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DX-7555
SERVICE MANUAL
SERVICE MANUAL
COMPACT DISC PLAYER
Black, Silver and Golden models
MODEL
DX-7555
Ref. No. 3911
122005
/ 092006
230-240V AC, 50Hz
230-240V AC, 50Hz
220-230V AC, 50/60Hz
220-230V AC, 50/60Hz
120V AC, 60Hz
120V AC, 60Hz
120V AC, 60Hz
BMPP
SMPP
GMGT
GMGR
GMDT
BMDC
SMDC
RC-625C
ON
STANDBY
SEARCH
1
2
3
4
5
6
7
8
9
MEMORY
ENTER
DISPLAY
DIMMER
SETUP
RANDOM REPEAT
ENTER
OPEN/CLOSE
10
10/0
CLR
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.


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DX-7555
SPECIFICATIONS
Signal readout :
Frequency response :
SN ratio :
Audio dynamic range :
THD (total harmonic distortion) :
Audio output
Digital optical :
Audio output / Impedance
Digital coaxial :
Audio output / Impedance
Analog :
Power supply :
Power consumption :
Standby power consumption :
Dimensions (W x H x D) :
Weight :
Operation condition
Temperature, humidity :
Supported discs :
Optical non-contact
2 Hz - 20 kHz
111 dB
100 dB
0.0027%
-22.5 dBm
0.5 Vp-p, 75 ohm
2.0 V (rms), 470 ohm
AC 230 - 240 V, 50 Hz
AC 220 - 230 V, 50/60 Hz
AC 120 V, 60 Hz
16 W / 14 W
European : 0.5 W
North American : 0.3 W
Others : 0.4 W / 0.3 W
435 x 111 x 405 mm
8.0 kg
5 - 35
, 5 - 85 % (no condensation)
CD, CD-R, CD-RW, MP3
(Discs that have not been properly finalized may only be
partially playable or not playable at all.)
Specifications and appearance are subject to change for
improvement without prior notice.


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DX-7555
SERVICE PROCEDURE-1
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
PRECAUTIONS
This set employs a laser. Therefore, be sure to follow
carefully the instructions below when servicing.
WARNING!!
SERVICE WARNING : DO NOT APPROACH THE
LASER EXIT WITH THE EYE TOO CLOSELY.
IN CASE IT IS NECESSARY TO CONFIRM LASER
BEAM EMISSION, BE SURE TO OBSERVE FROM
A DISTANCE OF MORE THAN 30cm FROM THE
SURFACE OF THE OBJECTIVE LENS ON THE
OPTICAL PICKUP BLOCK.
Laser Diode Properties
Material: GaAS/GaAlAs
Wavelength: 760-800nm
Laser output: max. 0.5mW*
Emission Duration: continuous
*This output is the value measured at a distance about 1.8mm
from the objective lens surface on the Optical Pickup Block.
LASER WARNING LABEL
The labels shown below are affixed.
1. Warning label
2. Class 1 label
LUOKAN 1
LASERLAITE
KLASS 1
LASER APPARAT
CLASS 1 LASER
PRODUCT
Printed on rear panel
1. Ground for the work-desk.
Place a conductive sheet such as a sheet of copper
(with impedance lower than 10 Mohm) on the work-
desk and place the set on the conductive sheet so that
the chassis can be grounded.
2. Grounding for the test equipments and tools.
Test equipments and toolings should be grounded in
order that their ground level is the same the ground of
the power source.
3. Grounding for the human body.
Be sure to put on a wrist-strap for grounding whose
other end is grounded.
Be particularly careful when the workers wear
synthetic fiber clothes, or air is dry.
4. Select a soldering iron that permits no leakage and
have the tip of the iron well-grounded.
5. Do not check the laser diode terminals with the
probe of a circuit tester or oscilloscope.
DANGER:
INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCK FAILED OR DEFEATED. AVOID DIRECT
EXPOSURE TO BEAM.
CAUTION:
HAZARDOUS LASER AND ELECTROMAGNETIC
RADIATION WHEN OPEN AND INTERLOCK DEFEATED.
ATTENTION:
RAYONNEMENT LASER ET ELECTROMAGNETIQUE
DANGEREUX SI OUVERT AVEC L'ECLENCHEMENT
DE SECURITE ANNULE.


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DX-7555
SERVICE PROCEDURE-2
FL display
--->
0
0:00
NO DISC
--->
FL display
MA 050830A
SRV 5805A
MODEL00 00
--->
Front panel
--- Bottom view ---
Lever
NO DISC
--->
1. Initialize the unit.
(1) Press and hold down the STOP [
] button, then press the FF (fast forward) [
] button. All segments light up.
(2) Press and hold down the STOP [
] button, then press the PUSH TO ENTER (JOG) button.
(3) Press the POWER button to turn off the unit.
(4) Disconnect the AC power cord from a wall outlet.
2. Check the version of Main microprocessor (Q8005) and Servo microprocessor (Q1001).
(1) Connect the AC power cord into a wall outlet.
(2) Press the POWER button to turn on the unit.
(3) Change into the state of "NO DISC".
(4) Press and hold down the STOP [
] button, then press the FF (fast forward) [
] button twice.
The first press lights up all segments.
Main microprocessor version ---> Servo microprocessor version
(5) Press the POWER button to turn off the unit.
(6) Disconnect the AC power cord from a wall outlet.
3. Setting position before shipment.
(1) POWER button
: OFF
(2) PHONES LEVEL : MIN.
4. Take out the Disc.
If cannot take out the disc, please take out disc as follows.
(1) The lever in the direction of the arrow.
(2) The tray is slowly drawn out by the hand.


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DX-7555
EXPLODED VIEW
DX-7555
A026
x 3 pcs.
A024
x 4 pcs.
A104
x 3 pcs.
A012
x 3 pcs.
A012
x 6 pcs.
A012
x 6 pcs.
A012
x 2 pcs.
A012
x 5 pcs.
A070
x 2 pcs.
A014
x 4 pcs.
A076
x 4 pcs.
A060
x 2 pcs.
A016
x 4 pcs.
A103
x 4 pcs.
A074
x 4 pcs.
A074
x 8 pcs.
A060
x 2 pcs.
A136
x 2 pcs.
A088
x 2 pcs.
A030
x 2 pcs.
A105
x 4 pcs.
A012
x 10 pcs.
E004
A012
x 2 pcs.
A018
A090
A066
A090
A020
A044
A010
A048
A042
A058
A002
A056
U05
U08
U09
U01
U10
U02
U06
P1002
P7001
U07
A012
A028
A124
A141
A141
A126
E012
L001
A141
A073
E011
A006
A004
A090
A090
A090
A012
A090
A128
A052
A040
A032
A068
A034
A108
A100
A062
A036
A038
U03
U04
T902
A109
A110
x 10 pcs.
A072
x 3 pcs.
A130
E006
Z008
P1003
A102
P901
A901
A
A
B
C
B
C
D
D
Refer to
"EXPLODED VIEWS
OF MECHANISM"
With MECHANISM