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CDX-GT828U/GT870US/
GT878US
SERVICE MANUAL AEP Model
UK Model
Ver. 1.0 2007.12 CDX-GT828U

E Model
CDX-GT870US/GT878US

Photo: CDX-GT828U

· The tuner and CD sections have no adjustments.
CDX-GT620U/670U/
Model Name Using Similar Mechanism
GT670US
CD Drive Mechanism Type MG-101I-188//Q
Optical Pick-up Name DAX-25A

SPECIFICATIONS
CD Player section MW/LW AM
Signal-to-noise ratio: 120 dB CDX-GT828U: CDX-GT870US/GT878US:
Frequency response: 10 20,000 Hz Tuning range: Tuning range:
Wow and flutter: Below measurable limit MW: 531 1,602 kHz 531 1,602 kHz (at 9 kHz step)
LW: 153 279 kHz 530 1,710 kHz (at 10 kHz step)
Tuner section Antenna (aerial) terminal: AM tuning interval:
FM External antenna (aerial) connector 9 kHz/10 kHz switchable
Tuning range: Intermediate frequency: Antenna (aerial) terminal:
CDX-GT828U: 10.7 MHz/450 kHz External antenna (aerial) connector
87.5 108.0 MHz Sensitivity: Intermediate frequency: 10.7 MHz/450 kHz
CDX-GT870US/GT878US: MW: 30 V, LW: 40 V Sensitivity: 30 V
87.5 108.0 MHz (at 50 kHz step)
Continued on next page
87.5 107.9 MHz (at 200 kHz step)
FM tuning interval:
CDX-GT870US/GT878US:
50 kHz/200 kHz switchable
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio:
67 dB (stereo), 69 dB (mono)
Harmonic distortion at 1 kHz:
0.5 % (stereo), 0.3 % (mono)
Separation: 35 dB at 1 kHz

FM/MW/LW COMPACT DISC PLAYER
Frequency response: 30 15,000 Hz

CDX-GT828U
FM/AM COMPACT DISC PLAYER
CDX-GT870US/GT878US

9-887-933-01 Sony Corporation
2007L04-1 Audio Business Group
© 2007.12 Published by Sony Techno Create Corporation
CDX-GT828U/GT870US/GT878US

USB Player section SERVICE NOTES
Interface: USB (Full-speed)
Maximum current: 500mA
NOTES ON HANDLING THE OPTICAL PICK-UP
Power amplifier section BLOCK OR BASE UNIT
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 8 ohms The laser diode in the optical pick-up block may suffer electrostat-
Maximum power output: 52 W × 4 (at 4 ohms) ic break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
General During repair, pay attention to electrostatic break-down and also
Output: use the procedure in the printed matter which is included in the
Audio outputs terminal (front/rear) repair parts.
Subwoofer output terminal (mono)
The flexible board is easily damaged and should be handled with
Power antenna (aerial) relay control terminal
Power amplifier control terminal care.
Inputs:
Telephone ATT control terminal NOTES ON LASER DIODE EMISSION CHECK
Illumination control terminal The laser beam on this model is concentrated so as to be focused
Bus control input terminal on the disc reflective surface by the objective lens in the optical
Bus audio input terminal pickup block. Therefore, when checking the laser diode emission,
Remote controller input terminal
observe from more than 30 cm away from the objective lens.
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
USB signal input terminal Notes on chip component replacement
· Never reuse a disconnected chip component.
Tone controls: · Notice that the minus side of a tantalum capacitor may be dam-
Low: ±10 dB at 60 Hz (XPLOD) aged by heat.
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)
Power requirements: 12 V DC car battery TEST DISCS
(negative ground (earth)) Please use the following test discs for the check on the CD section.
Dimensions: Approx. 178 × 50 × 180 mm (w/h/d)
Mounting dimensions: Approx. 182 × 53 × 162 mm (w/h/d) YDES-18 (Part No. 3-702-101-01)
Mass: Approx. 1.2 kg PATD-012 (Part No. 4-225-203-01)
Supplied accessories:
Card remote commander: RM-X154 (CDX-GT828U)
RM-X156 (CDX-GT870US/GT878US) CAUTION
Parts for installation and connections (1 set) Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
US and foreign patents licensed from Dolby Laboratories.
MPEG Layer-3 audio coding technology and patents licensed from Fraun-
If the optical pick-up block is defective, please replace the whole
hofer IIS and Thomson.
This product is protected by certain intellectual property rights of Micro- optical pick-up block.
soft Corporation. Use or distribution of such technology outside of this Never turn the semi-fixed resistor located at the side of optical
product is prohibited without a license from Microsoft or an authorized pick-up block.
Microsoft subsidiary.
optical pick-up
Design and specifications are subject to change
without notice.

SAFETY-RELATED COMPONET WARNING! semi-fixed resistor
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

2
CDX-GT828U/GT870US/GT878US

This compact disc player is classified as a CLASS 1 LASER TABLE OF CONTENTS
product. The CLASS 1 LASER PRODUCT label is located on the
exterior. 1. SERVICE NOTE ..................................................... 4

2. GENERAL
Location of Controls ....................................................... 5
Connections .................................................................... 6

This label is located on the bottom of the chassis. 3. DISASSEMBLY
3-1. Sub Panel Assy ............................................................... 9
· CD playback
3-2. CD Mechanism Block ..................................................... 9
You can play CD-DA (also containing CD TEXT), CD-R/CD-
3-3. Main Board ..................................................................... 10
RW (MP3/WMA/AAC files).
3-4. Servo Board .................................................................... 10
Type of discs Label on the disc 3-5. Chassis (T) Sub Assy ...................................................... 11
3-6. Roller Arm Assy.............................................................. 11
3-7. Chassis (OP) Assy ........................................................... 12
CD-DA
3-8. Chucking Arm Sub Assy ................................................. 12
3-9. Sled Motor Assy.............................................................. 13
3-10. Optical Pick-up Section .................................................. 14
3-11. Optical Pick-up ............................................................... 14
MP3
WMA
4. DIAGNOSIS FUNCTION ..................................... 15
AAC
5. DIAGRAMS
5-1. Block Diagram Main Section ..................................... 19
UNLEADED SOLDER 5-2. Block Diagram Display Section ................................. 20
Boards requiring use of unleaded solder are printed with the lead- 5-3. Printed Wiring Board Main Section (1/2) ................... 22
free mark (LF) indicating the solder contains no lead. 5-4. Printed Wiring Board Main Section (2/2) ................... 23
(Caution: Some printed circuit boards may not come printed with 5-5. Schematic Diagram Main Section (1/4)...................... 24
the lead free mark due to their particular size) 5-6. Schematic Diagram Main Section (2/4)...................... 25
5-7. Schematic Diagram Main Section (3/4)...................... 26
: LEAD FREE MARK 5-8. Schematic Diagram Main Section (4/4)...................... 27
Unleaded solder has the following characteristics. 5-9. Printed Wiring Board Sub Section- .............................. 28
· Unleaded solder melts at a temperature about 40 °C higher 5-10. Schematic Diagram Sub Section- ................................. 29
than ordinary solder. 5-11. Printed Wiring Boards Key Section ........................... 30
Ordinary soldering irons can be used but the iron tip has to be 5-12. Schematic Diagram Key Section ............................... 31
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to 6. EXPLODED VIEWS
about 350 °C. 6-1. Main Section ................................................................... 38
Caution: The printed pattern (copper foil) may peel away if the 6-2. Front Panel Section ......................................................... 39
heated tip is applied for too long, so be careful! 6-3. CD Mechanism Section (MG-101I-188//Q) ................... 40
· Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) 7. ELECTRICAL PARTS LIST .............................. 41
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
· Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

3
CDX-GT828U/GT870US/GT878US
SECTION 1
SERVICE NOTE
EXTENSION CABLE AND SERVICE POSITION NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing or servicing this set, connect the jig (extension When repairing, the complete SERVO board (A-1362-921-A)
cable) as shown below. should be replaced since any parts in the SERVO board cannot be
repaired.
· Connect the MAIN board (CN350) and the SERVO board
(CN401) with the extension cable (Part No. J-2502-076-1).

MAIN BOARD
CN350 J-2502-076-1

SERVO BOARD
CN401

NOTE FOR REPLACEMENT OF THE USB CONNECTOR NOTE FOR THE 24-PIN CONNECTOR (CN901)
(CN902) Do not use alcohol to clean the 24-pin connector (CN901) connect-
To replace the USB connector requires alignment. ing the front panel with the main body.
1. Insert the USB connector into the front panel. Do not touch the connector directly with your bare hand. Poor con-
2. Place the KEY board on the front panel and align the terminals tact may be caused.
of the USB connector with the holes in the KEY board.
3. Solder the four terminals of the connector.

KEY board

USB (socket) connector

front panel

4
CDX-GT828U/GT870US/GT878US
SECTION 2
GENERAL This section is extracted
from instruction manual.

· Location of Controls
· CDX-GT828U:

Location of controls and basic operations
Main unit SOURCE button RESET button page 5
To power on; change the source (Radio/CD/
USB/AUX)*. (eject) button page 7
To eject the disc.
Display window
OPEN
Disc slot page 7
OFF LIST/
BROWSE USB terminal page 15 To insert the disc.
SOURCE To connect to the USB device.
SEEK SEEK The following buttons on the card remote
OPEN button page 6, 7 commander have also different buttons/functions
from the unit. Remove the insulation film before
BACK (BACK) button page 10 use (page 5).
MODE AUX
PTY REP SHUF ALBUM DM PAUSE SCRL
To return to the previous display.
PUSH ENTER/SOUND/MENU
AF/TA 1 2 3 4 5 6 DSPL MENU button
Receptor for the card remote To enter menu.
commander
ENTER button
SEEK /+ buttons To apply a setting.
Front panel removed CD/USB:
To skip tracks (press); skip tracks ( )/ ( ) buttons
continuously (press, then press again within To control CD/radio/USB, the same as
about 1 second and hold); reverse/fast- /+ on the unit.
forward a track (press and hold). Setup, sound setting, etc., can be operated by
Radio: .
To tune in stations automatically (press); find DSPL (Display)/PTY (Program Type)
a station manually (press and hold). button
MODE button page 12, 15 To change display items/select PTY in RDS.
To select the radio band (FM/MW/LW); select VOL (volume) +/ button
the play mode of ATRAC Audio Device.
RESET
To adjust volume.
AF (Alternative Frequencies)/
ATT (attenuate) button
TA (Traffic Announcement)/
To attenuate the sound. To cancel, press
PTY (Program Type) button page 13, 14 again.
Card remote commander This section contains instructions on the location To set AF and TA (press); select PTY (press
of controls and basic operations. For details, see and hold) in RDS. SOUND button
RM-X154 the respective pages. To enter sound setting.
Number buttons
For USB device operation, see "USB devices" on LIST button
CD/USB:
page 15, or for optional device (CD/MD changer,
OFF ATT : REP page 12, 15 To list up (Radio); enter the Quick-BrowZer
etc.) operation, see "Using optional equipment"
: SHUF page 12, 15 mode(CD/USB).
on page 18.
SOURCE SOUND MODE / : ALBUM /+
The corresponding buttons on the card remote (+)/ () buttons
To skip albums (press); skip albums
MENU LIST
commander control the same functions as those To control CD/USB, the same as /
continuously (press and hold).
on the unit. (ALBUM /+) on the unit.
+ : DM+ page 4
OFF button To activate the DM+ function, set Setup, sound setting, etc., can be operated by
ENTER
"DM+ on." To cancel, set "DM+ off." .

To power off; stop the source.
: PAUSE SCRL (scroll) button
(LIST/BROWSE) button page 10, To pause playback. To cancel, press again.
DSPL/PTY SCRL To scroll the display item.
REP SHUF 13 Radio:
1 2 3
To list up (Radio); enter the Quick-BrowZer To receive stored stations (press); store * In the case of a CD/MD changer being connected;
PAUSE
mode (CD/USB). stations (press and hold). when is pressed, the connected device
4 5 6
("MD") will appear in the display, depending on
Control dial/select button DSPL (display)/SCRL (scroll) button which device is connected. Furthermore, if
+ Rotate to: Adjust volume. page 12 is pressed, you can switch the changer.
VOL
Press to: Enter sound setting/apply a menu To change display items (press); scroll the Notes
setting. display item (press and hold). · When ejecting/inserting a disc, keep any USB
Press and hold to: Enter menu. devices disconnected to avoid damage to the disc.
AUX input jack page 18 · If the unit is turned off and the display disappears, it
To connect a portable audio device. cannot be operated with the card remote
8 commander unless on the unit is
pressed, or a disc is inserted to activate the unit first.
9

· CDX-GT870US/GT878US:

Location of controls and basic operations
Main unit SOURCE button RESET button page 5
To power on; change the source (Radio/CD/
USB/AUX)*. (eject) button page 7
To eject the disc.
Display window
OPEN
Disc slot page 7
OFF LIST/
BROWSE USB terminal page 13 To insert the disc.
SOURCE To connect to the USB device.
SEEK SEEK The following buttons on the card remote
OPEN button page 6, 7 commander have also different buttons/functions
from the unit. Remove the insulation film before
BACK (BACK) button page 10 use (page 5).
MODE AUX
REP SHUF ALBUM DM PAUSE
To return to the previous display.
PUSH ENTER/SOUND/MENU
SCRL 1 2 3 4 5 6 DSPL MENU button
Receptor for the card remote To enter menu.
commander
ENTER button
SEEK /+ buttons To apply a setting.
Front panel removed CD/USB:
To skip tracks (press); skip tracks ( )/ ( ) buttons
continuously (press, then press again within To control CD/radio/USB, the same as
about 1 second and hold); reverse/fast- /+ on the unit.
forward a track (press and hold). Setup, sound setting, etc., can be operated by
Radio: .
To tune in stations automatically (press); find VOL (volume) +/ button
a station manually (press and hold). To adjust volume.
MODE button page 12, 14 ATT (attenuate) button
To select the radio band (FM/AM)*; select To attenuate the sound. To cancel, press
the play mode of ATRAC Audio Device. again.
RESET
SCRL (scroll) button SOUND button
To scroll the display item. To enter sound setting.
Frequency select switch (located on the LIST button
Card remote commander This section contains instructions on the location bottom of the unit) To list up (Radio); enter the Quick-BrowZer
of controls and basic operations. For details, see See "Frequency select switch" in the
RM-X156 the respective pages. mode (CD/USB).
supplied installation/connections manual.
For USB device operation, see "USB devices" on (+)/ () buttons
OFF ATT
page 13, or for optional device (CD/MD changer, Number buttons To control CD/USB, the same as /
etc.) operation, see "Using optional equipment" CD/USB: (ALBUM /+) on the unit.
SOURCE SOUND MODE
on page 17. : REP page 12, 14 Setup, sound setting, etc., can be operated by
The corresponding buttons on the card remote : SHUF page 12, 14 .
MENU LIST commander control the same functions as those / : ALBUM /+
on the unit. To skip albums (press); skip albums * In the case of a CD/MD changer being connected;
+
continuously (press and hold). is pressed, the connected device
ENTER OFF button : DM+ page 4 ("MD") will appear in the display, depending on
To power off; stop the source. which device is connected. Furthermore, if
To activate the DM+ function, set is pressed, you can switch the changer.
(LIST/BROWSE) button page 10, "DM+ on." To cancel, set "DM+ off."
DSPL SCRL Notes
13 PAUSE
REP SHUF · When ejecting/inserting a disc, keep any USB
1 3
To list up (Radio); enter the Quick-BrowZer To pause playback. To cancel, press devices disconnected to avoid damage to the disc.
PAUSE
mode (CD/USB). again. · If the unit is turned off and the display disappears, it
4 6
Radio: cannot be operated with the card remote
Control dial/select button To receive stored stations (press); store commander unless on the unit is
+ Rotate to: Adjust volume. stations (press and hold). pressed, or a disc is inserted to activate the unit first.
VOL
Press to: Enter sound setting/apply a menu DSPL (display) button page 12
setting.
Press and hold to: Enter menu. To change display items.
AUX input jack page 17
8 To connect a portable audio device.
9

5
CDX-GT828U/GT870US/GT878US

· Connections
· CDX-GT828U:
*1 Note for the antenna (aerial) connecting *1 Hinweis zum Anschließen der Antenne *1 Remarque sur le raccordement de *1 Nota per il collegamento dell'antenna *1 Opmerking bij de antenne-aansluiting
If your car antenna (aerial) is an Wenn Ihre Fahrzeugantenne der l'antenne Se l'antenna dell'auto è di tipo Indien uw auto is uitgerust met een
ISO (International Organization for ISO-Norm (ISO = International Si votre antenne de voiture est de type ISO (International Organization for antenne van het type ISO (International
Standardization) type, use the supplied Organization for Standardization ISO (Organisation internationale de Standardization), utilizzare l'adattatore Organization for Standardization),
*2 adaptor to connect it. First connect - Internationale Normungsgemeinschaft) normalisation), utilisez l'adaptateur fourni in dotazione per collegarla. Collegare moet u die aansluiten met behulp
the car antenna (aerial) to the supplied entspricht, schließen Sie sie mithilfe des pour la raccorder. Raccordez d'abord prima l'antenna della macchina van de bijgeleverde adapter . Sluit
adaptor, then connect it to the antenna mitgelieferten Adapters an. Verbinden l'antenne de voiture à l'adaptateur fourni all'adattatore in dotazione, quindi eerst de auto-antenne aan op de
(aerial) jack of the master unit. Sie zuerst die Fahrzeugantenne mit dem et, ensuite, à la prise d'antenne de collegarla alla presa dell'antenna bijgeleverde adapter en vervolgens de
*2 RCA pin cord (not supplied) mitgelieferten Adapter und verbinden Sie l'appareil principal. dell'apparecchio principale. antennestekker op het hoofdtoestel.
*3 Insert with the cord upwards. diesen dann mit der Antennenbuchse *2 Cordon à broche RCA (non fourni) *2 Cavo a piedini RCA (non in dotazione) *2 Tulpstekkersnoer (niet bijgeleverd)
*4 Supplied with XA-C40 des Hauptgeräts. *3 Insérez avec le câble vers le haut. *3 Inserire con il cavo rivolto verso l'alto. *3 Plaatsen met het snoer naar boven.
*2 Cinchkabel (nicht mitgeliefert) *4 Fourni avec le XA-C40 *4 In dotazione con il modello XA-C40 *4 Geleverd met de XA-C40
*3 Mit dem Kabel nach oben einsetzen.
*4 Mit dem XA-C40 geliefert
*2

*4
BUS AUDIO IN FRONT REMOTE
* 2 AUDIO OUT IN

*3
L Source selector
(not supplied)
R Signalquellenwähler
SUB OUT (MONO) BUS REAR FRONT (nicht mitgeliefert)
IN AUDIO OUT
Sélecteur de source Supplied with the CD/MD changer
* 1
from car antenna (aerial) (non fourni) Mit dem CD/MD-Wechsler geliefert
von Autoantenne BUS Selettore di fonte Fourni avec le changeur de CD/MD
Fuse (10 A)
de l'antenne de la voiture REAR CONTROL IN (non in dotazione) In dotazione con il cambia CD/MD
Sicherung (10 A)
dall'antenna dell'auto AUDIO OUT Geluidsbronkiezer Geleverd met de CD/MD-wisselaar
Fusible (10 A)
van een auto-antenne (niet bijgeleverd)
Fusibile (10 A)
Zekering (10 A)
XA-C40
Max. supply current 0.3 A Blue/white striped *4
max. Versorgungsstrom 0,3 A Blauweiß gestreift 1 3 5 7
Courant d'alimentation maximum 0,3 A Rayé bleu/blanc
Alimentazione massima fornita 0,3 A Rigato blu e bianco from the car's speaker connector
Max. voedingsstroom 0,3 A AMP REM Blauw/wit gestreept vom Lautsprecheranschluss des Fahrzeugs
du connecteur de haut-parleur de la voiture
dal connettore del diffusore dell'auto
van de autoluidsprekerstekker

Light blue
2 4 6 8
Hellblau 5 7 Speaker, Rear, Right Speaker, Front, Left
Bleu ciel Lautsprecher hinten rechts Lautsprecher vorne links
Azzurro from the car's power connector
vom Stromanschluss des Fahrzeugs 1 + Haut-parleur, arrière, droit 5 + Haut-parleur, avant, gauche