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ORDER NO.
CRT5331
AVH-X7500BT/XNUC

DVD RDS AV RECEIVER

AVH-X7500BT /XNUC

AVH-X7500BT /XNEW5

AVH-X7500BT /XNUW5

AVH-X7550BT /XNRC

AVH-X7550BT /XNRD

AVH-X7550BT /XNRI

This service manual should be used together with the following manual(s):
Model No. Order No. Mech.Module Remarks

CX-3268 CRT4534 MS7 DVD Mech. Module : Circuit Descriptions, Mech. Descriptions, Disassembly

www.electronicsrepair.net
K-ZZZ MAR. 2013 Printed in Japan
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SAFETY INFORMATION
CAUTION
A
This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so
and refer the repair to a qualified service technician.

WARNING

This product may contain a chemical known to the State of California to cause cancer, or birth defects or other reproductive
B harm.
Health & Safety Code Section 25249.6 - Proposition 65

Where in a manufacturer's service documentation, for example in circuit diagrams or lists
of components, a symbol is used to indicate that a specific component shall be replaced only
by the component specified in that documentation for safety reasons, the following symbol shall
be used:

- Safety Precautions for those who Service this Unit.
When checking or adjusting the emitting power of the laser diode exercise caution in order to get safe, reliable
results.
C

Caution:
1. During repair or tests, minimum distance of 13 cm from the focus lens must be kept.
2. During repair or tests, do not view laser beam for 10 seconds or longer.

CAUTION:
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

CAUTION
D
This product is a class 1 laser product classi-
fied under the Safety of laser products, IEC
60825-1:2007, and contains a class 1M laser
module. To ensure continued safety, do not re-
move any covers or attempt to gain access to
the inside of the product. Refer all servicing to
qualified personnel.

CAUTION--CLASS 1M INVISIBLE LASER
E RADIATION WHEN OPEN, DO NOT VIEW
DIRECTLY WITH OPTICAL INSTRUMENTS.

WARNING!
The AEL (accessible emission level )of the laser power output is less than CLASS 1
but the laser component is capable of emitting radiation exceeding the limit for
CLASS 1.
A specially instructed person should do servicing operation of the apparatus.

AVH-X7500BT/XNUC
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A
Laser diode characteristics
Wave length:
DVD:660 nm to 670 nm
CD:780 nm to 800 nm
Focus lens on Maximum output:
CD:6.26 mW(Emitting period :9 sec.)
DVD:1.27 mW (Emitting period : unlimited)

Additional Laser Caution
B
Transistors Q1103 and Q1104 in PCB drive the laser diodes for DVD and CD
respectively. When Q1103 or Q1104 is shorted between their terminals,
the laser diodes for DVD or CD will radiate beam. If the top cover is removed
with no disc loaded while such short-circuit is continued, the naked eyes may
be exposed to the laser beam.

CAUTION
Danger of explosion if battery is incorrectly replaced. C
Replaced only with the same or equivalent type recommended by the manufacturer.
Discord used batteries according to the manufacturer's instructions.

AVH-X7500BT/XNUC
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CONTENTS
SAFETY INFORMATION..................................................................................................................................... 2
1. SERVICE PRECAUTIONS ............................................................................................................................... 5
A
1.1 SERVICE PRECAUTIONS ........................................................................................................................ 5
1.2 NOTES ON SOLDERING .......................................................................................................................... 7
2. SPECIFICATIONS ............................................................................................................................................ 8
2.1 SPECIFICATIONS ..................................................................................................................................... 8
2.2 DISC/CONTENT FORMAT ...................................................................................................................... 16
3. BASIC ITEMS FOR SERVICE........................................................................................................................ 17
3.1 CHECK POINTS AFTER SERVICING..................................................................................................... 17
3.2 PCB LOCATIONS .................................................................................................................................... 18
3.3 JIGS LIST ................................................................................................................................................ 19
3.4 CLEANING............................................................................................................................................... 19
4. BLOCK DIAGRAM.......................................................................................................................................... 20
4.1 OVERALL CONNECTION DIAGRAM...................................................................................................... 20
B 4.2 BLOCK DIAGRAM ................................................................................................................................... 22
5. DIAGNOSIS.................................................................................................................................................... 31
5.1 OPERATIONAL FLOWCHART ................................................................................................................ 31
5.2 INSPECTION METHOD OF PICKUP UNIT............................................................................................. 32
5.3 DIAGNOSIS FLOWCHART ..................................................................................................................... 35
5.4 ERROR CODE LIST ................................................................................................................................ 53
5.5 CONNECTOR FUNCTION DESCRIPTION ............................................................................................. 56
5.6 MECHANICAL DESCRIPTION ................................................................................................................ 57
6. SERVICE MODE ............................................................................................................................................ 62
6.1 DVD TEST MODE ................................................................................................................................... 62
6.2 MONITOR TEST MODE .......................................................................................................................... 71
7. DISASSEMBLY .............................................................................................................................................. 84
C
8. EACH SETTING AND ADJUSTMENT ........................................................................................................... 96
8.1 DVD ADJUSTMENT ................................................................................................................................ 96
8.2 PCL OUTPUT CONFIRMATION............................................................................................................ 101
9. EXPLODED VIEWS AND PARTS LIST........................................................................................................ 102
9.1 PACKING ............................................................................................................................................... 102
9.2 EXTERIOR (1) ....................................................................................................................................... 106
9.3 EXTERIOR (2) ....................................................................................................................................... 108
9.4 EXTERIOR (3) ........................................................................................................................................110
9.5 EXTERIOR (4) ........................................................................................................................................112
9.6 DVD MECHANISM MODULE .................................................................................................................116
10. SCHEMATIC DIAGRAM..............................................................................................................................118
D 10.1 DVD AMP UNIT (IF BLOCK).................................................................................................................118
10.2 DVD AMP UNIT (AMP BLOCK) ........................................................................................................... 120
10.3 DVD AMP UNIT (POWER SUPPLY BLOCK) ...................................................................................... 122
10.4 DVD AMP UNIT (SYSTEM BLOCK) (GUIDE PAGE) .......................................................................... 124
10.5 DVD AMP UNIT (E-VOL BLOCK) ........................................................................................................ 130
10.6 DVD AMP UNIT (AVSEL BLOCK) ....................................................................................................... 132
10.7 DVD AMP UNIT (IN/OUT BLOCK)....................................................................................................... 134
10.8 DVD AMP UNIT (BT/OUT BLOCK)...................................................................................................... 136
10.9 DVD AMP UNIT (TUNER BLOCK) ...................................................................................................... 138
10.10 KEYBOARD UNIT.............................................................................................................................. 140
10.11 DVD CORE UNIT (MS7.1) (GUIDE PAGE)........................................................................................ 142
10.12 COMPOUND UNIT(A) and COMPOUND UNIT(B) ............................................................................ 148
E 10.13 MONITOR UNIT (LCD/IF BLOCK) (GUIDE PAGE) ........................................................................... 150
10.14 MONITOR UNIT (SH BLOCK) (GUIDE PAGE).................................................................................. 156
10.15 MONITOR UNIT (BL_POWER BLOCK) ............................................................................................ 162
10.16 MONITOR UNIT (LCD_POWER BLOCK) ......................................................................................... 164
10.17 MAIN PCB UNIT and SW PCB UNIT................................................................................................. 166
10.18 WAVEFORMS .................................................................................................................................... 168
11. PCB CONNECTION DIAGRAM.................................................................................................................. 170
11.1 DVD AMP UNIT.................................................................................................................................... 170
11.2 DVD CORE UNIT (MS7.1) ................................................................................................................... 174
11.3 KEYBOARD UNIT ................................................................................................................................ 178
11.4 COMPOUND UNIT(A) and COMPOUND UNIT(B) .............................................................................. 179
11.5 MONITOR UNIT ................................................................................................................................... 180
F
11.6 MAIN PCB UNIT................................................................................................................................... 184
11.7 SW PCB UNIT...................................................................................................................................... 185
12. ELECTRICAL PARTS LIST ........................................................................................................................ 186

AVH-X7500BT/XNUC
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1. SERVICE PRECAUTIONS
1.1 SERVICE PRECAUTIONS
A

1. You should conform to the regulations governing the product (safety, radio and noise, and other regulations),
and should keep the safety during servicing by following the safety instructions described in this manual.
2. Be careful in handling ICs. Some ICs such as MOS type are so fragile that they can be damaged by electrostatic
induction.
3. Before disassembling the unit, be sure to turn off the power. Unplugging and plugging the connectors during
power-on mode may damage the ICs inside the unit.
4. To protect the pickup unit from electrostatic discharge during servicing, take an appropriate treatment
(shorting-solder) by referring to "the DISASSEMBLY" .
5. After replacing the pickup unit, be sure to skew adjustment.
6. When a flash ROM needs to be replaced by service, do not replace an IC but a core unit (as no encryption key is
B
written in a flash alone).
7. During disassembly, be sure to turn the power off since an internal IC might be destroyed when a connector
is plugged or unplugged.
8. EJECT LOCK MODE for DVD mechanism
How to enter : Turn on ACC while pressing [HOME] and [EJECT] keys together.
How to exit : Same procedure to enter this mode.
9. area and a heat sink becomes hot areas. Be careful not to burn yourself.

AVH-X7500BT/XNUC
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A 10. The following area becomes hot areas. Be careful not to burn yourself.
DVD AMP UNIT
IC1101 SIDE A

C1108
P-IC Holder

C1110
C1111
C1212
C1209
B
D1215

IC1801

DVD AMP UNIT
SIDE B

C
IC1451
D1216 IC1203
IC1210

IC1202

IC1206

IC1205
D

DVD MECHANISM MODULE
IC1501

Note:
the photograph shown is slightly different from this model in shape.

AVH-X7500BT/XNUC
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1.2 NOTES ON SOLDERING

For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for repairs
accompanied by reworking of soldering.

Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 C.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 C in general, although
the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of
the soldering iron.

Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting
temperatures (hard to melt/easy to harden).
B

The following lead-free solders are available as service parts:
Parts numbers of lead-free solder:
GYP1006 1.0 in dia.
GYP1007 0.6 in dia.
GYP1008 0.3 in dia.

AVH-X7500BT/XNUC
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2. SPECIFICATIONS
2.1 SPECIFICATIONS
A

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