Pioneer AVH-280BT/XNUC User manual

ORDER NO.
PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 2 Jalan Kilang Barat, #07-01, Singapore 159346
PIONEER CORPORATION 2015
AVH-280BT/XNUC
CRT5859
DVD RDS AV RECEIVER
AVH-280BT/XNUC
AVH-280BT/XNEU5
AVH-285BT/XNRC
AVH-285BT/XNRD
AVH-285BT/XNRI
AVH-289BT/XNID
This service manual should be used together with the following manual(s):
Model No. Order No. Mech.Module Remarks
CX-3311 CRT5651 LS2.5 DVD Mech. Module : Circuit Descriptions, Mech. Descriptions, Disassembly,
Diagnosis , Each Setting and Adjustment
K-ZZZ DEC. 2015 Printed in Japan

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SAFETY INFORMATION
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:
CAUTION:
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
-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.
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.
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.
CAUTION
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
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
harm.
Health & Safety Code Section 25249.6 - Proposition 65

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

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CONTENTS
SAFETY INFORMATION..................................................................................................................................... 2
1. SERVICE PRECAUTIONS ............................................................................................................................... 5
1.1 SERVICE PRECAUTIONS......................................................................................................................... 5
1.2 NOTES ON DISASSEMBLY / ASSEMBLY................................................................................................. 6
1.3 NOTES ON OPERATION CHECK / DIAGNOSIS ...................................................................................... 7
1.4 NOTES ON REPLACING PARTS .............................................................................................................. 7
1.5 NOTES ON ADJUSTMENT ....................................................................................................................... 7
1.6 OTHERS .................................................................................................................................................... 7
2. SPECIFICATIONS ............................................................................................................................................ 8
2.1 SPECIFICATIONS...................................................................................................................................... 8
2.2 DISC/CONTENT FORMAT ........................................................................................................................ 8
3. BASIC ITEMS FOR SERVICE.......................................................................................................................... 9
3.1 CHECK POINTS AFTER SERVICING....................................................................................................... 9
3.2 PCB LOCATIONS .................................................................................................................................... 10
3.3 JIGS LIST ................................................................................................................................................ 11
3.4 CLEANING............................................................................................................................................... 11
4. BLOCK DIAGRAM.......................................................................................................................................... 12
4.1 OVERALL CONNECTION DIAGRAM...................................................................................................... 12
4.2 BLOCK DIAGRAM ................................................................................................................................... 13
4.3 POWER SUPPLY SYSTEM FIGURE....................................................................................................... 15
5. DIAGNOSIS.................................................................................................................................................... 18
5.1 OPERATIONAL FLOWCHART ................................................................................................................ 18
5.2 INSPECTION METHOD OF PICKUP UNIT............................................................................................. 19
5.3 ERROR CODE LIST ................................................................................................................................ 22
5.4 CONNECTOR FUNCTION DESCRIPTION ............................................................................................. 24
6. SERVICE MODE ............................................................................................................................................ 25
6.1 VERSION INFORMATION ....................................................................................................................... 25
6.2 SERVICE TEST MODE ........................................................................................................................... 25
6.3 FIRMWARE UPGRADE........................................................................................................................... 38
7. DISASSEMBLY............................................................................................................................................... 41
8. EACH SETTING AND ADJUSTMENT ........................................................................................................... 45
8.1 ADJUSTMENT REQUIRED WHEN HTE UNIT IS REPLACED............................................................... 45
8.2 FLICKER ADJUSTMENT......................................................................................................................... 46
9. EXPLODED VIEWS AND PARTS LIST.......................................................................................................... 47
9.1 PACKING ................................................................................................................................................. 47
9.2 EXTERIOR(1) .......................................................................................................................................... 50
9.3 EXTERIOR(2) .......................................................................................................................................... 52
9.4 DVD MECHANISM MODULE(1) .............................................................................................................. 54
9.5 DVD MECHANISM MODULE(2) .............................................................................................................. 56
10. SCHEMATIC DIAGRAM ............................................................................................................................... 57
10.1 MOTHER UNIT (SENSE)....................................................................................................................... 57
10.2 MOTHER UNIT (BT IF) .......................................................................................................................... 58
10.3 MOTHER UNIT (USB_POW) ................................................................................................................. 59
10.4 MOTHER UNIT (I/F)............................................................................................................................... 60
10.5 MOTHER UNIT (E.VOL) ........................................................................................................................ 61
10.6 MOTHER UNIT (DDC 2ch) .................................................................................................................... 62
10.7 MOTHER UNIT (TUNER) ...................................................................................................................... 63
10.8 MOTHER UNIT (PWIC) ......................................................................................................................... 64
10.9 MOTHER UNIT (ucom) .......................................................................................................................... 65
10.10 MOTHER UNIT (POWER) ................................................................................................................... 66
10.11 MOTHER UNIT (SOC) ......................................................................................................................... 67
10.12 MONITOR PCB (PCB_IF).................................................................................................................... 68
10.13 MONITOR PCB (LCD_BL)................................................................................................................... 69
10.14 MONITOR PCB (LCD_PW) ................................................................................................................. 70
10.15 MONITOR PCB(LCDI/F) ...................................................................................................................... 71
10.16 MONITOR PCB(TCON) ....................................................................................................................... 72
10.17 MONITOR PCB(ISO) ........................................................................................................................... 73
10.18 RELAY UNIT ........................................................................................................................................ 74
10.19 KEY PCB ............................................................................................................................................. 75
10.20 WAVEFORMS ...................................................................................................................................... 76
11. PCB CONNECTION DIAGRAM ................................................................................................................... 78
11.1 MOTHER UNIT ...................................................................................................................................... 78
11.2 MONITOR PCB...................................................................................................................................... 80
11.3 RELAY UNIT .......................................................................................................................................... 82
11.4 KEY PCB ............................................................................................................................................... 84
12. ELECTRICAL PARTS LIST .......................................................................................................................... 85

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1. SERVICE PRECAUTIONS
1.1 SERVICE PRECAUTIONS
MOTHER PCB (Side A) MOTHER PCB (Side B)
IC1301
L902
C1319
IC111
IC741
IC1201
IC861
IC601
DVD Mechanism Module Top Case
Rear Holder
Heat Sink
1F & 2F
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.
Please keep the distance of more than 13 cm from focus lens for safety when you check pickup and make adjustment,
and do not look straight at Laser Beam for more than 10 seconds.
area and a heat sink becomes hot areas. Be careful not to burn yourself.

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1.2 NOTES ON DISASSEMBLY / ASSEMBLY
Confirm the shorting-solder.
Remove the flexible flat cable.
Shorting-solder land
for CD
Shorting-solder land
for DVD
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.
Please be sure to conduct line process to original status if you make assembling after repair.
The shorting-solder protects the laser diode (LD) from the static electricity. When replacing the DVD Mechanism
Module, please take an appropriate treatment (shorting-solder) by referring to the procedure below.
1. Procedure for removing the DVD Mechanism Module of the product
(1) To protect the LD, short-circuit the solder while the Mechanism Module remains connected to the product.
Short-circuit the solder to be ready to remove
the DVD Mechanism Module.
Confirm that the Mechanism Module
is connected to the product.
(2) After confirming the shorting-solder has been done securely, remove the DVD Mechanism Module of the product.
2. Procedure for connecting the DVD Mechanism Module to the product
For the Mechanism Module which is provided as service part, the shorting-solder has been done to protect the LD.
When replacing the Mechanism Module, please connect it to the product at first and then
remove the shorting-solder in reverse order of the previous procedure for removing.
Check the location for the shorting-solder.

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1.3 NOTES ON OPERATION CHECK / DIAGNOSIS
1.4 NOTES ON REPLACING PARTS
1.5 NOTES ON ADJUSTMENT
1.6 OTHERS
EJECT LOCK MODE for DVD mechanism
< Procedure >
To enter EJECT LOCK MODE : Reset start while pressing [VOL+] key and [REVERSE] key.
To exit EJECT LOCK MODE : Follow the same steps to enter this mode.
Notes for the memory backup
B.UP OFF or pressing [RESET] key stores the settings (i.e. EQ curve).
To delete the settings completely, you need to clear the settings using the Restore Setting menu in SYSTEM Setting.
Be careful in handling ICs. Some ICs such as MOS type are so fragile that they can be damaged by electrostatic
induction.
Please be careful of not to apply static charge onto integrated circuits, etc, when you conduct repair work.
Especially, please use soldering iron with its tip grounded.
Also, please use a pair of tweezers with static charge protection capability if there is the possibility of contacting to
device terminals, and avoid the use of metal-made tweezers.
The part listed below is difficult to replace as a discrete component part.
When the part listed in the table is defective, replace whole Assy.
On this mechanism, Pickup and Spindle Motor can not be replaced at the Service Site, because a special facility is
required for the adjustment after replacing them.
So, if Pickup or Spindle Motor is defective, replace the DVD Mechanism Module.
The skew adjustment and LD power adjustment for the DVD Mechanism Module have already finished, so you cannot
replace its Pickup unit or board unit separately.
Unit No. Part No. Reason
Mother PCB IC2201 TEF6686HN Heat pad
IC401 MN103LF15RXW Blank IC
Service Unit(Monitor) IC5101 OZ527ILN Heat pad
IC5201 R1290K103A Heat pad
Some of the adjustment is required when the part is replaced.
Pease refer to “8.1 ADJUSTMENT REQUIRED WHEN THE UNIT IS REPLACED”.
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.
Notes on soldring

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2. SPECIFICATIONS
2.1 SPECIFICATIONS
2.2 DISC/CONTENT FORMAT
For all itemsexceptthebackup current, refer to theOwner'sManual.
Backup current......................... 5.0 mA or less
is a trademark of DVD Format/Logo Licensing Corporation.

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3. BASIC ITEMS FOR SERVICE
3.1 CHECK POINTS AFTER SERVICING
To keep the product quality after servicing, please confirm following check points.
No. Procedures Item to be confirmed
1 Confirm whether the customer complain has
been solved.
If the customer complain occurs with the
specific media, use it for the operation check.
The customer complain must not be
reappeared.
Display, video, audio and operations must be
normal.
2 DVD Measure playback error rates at the
innermost and outermost tracks by using the
test mode with the following disc.
DVD test disc (TDV-582)
Deterioration of mecha-drive can be
checked.
The error rate must be less than the
threshold value.
(Refer to the chapter of DIAGNOSIS for the
threshold value.)
3 DVD Play back a DVD.
(Menu operation; Title/chapter search)
Display, video, audio and operations must be
normal.
4 CD Play back a CD.
(Track search)
Display, audio and operations must be
normal.
5 FM/AM tuner Check FM/AM tuner action.
(Seek, Preset)
Switch band to check both FM and AM.
Display, audio and operations must be
normal. * If the reception sensitivity is poorer
than normal, the gasket on the FM/AM tuner
unit may be damaged or lost.
6 Check whether no disc is inside the product. The media used for the operating check must
be ejected.
7 Appearance check No scratches or dirt on its appearance after
receiving it for service.
For check items concerning image and voice, please refer to the followings:
Check items concerning image Check items concerning voice
Block-noise Distortion
Crosscut noise Noise
Dot noise Low volume
Distorted image (Image skip) High volume
Low brightness Changes in level
Too bright Pause of sound
Color fading
Partial discoloration

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3.2 PCB LOCATIONS
D
Key PCB
B
Monitor PCB
A
Mother Unit
C
Relay Unit
A:AVH-280BT/XNUC
B:AVH-280BT/XNEU5
C:AVH-285BT/XNRC
D:AVH-285BT/XNRD
E:AVH-285BT/XNRI
F:AVH-289BT/XNID
Unit Name : Mother Unit
Unit Number : QWM4221(A)
Unit Number : QWM4220(B)
Unit Number : QWM4223(C)
Unit Number : QWM4224(D)
Unit Number : QWM4225(E)
Unit Number : QWM4226(F)
Monitor Key Unit
Consists of
Monitor PCB
Key PCB
Unit Name : Monitor Key Unit
Unit Number : QWM4236(A,C,D,E,F)
Unit Number : QWM4234(B)
Unit Name : Relay Unit (NSP)

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3.3 JIGS LIST
3.4 CLEANING
-Grease List
-Jigs List
Name
Grease
Grease
Grease
Jig No.
GEM1024
GEM1045
GEM1043
Remarks
DVD Mechanism Module
DVD Mechanism Module
DVD Mechanism Modulet
Name Jig No. Remarks
GGV1025
(TDV-582)
Check points after servicing, Inspection method of Pickup UnitDisc(DVD-Video)
Disc(CD-DA) TCD-782 Inspection method of Pickup Unit
30P FFC GGD1222 RELAY UNIT <–> MOTHER UNIT
Before shipping out the product, be sure to clean the following portions by using the prescribed cleaning tools:
Portions to be cleaned Cleaning tools
DVD pickup lenses Cleaning liquid : GEM1004
Cleaning paper : GED-008

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4. BLOCK DIAGRAM 4.1 OVERALL CONNECTION DIAGRAM
JA3191 JA3151 JA3101 JA3161 JA3122
CN102
1
30
CN801
1
30
CN3201
1
60
JA901
1
18
1
12 13
24
CN5004 1
11
CN5301
1
60
JA2201
CN5003
1
60
CN5601
CN2901
1
11
JA3121
CN5002
1
2
CN5001
1
4
WIRED
REMOTE
RREOUT
AUX
VIDEO OUT
REAR VIEW
CAMERA
USB IF
FM/AM
ANT
POWER SUPPLY
WIRED REMOTE
BT MIC
TFT LCD MODULE
BACKLIGHT
BT MODULE
TOUCH PANEL
NM
Note: When ordering service parts, be sure to refer to " EXPLODED VIEWS AND PARTS LIST" or
"ELECTRICAL PARTS LIST".
4. BLOCK DIAGRM
AMOTHER UNIT
DDC 2ch
6/11
A
E.VOL
5/11
A
I/F
4/11
A
USB_POW
3/11
A
BT IF
2/11
A
SENSE
1/11
A
SOC
11/11
A
POWER
10/11
A
ucom
9/11
A
PWIC
8/11
A
TUNER
7/11
A
LCD_PW
3/6
B
LCD_BL
2/6
B
PCB_IF
1/6
B
ISO
6/6
B
TCON
5/6
B
LCDI/F
4/6
B
C
RELAY UNIT
BMONITOR PCB
D
KEY PCB

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4.2 BLOCK DIAGRAM
SYStoBT , BTtoSYS
Mute
Mute
USB5
Video SW
Video SW
BT
Mic
W.R
AUX
B.Camera
USB
REMKEY LED
AUXL,AUXR
SUN+L , SUN+R
5Vreg
RFVCC5
DD8
DD8
LECRGM
LECRGP
SPDLM
SPDLP
DD8
DD4.3
USB
D/D
VDD1.3
DVCC3.3
C.Video
Component
RCAout
Rear/S.W
RCAout
Front
SPout FL
SPout FR
SPout RR
SPout RL
B.Rem
VM6
V18
V92
ILMB
BSENS
ASENS
ISENS
BGSENS
PBSENS
ILMB
CPCLK
CPDATA
CPRST
CPPW
B.UP
B.UP
VDD3.3
B.UP
SYSB
B.UP
B.UP
P.B
B.G
ILM
ACC
B.UP
REAR V.OUT
LCD3.3
LCD1.8
LCD3.3
DVCC3.3
SCLK
SDAT
SYStoS+ , S+toSYS
MUTE
LCD3.3
CXK8200
LCD 6.2inch
CWX4348
DVCC3.3
DVCC3.3
BT_L , BT_R
VDD3.3
VDD3.3
SYS5
-SYSTEM BLOCK DIAGRAM
TUN
ANT
Tuner
IC2201
TEF6686HN
TUN3.3
TUN_SCL,TUN_SDA
TUNL,TUNR
BT Module
U2901
CWX4772
BT3.3 BT1.8
iPod CP
IC701
SOC
IC601
SPHE8202GQHL11P
Motor Driver
IC861
BA5839FP
IC741
SDRAM
Flash-ROM
IC721
µ-com
IC401
MN103LF15RXW
Flash-ROM
IC402
MX25L1606EM2I-12G
Power IC
IC1301
PA2032A
E-VOL
PM9012A
IC1201
T-Con
IC5402
TW8832SAT-
LB1-GRSH
Flash-ROM
IC5401
CWJ2031
LCD3.3
LCD POWER
IC5101
OZ527ILN
IC5101
R1290K103A
BACK LIGHT
AMOTHER UNIT
BMONITOR PCB
DKEY PCB

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-AUDIO VIDEO BLOCK DIAGRAM
AMOTHER UNIT
BMONITOR PCB
Power IC
IC1301
PA2032A
µ-com
IC401
MN103LF15RXW
RCA
Mute
RCA
Mute
AMP
Mute
E.VOL MUTE soft mute)
CH1
CH2 CH3
SAPPHIRE
CH5
CH6
Active
LPF
+4.2 B
TUNL,TUNR
BT_L , BT_R
V.Drive
IC1131
NJM41050V
V.Drive
IC1132
NJM41010F1
SUN+L , SUN+R
Component (Y/Cb/Cr)
RGB
888
ISO
IC1113
NJM2505AF
ISO
IC1111
NJM2505AF
ISO
IC1112
BH7673G
Active
LPF
LITHIO
USB_DM , USB_DP
AUXL,AUXR
C.Video
LCD
6.2 inch
CWX4348
Touch Panel
CSX1273
AUDIO
VIDEO
MUTE
E-VOL
PM9012A
IC1201
Tuner
IC2201
TEF6686HN
BT Module
U2901
CWX4772
SOC
IC601
SPHE8202GQHL11P
T-Con
IC5402
TW8832SAT-
LB1-GRSH

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4.3 POWER SUPPLY SYSTEM FIGURE
VF = 0.7V
+MN103LF14RXW
System µ-COM
24.0mA 48.0mA3.30V
EEPROM
S-93C66BD0I 3.30V - 1.5mA
55.0mA
4.8mA 8.0mA
8.0mA
5.00V 4.8mA
5.00V
8.40V 43.0mA
8.40V
5.00V
20.0mA
15.0mA
40.0mA
22.0mA
15.0mA
8.0mA
5.00V 4.8mA
5.00V 8.0mA
LPF(2x4 ch)
Video_SEL
SoC ISO(Composit)
B/C ISO(Composit)
E-VOL(SAPPHIRE)
PM9012A
NJM41050
NJM41010
NJM2505AF
NJM2505AF
5.00V 4.8mA 8.0mA
29.0mA5.00V
AUX ISO(Composit)
NJM41033
Video_SEL
H7673G
H7673G
23.0mA
ISO(Composit)
ISO(Compornent)
No Mount
B
B
typ
max
max
140.0mA
20.0mA20.0mA
140.0mA
197.6
OZ527 ILN
197.6 m A
mA
LCD BACK LIGHT
0.237
W
8.00V
9.60V
9.6V
LCD B.L
ILM
8.0V
rBLEN
rLEDEN
typ
max
LSCR523 UB
20.0
KEY_ILM SW
mA
20.0 m A
typ
3.3V VDD3.3
NJW4 181 U3-33B
24.0 m A
B.UP
VF =
min V
typ V
max V max
typ
max
LDO
DDC
SW
typ
max
typ
max
0.7V
470uF
0.675 W
3.3V
0.549 W
mA
W
10.8
14.4
15.1
0.250
49.5
W
8.0V SYSB
rSYSPW
8.0V NJW4 184 DL3-08A
63.0 m A
95.0 m A
0.403
typ
max
typ
max
61.0
0.112
5.0V mA
0.183
5.0V SY S5
MM185 6A50N-
W
37.4
mA
W
1.5A
8.0V
8.0V
KBUP KBUP DD8 DD8
21
Current
(Typ)
Voltage
(Typ)
Current
(Max)
AMOTHER UNIT
BMONITOR PCB

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+
typ
max
max
(Rush)1440.0mA
840.0mA
5.00V 140.0mA
PICK UP
8.10V 250.0mA
130.0mA
MOTER DRIVER
B
130.0 m A
mA
0.42 W
5.0V VCC5V
NJM2 886 DL3-05
3.30V 350.0mA
1.30V
MX25L
568.0mA
3.30V
155.0mA
100.0mA
SDRAM
75.0mA
364.0mA
A3V28S40JTP
Flash-ROM
3.30V 12.0mA
MEDIA(SUNPLUS)
30.0mA
A5839FP
140.0
5.0V
37S3959 3.30V 4.2mA
3206M
iPod CP
4.2mA
BT(SUNTEC)
X-8075 20.0mA 30.0mA3.30V
65.0mA 97.5mA1.80V
3
rVDCONT8
1258.6mA
1.4V
8.0V
VF =
4.3V
4.3V
typ
max
typ
max
VD4.3
typ
max
typ
max
rVDCONT5
3300uF
1125.3
AN330 12UA(2 /2)
4.3V
W
0.86
W
0.54
1791.8 m A
mA
8.0V
AN330 12UA(1 /2)
mA
0.56
1.65 W
W
1858.6
mA635.0
VD8
typ
max
typ
max
typ
max
typ
max
1.30V
mA
1.3V DVCC1.3
S-11 72B 33
441.2 m A
0.702 W
rSUNPWR33V
0.248 W
0.073 W
155.0
rSUNPWR125V
3.3V
702.2 m A
3.3V DVCC3.3
MM347 9A13
364.0 mA
0.441
W
typ
max
typ
max
MM341 1A33N
0.020
W
3.3V
4.3V 3.3V
30.0
20.0 m A
rBT18ON
4.3V
0.030
W
mA
typ
max
typ
max
0.163
W
mA
0.244
BT3.3
97.5 mA
1.8V
W
65.0
MM347 9A18
BT1 .8V1.8V
KBUP
DD8
DD4.3
KBUP
DD4.3
21
31
AMOTHER UNIT

AVH-280BT/XNUC 17
5678
5678
C D
F
A
B
E
+
3.30V 150.0mA 215.0mA
TEF6686HN
TUNER
18.00V 0.5mA
1.0mA
15.0mA
0.5mA
1.0mA
10.0mA3.30V
-
9.20V
-6.00V
6.0mA
9.20V - 10.0mA
30.0mA
9.20V
35.0mA
3.30V 30.0mA 45.0mA
1.80V 99.9mA 150.0mA
3.30V 1.2mA 1.5mA
1500.0mA5.00V 1000.0mA
GRADATION
COMDC
LCD MODULE
VDDG
AVDD
VEEG
DVDD
REMOTE IC
T-con
USB
typ
max
typ
max
153.0 m A
mA
R1290K10 3A
LCDPW
0.089
W
0.100
W
171.6
1.8V
typ
max
typ
max
1.8V LCD1.8V
MM357 1A18P
mA99.9
150.0 m A
0.15 W
0.23 W
rTUNO N
4.3V
rLCDPW
4.3V
3.3V
typ
max
typ W
max W
3.3V TUN3.3
0.15
0.22
MM357 1A33P
150.0 m A
215.0 m A
typ
max
typ
max
0.294 W
3.3V LCD3.3
MM347 9A33P
0.383 W
294.1 m A
383.1 m A
3.3V
typ
max
typ
max
100uF
5.0V USB5V
AN 330 14UA
1000.0 m A 5.0V
1500.0
rUSB CONT
mA
0.367 W
0.550 W
KBUPKBUP DD4.3
31
AMOTHER UNIT
BMONITOR PCB

AVH-280BT/XNUC
18
1234
1234
C
D
F
A
B
E
5. DIAGNOSIS
5.1 OPERATIONAL FLOWCHART
VDD50 : Pin 26, 68, 93
BSENS : Pin 124
ASENS : Pin 125
DDCCLK : Pin 73
VD5 : Pin 77
VD8 : Pin 78
SUNPWR33V : Pin 81
SUNPWR125V : Pin 79
LCDPW : Pin 111
SUNSTBY : Pin 31
VDD = 3.3V
BSENS
ASENS
DDCCLK Clock Out
( Frequency of 413.9kHz )
EN5 H
BSENS = L
Starts communication
with T-CON.
Source ON
Completes power_on operation.
(After that, proceedto each source operation)
Power ON
ASENS = L
EN8 H
SUNPWR33V H
SUNPWR125V H
LCDPW H
Starts communication
with SOC.
SYSPW H
SUNSTBY H

AVH-280BT/XNUC 19
5678
5678
C
D
F
A
B
E
5.2 INSPECTION METHOD OF PICKUP UNIT
START
Is it OK?
Ckeck parts
other than PICK UP
PICK UP
cleaned?
Perform lens
cleaning
LD current check
Yes
No
Check1
Check2
Disc to be used
CD-DA : TCD-782
DVD-Video : GGV1025 (TDV-582)
Exact judgment cannot be performed if the disk to be used has a crack and dirt.
Be careful of handling of a disk enough.
Execution method
Refer to the following page for the details of the check 1 and the check 2.
Finished
PU Lighting? Please perform the
usual diagnosis.
No
Is it OK? PICK UP
cleaned?
Perform lens
cleaning
Error rate check
Replace the
CRG chassis
Yes
Yes
Yes Yes
Yes
Yes
No
No No
No No
Replace the
CRG chassis
Replace the
CRG chassis
RF level check
Check2
Error rate check
Is it OK?
RF level check
Replace the
CRG chassis

AVH-280BT/XNUC
20
1234
1234
C
D
F
A
B
E
Check1 : LD current check
<Check>
Status: [Foucs closed] of TEST MODE
Notes: Please pay attention to the laser diode damage by static electricity.
Notes:
Since LD current value tends to raise according to deterioration, please refer to maximum value for diagnosis.
LD current should not be beyond the maximum value.
Check Point
REFVCC5_1 - DVDLD1
No.
1
Disc
GGV1025
Remarks: LD currentCriteria for voltage
REFVCC5_1 - CDLD12 TCD-782 45 mA (Ave)
60 mA (Max)
449 mV (Ave)
660 mV (Max)
50 mA (Ave)
65 mA (Max)
510 mV (Ave)
663 mV (Max)
Check PointNo. Disc
[CD]
[DVD]
Remarks: LD currentCriteria for voltage
CDLD1
REFVCC5_1
MOTHER UNIT (SIDE A)
REFVCC5_1
MOTHER UNIT (SIDE A)
DVDLD1