.
"PLAY" .....................Invalid
"STOP".....................Return to step 1
*If the focus is disturbed, the process returns to step 1.
Other cautions
• TOC IL is not executed in the test mode.
• As for button operations other than those shown above, only the sound volume operation (with JOG) is accepted.
5. Step 5 Mode
The CD initialization operation flow is executed to the end, the mute is set to off, and playback is started. Even when the
playback reaches the outermost periphery of disc, the operation does not stop. The LCD display indicates the playback past
time as in case of ordinary CD playback.

– 11 –
XL-55/55C
3. Preset frequencies for various destinations (random preset 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
Europe 2, 4
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
Europe 2, 4
CH BAND
6 AM 531 kHz
7 AM1602 kHz
8 AM AM 990 kHz
9 AM 603 kHz
10 AM1404 kHz
11-15 LW
Europe 2, 4CH
• The hatched sections of the table are not stored in memory.
4. Electronic volume Test Mode (TEST 3)
When the test mode is set, the following indication lights for one second.
When this mode is set, BASS/TREBLE is set to 0 (0 dB) and start-up function is set to CD when volume is -14 dB (STEP 23).
The button operations in the test mode are the same as those of ordinary operation excepting sound volume UP/DOWN.
(1) The indication is the same as that of ordinary operation excepting test mode setting.
(2) The sound volume control with the sound volume UP/DOWN button is only the following 3 steps unlike the ordinary state.
Volume- ∞(STEP 0) <-> Volume-14 dB (STEP 23) <-> Volume-0 (STEP 30)
(3) BASS/TREBLE is switched when button operation is performed.
The current time and timer time are set in the following procedure to perform the timer playback.
1.Setthecurrenttimeto1:00,setthetimertoONtime1:05,setthefunctiontoAux,andsetvolumeSTEP12.Oneminuteiscounted
as one second, and the timer playback operation is performed. The fade-in (when playback is started) is executed at a rate of
onestep for1 sec.After completionof fade-in the fade-out isexecuted ata rateof onestep for1 sec (WAIT1 secinserted). After
completion of fade-out the power is turned off (after WAIT 1 sec), and the mode is changed to the standby mode.
The indication during operation is the same as that of ordinary timer operation.
5. Timer test Mode (TEST 4)
When the test mode is set, the following indication lights for one second.
6. LCD Test Mode (TEST 5)
When the LCD test mode is set, all the LCD segments are lighted. After that the indication is changed as follows according to
the "PLAY" button input.
Lighting of all segments Lighting of odd segments Lighting of even segments

XL-55/55C
– 12 –
7. Key input diagnosis Test Mode (TEST 6)
When the test mode is set, the following indication appears.
ERROR LIST
PU-IN SW detection error
CD read error
Error content ........... Disc data cannot be read properly or
even if it can be read, the disc is not a
playable one.
Probable cause....... Thediscisloadedupsidedown,notCD-
DA, scratches, stains, etc.
Action ...................... Open the CD lid, then reload the disc
correctly.Removethescratchesorstains
on the disc.
NO DISC
Tape mechanism error 1
Tape mechanism error 2
Error content ............The detection SW cannot detect ON
after a fixed period of time even if the
microcomputer controls the CD pickup
to return to the innermost position.
Probable cause........Defective or poorly connected PU-IN
SW or slide motor.
Action .......................Solvetheproblemandturnonthepower
again.
Error content ........... Focusing is impossible.
Probable cause....... Thediscisloadedupsidedown,notCD-
DA, scratches, stains, etc.
Action ...................... Open the CD lid, then reload the disc
correctly.Removethescratchesorstains
on the disc.
Error content ........... The detection SW "CAM-SW" cannot
detectON(mechanisminoperation)even
if the motor and solenoid are controlled
to play back, fast forward, rewind, or
record the tape.
Probable cause....... Mechanism is in operation when this
message appears: Defective or poorly
connectedCAM-SW.Mechanismstops:
Defective or poorly connected motor or
solenoid.
Action ...................... Solvetheproblemandturnonthepower
again.
Error content ........... Initialization cannot be completed when
the microcomputer controls the motor
and solenoid to initialize the tape
mechanism(tosetthemechanismtothe
stop mode). The detection SW "CAM-
SW" cannot detect OFF While the
mechanism is in operation.
Probable cause....... Mechanism is in operation when this
message appears: Defective or poorly
connectedCAM-SW.Mechanismstops:
Defective or poorly connected motor or
solenoid.
Action ...................... Solvetheproblemandturnonthepower
again.
This test mode is intended to check whether all the main unit buttons can be detected. Accordingly, in this test mode checking as to
whether the "POWER ON/STAND-BY" button was pressed after all the buttons shown below were pressed is performed. If the result
is OK, OK is indicated. Even any one of keys was not pressed, an error is indicated. In case of OK termination or error termination
exit from this mode occurs when the "POWER ON/STAND-BY" button is pressed next time, and the standby mode is set.
1. In case of "MEMORY/SET" + "PLAY"+ "POWER ON/STAND-BY"
Since SURROUND and RDS are not provided, the following 9 buttons are detected as all buttons.
PLAY, POWER ON/STAND-BY, BAND, BASS/TREBLE, FUNCTION, MEMORY/SET, REC PAUSE, REW, FF, STOP.
The OK/NG indication of test result is as follows.

– 13 –
XL-55/55C
SW700 VOLUME ON—OFF
SW701 POWER ON/STAND-BY ON—OFF
SW702 FUNCTION ON—OFF
SW703 STOP/CLEAR,TUNING DOWN ON—OFF
SW704 PLAY/CD PAUSE,TUNING UP ON—OFF
SW705 BASS/TREBLE ON—OFF
SW706 MEMORY/SET 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,
( ) indicates AM
< > indicates FM stereo
2. In the main section, a tape is being played back.
3. In the deck section, a tape is being played back.
( ) indicates the record state.
4. In the power section, a tape is being played back.
5. 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
SW707 REC/PAUSE ON—OFF
SW708 REW/PRESET DOWN ON—OFF
SW709 FF/PRESET UP ON—OFF
SW800 PICKUP IN ON—OFF
SW801 CD LID OPEN/CLOSE ON—OFF
SW901 FOOL PROOF ON—OFF
SW902 CAM ON—OFF
ECB
(S)(G)(D)
(1) (2) (3)
FRONT
VIEW
FRONT
VIEW
BCE
FRONT
VIEW
2HA1015 GR
2HC1815 GR
2SC2001 K
2SK2541
HSB562 C
KRA102 M
KRA107 M
KRC102 M
KRC104 M
KRC107 M
SC1674 C KTC2026 Y MPG3372X SVC348S
KDV147B
1 2 3
TYPES OF TRANSISTOR AND LED
Figure 13 TYPES OF TRANSISTOR AND LED

XL-55/55C
– 14 –
REC MUTE
Q105
Q106 REC
150K
150K
MUTE ALC
+
-
-
+
3 1
5
11 12
8
10
2
IC102
BA3311L
6 7
9
NF
L-IN
R-IN
NF
L-OUT
ALC
R-OUT
Q151 Q152
L151
Q153
Q171 Q172 REC
SWITCHING
Q101-Q104
SWITCHING
1
IC101
IC101
HEAD SELECTOR
BA3126N
2
3
4
5
6
9
REC SW
P/B SW
CONT
P/B SW
REC SW
8
7
A-12V
L-CH
R-CH
R-CH
L-CH
L-CH
L-CH
A-GND
A-GND
A-GND
R-CH
R-CH
ERASE
CNP101
CNS101
CNS901
P.F
CAM SW
Q906
BIAS
REC
RUN_PLS SURROUND
MOT SOL U_CON 5V D-GND
A_12V TAPE SW
1
2
3
4
5
6
7
CNP901
PH901
PHOTE INTERRUPTER
SW901
FOOL
PROOF
SW902
CAM
1
CFW901
2
+
- 2
1
M
M901
TAPE MOTOR
SOLENOID
SOL901
TO DISPLAY PWB
Q904
Q902
A_12V
A_12V
SWITCHING
B-CAN(NC)
10 10
123456789
CNP703
M_GND
Q903
Q905
Q901
CF352 CF351
FM IF
24 22
21 20 19
18 17
16
15
14
13
12
11
10
9
8
7
6
5
4321
IC303
LA1832S
22
21
20 17
16
15
14
13
12
1 2 3 4 5 6 7 8 9 10
11
IC302
LC72131
X352
X351
456kHz
X IN NC CE DI CL
MO/ST
FM
FM
DO
CE DI CL DO
FM IN
X OUT
VSS
AOUT
VDD
AM IN
NC
IF IN
IF REQ
SW
VCC
AM TRACKING
AM OSC.
VD301-1
SVC348S
VD301-2
SVC348S
VR351
10K(B)
FM MUTE LEVEL
23
T351
+5V
AM IF
MUTE
R-MUTE
MO/ST
L-CH OUT
R-CH OUT
MPX VCO
AM LOW CUT
FM/AM OUT
MPX IN
AM OSC OUT
FM AFC
AM RF IN
VSM
AM OSC INAM MIX OUT
AM IF IN GND REG FM IF IN
SD
STEREO
FM DET
PHASE
(AM/FM)
IF OUT
PHASE
FM IF DET./FM MPX./AM IF
4.5MHz
Q351
SWITCHING
R_MUTE
PLL (TUNER)
ZD351
Q360
FM+B A_12V
3
1
VT
CF302
FM IF
AM OSC OUT
AM MIX OUT
A_GND
+5V A_12V
D_GND
REC BIAS
CONT
SWITCHING
SWITCHING
RUN PLS
SOL
M_12V
U_CON5V
MOT
SWITCHING
SWITCHING
SWITCHING
TAPE MOTOR
DRIVER
SOLENOID
DRIVER
BIAS OSC SWITCHING
AM IF IN
1
2
3
4
5
6
7
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
L-CH
R-CH
ERASE
HEAD
RECORD/
PLAYBACK
HEAD
T302
T306
1
2
3
IC102
REC./P.B.
EQUALIZER
AMP.
9
78654323211
VT
Q306
Q302
CF303T304
BF301
10.7MHz
IC301
FM FRONT END
TA7358AP
BAND
PASS
FILTER
L303
VD302
L302
VD303
FM RF
FM IF FM IF FM IF AMP.
FM OSC
VT TP301
1
2
AM/FM
ANTENNA
TERMINALS
CNP301
3
Figure 14 BLOCK DIAGRAM (1/4)

– 15 –
XL-55/55C
T
E
Q105
Q106 REC
STEREO
SD
CE
CD+B
P MUTE
P-STB
P-CONT
DI
CL
DO
FM ST
SD
123456
CD L
CNP605
TO CD SERVO PWB
SOL
U_CON 5V D-GND
A_12V TAPE SW
A_12V
PROTECT
REC L/R CH
TAPE L/R CH
L
AY PWB
TO DISPLAY
PWB
FROM DISPLAY
PWB
10 10
789
SO601
SPEAKER
TERMINALS
J601
HEADPHONES
13
IC601
LA4451
POWER
AMP.
IC681
KIA7805P
12 7
2
13
VCC
3
4
L-IN
R-IN
L-CH OUT
R-CH OUT
P-STB
MUTE
Q602
Q601
Q603A
Q605A
Q609A
VSS
VDD
IC401
LC75342M
IC461
KIA4558P
OPE AMP.
15 14 13 12 11 10 9
17 18 19 20 21 22 23 24 25 26 27 28 29
16
8 7 6 5 4 3
4321
5678
2 1
CE DI
30
CL
LOGIC
TUN L
TAPE L
CD L
AUX L
AUX R
TAPE R
TUN R
CD R
1
2
3
4
5
6
7
8
9
CNS704
SO401
VIDEO/AUX IN
SUB
WOOFER
OUT
R-MUTE
R
_MUTE
Q
360 A_12V
TO
DISPLAY
PWB
Q607
Q461Q463
Q605
Q604
Q606
Q608
Q603
Q683
Q609
VOLTAGE
REGULATOR CD+B
CD_6.2V
MECHA 12V
(M_12V)
AUDIO 12V
(A_12V)
A_12V
R-CH OUT
L-CHOUT A_12V
A_12V
USWD_5R6V
D_GND
A-GND
CD R D-GND
CD_6.2V
M_GND
L-CH
L-CH
+
+
3
2
1
GND
T.F
D651~D654
D656~D659
RLY681
D656~D659
VOLTAGE REGULATOR
SO651
AC POWER
INPUT SOCKET
AC120V,60Hz
CNP707
T651
POWER
TRANSFORMER
(MAIN)
T681
POWER
TRANSFORMER
(SUB)
F651
4.0A 125V
F652
1.6A 125V
9
2
5
11
CNP652
1
2
CNP652
1
2
GND
GND
CNS652
1
2
REC R CH
REC L CH
NC
FUNCTION/VOLUME EQUALIZER
SURROUND
Figure 15 BLOCK DIAGRAM (2/4)

XL-55/55C
– 16 –
Figure 16 BLOCK DIAGRAM (3/4)
CNP702
CNS605
CNP605
CLID SW
GVSW
PICK_IN
BLKCK
MDATA
MCLK
MLD
MRST
CD STB
STAT
TO MAIN SECTION
TO MAIN SECTION
TO MAIN SECTION
TO AMP. SECTION
D701~709
LED
SW700
VOLUME
C
C
D
A
C
M
M
_
6
5
4
3
3
2
5
6
4
1
2
1
7
8
9
10
1
4
514 38
100 67
Q707
Q701 Q702
Q703
Q706
M_
G
SW801
CD LID
OPEN/CLOSE
~ ~
~39 42 ~
SEG0
SEG33
COM0
COM3
65
65
64
63
62
61
60
59
58
33
50
49
26
27
28
25
46
45
44
43
22 222930313435363938 5142 47 41
MRST
MCLK
STAT
BLBCK
MDATA
MLD
PU_IN
CD_STB
21
15
14
11
5 VLC3
8VDD
MMOD
VREF
USWD_5.6V
VSS
13
12
10
9
18
17 KEY1
KEY2
SW702-SW704
SW701
SW707-SW709
SW705,SW706
KEY
POWER
37 9
8
7
6
5
4
3
2
1
1
2
SD
STEREO
DO
CL
CE
DI
CD+B
P_MUTE
P_STB
SURROUND
SD
STEREO
CL
DO
DI
CE
P_MUTE
P_STB
CD+B
SURR
10
11
9
8
7
6
5
4
3
2
1
TAPE_SW
D_GND
D_GND
SOL
MOT
REC
RUN_PLS
BIAS
B_CAN
A–12V
A–12V
PROTECT
U_CON5V
TAPE_SW SOL
MOT REC
RUN_PLS BIAS
B-CAN
CLID_SW
GVSW
BACK_LIGHT
SWITCHING
JOG_UP P_CONT JOG_DOWN
REMOCON
SYS_STOP
SYS_STOP
1 2 3
REMOTE
SENSOR
GP1U281X
RX701
3
1
2
24
7
6
VLC1
VLC2
VREF+
IX0060SJ
SYSTEM CONTROL
MICROCOMPUTER
8MHz
32.768MHz
IC701
LCD701
X701
X702
CNS704
CNS680
CNP704
CNP703
CNP680
CNS703
CNS707
TO POWER

– 17 –
XL-55/55C
Figure 17 BLOCK DIAGRAM (4/4)
CNP702
CNS605
CNP605
CLID SW
GVSW
PICK_IN
BLKCK
MDATA
MCLK
MLD
MRST
CD STB
STAT
NM801
SLED
MOTOR
NM802
SPINDLE
MOTOR
MM
TRACKING COIL
FOCUS COIL
PICKUP UNIT
VCC
GND
MON
LD
1/2V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
TO MAIN SECTION
TO MAIN SECTION
TO MAIN SECTION
TO AMP. SECTION
CD_R
CD_L
D_GND
D_GND
D_GND
D_GND
A_GND
CD_6.2V
CD_6.2V
+6.2V
+6.2V
M_GND
M_GND
M_GND
M_GND
6
5
4
3
3
2
5
6
4
1
3
2
1
2
1
7
8
9
10
Q801
Q804
LASER
DRIVER
CONSTANT
VOLTAGE
SW800
PICKUP IN
M_GND
SW801
CD LID
OPEN/CLOSE
80 79 78 77 76 75 74 73 72 71 70
40
39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 22 21
44 45 50 51 57 58 59 60
13 9 8 7
6
4
18 17 16 14
SSEL
MSEL
PSEL
CSEL RSEL
OUTR
AVSS1
OUTL
AVDD1
/TEST
IOSEL
VDD
J801
DIGITAL
OUT
X2
X1
VSS
AVSS2
AVDD2
IREF
ARF
TBAL LD BDO /RFDET TRCRS OFT VDET RFENV TE FE FBAL VREF FOO TRO KICK ECS ECM TVD TVR
/RST
STAT
DMUTE
SQCK
BLKCK
MLD
MDATA
MCLK
TX
DVDD1
5
DVSS1
32
31
30
29
28
27
26
25
24
23
1
2
3
4
5
6
7
8
9
10
16
15
14
13
12
11
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
17
16
18
19
20
21
22
23
24
25
26
27
28
PO1–
PO1+
VO3–
VO3+
VIN3
VG3
VCC
VCC
BIAS
VG4
VIN4
VO4+
VO4–
OPO
VO2–
VO2+
VIN2
VG2
GND
GND
GND
MUTE
REG O
TRB
VG1
VIN1
VO1+
VO1–
VREF
VDET
TEBPF
TEOUT
TEN
FEN
FEOUT
GCTL
FBAL
TBAL
E
E
F
F
D
B
B
C
C
A
A
GND
NRFDET
OFTR
CBDO
CDFTR
BDO
3TOUT
CEA
ARF
CACC
RFIN
RFOUT
RFN
VCC
LD
PD
9
8
7
6
5
4
3
2
1
1
2
D
O
O
C
L
E
D
I
B
T
E
T
B
10
11
9
8
7
6
5
4
3
2
1
MN6627482W
SERVO/SIGNALCONTROL
AN22000A
HEAD AMP.
MM1469XH
FOCUS/TRACKING/
SPIN/SLED DRIVER
16.93MHz
IC801
IC802
IC804
X803
CNS704
CNS680
CNP704
CNP703
CNP680
CNS703

XL-55/55C
– 18 –
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 13.
(0V)
4.7V
1.3V
1.3V
4V
(2.2V)
2.3V
2.1V
(0V)
5V
2.1V
2.1V2.1V
0V
5V 5V
(4.3V)
2.9V
0V 5V
(1.2V)
3.8V
(1.9V)
3.8V
5V
2.5V
(2.7V)
2.1V
(2.7V)2.1V
0.6V
(0.9V)0V
2.3V
5.2V (0V) 2.6V
(2.6V)
0V
0.9V 0.9V
2.6V2.6V
0V
5.1V 4.8V 0.1V 0.1V
3.9V
(0V)
(0V)
3.5V
3.7V
(11.4V)
1.7V
0V
(10V)
(8.3V)
8V
0.3V
0V
0V
0V
0V
0V
0V
0V
(11.7V)
11.7V
(0V)
0V
(0V)
2.6V
(0V)
7.8V
8.3V
(0V)
4.7V
(0V)
1.5V
0.3V 0.3V
(0.8V) (0.8V)
(0.8V)
(0.8V)
0.3V
0.3V
(0V)
1.5V
10.1V
4.6V
4.6V
0V
0V
0V
0V 0V
0.6V 0.6V
10.2V
0.7V
10.9V
10.8V
11.7V
0.7V
11.7V
11.7V
0V
4.4V
0.6V
4.9V
4.9V
11.8V
11.7V
11.9V
11.8V
3.2V
0.7V 0V
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
10
9
8
5
2
(ML)
9
8
7
6
5
4
3
2
1
1K
7
6
5
4
3
2
1
3 4 1
11 6
7
12
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10
11 12
22 21 20 19 18 17 16 15 14 13 12
1 2 3 4 5 6 7 8 9
10 11
11 2 3 2 3 4 5 6 7 8 9
10
987654321
3
CHASSIS
GND FM/AM
ANTENNA
2
1
BIAS
SURROUND
D_GND U_CON5V
SOL
MOT REC
RUN_PLS
A-12V
C
PD
9P(UJ)
FM FRONT END
(CH)
(UJ)
R-CH
L-CH
TAPE MECHANISM PWB-D,E(217-10,11)
TAPE MECHANISM
Ass'y (217)
ERASE
HEAD
HEAD
RECORD/PLAYBACK
SOLENOID
TAPE
MOTOR
–
+
FOOL PROOF
CAM PHOTO
INTERRUPTER
M 12V
VT
FM FM MUTE
TAPE R
TAPE L
REC R
REC L
VSM
AM RF
(AM/FM) PHASE
PHASE IF OUT VCC FM DET STEREO SD GND AM IF
REG
AM MIX OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
CUT
AM LOW
FM/AM
MPX VCO
MPX IN
MO/ST
L-CH
R-CH
FM IF
FM AFC
AM OSC AM OSC
CE DI CL DO MO/ST IF REQ
IF IN
AM IN
FM IN
VDD
AIN
AOUT
VSS
X OUT
X IN
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
7
6
1
2
3
4
5
7
6
M
1
2
1
2 1
11
1
1
12
2
2
2
2
2
3
3
3
1
23
3
3
3
3
1
2
AM ANT
AM OSC
FM OSC
AM TRACKING FM MUTE LEVEL
P21 12 - E
CNS703
FROM DISPLAY PWB
AM BAND COVERAGE fL
FM BAND
COVERAGE fL
FM IF
FM IF
FM IF
FM IF
AM IF
1
2
3
1
TP301
2
31
2
3
FM RF
0.001
0.001
0.001
68K
27P
560P
0.022
0.022
1N4148
1N4148
0.047
0.022
12P
SVC348S
1mH
8.2K
33P
0.022
3.3/50
0.022
0.022
0.001
4.7/25
0.022
2.7K
1/50
456kHz
1/50
1/50
12K
1/50 1K 470K 12K
56P
KRC104 M
0.022
0.022
6.8K
6.8K
LA1832S
FMIFDET./FMMPX./AMIF
2.2/50
3.3K
1/50
0.001
1/50
22P(CH)
10K
100/10
270
0.022
0.022
0.022
330P
33P
10/16
0.022
2.2K
5.6K
10K
0.001
1N4148
1N4148
0.001
33K
KDV147B
100K
1N4148
1N4148
0.022
0.01
0.001
0.0047
0.0047
18P(CH)
0.001
5P
22
TA7358AP
10P(CH)
47K
100P
33
SC1674-C
10/16
0.0033
0.022
680
6P(UJ)
KDV147B
10K
22P(CH)
33P
33
470
47
4.7K
330
2.2K
680
SC1674-C
33
0.022
330
330
0.022
47/16
10K
1/50
1.5K
0.001
10/16
0.022
100µH
330P
0.01
2.2K
5.6K
1K
15P(CH)
0.001
4.5MHz
1K 1K 1K 1K
1.8K
4.7K
LC72131
PLL(TUNER)
12P(CH)
BA3126N
HEAD SELECTOR
82P
1K
0.001
330
10K
0.001
2.7K
82P
820P
KRC102 M
KRA102 M
2HA1015 GR
C2001-K
330µH
150
150
10K
10K
KRC104 M
100/16
0.0039
47K
56
0.027
100K
15K
2HC1815 GR 2HC1815 GR 22K
15K
4.7/25
0.0022
4.7K
100
4.7K
5.6K
4.7/25
2HC1815 GR 2HC1815 GR
4.7/25
22K
100
0.0022
4.7K
100K
10/16
4.7K
4.7/25
BA3311L
REC./P.B.
EQUALIZER
AMP.
150K
3.9K
10K
47/16
120
0.015 10/16
330P
330P 270P
0.015
150K
270P
10K
120
10/16
3.9K
47/16
330
2.2/50
2.2K
1K
4.7K
3.3K
22/16
100K
2HC1815 GR
100/25
10K
100µH
0.022
100/10
DZ5.1BSB
390
390
2HA1015 GR
5.6K
6.8K
5.6K
47/16
3.3K
2.2K
1N4148
2HC1815 GR 4.7K
33K
18K
HSB562-C
0.001
56K
1N4148
HSB562-C
1N4148
100/25
3.3/50
10K
47K
270 KRC107 M
1.5K
10K
1.5K
0.022
KRC102 M
KRC102 M
0.022
1N4148
KRA102 M
1N4148
0.022
1K
47K
0.022
5.6K
CNP301
C376
C301
C302
T306
R323
C334
C335
C337
C329
D301
D302
T302
C331
C332
C330
VD301
VR351
L353
R358
C343
C361
C362
C360
C363
C366
C364
C365
X351
R350
C367
C372
C371R361
C368 R356 R357
R362
C369
C374
C373
Q351
R363
R364
IC303
C357
R355
C358
C356
C370
C355
R376
C398
R353
C354
CF351
C399
C353
CF352
T351
C378
CF302
C344
C352
C351
R366
R351
R336
C349
D307
D305
C320
R303
VD303
R302
L302
C306
D306
D308
C308
C304
C309
C305
C307
C319
C303
C318
R301
BF301 IC301
C311
T304
R304
C315
R315
Q302
C316
C321
C317
R305
CF303
C313
L303
VD302
R308
C314
C312
R306
R307
R310
R309
R316
R312
R313
Q306
R314
C323
R382
R386
C397
C394
R381
C393
R380
C392
C380
C387
L351
C386
C385
R379
R377
R393
C382
C384
R374 R373 R372 R371
R359
R360
IC302
X352
C381
CNW101
CNP101
IC101
C122
R102
C102
R138
R140
C101
R139
C121
R101
C131
Q172
Q171
Q152
Q151
L151
R156
R157
R155
R153
R154
Q153
C155
C153
R151
C154
R152
R116
Q101 Q103 R117
R115
C129
C115
R123
R119
R121
R126
C113
Q102 Q104 C130
R118
R120
C116
R124
R125
C117
R122
C114
IC102
R105
R109
R107
C107
R103
C109 C111
C103
C104 C105
C110
R106
C106
R108
R104
C112
R110
C108
R141
C123
R111
R133
R131
R113
C126
R134
Q105
C125
R365
L352
C395
C396
ZD351
R391
R392
Q360
R385
R384
R383
C391
R114
R112
D104
Q106 R132
CNW901 CNS901
R910
R909
Q902
C901
R902
D901
Q905
D902
C903
C902
R907
R903
R904 Q903
R901
R905
R906
C905
Q901
Q904
C904
D904
Q906
D903
SW901(217-7)
SW902(217-8)
M901(217-9)
SOL901(217-4)
C350
R352
R395
C383
R387
Figure 18 SCHEMATIC DIAGRAM (1/7)

– 19 –
XL-55/55C
78 9 10 11 12
4.8V 4.8V 4.8V
4.8V
9.6V
5V
4.8V
4.8V 4.8V 4.8V 4.8V 4.8V
4.8V 4.8V 4.8V
4.8V 4.8V 4.8V 4.8V 4.8V 4.8V
0V 0V 0V 0V
13V
20V
12.3V
11.7V 20V
20V
11.7V
4.5V
0V
7.8V
7.5V
20V6.2V
0V
+B +B
+B+B
+B+B
+B
+B
+B
+B
+B +B
+B 13
12
11
10
9
8
7
6
5
4
3
2
1
8
7
6
5
4 3 2 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
16
17
18
19
20
21
22
23
24
25
26
27
28 29 30
9
8
7
6
5
4
3
2
1
10 11
98
7
1 2 3 4 5 6
2
1
5 5
1 1
SURROUND
CL DO
TAPE_SW
A_GND
STEREO
DI CE
D_GND U_CON5V
CD_L CD_R
A-12V
M-GND CD-6.2V D-GND
CD TEST POINT
CL VDD VREF
ROUT RBS2 RBS1 RTRE RIN RSL0
R4 R3 R2 R1 L1
L2 L3 L4
LSL0
LIN
LTRE
LBS1 LBS2
LOUT
TEST
VSS
CE
DI
CE
DI
CL
VIDEO/AUX IN
SUB
WOOFER
OUT
L-CH
R-CH
R
L
R
L
AUX R
TAPE R
TUN R
CD R
AUX L
TAPE L
TUN L
CD L
P MUTE
P-STB
CD+B
FM ST
SD
DI
CE
DO
CL
MAIN PWB-A1
SPEAKER BOX
SPEAKER BOX
HEADPHONES PWB-A5
TWEETER
TWEETER
WOOFER
WOOFER
SPEAKER TERMINAL
4 Ohm
+
+
–
–4 Ohm
R-CH
R-CH
L-CH
L-CH
10
9
5
4
3
2
1
HEADPONES
2
1
CHASSIS
GND
1
2
2
3
3
1
P21 12 - F
CNS704
TO DISPLAY PWB
PWB P23 12 - D
CNS605
FROM CD SERVO PWB
P24 2 - E
CNP652
TO POWER PWB
P24 2 - C
CNS604
FROM POWER AMP. PWB
LCH_OUT
LCH_OUT
LCH_GND
LCH_GND
RCH_GND
RCH_GND
RCH_OUT
RCH_OUT
P_MUTE
P_STB
RCH_IN
A_GND
LCH_IN
1
2
3
S
DG
IC461
27K
1K
27K
1.5K1.5K
330P
0.001
0.001
330P
10/16
10/16
10/16
10/16
1K
1K
1K
33/16
3.9K
1N4004
100/16
10/16
0.1
0.1
0.0027
1N4004
1N4004
6.8K
2.2/50
10/16
1K
1K
1K
1K
10/16
10/16
10/16
10/16
LC75342M
FUNCTION/ VOLUME EQUALIZER
3.9K
0.1
0.1
10/16
0.0027
2.2/50 6.8K
10/16
1K
1K
1K 1K
3.3K
0.47/50
27K
27K
1K
820P
10µH
330
330
470/25
1K
DZ130BSA
100
2HC1815 GR
47
22K
0.022
1N4148
100/25
1N4148
33K
KTC2026 Y
22K
0.022
10/16
KTC2026 Y
47
0.022
10K
KTC2026 Y
47/16
DZ7.5BSC
1K
KRC107 M
KRA102 M
10K
2HC1815 GR
1N4148
4700/25
47K 2SK2541
1N4148
KIA4558P
OPE AMP.
0.0033
0.0033
1/50 8.2K
0.0056 0.0056
47/16
1/50 8.2K
10K
4.7/50
12K
2.7K
100K
1/50 12K
100/16
12K
10K
10K
1/50
10K 2.7K
4.7/50
12K
12K
100K
12K
KRC107 M
330
120
120
CNP704 SO401 R406
R410
R405
R408
R407
C411
C340
C413
C412
C402
C404
C406
C408
R425
R424
R423
C429
R439
D403
C430
C425
C423
C421
C419
D401
D402
R437
C417
C415
R421
R417
R415
R419
C407
C405
C403
C401
IC401
R440
C424
C422
C426
C420
C418 R438
C416
R418
R416
R420
R422
R634
C414
R413
R412
R411
SO601
CFW601
CFW601A
C663
L603
R662
R661
J601
CNW652
CNS652
C620
R629
ZD601
R628
Q603
R620
R621
C622
D603
C621
D602
R617
Q605
R623
C624
C625
Q604R619
CNP605
C627
R627
Q607
C626
ZD602
R624
Q609
Q608
R625
Q606
D604
CNP703
C616
R467 Q461
D461
IC461
C471
C463 R461
C461
C469 C468
C473
R463R473
R471
R465
C475
R475
R470
R469
C472 C464
C476
C462
R468
R478
R462
R464
R474
R472
R466
C474
R477
R476
J920
J923
Q463
CNP604
FM SIGNAL
AUX SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
CD SIGNAL
AM SIGNAL
Figure 19 SCHEMATIC DIAGRAM (2/7)

XL-55/55C
– 20 –
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 13.
0V
5V 5V 0V 0V
5V
5V 5V 5V 0V 0V 0V
2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V
0.6V
5V
5V
1.7V
3.3V
2.6V
2.6V
2.4V
1.9V
5V
5V
5V
5V
0V
0V
0V
0V
2.5V
2.5V
2.5V
2.5V
+B+B
+B USWD_5.6V
+B
+B +B
+B
+B
+B
+B
+B
+B
P24 2 - F
CNP707 TO POWER PWB
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1 2 3
REMOTE
SENSOR
26 27 28 29 30 31 32 33 34 35 36 37 3
8
99 98 97 96 95 94 93 92 91 90 89 8
8
100
JOG_UP
JOG_DOWN
GVSW
PRESET DOWN
PRESET UP
CD PAUSE
PLAY/
TUNING UP
FF>>
FUNCTION
VDD
VLC1
VLC2
VLC3
COM0
COM1
COM2
COM3
SEG0
SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9
SEG10 SEG11
SEG12
PAUSE
STAND-BY
POWER ON/
TREBLE
BASS/
TUNING DOWN
STOP/
MEMORY/
CLEAR
SET
REC/
OSC1
MMOD
VREF+
TAPE_SW
OSC2
CLID_SW
DI
KEY1
MOT
REC
VSM
MODEL
KEY2
VREF
XO
XI
VSS
RESET
CL DO CE
B-CAN BIAS RUN_PLS
SOL
SYS STOP
POWER
C
VOLUME
A
B
<<REW
2
2
1
1
3
1
3
22
1
1
7
16151413121110
987654321
LED PWB-A4
1
3
2
MPG3372X
MPG3372X
MPG3372X
82
82
82
MPG3372X
MPG3372X
MPG3372X
82
82
82
MPG3372X
MPG3372X
MPG3372X
82
82
82
3.9K
4.7K
3.9K
5.6K
10K
1.2K
47K
47K
47K
100µH
10K 0.022
8MHz
32.768MHz
1K
12K 1K
1K
1K
1K
22P (CH)
22P(CH)
10K
10K
10K
1K 1K 1K 1K 1K 1K 1K 1K 1K 1K 1K 1K
1K
1K 1K
IX00
6
SYSTEM
C
MICROC
O
33K
33K
47K
47K
47K
47K
0.022
100/10
100
GP1U281X
1K 560P 10/16
ZD3.3BSB
KRC102 M
1K
0.01 1N4148
1K
3.3K
1N4148
100K 3.3/50
1N4148 1N4148
120
10K
0.01
10K
2HC1815 GR
82
2HC1815 GR
1K
KRC102 M
2.2K
47K
2HA1015 GR
0.001
0.001
CFW701A
D706
D703
D709
R7D9
R7E1
R7D3 D708
D705
D702
R7D5
R7D1
R7D2
D704
D701
D707
R7D6
R7D4
R7D8
SW709
SW704
SW703
SW702
SW707
SW708
R705
R706
R710
R709
R708
SW705
SW706 R707
R727
R729
R723
L701
SW701 R702 C703
X701
R728
X702
R724 R731
R732
R733
R734
C702
C701
R722
R721
R725
R745
R737
R738 R739 R740 R741 R775 R743 R746 R744 R748 R747
R749 R750
IC7
0
R783
R782
R781
R780
R779
R778
C704
C715
R7A3
RX701
R7A1 C714 C713
Q701
R7A7
C710
D720
R7A6
R7A9
D721
R7A2
C711
D722 D723
ZD701
R7A4
R7A5
C712
R7B0
Q703
R7A8
Q702
R7A0
Q706
R793
R792
Q707
CNW707 CNS707
SW700
CFW701
R756
C705
C706
Figure 20 SCHEMATIC DIAGRAM (3/7)