CD RECEIVER
MODEL CR-305X
Ref.NO.3654
082000
TABLE OF CONTENTS
CR-305X
Specifications -----------------------------------------------------------
Caution on replacement of optical pickup --------------------------
Protection of eyes from laser bam during servicing ---------------
Service procedures -----------------------------------------------------
Front panel view ------------------------------------------------------
Rear panel view -------------------------------------------------------
Remote controller ----------------------------------------------------
Microprocessor connection diagram --------------------------------
Microprocessor terminal descriptions ------------------------------
IC Block diagram and descriptions ---------------------------------
CD Mechanism exploded view --------------------------------------
Replacement of optical pickup ---------------------------------------
Chassis exploded view parts list -------------------------------------
Chassis exploded view -----------------------------------------------
Block diagram ---------------------------------------------------------
Wiring view ------------------------------------------------------------
Printed circuit board view parts list --------------------------------7
Schematic diagram (Amplifier section) -----------------------------
Printed circuit board view 1-------------------------------------------
Schematic diagram (CD & Microprocessor section) -------------
Printed circuit board view 2-------------------------------------------
Printed circuit board view 3-------------------------------------------
CD Adjustment procedures ------------------------------------------
Clock adjustment procedures ----------------------------------------
Assembling of pad ---------------------------------------------------
packing view ---------------------------------------------------------
2
2
3
4
5
6
7
8
9
10
19
21
22
23
25
26
27
29
31
33
35
37
39
40
41
42
Silver models
120 V AC,60 Hz
230 V AC,50 Hz
220 - 230 V AC,50/60Hz
UDD,UDT
UPP
UGT,UGR
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST
ARE CRITICAL FOR RISK OF FIRE AND ELEC-
TRIC SHOCK. REPLACE THESE COMPONENTS
WITH ONKYO PARTS WHOSE PARTS NUMBERS
APPEAR AS SHOWN IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPO-
SED PARTS ARE ACCEPTABLY INSULATED FORM
THE SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
1
CR-305X
CAUTION ON REPLACEMENT OF OPTICAL PICKUP
The laser diode in the optical pickup block is so sensitive to
static electricity, surge current and etc., that the components
are liable to be broken down or its reliability remarkably
deteriorated.
During repair,carefully take the following precautions.
(The following precautions are included in the service
parts.)
PRECAUTIONS
1.Ground for the work-desk.
Place a conductive sheet such as a sheet of copper
(with impedance lower than 10Mohm) 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.
SPECIFICATIONS
AMPLIFIER
Po
w
er Output:
2 x 20 watts at 4 ohms 1 kHz DIN
2 x 17 watts at 6 ohms 1 kHz DIN
2 x 15 watts at 8 ohms 1 kHz DIN
2 x 20 watts min, RMS at 4 ohms 1 kHz
no more than 1 % THD (FTC rating)
2 x 25 watts at 4 ohms EIAJ
Dynamic Power:
2 x 24 watts at 4 ohms
2 x 18 watts at 8 ohms
Total Harmonic Distortion: 0.2 % at 10 watts output
IM Distortion:
0.2 % at 10 watts output
Damping Factor:
25 at 8 ohms
Sensitivity and Impedance: TAPE/CDR/MD IN : 150 mV, 50 kohms
Frequency Response:
10 to 50,000 Hz : +0 / 3 dB
Acoustic Presence:
1 40 Hz +6.0 dB
2 80 Hz +7.5 dB
3 40 Hz +10 dB
80 Hz +8.0 dB
4 40 Hz +10 dB
80 Hz +8.0 dB
10 kHz +4.5 dB
SingletoNoise Ratio:
100 dB (IHF A)
Muting
55 dB
CD PLAYER
Signal Readout System:
Optical noncontact
Reading Rotation:
About 500 200 r.p.m.
(constant linear velocity)
Linear Velocity:
1.2 1.4 m / s
Error Correction System:
Cross Interleave Reed Solomon code
D / A Converter:
1 bit
Digital Filter:
352.8 kHz 8 times over sampling
Number of Channels:
2 (stereo)
Frequency Response:
5 Hz 20 kHz
TUNER
Tuning range
FM: 87.9 to 107.9 MHz (200 kHz steps)
(U.S. & Canadian models)
87.5 to 108.00 MHz (50 kHz steps)
(Other area models)
AM: 530 to 1710 kHz (10 kHz steps)
(U.S. & Canadian models)
522 to 1611 kHz (9 kHz steps)
(Other area models)
Usable sensitivity
FM: Mono 11.2 dBf,
1.0 µV (75 ohms IHF)
0.9 µV (75 ohms DIN)
Stereo 17.2 dBf,
2.0 µV (75 ohms IHF)
23.0 µV (75 ohms DIN)
AM:
30 µV
50 dB Quieting sensitivity
FM: Mono 17.2 dBf, 2.0 µV (75 ohms)
Stereo 37.2 dBf, 20.0 µV (75 ohms)
Capture ratio
FM: 2.0 dB
Image rejection ratio
FM: 40 dB (U.S. & Canadian models)
85 dB (Other area models)
AM: 40 dB
IF rejection ratio
FM: 90 dB
AM: 40 dB
Signal to noise ratio
FM: Mono 73 dB, IHF
Stereo 67 dB, IHF
AM: 40 dB
Selectivity
FM: 50 dB DIN
(±300 kHz at 40 kHz Devi.)
AM Suppression Ratio: 50 dB
Harmonic distortion
FM: Mono 0.2%
Stereo 0.3%
AM: 0.7 %
Frequency response
FM: 30 to 15,000 Hz (±1.5 dB)
Stereo separation
FM: 35 dB at 1,000 Hz
25 dB at 100 to 10,000 Hz
Stereo threshold
FM: 17.2 dBf, 2.0 µV (75 ohms)
GENERAL
Power Supply:
AC 120 V, 60 Hz (U.S. & Canadian models)
(Some Asian models)
AC 230 V, 50 Hz (European models)
AC 220-230 V, 50/60 Hz (Other area models)
Power Consumption: 60 W (U.S. & Canadian models)
(Some Asian models)
55 W (Other area models)
Dimensions:
205 W x 103 H x 362 D mm
(8-1/6" x 4-1/16" x 14-1/4")
Weight:
4.0 kg (8.8 lbs)
Specifications and features are subject to change without notice
.
Power supply and voltage vary depending on the area in which the unit is purchased.
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
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 PICK-UP BLOCK.
Laser Diode Properties
Material: GaAS/GaALAs
Wavelength: 780nm
Emission Duration: continuous
Laser output: max. 0.5mW*
*This output is the value measured at a distance about 1.8mm
from the objective lens surface on the Optical Pick-up Block.
LASER WARNING LABEL
The label shown below are affixed.
1. Warning label
1. Class 1 label
"CLASS 1 LASER
PRODUCT"
LUOKAN 1
LASERLAITE
KLASS 1
LASER APPARAT
3
CR-305X
SERVICE PROCEDURE
1. Replacing the fuses
3. Safety-check out
(Only U.S.A. model)
After correcting the original service problem perform the
follwing safety check before releasing the set to the customer
Connect the insulating-resistance tester between the plug of
power supply cord and terminal GND on the back panel.
Specifications: More than 10Mohm at 500V
REF.NO.
PART NO.
DESCRIPTION
F901
252157
1.25A-UL/T-237, Fuse <D, DT>
252083
0.4A-SE-EAW, FUSE <P,GR, GT>
NOTE :
<D, DT>
: 120 V model only
<P,GR, GT> : 230 V model only
This symbol located near the fuse indicates that the
fuse used is show operating type, For continued protection against
fire hazard, replace with same type fuse , For fuse rating, refer to
the marking adjest to the symbol.
Ce symbole indique que le fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.
1. Press and the hold down the MEMORY button , then press the
After "all lighting " is displayed
2. Press the standby/on button.
After " CLEAR " is displayed, the preset memory and each mode
stored in the memory, are initialized and will return to the
factory settings.
2. To initialize the unit
4. Memory Preservation
This unit does not require memory preservation batteries. A built-in
memory power back-up system preserves the contents of the
memory during power failures and even when the unit is un-plugged.
The unit must be plugged in order to charge the back-up
system.
The memory preservation period after the unit has been unplugged
varies depending on climate and placement of the unit. On the
average, memory contents are protected over a period of a few
weeks after the last time the unit has been unplugged. This pe-riod
is shorter when the unit is exposed to a highly humid cli-mate.
5. Changing the AM band step
With the exception of the worldwide models, a tuning step selector
switch is not provided. When you change the band step, change
the parts as shown below.
To 10kHz
To 9kHz
R705
3.3k
10k
R706
5.6k
open
5. Removement of tray
1.Remove the top cover
2.Turn the locked screw to the clockwise to release the lock of gear.
(Refer to fig-1)
Lock
Unlock
Bottom side
Fig-1
3.Pull out the tray.
4.Remove the stopper. (Refer to fig-2)
5.Press teh tray stopper to the arrow mark direction and remove
the tray ass'y. (Refer to fig-3)
Fig-2
Stopper
Tray
Fig-3
Tray
stopper
Tray
stopper
Front
Front
Front
4
CR-305X
8
CR-305X
MICROPROCESSOR
CONNECTION
DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
4G
5G
6G
7G
8G
9G
10G
VDD
CDCLK
XL T
CDDA
T A
SENS20
DSPMUT
SQCK
SENS
SQSO
RESET
STEREO
SD
A VSS
VOLDO
WN
VOLUP
AREA
IN/OUT
SIGN
AL
K1
K0
A
VDD
A
VREF
POFF
XT2
VSS
X1
X2
RCLK
RD
A
T
A
FREQCAL
FCE
PLLCE
Q701
MICR
OPR
OCESSOR
MPD78045FGF-119-3B9
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
P5
P4
P3
P2
P1
LED2
CLOSE
OPEN
CDA
UT
OADJ
XRST
LED1
POWERCD
VDD
ANGMUT
TUMUT
SYSOUT
IC
REMIN
SYSIN
RDSCLK
SCOR
RDSSIG
RDSDA
T A
POWERAMP
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
3G
2G
1G
P17
P16
P15
P14
P13
P12
P11
VLO
AD
P10
P9
P8
P7
P6
Q751
FL
TUBE
10-BT
-167GK
GRID
IG
-
10G
SEGMENT
P11-P17
SEGMENT
P1
-
P10
-VP
+5V
CLOK
9
XLA
T
8
DA
T
A
7
26
SENS2
Q184-Q186
CD
MUTNG
SWITCH
SQCK
4
SENS
6
SQSO
5
Q703
SYSTEM
RESET
U10
TUNER
UNIT
INITIALIZING (FM/AM
B
AND)
CD
TRA
Y
OPEN/CLOSE
DETECT
OR
SWITCH
+5V
PO
WER
F
AILURE
DETECT
OR
RCLK
PLL
RD
A
T
A
Q704
MO
T
OR
DRIVE
IC
T
A7291S
M
V
OLUME
Q401
INPUT
SELECT
OR
TC9273N-007
Q402
A
COUSTIC
PRESENCE
SELECT
OR
IC
14
CK
15
D
A
T
A
16
ST
15
CK
16
D
A
T
A
13
ST
(CLOCK
ADJUST
)
TP-01
(
CLOCK
ADJUST)
C703
+5V
Q180
RDS
DECODER
B
U1923
2
RD
A
T
A
16
RCLK
1
Q
U
AL
U751
REMO
TE
SENSOR
STEREO
SIGN
AL
SD
RI
Q702
B
UFFER
INITIALIZING
(CD
A
U
T
O
ADUST
ON/OFF)
Q704
MO
T
OR
DRIVE
IC
T
A7291S
M
CD
TRA
Y
OPEN/CLOSE
Q702
LED
DRIVE
D782
A
COUSTIC
PRESENCE
Q110,Q111
CD
PO
WER
SWTCH
Q405,Q406
INPUT
MUTE
SWITCH
Q181-Q183
TUNER
MUTE
SWITCH
23
XRST
79
XRST
57
SCOR
Q301
CD
DIGIT
AL
SIGN
AL
PR
OCESSOR
CXD2589Q
FR
FF
PLA
Y
ST
OP
OPEN
MEMOR
Y
STBY
AU
T
O
/MONO
DISPLA
Y
INPUT<
INPUT>
AP
KEY
SWITCH
Q101
RF
SIGN
AL
PR
OCESSING
SER
V
O
AMP
CXA1992BR
Q601,Q602
PO
WER
AMP
SWITCH
Q904
PO
WER
RELA
Y
DRIVE
+5V
+5V
S762
S761
S760
S759
S758
S757
S756
S755
S754
S753
S752
S751