Sharp XL-HP737E User manual

SERVICE MANUAL
XL-HP737E/HP737H
No. S4418XLHP737H
MICRO COMPONENT SYSTEM
XL-HP737E
MODEL
SHARP CORPORATION
CONTENTS
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
CHAPTER 1. GENERAL DESCRIPTION
[1] SAFETY PRECAUTION FOR SERVICE
MANUAL .......................................................1-1
[2] IMPORTANTSERVICENOTES(FORU.K.
ONLY)............................................................1-1
[3] SPECIFICATIONS.........................................1-2
[4] NAMES OF PARTS.......................................1-3
CHAPTER 2. ADJUSTMENTS
[1] ADJUSTMENT..............................................2-1
[2] TEST MODE .................................................2-2
[3] Standard Specification of Stereo System
Error Message Display Contents...................2-4
CHAPTER 3. MECHANICAL DESCRIPTION
[1] REMOVING AND REINSTALLING THE
MAIN PARTS.................................................3-1
[2] DISASSEMBLY.............................................3-3
CHAPTER 4. DIAGRAMS
[1] BLOCK DIAGRAM ........................................4-1
CHAPTER 5. CIRCUIT DESCRIPTION
[1] WAVEFORMS OF CD CIRCUIT.....................5-1
[2] VOLTAGE .......................................................5-2
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] NOTES ON SCHEMATIC DIAGRAM .............6-1
[2] TYPES OF TRANSISTOR AND LED .............6-1
[3] WIRING SIDE OF PWB/SCHEMATIC DIA-
GRAM.............................................................6-2
CHAPTER 7. FLOWCHART
[1] TROUBLESHOOTING....................................7-1
CHAPTER 8. OTHERS
[1] FUNCTION TABLE OF IC...............................8-1
[2] FL DISPLAY..................................................8-15
[3] WIRING OF PRIMARILY SUPPLY LEADS
(FOR U.K. ONLY) .........................................8-16
Parts Guide
XL-HP737E Micro Component System consisting of XL-
HP737E (main unit) and CP-HP737E (speaker system).
XL-HP737H Micro Component System consisting of XL-
HP737H (main unit) and CP-HP737H (speaker system).
•
Note for users in U.K. Recordingandplaybackofany material mayrequireconsentwhich
SHARP is unable to give. Please refer particularly to the provisions
of Copyright Act 1956, the Dramatic and Musical Performers Pro-
tection Act 1956, the Performers Protection Acts 1963 and 1972
and to any subsequent statutory enactments and orders.
•
In the interests of user-safety the set should be restored to its origi- nal condition and only parts identical to those specified be used.
XL-HP737H
MODEL
Illustration XL-HP737E
(XL-HP737H ONLY)
(XL-HP737H ONLY)
Illustration XL-HP737H

XL-HP737E/HP737H
1 – 1
AudioXL-HP737E/HP737HService ManualXLHP737H/EMarketE
CHAPTER 1. GENERAL DESCRIPTION
[1] SAFETY PRECAUTION FOR SERVICE MANUAL
Precaution to be taken when replacing and servicing the Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class 1 Requirements. However, the follow-
ing precautions must be observed during servicing 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 outer than the lead-in posi-
tion, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.
2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior 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 - Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous radiation
exposure.
[2] IMPORTANT SERVICE NOTES (FOR U.K.
ONLY)
Before returning the unit to the customer after completion of a repair or
adjustment it is necessary for the following withstand 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 buzzer sounds.
PROBE
AC
OUT
UNIT
SHORT-CIRCUIT
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO GND OF CHASSIS
SCREW
WITHSTANDING
VOLTAGE TESTER

XL-HP737E/HP737H
1 – 2
[3] SPECIFICATIONS
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.
XL-HP737E
■General
■Amplifier
■CD player
■Tuner
■Cassette deck
■Speaker
Power source AC 230 V, 50 Hz
Power
consumption
98 W
Dimensions Width: 185 mm (7-1/4")
Height: 260 mm (10-1/4")
Depth: 307 mm (12")
Weight 6.6 kg (14.5 lbs.)
Output power RMS: 200 W (100 W + 100 W) (10 % T.H.D.)
RMS: 164 W (82 W + 82 W) (0.9 % T.H.D.)
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms
(recommended: 32 ohms)
Subwoofer pre-output (audio signal):
200 mV/10 k ohms at 70 Hz
Input terminals Video/Auxiliary (audio signal):
500 mV/47 k ohms
Type 5-disc multi-play 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 range FM: 87.5 - 108.0 MHz
AM: 522 - 1,620 kHz
Frequency
response
50 - 14,000 Hz (normal tape)
Signal/noise ratio 50 dB (recording/playback)
Wow and flutter 0.3 % (WRMS)
Type 2-way type speaker system
5 cm (2") tweeter
15 cm (5-7/8") woofer
Maximum input
power
200 W
Rated input power 100 W
Impedance 6 ohms
Dimensions Width: 180 mm (7-1/8")
Height: 261 mm (10-1/4")
Depth: 259 mm (10-3/16")
Weight 3.1 kg (6.8 lbs.)/each
XL-HP737H
■General
■Amplifier
■CD player
■Tuner
■Cassette deck
■Speaker
Power source AC 230 V, 50 Hz
Power
consumption
Power on: 98 W
Power stand-by: 0.6 W
Dimensions Width: 185 mm (7-1/4")
Height: 260 mm (10-1/4")
Depth: 307 mm (12")
Weight 6.6 kg (14.5 lbs.)
Output power PMPO: 720 W (total)
MPO: 360 W (180 W + 180 W) (DIN 45 324)
RMS: 200 W (100 W + 100 W) (DIN 45 324)
RMS:164W(82W+82W)(DIN45500)
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms
(recommended: 32 ohms)
Subwoofer pre-output (audio signal):
200 mV/10 k ohms at 70 Hz
Input terminals Video/Auxiliary (audio signal):
500mV/47kohms
Type 5-disc multi-play 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 range FM: 87.5 - 108.0 MHz
AM: 522 - 1,620 kHz
Frequency
response
50 - 14,000 Hz (normal tape)
Signal/noise ratio 50 dB (recording/playback)
Wow and flutter 0.35 % (DIN 45 511)
Type 2-way type speaker system
5cm(2")tweeter
15 cm (5-7/8") woofer
Maximum input
power
200 W
Rated input power 100 W
Impedance 6 ohms
Dimensions Width: 180 mm (7-1/8")
Height: 261 mm (10-1/4")
Depth: 259 mm (10-3/16")
Weight 3.1 kg (6.8 lbs.)/each
Specifications for this model are subject to change without prior notice.

XL-HP737E/HP737H
1 – 3
[4] NAMES OF PARTS
■Front panel
1. Disc Trays
2. Timer Indicator
3. On/Stand-by Button
4. Clock/Timer Button
5. Disc Track Down or Fast Reverse, Tape Fast Wind,
Tuner Preset Down, Time Down Button
6. Tape Reverse Play Button
7. Tape Reverse Mode Select Button
8. Cassette Compartment
9. Headphone Socket
10.DiscTrayOpen/CloseButton
11. Disc Number Select Buttons
12. Disc Direct Play Button
13. Illumination Light
14. Volume Control
15. Disc Track Up or Fast Forward, Tape Fast Wind,
Tuner Preset Up, Time Up Button
16. Memory/Set Button
17. Equaliser Mode Select Button
18. Extra Bass/Demo Mode Button
19. Disc Play or Repeat, Tape Forward Play Button
20. Disc or Tape Stop Button
21. CD Button
22. Tuner (Band) Button
23. Tape Button
24. Video/Auxiliary Button
25. Tape Record Pause Button
26. Tuning Up Button
27. Tuning Down Button
1
11
12
14
15
16
17
18
19
20
10
2
3
4
13
9
5
6
7
8
23
24
21 26
27
25
22
Illustration XL-HP737E
■Display
1. Disc Number Indicators
2. MP3 Folder Indicator
3. MP3 Title Indicators
4. MP3 Total Indicator
5. Sleep Indicator
6. Timer Play Indicator
7. Timer Recording Indicator
8. Tape Record Indicator
9. Daily Timer Indicator
10. FM Stereo Mode Indicator
11. FM Stereo Receiving Indicator
12. Memory Indicator
13. Tape Reverse Play Indicator
14. Tape Forward Play Indicator
15. Tape Reverse Mode Indicator
16. MP3 Disc Indicator
17. Extra Bass Indicator
18. Disc Repeat Play Indicator
19. Disc Pause Indicator
20. Disc Play Indicator
■Rear panel
1. Cooling Fan
2. Speaker Terminals
3. AC Power Lead
4. FM 75 Ohms Aerial Socket
5. AM Loop Aerial Socket
6. Video/Auxiliary (Audio Signal) Input Sockets
7. Subwoofer Pre-output Socket
■Speaker system
1
7
9
13 14
1110 12
456321 7 8
15
3
2
4
6
5
16 17 18
19 20
1. Tweeter
2. Woofer
3. Bass Reflex Duct
4. Speaker Wire
13
4
2
Illustration XL-HP737E

XL-HP737E/HP737H
1 – 4
■Front panel
1. Disc Trays
2. Timer Indicator
3. On/Stand-by Button
4. Clock/Timer Button
5. Disc Track Down or Fast Reverse, Tape Fast Wind,
Tuner Preset Down, Time Down Button
6. Tape Reverse Play Button
7. Tape Reverse Mode Select Button
8. Cassette Compartment
9. Headphone Socket
10.DiscTrayOpen/CloseButton
11. Disc Number Select Buttons
12. Disc Direct Play Button
13. Illumination Light
14. Volume Control
15. Disc Track Up or Fast Forward, Tape Fast Wind,
Tuner Preset Up, Time Up Button
16. Memory/Set Button
17. Equaliser Mode Select Button
18. Extra Bass/Demo Mode Button
19. Disc Play or Repeat, Tape Forward Play Button
20.DiscorTapeStopButton
21. RDS ASPM (Auto Station Programme Memory) Button
22. RDS Programme Type/
Traffic Information Search Button
23. RDS Display Mode Select Button
24. CD Button
25. Tuner (Band) Button
26. Tape Button
27. Video/Auxiliary Button
28. Tape Record Pause Button
29. Tuning Up Button
30. Tuning Down Button
1
11
12
15
16
17
18
19
20
10
2
3
4
9
5
6
7
8
26
27
29
30
28
21
22 24
2523
14
13
Illustration XL-HP737H
■Display
1. Disc Number Indicators
2. MP3 Folder Indicator
3. MP3 Title Indicators
4. RDS Indicator
5. Traffic Announcement Indicator
6. Dynamic PTY Indicator
7. Traffic Programme Indicator
8. MP3 Total Indicator
9. Sleep Indicator
10. Timer Play Indicator
11. Timer Recording Indicator
12. Tape Record Indicator
13. Daily Timer Indicator
14. FM Stereo Mode Indicator
15. FM Stereo Receiving Indicator
16. Memory Indicator
17. Tape Reverse Play Indicator
18. Tape Forward Play Indicator
19. Tape Reverse Mode Indicator
20. MP3 Disc Indicator
21. Extra Bass Indicator
22. Disc Repeat Play Indicator
23. Disc Pause Indicator
24. Disc Play Indicator
8 9321 1110764 125
20 21 22
23 24
13
17 18
1514 16
19
Illustration XL-HP737H

XL-HP737E/HP737H
1 – 5
■Rear panel
1. Cooling Fan
2. Speaker Terminals
3. AC Power Lead
4. FM 75 Ohms Aerial Socket
5. AM Loop Aerial Socket
6. Video/Auxiliary (Audio Signal) Input Sockets
7. Subwoofer Pre-output Socket
■Speaker system
1. Tweeter
2. Woofer
3. Bass Reflex Duct
4. Speaker Wire
1
7
3
2
4
6
5
13
4
2
Illustration XL-HP737H
■Remote control
1. Remote Control Transmitter
2. Disc Number Select Buttons
3. Cursor Buttons
4. Character Input/Disc Direct Search Buttons
5. Equaliser Mode Select Button
6. Extra Bass Button
7. On/Stand-by Button
8. CD Button
9. Tuner (Band) Button
10. Tape Button
11. Video/Auxiliary Button
12. Volume Up and Down Buttons
13. Disc Random Button
14. Disc Clear/Dimmer Button
15. Disc Stop Button
16. Tape Reverse Play Button
17. Tape Stop Button
18. Memory/Set Button
19. Disc Pause Button
20. Disc Play or Repeat Button
21. Tape Forward Play Button
22. Tape Record Pause Button
23. MP3 Disc Navigation Mode Select Button
24. MP3 Disc Display Button
25. Enter Button
26. Clock/Timer Button
27. Character Button
28. Disc Track Down or Fast Reverse, Tape Fast Wind,
Tuner Preset Down, Time Down Button
29. Disc Track Up or Fast Forward, Tape Fast Wind,
Tuner Preset Up, Time Up Button
1
2
10
11
12
8
9
7
4
3
5
6
13 18
19
21
22
14
15
16
17
20
23
26 27 28 29
24 25

XL-HP737E/HP737H
2 – 1
AudioXL-HP737E/HP737HService ManualXLHP737H/EMarketE
CHAPTER 2. ADJUSTMENTS
[1] ADJUSTMENT
1. MECHANISM SECTION
•Driving Force Check
•Torque Check
2. TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
•AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Notes:
1. Description of the "FM IF Adjustment" is not carried on this Manual.
It is because the IF coil in the FM front end section has been best
adjusted in the factory so that its further adjustment is not needed
at the field. When replacing the FM front end assembly, no adjust-
ment is needed either.
2. The parts in the FM front end section are prepared in a complete
unit, so you can't obtain each part individually.
•Tape Speed
3. CD SECTION
•Adjustment
Since this CD system incorporates the following automatic adjust-
ment functions, readjustment is not needed when replacing the
pickup. Therefore, different PWBs and pickups can be combined
freely.
Each time a disc is changed, these adjustments are performed
automatically. Therefore, playback of each disc can be performed
under optimum conditions.
Items adjusted automatically
1) Offset adjustment (The offset voltage between the head amplifier
output and the VREF reference voltage is compensated inside the
IC.)
* Focus offset adjustment
* Tracking offset adjustment
2) Tracking balance adjustment
3) Gain adjustment (The gain is compensated inside the IC so that the
loop gain at the gain crossover frequency will be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
4. CD ERROR CODE DESCRIPTION
* 'CHECKING'
If Error is detected, 'CHECKING' will be displayed instead of 'ER-
CD**'. 'ER-CD**' display will only be displayed when error had been
detected for the 5th times.
Torque Meter Specified Value
Play: TW-2111 Over 80 g
Torque Meter Specified Value
Play: TW-2111 30 to 80 g.cm
Fast forward: TW-2231 70 to 180 g.cm
Rewind: TW-2231 70 to 180 g.cm
Test Stage Frequency Frequency
Display Setting/ Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,620 kHz T351 *1
AM Band
Coverage — 522 kHz (fL): T306 1.1 ± 0.1 V *2
AM Tracking 990 kHz 990 kHz (fL): T303 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
Figure 2 ADJUSTMENT POINTS
AM
LOOP
ANTENNA
IC302
T351
IC303
L354
T303
T306
CNP302
SO301
FE301
TP302
TP301
AM TRACKING fL
AM BAND
COVERAGE fL
AM IF
ANTENNA
TERMINAL
TUNER PWB-C
20
R357
R356
C393
Test Tape Adjusting
Point Specified Value Instrument Connection
Normal
speed MTT-111 Variable Resistor in
motor.
3,000 ± 30 Hz Speaker Ter-
minal (Load
resistance:6
ohms)
Figure 1
Error Explanation
01 When Pickup set inner position, inner switch cannot detect
'ON' level for 10 secs.
10* CAM error. Can't detect CAM switch when CAM is moving.
11* When it detect cam operation error during initialize process.
20* TRAY error. Can't detect TRAY switch when TRAY is mov-
ing.
21* When it detect TRAY operation error during initialize pro-
cess.
31 When it change to CD function, DSP cannot read initial data.
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor

XL-HP737E/HP737H
2 – 2
[2] TEST MODE
•Setting the test mode
During stand-by mode, press ON/STAND-BY button while pressing
down the button and X-BASS/DEMO button. then, press the CD
button to enter the test mode.
IL isn’t done
OPEN/CLOSE operation is using manual. IL isn’t done
<< >>,<< >>buttons make pick's slide possible. IL isn’t done
to page 2-3
<<PLAY>> key input.
C D T E S T
A
Do TOC IL. Do normal play.
When these following key is input into PLAY key, track num-
ber can be appoint directly.
<<MEMORY>>
key input.
<< 1>> key: Track 4
<< 2>> key: Track 9
<< 3>> key: Track 15
Adjustment result automatically will
display as below for each 2 sec:
a) "FOF_XXXX"
b) "TOF_XXXX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"
––––––––
<<STOP>> key input.
STOP
explanation:
a) Focus off set = "FOF_XXXX"
b)Tracking off set = "TOF_XXXX"
c)Tracking balance = "TBAL_XX"
d)Tracking Gain = "TGAN_XX"
f) Focus Gain = "FGAN_XX"
g) RF level shift = "RFLS_XX"
VOL — Last memory
P.GEQ — FLAT
X-BASS — OFF
To cancel: Power OFF

XL-HP737E/HP737H
2 – 3
Sliding the PICKUP with<< >>, << >> button must only be
in STOP mode.
<<MEMORY>> key input.
Laser ON.
<<MEMORY>> key input.
Tracking OFF play at that specific point.
<<MEMORY>> key input.
Tracking ON play from that specific point.
<<MEMORY>> key input.
Adjustment result automatically will display as below for each 2 sec:
a) "FOF_XXXX"
b) "TOF_XXXX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"
<<STOP>> key input.
STOP
explanation:
a) Focus off set = "FOF_XXXX"
b)Tracking off set = "TOF_XXXX"
c)Tracking balance = "TBAL_XX"
d)Tracking Gain = "TGAN_XX"
f) Focus Gain = "FGAN_XX"
g) RF level shift = "RFLS_XX"
VOL — Last memory
P.GEQ — FLAT
X-BASS — OFF
To cancel: Power OFF
A

XL-HP737E/HP737H
2 – 4
[3] Standard Specification of Stereo System Error Message Display Contents
(*) CHECKING:
If CD changer mechanism error is detected, 'CHECKING' will be display instead of 'ER-CD**'. 'ER-CD**' display will only be display when error had
been detected for the 5 th times.
Speaker abnormal detection and +B PROTECTION display
In case speaker abnormal detection or +B PROTECTION had occurred, it can be check by pressing 'POWER', ' ' and 'X-BASS' button. Micro-
Computer version number will displayed as "UM******".
Press ‘VIDEO/AUX’ button during version number display and then press ‘POWER’, ‘MEMORY/SET’ and ‘VIDEO/AUX’ button. Display will show "S**
B**". S is referring to speaker abnormal detection and B is referring to +B PROTECTION. ** is in hex valve.
+B PROTECTION is condition when irregular process occur on power supply line.
BEFORE TRANSPORTING THE UNIT
The following process need to be taken after set tapering/parts replacement.
1. Press the ON/STAND-BY button to enter stand-by mode.
2. While pressing down the button and the X-BASS/DEMO button, press the ON/STAND-BY button. The Micro Computer version number will
be displayed as "UM******".
3. Press OPEN/CLOSE button until "WAIT"--> "FINISHED" appears.
4. Unplug the AC cord and the unit is ready for transporting.
Error Contents DISPLAY Notes
CD Pickup Mechanism Error. 'ER-CD01' PU-IN SW Detection NG.
CD Changer Mechanism Error. 'ER-CD**' (*) 10: CAM SW Detection NG during normal operation
11: CAM SW Detection NG during initialize process
20:TRAY SW Detection NG during normal operation
21:TRAY SW Detection NG during initialize process
CD DSP Communication Error. 'ER-CD31' DSP COMMUNICATION ERROR.
Focus Not Match/IL Time Over. 'NO DISC'
TUNER PLL Unlock. FM MHz PLL Unlock.
87.50

XL-HP737E/HP737H
3 – 1
AudioXL-HP737E/HP737HService ManualXLHP737H/EMarketE
CHAPTER 3. MECHANICAL DESCRIPTION
[1] REMOVING AND REINSTALLING THE
MAIN PARTS
1. TAPE MECHANISM SECTION
Perform steps 1 to 9 of the disassembly method to remove the tape
mechanism.(see page 3-3,3-4)
1.1. How to remove the Record/Playback Head (See Fig. 1)
1. When you remove the screws (A1) x 2 pcs and (A2) x 1 pc., the
record/playback head can be removed.
1.2. How to remove the Pinch Roller (See Fig. 2)
1. Carefully bend the pinch roller pawl in the direction of the arrow
<A>, and remove the pinch roller (B1) x 1 pc., in the direction of the
arrow <B>.
NOTE: When installing the pinch roller, pay attention to the spring
mounting position.
1.3. How to remove the Belt (See Fig. 3)
1. Remove the main belt (C1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (C2) x 1 pc.
1.4. How to remove the Motor (See Fig. 4)
1. Remove the screws (D1) x 2 pcs., to remove the motor.
Figure 1
Figure 2
Figure 3
Figure 4
(A1)x2
Ø2x6mm
(A2)x1
Ø2x9mm
Record/Playback
Head
Erase Head
Clutch Ass'y
Pinch Roller
(B1)x1 <A>
<B>
Pinch
Roller
Pawl
Pull
Main Belt
(C1)x1
FF/REW
Belt
(C2)x1
Motor
FF/REW
Clutch
Flywheel
(D1)x2
Ø2.6x5mm
Motor
Clutch Ass'y

XL-HP737E/HP737H
3 – 2
2. CD MECHANISM SECTION
Perform steps 1 to 4 and 11 to 12 of the disassembly method to
remove the CD mechanism.(see page 3-3,3-4)
2.1. How to remove the Optical Pickup (See Fig. 1)
1. Remove the stop washer (A1) x 1 pc and gear (A2) x 1 pc.
2. Remove the screws (A3) x 2 pcs and shaft (A4) x 1 pc.
3. Remove the optical pickup.
NOTE: After pulling out the optical pickup connector, wrap the tip of it
with conductive aluminium foil or the like to protect the optical
pickup from the static electricity.
2.2. How to remove CD Disc (See Fig. 2~6)
1. When CD is at play position, rotate reduction gear C clock-wise as
shown in Figure 2 Until disk tray is at ‘STOCK’ position, then rotate
the gear further to eject the disk tray (Figure 6) so that CD can be
removed from the tray.
2. In another case, if CD mechanism is at tray No. 1 play position and
to remove CD located in tray No. 3, the procedure is as follows:
If the gear up down board is located at tray No. 1 position, then
rotate Reduction gear C clock-wise until Disc tray is at ‘STOCK’
position. Rotate reduction gear D clock-wise (Figure 3) to move the
CD mechanism to tray No. 3 position. This is confirmed by check-
ing the gear up down board position base on the marking as indi-
cated on the main chassis as shown in Figure 4.
• Usually changer is covered with top plate. As for reference pur-
pose, we exclude the top plate for easy viewing. (Figure 5,6)
Figure 6
CD Disc
CD At 'PLAY' position.
Disc Tray
Guide Tray
CD Disc
CD At 'STOCK' position.
CD Disc
Tray eject
Remove CD from tray.
Figure 5
Figure 1
Figure 4
(A3) x2
ø2.6 x5mm
CD
Mechanism
Stop Washer
(A1) x1
Optical Pickup
Gear
(A2) x1
Shaft
(A4) x1
Reduction gear D
Figure 3
Up Down
Reduction gear C
Front
Figure 2
Rear
Mark 1
(DISC 1)
(DISC 2)
(DISC 3)
(DISC 4)
(DISC 5)
Gear up down board
Mark 3 Mark 5
Mark 2 Mark 4

XL-HP737E/HP737H
3 – 3
[2] DISASSEMBLY
Note 1:
After removing the connector for the optical pickup from the connector,
wrap the conductive aluminium foil around the front end of the connec-
tor so as 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 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 disas-
sembling.
4) Take sufficient care on static electricity of integrated circuits and
other circuits when servicing.
STEP REMOVAL PROCEDURE FIGURE
1 Cabinet 1. Screw..........................(A1) x11 1
2 Rear Panel Top 1. Screw............................(B1) x2 1
3 CD Changer unit 1. Hook.............................(C1) x2
2. Socket..........................(C2) x1
3. Flat Cable.....................(C3) x1
2
4 Rear Panel
Bottom 1. Screw...........................(D1) x8 2
5 Front Panel 1. Screw...........................(E1) x3
2. Flat Cable....................(E2) x2
3. Socket..........................(E3) x1
4. Hook............................(E4) x2
2,3
3
6 Tuner PWB 1. Screw............................(F1) x1
2. Socket..........................(F2) x1 2 3
7 Main PWB 1. Screw...........................(G1) x2
2. Socket.........................(G2) x4 2,4 4
8 Power PWB 1. Screw...........................(H1) x4 4
9 Terminal PWB 1. Screw............................(J1) x1 4
10 Display PWB 1. Knob.............................(K1) x1
2. Screw...........................(K2) x 8
3. Flat Cable....................(K3) x 1
5
11 Tape Mechanism 1. Screw...........................(L1) x 4 5
12 Headphones
PWB 1. Screw..........................(M1) x 1 5
13 CD MP3 PWB
(Note 1) 1. Screw...........................(N1) x2 2. Flat Cable...................(N2) x 2
3. Socket..........................(N3) x1
6
14 CD Mechanism 1. Screw...........................(P1) x4
2. Screw...........................(P2) x4 6 7
Figure 1
Figure 2
Figure 3
(A1) x1
ø3x10mm
(A1) x2
ø3x8mm
(A1) x1
ø3x10mm
(A1) x1
ø3x8mm
(A1) x2
ø3x8mm
(B1) x2
ø3x10mm
(A1) x2
ø3x8mm
(A1) x2
ø3x8mm
Front Panel
Cabinet
Rear
Panel Bottom
Rear
Panel Top
(D1) x8
ø3x8mm
(F1) x1
ø3x8mm
(G1) x1
ø3x10mm
(E1) x1
ø3x10mm
(E2) x1
(C2) x1
(C3) x1
Front Panel
Rear
Panel Bottom
Hook
(C1)x1
Hook
(C1)x1
Pull
Pull
CD Changer
Unit
Main PWB
Headphones
PWB
CD MP3 PWB
(F2) x1
(E1) x2
ø3x10mm
Front Panel
Tuner PWB
Main PWB
(E2) x1
Pull
(E3) x1
Tape
Mechanism
Pull
Hook
(E4)x1
Hook
(E4)x1

XL-HP737E/HP737H
3 – 4
Figure 4
Figure 5
Figure 6
(G1) x1
ø3x6mm
(H1) x4
ø4x6mm
(J1) x1
ø3x6mm
(G2) x2
(G2) x2
Terminal PWB
Main PWB
Power PWB
(K2) x8
ø2.6x8mm
(L1) x4
ø3x10mm
(M1) x1
ø3x10mm
(K3) x1
(K1) x1
Front Panel
Headphones
PWB
Cassette
Holder
Display PWB
Tape
Mechanism
(N1) x2
ø3x10mm
(N2) x2
(N3) x1
(P1) x2
ø3x10mm
(P1) x2
ø3x10mm
CD Changer
Unit
CD MP3 PWB
Figure 7
STEP REMOVAL PROCEDURE FIGURE
1Woofer/
Tweeter 1. Net Frame................(A1) x1 2. Catching Holder.......(A2) x4
3. Screw.......................(A3) x4
4. Front Panel..............(A4) x1
5. Screw.......................(A5) x6
8
Figure 8
(P2) x4
ø2.6x10mm
CD Changer
Unit
CD Mechanism
Net Frame
(A1) x1
Screwdriver
(A5)x2
ø3.5x14mm
(A3)x2
ø3.5x16mm
(A2)x2
(A2) x2
(A3) x2
ø3.5x16mm
(A5)x4
ø3.5x14mm Woofer
Front Panel
(A4) x1
Tweeter

XL-HP737E/HP737H
3 – 5
—MEMO—

XL-HP737E/HP737H
4 – 1
AudioXL-HP737E/HP737HService ManualXLHP737H/EMarketE
CHAPTER 4. DIAGRAMS
[1] BLOCK DIAGRAM
+B5
+B5 +B5 +B10
+B5
RDS CIRCUIT:H ONLY
+B8(D_+5V)
+B9(SW_+5V)
+B_PROTECT
+B7(A_+5V)
VIDEO/AUX
R
L
R
L
ATT
ñ20dB
Q108
REC/PLAY
CLK
CE
DI
L
R
BIAS
MUTING
AC BIAS
L
L
R
R
R
L
TAPE
TUNER
CD
PB
CNP2
FROM CD SECTION
HEAD
ERASE
SWITCHING
SWITCHING
SWITCHING
BIAS
Q113
Q114
Q112
SWITCHING
OSC
BIAS
Q105
Q106
REC /P.B. HEAD
TAPE R-CH
L-CH
AUDIO PROCESSOR
LC75341
R
L
REC
R
L
RREC
LREC
SWITCHING L(TA)
R(TA)
/PLAYBACK AMP.
PLAYBACK AND RECORD
AN7345K
Q107
+B5
UN
S
SYSTEM
MUTE
17
3
1
2
2
7
18
4
21
13
16
9
23
2
21
13
12
14
16
11
1
4
9
10
15
3
24
12
15
11
718 8 23
+B5
+B4
H/N
P.B
REC
A_+10V
LD_+8V
F OUT
ST FM
R
L
IF OUT
AM IN
FM IN
COVERAGE
AM BAND
TRACKING
AM
TERMINAL
ANTENNA 5.1V
FM IF
L341
BALUN
ANTENNA
AM LOOP
FM
+B
+B5
CL
AM IF
456kHz
10.7MHz
450kHz
DO DI CE
MO/ST
SWITCHING
FM/AM
PLL(TUNER)
LC72131
FM/AM OUT
R
L
FM/AM MPXIN
STEREO
AM RF IN
AM OSC IN
VSM
FM
VT
OSC
4.5MHZ
MO/ST
VCO
FM
DET
FM+B
GND
AM IF
FM IF DET./
LA1832S
AM MIX
OUT
FM FRONT END
AM OSC OUT
FM MPX./AM IF
1516
10
1220
3762
8
5
1
34
217
16242120
15
23
51
910
18
89542
7
117
622 11
17
13
14
12
Q601
Q602 Q604
Q603
IC601
JK690
CNS2
Q104
Q101-
IC101
L103
Q111 Q110
Q109
Q851
SO301
FE301 CF301 Q301
IC303
CF352
T351
CF302
CF351
ZD351
X351
IC302
Q360
X352
ICT21
LC72723
RDS DECORDER
16
15
14
13
910
2
3
11
74
MPX IN VDDA XOUT
XIN
QT21
XT21
4.332 MHz
RST RDDA RDCL RDS-ID/ READY
VSSD TEST VSSA
VDDD
8
LOW PASS
FILTER
L354
Figure 4-1 BLOCK DIAGRAM (1/4)

XL-HP737E/HP737H
4 – 2
+B10
+B10
+B10
+B10
+B3
+B10
+B3
AN80T53
MULTI
REGULATOR
235671 4
+B4(8V)
T2A L 250V
T2A L 250V
T4A L 250V
T2A L 250V
D842-D845
HONLY
EONLY
EONLY
POWER
TRANSFORMER
RELAY
DRIVER
AC_RLY
P_IN
AC_RLY
T_SOL
T_MOTOR
VOL_JOG
PROTECT
+B8(D_5V)
+B7(A_5V)
+B7(A_5V)
+B9(SW_+5V)
+B_PROTECT
13V SW VCC GND 5.1V 8.5V 10V
VL+
VLñ
GND
SMUTE
TIME LED
SP_RLY
T_REC/PLAY T_BIAS
VLOAD
VOL_LED
P_IN
AC 230V,50 Hz
SUPPLY CORD
AC POWER
SP DET
–VF
T.F
VDD
TRANSFORMER
POWER
REGULATOR
VOLTAGE
UNSW_5.6V AN78L05
VOLTAGE
REGULATOR
VR701
VOLUME
KEY
ASS'Y
MECHANISM
TAPE
DRIVER
T4A L 250V
R-OUT
L-OUT
STK412-490
POWER AMP.
L
R
VLñ
VHñ
VL+
VH+
VF1
VF2
M971
RESET
4.19403MHz
REMOTE SENSOR
VDD -20dBATT
+B10
+B10 LED701
LED708
+B5
VDD
+B3
FAN MOTOR
FL DISPLAY
CE CLK DI DO
TO CD SECTION
RESET
AVDD
REMOCON
HEADPHONES
SUB WOOFER
PRE-OUT
SPEAKER TERMINAL
M
SYSTEM
MUTE
8
11
6
1
14
18
7
48
5
2
4443
242115121176
10
17 18 19 2034
215051
2
3
1
31
30
29
47
53
56
41
42
45
79
36
38 46 2540 13
33
34
39
12 16
(SUB)
(MAIN)
MOTOR/
DRIVER
SOLENOID
+
10V
_
+8V
SW701-SW705 SW706-SW708
HOnly
SW709-SW728
S30
S10
S9
G1
VF1
VF2
4785
78
58
80
4
100
SYSTEM
MICROCOMPUTER
TUN_SM/SPAN
27
49
52
IXA021AW:
ILLU_LED
LED707
9
FL701
RX701
Q906
XL700
Q701,702
Q712~715
Q904
Q901
IC901
F802
6
04
6
03
IC854
Q841
1
Q801
F804
F803
IC851
D802
D801
F801
F805
PT801
JK953
JK701
SO901
RL914
Q905
Q711
Q703
RL841
RELAY
PT841
RELAY
IC701
Q710
L841
AC LINE
FILTER
Figure 4-2 BLOCK DIAGRAM (2/4)

XL-HP737E/HP737H
4 – 3
+B4 +B8 +B7
LDS
LDD
MOT_A-/CONT4
MOT_A+/CONT5
M0_SPEED/CONT6
MO_B+/CONT3
MO_B-/CONT2
SPDO
SLDO
TDO
FDO
F16MOUT
SUB CE NC
C2F/SBCK
DATA
F16MIN
VVDD DVDD DVDD AVDD2 AVDD1 FIN EIN DIN BIN CIN AIN
XOUT
XIN
+5V
RCHO
LCHO
RVDD
LVDD
ZD1
DRF
*RES
*WRG
DO
DI
CL
CE
TO MAIN SECTION
TRAY_SW1 DISC CLAMP CL DI DO CE DRF WRQ
TO DISPLAY SECTION
+5V(+B9) D_GND PHOTO TRAY_SW2 CD_RES
D_GND
TRAY_SW2 TRAY_SW1
CLAMP
DISC
PHOTO
+5V
CAM+
CAM-
TR+
TR-
CNP6
CNP5
16.9344MHz
+3.3V
+3.3V
Q2
DRIVER
LASER
PICKUP UNIT
FOCUS COIL
TRACKING COIL
S
PICKUP-IN
SW1A
LC78648E
IC1
XL1
CD DIGITAL SIGNAL
PROCESSOR
24
23
22
21
75
74
70
36
35
PU-IN/CONT1 34
20
19
32
61
79
48
45
44
42
41
47
66 65 6468 67 63 62 51 53 59 69
1516 161114 13 12 510 3798 4 2
27 1266080
XVDD
49 789101415 2840 25
CNP2
+8V +5V DGND L-CH AGND R-CH D_GND +5V
17632548
Q1
GND
CNB1 1234567891011
1234567891011
–
+
–
+
M
M
TRAY
MOTOR
DISC
CLAMP
TRAY SW1
TRAY SW2
MAIN CAM
MOTOR
PHOTO INTERRUPTER
M1
RX1
SW3
SW2
SW1
SW4
M2
Figure 4-3 BLOCK DIAGRAM (3/4)

XL-HP737E/HP737H
4 – 4
+5V
+5V
+3.3V
+2.0V
++ --
M
M
SPIN/SLED DRIVER
REGULATOR
REGULATOR
VOLTAGE
VOLTAGE
SI3033LUS
IC6
MDATA15
MDATA12
MDATA11
MDATA8
ADRS8
ADRS4
ADRS3
ADRS0
DRASB
DWEB
MDATA7
MDATA4
MDATA3
MDATA0
DCASLB
DCASUB
D0EM
VCC
VCC
VCC
ADRS0
ADRS7
ADRSB
WEB
RASB
MDATA15
MDATA8
MDATA7
MDATA0
OEB CASUB CASLB DVDD6 DVDD5 DVDD4 DVDD3 DVDD2 DVDD1 INTB CMDOUT FSYNC
X1 X2
RESET
CE
CL
SYS-DI
FSYNC
MP3 DO
INTB
XL2
Q5
Q4
Q3
Q6
MICROCOMPUTER
SPINDLE
SLED
M2A
M1A
MOTOR
MOTOR
PICKUP-IN
SW1A
MP3 DECORDER
LC78684E
IC3
LRSY
ADDATA
ADBCK
ADLRCK
C2FIN
CKIN(16M)
CKOUT
DATAIN
DATACK
IC4
IC2
LA6261
IC5
IXA006AW
SYS-CE
SYS-CL
SYS-DO
AVDD
VDD VDD
FOCUS/TRACKING
4.19MHz
D-RAM
28
33
34
21
24
31
32
43135
13111517
23665
27
9
10
19 23 2220
25
19
18
11
10
301214291743
15
16
144282627 9232437
2
13
29
30
31
23
44
39
1
6
22
53
50
30
33
40
23
42
60
41
2
5
7
10
43
40
38
35
28
24
21
18
16
15
76
75
32
69
62
14
20
22
52
10
12
8
6
43 44 45 68 61 51 31 21 11 77 73 66
80 979 7 5 4 3 2 1
MO_B- MO_B+
MOT_A+ MOT_A-
VIN4
VIN3 VIN1 VIN2
VO4+ VO4- VO3+ VO3-
PVCC1
SVCC
PVCC2
REGOUT
VO1- VO1+ VO2- VO2+
LC32V4265B
Figure 4-4 BLOCK DIAGRAM (4/4)

XL-HP737E/HP737H
5 – 1
AudioXL-HP737E/HP737HService ManualXLHP737H/EMarketE
CHAPTER 5. CIRCUIT DESCRIPTION
[1] WAVEFORMS OF CD CIRCUIT
T
FDO
TDO
Stopped
CH1=500 mV
DC 10:1
CH3=500 mV
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
3
=Record Length=
Smoothing : ON CH1 : 0.000 V
CH2 : 0.0 V
Main : 100 K
Zoom : 2 K
Mode : AUTO
Type : EDGE CH1
Delay : 0.0 ns
Hold off : 0.2 µs
CH3 : 0.000 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
CH1
v/DIV
500 mV
1IC1 21
2IC1 22
T
FDO
DRF
TE
Stopped
CH1=500 mV
DC 10:1
CH2=10 V
DC 10:1
CH3=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing : ON CH1 : 0.000 V
CH2 : 0.0 V
Main : 100 K
Zoom : 2 K
Mode : AUTO
Type : EDGE CH1
Delay : 0.0 ns
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
-3 div -1 div 0 div +1 div +3 div
CH Position To
CH2
Position
0.20 div
1IC1 21
3IC1 68
4IC1 17
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 µsec/div
5IC1 4
T
T
TE
DRF
Stopped
CH1=10 V
DC 10:1
CH2=1 V
DC 10:1
100 ms/div
(100 ms/div)
NORM:100 kS/s
2
1
=Record Length=
Smoothing : ON CH1 : 0.0 V
CH2 : 0.00 V
Main : 100 K
Zoom : 2 K
Mode : NORMAL
Type : EDGE CH1
Delay : 2.924 ms
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger=
=Filter= =Offset=
3IC1 68
4IC1 17
T
T
FDO
SPDO
Stopped
CH1=200 mV
DC 10:1
CH2=500 mV
DC 10:1
500 ms/div
1999/04/07 09:51:15
(500 ms/div)
NORM:20 kS/s
2
1
=Record Length=
Smoothing : ON CH1 : 0.000 V
CH2 : 0.000 V
Main : 100 K
Zoom : 2 K
Mode : NORMAL
Type : EDGE CH2
Delay : 2.924 ms
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
1IC1 21
6IC1 24
T
FDO
PDO2
PDO1
Stopped
CH1=500 mV
DC 10:1
CH3=1 V
DC 10:1
CH4=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
4
3
=Record Length=
Smoothing : ON CH1 : 0.000 V
CH2 : 0.0 V
Main : 100 K
Zoom : 2 K
Mode : AUTO
Type : EDGE CH2
Delay : 0.0 ns
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
CH1
v/DIV
500 mV
1999/04/05 17:33:17
1IC1 21
7IC1 76
8IC1 77
T
T
DOUT
Stopped
CH1=2 V
DC 10:1
500 ns/div
1999/04/07 09:25:28
(500 ns/div)
NORM:200 MS/s
1
=Record Length=
Smoothing : ON CH1 : 0.00 V
CH2 : 0.00 V
Main : 1 K
Zoom : 100
Mode : NORMAL
Type : EDGE CH1
Delay : 2.887 ms
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
9IC1 39
T
T
DATA
DATACK
LRSY
Stopped
CH1=2 V
DC 10:1
CH2=2 V
DC 10:1
CH3=2 V
DC 10:1
5 µs/div
(5 µs/div)
NORM:100 kS/s
1
2
3
=Record Length=
Smoothing : ON CH1 : 0.00 V
CH2 : 0.00 V
Main : 5 K
Zoom : 100
Mode : AUTO
Type : EDGE CH3
Delay : 0.0 ns
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
CH3
v/DIV
2V
1999/04/05 20:50:17
10 IC1 57
IC1 58
IC1 59
11
12