Sony XL55 Service Manual

XL-55/55C

SERVICE MANUAL

No. S1308XL55////

MICRO COMPONENT SYSTEM

Illustration XL-55

MODEL

XL- 55 Micro Component System consisting of XL- 55 (main unit)
and CP- XL55 (speaker system).

MODEL

XL- 55C Micro Component System consisting of XL- 55C (main
unit) and CP- XL55 (speaker system).

• 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.

XL-55

XL-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)

SHARP CORPORATION

– 1 –

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

XL-55/55C

TO EXPOSED
METAL PARTS

CONNECT TO
KNOWN EARTH
GROUND

TEST PROBE

0.15 µ F

1.5k ohms
10W

VTVM

AC SCALE

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
or that hardware is not lodged between the chassis 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 having

a return path to the chassis (antenna, metal cabinet, screw heads,
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.

■ General

■ Amplifier (Except for Canada)

■ Amplifier (For Canada)

■ Tuner

Power source
Power

consumption
Dimensions

Weight

Output power

Output terminals

Input terminals

Output power
Output terminals

Input terminals

Frequency range

SPECIFICATIONS

AC 120 V, 60 Hz
48 W

Width: 6-5/16" (160 mm)
Height: 9-1/2" (240 mm)
Depth: 11-11/16" (296 mm)

7.9 lbs. (3.6 kg)

20 watts minimum RMS per channel into 4
ohms from 100 Hz to 20 kHz, 10% total har­monic distortion

Speakers: 4 ohms
Headphones: 16 - 50 ohms (recommended:

32 ohms)
CD digital output (optical)
Subwoofer (Audio signal): 500 mV/47 k

ohms
Video/Auxiliary (audio signal): 500 mV/47 k

ohms

RMS: 40 W (20 W + 20 W) (10 % T.H.D.)
Speakers: 4 ohms
Headphones: 16 - 50 ohms (recommended:

32 ohms)
CD digital output (optical)
Subwoofer (Audio signal): 500 mV/47 k

ohms
Video/Auxiliary (audio signal): 500 mV/47 k

ohms

FM: 87.5 - 108 MHz
AM: 530 - 1,720 kHz

■ CD player

Type
Signal readout

D/A converter
Frequency

response
Dynamic range

Compact disc player
Non-contact, 3-beam semiconductor laser

pickup
1-bit D/A converter
20 - 20,000 Hz

90 dB (1 kHz)

■ Cassette deck

Frequency
response

Signal/noise ratio
Wow and flutter

50 - 14,000 Hz (normal tape)

50 dB (recording/playback)

0.25 % (WRMS)

■ Speaker

Type

Maximum input
power

Rated input power
Impedance
Dimensions

Weight

2-way type speaker system
Tweeter
4" (10 cm) Woofer
40 W

20 W
4 ohms
Width: 6-5/16" (160 mm)

Height: 9-1/2" (240 mm)
Depth: 7-7/8" (200 mm)

4.7 lbs. (2.1 kg)/each

Specifications for this model are subject to change without
prior notice.

– 2 –

NAMES OF PARTS

XL-55/55C

610789

11 12 13 14

5

15

16

17 18 19

23
24

25

26

27
28
29

30

20

21
22

1
2

3
4

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/Auxil iary (Audio Signal) Input Jacks

29.Subwoofer Output Jack

30.Speaker Terminals

1

3

2

4
5

6
7
8

9
10
11
12
13
14

15

18
19

20
21
22
23
24

25
26

27

16
17

Buttons with " " mark in the illustration can be operated on the re­mote control only.

28

1.Tweeter

2.Woofer

3.Speaker Wire

Speaker grilles are removable:

Make sure nothing comes into contact with the
speaker diaphragms when you remove the
speaker grilles.

Remote Control Transmitter

4.

5.Clock Button

Power On/Stand-by Button

6.

CD Button

7.

Tuner and Band Selector Button

8.

9.Clear Button

Memory Button

10.

CD Track Down, Tuner Preset Down Button

11.

CD Fast Reverse, Tuning Down,

12.

Tape Rewind Button
CD or Tape Play Button

13.

14.Surround Button

CD or Tape Stop Button

15.

Volume Up and Down Buttons

16.

Bass Up and Down Buttons

17.

18.Timer Button

19.Sleep Button

Video/Auxiliary Button

20.

Tape Button

21.

22.Repeat Button

23.Random Button

CD Track Up, Tuner Preset Up Button

24.

CD Fast Forward, Tuning Up,

25.

Tape Fast Forward Button
Tape Record Pause Button

26.

CD Pause Button

27.

Treble Up and Down Buttons

28.

– 3 –

XL-55/55C

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

DISASSEMBLY

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 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.

Main PWB

(D1)x1
ø3x10mm

(D3)x1

(D2)x1

(C2)x2
ø3x10mm

Rear Panel

Power Amp. PWB

Power PWB

STEP

1 Top Cabinet 1. Screw .................. (A1) x5 4-1

2 Side Panel

3 Rear Panel 1. Screw .................. (C1) x2 4-1

4 Power Amp. PWB 1. Screw .................. (D1) x1 4-2

5 Main PWB/ 1. Screw .................. (E1) x4 4-3

6 Front Panel 1. Screw .................. (F1) x2 4-4

7 Power PWB 1. Screw .................. (G1) x2 4-4

8 Tape Mechanism 1. Screw .................. (H1) x4 4-5

9 Display PWB 1. Knob .................... (J1) x1 4-5

10 CD PWB(Note)/ 1. Screw .................. (K1) x4 5-1

11 CD Mechanism 1. Screw .................. (L1) x3 5-2

Note:

After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the front end
of the connector so as to protect the optical pickup from electro­static damage.

REMOVAL PROCEDURE FIGURE

2. Socket ................. (A2) x2 4-1,3

(Left/Right)

Headphones PWB 2. Socket ................. (E2) x4

Open Close Switch PWB

Jack PWB 3. Socket ................. (K3) x3

1. Screw .................. (B1) x4 4-1

2. Screw .................. (C2) x2 4-2

2. Socket ................. (D2) x1

3. Socket ................. (D3) x1

3. Socket ................. (E3) x1

2. Socket ................. (F2) x2

2. Shield Cover ....... (G2) x1

3. Screw .................. (G3) x5

2. Screw .................. (J2) x8

2. Screw .................. (K2) x2

Tape
Mechanism
PWB

(E2)x2

(A2)x1

(E2)x2

Power PWB

Figure 4-2

(E3)x1

(E1)x1
ø3x10mm

Headphones
PWB

(E1)x1
ø3x10mm

Main PWB

(E1)x1
ø3x10mm

(E1)x1
ø3x10mm

Figure 4-3

(A1)x1
ø3x10mm

Side Panel
(Right)

CD PWB

(B1)x2
ø3x10mm

Top Cabinet

Rear Panel

(A1)x1
ø3x10mm

Figure 4-1

(A2)x1

(B1)x2
ø3x10mm

(C1)x1
ø3x10mm

(A1)x1
ø3x10mm

(A1)x2
ø3x10mm

(C1)x1
ø3x10mm

Side Panel
(Lift)

– 4 –

(J1)x1

Open

Cassette
Holder

Figure 4-4

Front Panel

Figure 4-5

Display PWB

(J2)x8
ø2.6x10mm

Tape
Mechanism

(H1)x4
ø2.6x10mm

<A>

Pinch Roller
(B1)x1

Pinch Roller
Pawl

Main Belt
(C1)x1

FF/REW Belt
(C2)x1

REW/FF
Clutch

Motor

(K2)x1

(L1)x3
ø2.6x10mm

Top Cabinet

CD Mechanism

ø2.6x10mm

Top Cabinet

CD PWB

(K1)x4
ø2.4x10mm

(K2)x1
ø2.6x10mm

Open/Close
Switch PWB

(K3)x1

XL-55/55C

(K3)x2

Jack
PWB

CD Mechanism

Figure 5-1

REMOVING AND REINSTALLING THE MAIN PARTS

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

<A>, and remove the pinch roller (B1) x 1 pc.,

arrow
upwards.

(A2)x1
ø2x7mm

(A1)x2
ø2x8mm

Erase Head

Record/
Playback Head

Figure 5-2

(A2)x1
ø2x3mm

Figure 5-3

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:

When putting on the belt, ascertain that the belt is not twisted,
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:

When mounting the motor, pay attention to the motor mounting
angle.

– 5 –

(D1)x1
ø2x4mm

Motor

(D1)x1
ø2x4mm

Figure 5-4

Figure 5-5

(D2)x3
Special
Screw

Motor
Bracket

Motor

Figure 5-6

XL-55/55C

Pickup Unit

(A2) x2
ø2.6 x6mm

(A1) x2

CD Mechanism

Shaft
(A3) x1

Gear
(A5) x1

StopWasher
(A4) x1

Mechanism Cover

(A1) x2

Stop
Washer

Driver

(E1)x1
Stop Washer

Mechanism
Chassis

Washerx2

Flywheel

How to remove the flywheel (See Fig. 6-1.)

1. Remove the belt.

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

Install each part in the reverse order of the removal with care.

Figure 6-1

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.

CD MECHANISM SECTION

Perform steps 1, 10 and 11 of the disassembly method to
remove the CD mechanism. (See page 4.)

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.

(F1)x1
ø2x3mm

Tape
Mechanism
PWB

(F2)x1
ø2x8mm

Tape
Mechanism
PWB

(F3)x2
Solder
Joint

Figure 6-2

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 6-3

– 6 –

MECHANISM SECTION

• Driving Force Check

Torque Meter

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

• Tape Speed

Test Tape

MTT-111 Variable 3,000 ± Headphone

Adjusting

Point

resistor in 90 Hz terminal
motor.(M901)

TAPE MECHANISM

Specified Value

Specified Value

Specified

Value

Instrument

Connection

ADJUSTMENT

• FM Mute Level

Signal generator: 1 kHz, 40 kHz dev., FM modulated

Frequency

98.00 MHz 98.00 MHz VR351*1 Input: CNP301
(30 dBµV) Output: Speaker

*1. Adjust so that an output signal appears.

• FM Detection

Signal generator: 10.7 MHz, FM sweep generator

Test

Stage

FM IF 10.7 MHz 98.00 MHz T304(Turn Input: Pin 1 of

Display

Frequency Frequency

Display

Adjusting

Parts

Terminal

Setting/

Adjusting

Parts

the core of IC301
T304 fully
counter­clockwise).

XL-55/55C

Instrument

Connection

Instrument

Connection

M901
Tape
Motor

Variable
resistor
in motor

Figure 7-1 ADJUSTMENT POINT

TUNER SECTION

fL: Low-renge frequency
fH: High-renge frequency

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage

Frequency Frequency

Display

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

*1. Input: Antenna Output: Speaker terminal
*2. Input: Input is not connected Output: TP301

• Check FM VT

Signal generator: 1 kHz, 40 kHz dev., FM modulated

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

Display

Check Point

Setting/

Adjusting

Parts

Instrument

Connection

Instrument

Connection

• FM RF

Signal generator: 1 kHz, 75 kHz dev., FM modulated

Test Stage

FM Band — 87.50 MHz (fL): L303 *1
Coverage 3.4 ± 0.1 V

FM RF 98.00 MHz 98.00 MHz L302 *2

Frequency Frequency

Display

(10~30 dB)

Setting/

Adjusting

Parts

Instrument

Connection

*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal

MAIN PWB

IC302

TP301

R336

T306

FM Band
Coverage fL

FM IF

L302

FM OSC.

L303

T304

FM RF

T302

9

IC301

1

AM
Tracking

BF301

IC303

AM IF

T351

CF352

AM Band
Coverage fL

AM OSC.

FM Mute
Level

VR351

Figure 7-2 ADJUSTMENT POINTS

CNP301
ANTENNA
SOCKET

– 7 –

XL-55/55C

• 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

1 87.50 MHz
2 108.00 MHz
3 98.00 MHz
4 90.00 MHz
5 106.00 MHz
11~25 ––––

Preset No.

6 531 kHz
7 1,602 kHz
8 990 kHz
9 603 kHz
10 1,404 kHz

AM

Preset No.

26 106.00 MHz
27 90.00 MHz
28 98.00 MHz
29 108.00 MHz
30 87.50 MHz

FM MONO

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
ordinary stand-by mode (power off state). In this case only the main unit button is valid. Even when the POWER of remote control
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
[Self-diagnosis Test Mode]

1. Button input diagnosis test mode (TEST6).…

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
termination of test mode by pressing the POWER ON/STAND-BY button or return to the step 1 by pressing the STOP button are inhibited.

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.

MEMORY/SET + PLAY

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

– 8 –

XL-55/55C

* In case of initialization the pickup is moved toward the inner periphery. Any buttons other than POWER ON/STAND-BY button

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.

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.

If the following buttons are pressed in this state, the operation is performed as follows.
"

POWER ON/STAND-BY

"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.

"REW/REV" .............The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

"PLAY".....................Shift to step 3

"STOP" ....................Return to step 1

"REC PAUSE" .........Shift to step 5

" ..The test mode is turned off, the power is turned off, and the ordinary stand-by mode is set.

is invalid.

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.

When the following operation buttons are pressed in this state, the operation is executed as follows.

POWER ON/STAND-BY

"

"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.

"REW/REV" .............The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

"PLAY".....................If the focus has been set, shift to step 4 is executed. If the focus has not been set, acceptance is inhibited.

"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.

4. Step 4 Mode (Only focus "OK" can make this item showing)

The CLV servo ON command (8600) sending operation is performed, and the next button input is waited. (The disc is rotated
to perform CLV locking.)

" ..The test mode is turned off, the power is turned off, and the ordinary standby mode is set.

is invalid.

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

"FF/FWD" ................The pickup slides toward the outer periphery while this button is held down.

"REW/REV" .............The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

"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.

" ..The test mode is turned off, the power is turned off, and the ordinary standby mode is set.

is invalid.

– 9 –

XL-55/55C

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.

When the following operation buttons are pressed in this sate, the operation is executed as follows.

POWER ON/STAND-BY

"

"FF/FWD".................The pickup slides toward the outer periphery while this button is held down.

"REW/REV"..............The pickup slides toward the inner periphery while this button is held down. However, if PU-IN is on, input

"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.

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.

"...The test mode is turned off, the power is turned off, and the ordinary standby mode is set.

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

written in the memory to be checked in case of memory check (in case of initial setting) so that memory abnormality is detected

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.

•

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.

->

POWER OFF

->

IF AC is set to OFF in the TEST2

mode, the initial state is restored.

– 10 –

3. Preset frequencies for various destinations (random preset memory)

XL-55/55C

CH

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

• 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(3) BASS/TREBLE is switched when button operation is performed.

BAND

∞ (STEP 0) <-> Volume-14 dB (STEP 23) <-> Volume-0 (STEP 30)

Europe 2, 4

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

CH

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

BAND

Europe 2, 4

5. Timer test Mode (TEST 4)

When the test mode is set, the following indication lights for one second.

The current time and timer time are set in the following procedure to perform the timer playback.

1.Set the current time to 1:00, set the timer to ON time 1:05, set the function to Aux, and set volume STEP 12. One minute is counted
as one second, and the timer playback operation is performed. 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 changed to the standby mode.

The indication during operation is the same as that of ordinary timer operation.

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

– 11 –

XL-55/55C

7. Key input diagnosis Test Mode (TEST 6)

When the test mode is set, the following indication appears.

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.

ERROR LIST

PU-IN SW detection error

Tape mechanism error 1

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 .......................Solve the problem and turn on the power

again.

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....... The disc is loaded upside down, not CD-

DA, scratches, stains, etc.

Action ...................... Open the CD lid, then reload the disc

correctly. Remove the scratches or stains
on the disc.

NO DISC

Error content ........... Focusing is impossible.

Probable cause....... The disc is loaded upside down, not CD-

DA, scratches, stains, etc.

Action ...................... Open the CD lid, then reload the disc

correctly. Remove the scratches or stains
on the disc.

Error content........... The detection SW "CAM-SW" cannot

detect ON (mechanism in operation) 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
connected CAM-SW. Mechanism stops:
Defective or poorly connected motor or
solenoid.

Action ...................... Solve the problem and turn on the power

again.

Tape mechanism error 2

Error content ........... Initialization cannot be completed when

the microcomputer controls the motor
and solenoid to initialize the tape
mechanism (to set the mechanism to the
stop mode). The detection SW "CAM­SW" cannot detect OFF While the
mechanism is in operation.

Probable cause....... Mechanism is in operation when this

message appears: Defective or poorly
connected CAM-SW. Mechanism stops:
Defective or poorly connected motor or
solenoid.

Action ...................... Solve the problem and turn on the power

again.

– 12 –

NOTES ON SCHEMA TIC DIAGRAM

XL-55/55C

• 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
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.

REF. NO

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

DESCRIPTION

POSITION POSITIONREF. NO

• The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas­sis 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.

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

FRONT

VIEW

ECB

(S)(G)(D)
(1) (2) (3)

TYPES OF TRANSISTOR AND LED

2HA1015 GR
2HC1815 GR
2SC2001 K
2SK2541
HSB562 C
KRA102 M
KRA107 M
KRC102 M
KRC104 M
KRC107 M
SC1674 C

FRONT

VIEW

BCE

KTC2026 Y

Figure 13 TYPES OF TRANSISTOR AND LED

MPG3372X

FRONT
VIEW

1 2 3

SVC348S
KDV147B

– 13 –

XL-55/55C

BF301
BAND

PASS

FILTER

AM/FM

ANTENNA

TERMINALS

CNP301

1
2
3

FM RF

L302

VD303

FM FRONT END

TA7358AP

VT

IC301

T306

AM OSC.

78654323211

AM TRACKING

T302

FM IF FM IF

CF303 T304

FM OSC

VT

L303

VD302

9

VD301-1
SVC348S

VD301-2
SVC348S

Q302

FM IF AMP.

Q306

FM MUTE LEVEL

VR351
10K(B)

AM OSC OUT

24 22

AM OSC OUT

FM IF IN

10.7MHz
CF302

3

1

FM IF

VT

D_GND

X352

4.5MHz

21

23

FM AFC

AM RF IN

AM OSC IN AM MIX OUT

FM IF DET./FM MPX./AM IF

LA1832S

REG

AM IF

T351

AM MIX OUT

TP301

21

22

20

VSS

AOUT

X OUT

LC72131

X IN

NC

1 2 3 4

20

IC303

4 3 2 1

AM IF IN

3

1

CF352

2

IC302

PLL (TUNER)

CE

VSM

AM IF IN

GND

5

DI

19

AM LOW CUT

SD

6

CL

6

5

18

FM/AM OUT

STEREO

7

CF351
FM IF

17

16

VDD

FM IN

FM

DO

7

X351
456kHz

FM DET

8

14

15

AM IN

FM

MUTE

8

9

9

+5V

12

13

NC

SW

IF IN

MO/ST

IF REQ

10

11

16

17

MPX VCO

VCC

10

MPX IN

PHASE

IF OUT

11

14

15

R-CH OUT

13

MO/ST

L-CH OUT

PHASE

(AM/FM)

12

SWITCHING

+5V

Q351

FM+B

ZD351

A_GND

R_MUTE

A_12V

R-MUTE

Q360

A_12V

RECORD/

PLAYBACK

HEAD

L-CH

R-CH

ERASE
HEAD

M901

TAPE MOTOR

M

SOL901
SOLENOID

CE

DI

CL

DO

IC101

HEAD SELECTOR

BA3126N

BIAS OSC

Q151

L151

Q172

SWITCHING

7

7

6

6

5

5

4

4

3

3

2

2

1

1

CNS901

1
2
3
4
5
6
7
8
9

P.F
CAM SW

REC SW

P/B SW
CONT

IC101

P/B SW

REC SW

REC

L-CH

CNP101

CNS101

L-CH

8

8

L-CH

7

7

A-GND

6

6

A-GND

5

5

R-CH

4

4

R-CH

3

3

ERASE

2

2

A-GND

1

1

PH901

PHOTE INTERRUPTER

CFW901

1

+

-

1

2

2

SW901
FOOL
PROOF

SW902
CAM

A-12V

Q171

SWITCHING

L-CH

R-CH

R-CH

CNP901

SWITCHING

Q152

Q153

SOLENOID

DRIVER

M_GND

Q101-Q104
SWITCHING

A_12V

SWITCHING

REC BIAS
CONT

Q903

SWITCHING

Q902

SWITCHING

L-IN

IC102
REC./P.B.
EQUALIZER
AMP.

R-IN

Q901

5

9

RUN PLS
SOL

TAPE MOTOR

M_12V

Q905

DRIVER

NF

3

11

NF

SWITCHING

IC102

150K

BA3311L

­+

MUTE ALC

+

-

150K

6

Q906

Q904

SWITCHING

L-OUT

7

U_CON5V

1

12

MOT

R-OUT

CNP703

8

10

2

ALC

REC MUTE

A_12V

BIAS

SURROUND

B-CAN(NC)

1234

TO DISPLAY PWB

RUN_PLS

REC

5

MOT

6

Q105
Q106

SOL

7

A_12V

U_CON 5V

D-GND

8

9

10 10

REC

TAPE SW

Figure 14 BLOCK DIAGRAM (1/4)

– 14 –

SOL

_MUTE

FM ST

CD+B

P MUTE

P-STB

SD

DO
CL
CE

DI

9
8
7
6

TO DISPLAY

5

PWB

4
3
2
1

CNS704

SO401

VIDEO/AUX IN

SUB

WOOFER

OUT

AUX R

SURROUND

5678

Q461Q463

4321

IC461
KIA4558P
OPE AMP.

XL-55/55C

A_12V

A_12V

R-MUTE

360

A_12V

STEREO

SD

REC L/R CH

TAPE L/R CH

MUTE

Q601

Q602

REC R CH

TAPE R
TUN R
CD R

CD L
TUN L
TAPE L
AUX L
REC L CH

L-IN

R-IN

13

9

11

15

16

14

13 12

IC401

LC75342M

18

17

IC601
LA4451
POWER
AMP.

R-CH OUT

11

10

8

9

7

FUNCTION/VOLUME EQUALIZER

19

20

L-CH OUT

2

R-CH OUT

5

3
4

Q603A
Q605A
Q609A

21

24

23

22

L-CH OUT

CE

2 1

VSS

LOGIC

VDD

29

1

FROM DISPLAY

2

PWB

+

SO601
SPEAKER
TERMINALS

+

J601
HEADPHONES

DI

30

CL

4 3

6

5

NC

26

25

27 28

A_12V

CNP652

A_12V
PROTECT

L-CH

L-CH

E
Q105

Q106

U_CON 5V

8

7

AY PWB

A_12V

D-GND

9

10 10

REC

TAPE SW

CD_6.2V

M_GND

CD R

D-GND

A-GND

CD L

4

5

123

6

TO CD SERVO PWB

CNP605

P-STB

CD_6.2V

MECHA 12V

(M_12V)

AUDIO 12V

(A_12V)

Q607

VOLTAGE

REGULATOR

Q605

Q604

Q606

Q608

CD+B

Q609

Q603

DISPLAY

PWB

VCC

12

7

T651

D651~D654

F651

4.0A 125V

D656~D659

CNS652

CNP652

1

1

2

2

GND

Q683

D656~D659

IC681

KIA7805P

CNP707

USWD_5R6V

3

TO

2
1

P-CONT

D_GND

VOLTAGE REGULATOR

13

2

GND

F652

1.6A 125V

GND

POWER

TRANSFORMER

(MAIN)

T681

POWER

TRANSFORMER

(SUB)

RLY681

AC POWER

INPUT SOCKET

AC120V,60Hz

T.F

SO651

Figure 15 BLOCK DIAGRAM (2/4)

– 15 –

XL-55/55C

C

C

D

A

C
M

_

G

CNS605

6
5

SW801
CD LID

4
3
2
1

M_

TO MAIN SECTION

CNP605

LCD701

~

514 38

~

39 42

OPEN/CLOSE

TO POWER

CNS707
1
2

3

KEY

USWD_5.6V

Q701

SW702-SW704
SW707-SW709

SW705,SW706
SW701

SYS_STOP

Q702
Q703

X702

32.768MHz

X701

8MHz

SW700

VOLUME

4

1

9

10

12
13
17
18

37

6
7
8

24

5
11
14
15
21

COM3

~

COM0

KEY1
KEY2

POWER

VLC2
VLC1
VDD

VREF+
VLC3
VSS
MMOD
VREF

~

100

SEG0

JOG_UP

JOG_DOWN

RX701

GP1U281X

REMOTE
SENSOR

1 2 3

IC701

IX0060SJ

SYSTEM CONTROL

MICROCOMPUTER

P_CONT

SYS_STOP

BACK_LIGHT

REMOCON

B-CAN

BIAS

REC

RUN_PLS

MOT

SOL

TAPE_SW

22 222930313435363938 51424741

67

SEG33

CLID_SW

MDATA

CD_STB

STEREO

P_MUTE

MCLK

MLD

BLBCK

STAT

MRST
PU_IN
GVSW

CD+B

P_STB

SURR

CNP702

CLID SW

65
65
64
63
62
61
60
59
58
33

SD

50
49
26

DO

CL

27

CE

28
25

DI

46
45
44
43

PROTECT

A–12V

TAPE_SW

A–12V

D_GND

U_CON5V

RUN_PLS

BIAS

B_CAN

SURROUND

STEREO

P_MUTE

P_STB

SOL
MOT
REC

CD+B

SD

DO
CL
CE

DI

CNS703

9
8
7
6
5
4
3
2
1

CNS704

CNS680

1
2

11
10

9
8
7
6
5
4
3
2
1

TO MAIN SECTION

CNP704

TO AMP. SECTION

CNP680

TO MAIN SECTION

CNP703

CD STB

MRST
MCLK

MLD

MDATA

BLKCK

STAT

PICK_IN

GVSW

10

9
8
7
6
5
4

3
2
1

D_GND

LED

D701~709

Q707

SWITCHING

Q706

Figure 16 BLOCK DIAGRAM (3/4)

– 16 –

M

TO MAIN SECTION

D

9
8
7

L

6

E

5

I

4

B

3

E

2

B

1

CNS704

CNP605

OPEN/CLOSE

TO MAIN SECTION

CNP704

SW801
CD LID

CLID SW

CD STB

MRST
MCLK

MLD
MDATA
BLKCK

STAT

PICK_IN

GVSW

CNS605

CNP702

10

6
5
4
3
2
1

M_GND

9
8
7
6
5
4

3
2
1

CD_L
A_GND

CD_R
D_GND
CD_6.2V

M_GND

+6.2V

CD_6.2V

CONSTANT

VOLTAGE

Q804

D_GND

+5V

+5V

4
5

9 8 7

13

18 17 16 14

DVDD1
DVSS1

MCLK
MDATA
MLD

BLKCK
SQCK

DMUTE
STAT
/RST

80

SSEL

TVR

21

79

78

77

76

75

74

PSEL

CSEL

RSEL

MSEL

OUTR

AVSS1

MN6627482W

SERVO/SIGNAL CONTROL

TRO

KICK

ECS

ECM

TVD

22

27

26

25

24

73

OUTL

FOO
28

72

71

/TEST

AVDD1

IC801

FBAL

VREF

30

29

70

IOSEL

TBAL

31

XL-55/55C

3

D_GND

2
1

X803

16.93MHz

J801
DIGITAL
OUT

+5V

6

TX

VDD

X2
X1

VSS

AVSS2

AVDD2

IREF

ARF

44 45 50 51 57 58 59 60

LD

BDO

/RFDET

TRCRS

OFT

VDET

RFENV

TE

FE

35

34

33

32

39

38

37

36

40

CNS680

CNS703

11
10

1
2

9
8
7
6
5
4
3
2
1

TO AMP. SECTION

CNP680

TO MAIN SECTION

CNP703

M_GND

SW800

PICKUP IN

M_GND

+5V

M

NM802

SPINDLE

MOTOR

FOCUS/TRACKING/

SPIN/SLED DRIVER

M

NM801

SLED

MOTOR

IC804

MM1469XH

14

OPO

13

GND

12

VO2–

11

VO2+

10

VIN2

9

VG2

8

GND

7

MUTE
REG O

6

TRB

5

VG1

4

VIN1

3

VO1+

2

VO1–

1

PO1–
PO1+
VO3–
VO3+

VIN3
VG3
VCC
VCC
BIAS
VG4

VIN4

VO4+
VO4–

GND

15
16
17
18
19
20
21
22
23
24
25
26
27
28

M_GND

+6.2V

FOCUS COIL

1/2V

TRACKING COIL

D_GND

17

VREF

18

VDET

19

TEBPF

20

TEOUT

21

TEN

22

FEN

23

FEOUT

24

GCTL

25

FBAL

26

TBAL

27

F

28

E

29

D
B

30

C

31

A

32

IC802
AN22000A

HEAD AMP.

C

F

A

B

E

NRFDET

CDFTR

3TOUT

RFOUT

MON

GND

OFTR

BDO

CBDO

CEA
ARF

CACC

RFIN

RFN
VCC

LD

16
15
14
13
12
11
10

9
8
7
6
5
4

3
LD
PD

+5V

2

1

Q801

LASER
DRIVER

+5V

+5V

VCC

PICKUP UNIT

GND

Figure 17 BLOCK DIAGRAM (4/4)

– 17 –