Philips MCM238 User manual

MCM238
3141 785 32000
Service AIDS & CD playability ...........................1-1...1-4
Specifications ................................................................2
Connection & Controls ...................................................3
Disassembly Instructions ...............................................4
Block & Wiring diagrams ................................................5
C-MUSIC & USB BOARD ..............................................6
KEY & USB JACK BOARD ............................................7
POWER & AMP JACK BOARD ......................................8
EXPLODE DIAGRAM .....................................................9
SERVICE PARTLIST ....................................................10
FACTORY PARTLIST ...................................................11

1-1
Service Tools:
Universal Torx driver holder .................................4822 395 91019
Torx bit T10 150mm ...........................................4822 395 50456
Torx driver set T6-T20 .........................................4822 395 50145
Torx driver T10 extended .....................................4822 395 50423
Compact Disc:
SBC426/426A Test disc 5 + 5A ...........................4822 397 30096
SBC442 Audio Burn-in test disc 1kHz .................4822 397 30155
SBC429 Audio Signals disc .................................4822 397 30184
Dolby Pro-logic Test Disc ....................................4822 395 10216
SERVICE AIDS
GB WARNING
All ICs and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are
connected with the same potential as the mass
of the set via a wrist wrap with resistance.
Keep components and tools also at this
potential.
ESD
CLASS 1
LASER PRODUCT
GB
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified,
be used
Safety components are marked by the symbol !.
Lead free

Set remains closed!
Standard repair procedure
N
Y
Play a CD
for at least 10 minutes
Y
playability
ok ?
N
playability
ok ?
add Info for customer
"SET OK"
playability
ok ?
Y
N
check playability
N
Y
playability
ok ?
check playability
check playability
EYE-Pattern
ok ?
N
Y
check "EYE-Pattern"
replace CD Drive
Laser current
ok ?
N
Y
check Laser current
CD Drive offsets
ok ?
N
Y
check CD Drive offsets
clean the lens
check playability
return set
Customer complaint
"CD related problem"
return set
return set
replace CD Drive
return set
replace CD Drive
return set
replace Signal Processor
return set
"fast" lens cleaning
1
2
3
4
5
6
7
For flap loaders (= access to CD drive possible)
cleaning method 4is recommended
1- 7For description - see following pages
CD PLAYABILITY CHECK
1-2

1
PLAYABILITY CHECK
For sets which are compatible with CD-RW discs
use CD-RW Printed Audio Disc....................7104 099 96611
TR 3 (Fingerprint)
TR 8 (600µ Black dot) maximum at 01:00
• playback of these two tracks without audible disturbance
playing time for: Fingerprint ≥10seconds
Black dot from 00:50 to 01:10
• jump forward/backward (search) within a reasonable time
For all other sets
use CD-DA SBC 444A..................................4822 397 30245
TR 14 (600µ Black dot) maximum at 01:15
TR 19 (Fingerprint)
TR 10 (1000µ wedge)
• playback of all these tracks without audible disturbance
playing time for: 1000µ wedge ≥10seconds
Fingerprint ≥10seconds
Black dot from 01:05 to 01:25
• jump forward/backward (search) within a reasonable time
2
CUSTOMER INFORMATION
It is proposed to add an addendum sheet to the set which
informs the customer that the set has been checked
carefully - but no fault was found.
The problem was obviously caused by a scratched, dirty or
copy-protected CD. In case problems remain, the customer
is requested to contact the workshop directly.
The lens cleaning (method 3) should be mentioned in the
addendum sheet.
The final wording in national language as well as the printing
is under responsibility of the Regional Service Organizations.
3
FAST LENS CLEANING (dry brush)
Use lens cleaning CD
SBC AC300...........................................9082 100 00043
Insert the lens cleaning CD, press PLAY and follow the
voice guide´s instructions on the CD.
4
LIQUID LENS CLEANING
Because the material of the lens is synthetic and coated
with a special anti-reflectivity layer, cleaning must be done
with a non-aggressive cleaning fluid. It is advised to use
“Cleaning Solvent B4-No2”, available with codenumber
4822 389 10026.
The actuator is a very precise mechanical component and
may not be damaged in order to guarantee its full function.
Clean the lens gently (don’t press too hard) with a soft and
clean cotton bud moistened with the special lens cleaner.
The direction of cleaning must be in the way as indicated in
the picture below.
Before touching the lens it is advised to clean the
surface of the lens by blowing clean air over it.
This to avoid that little particles make scratches on
the lens.
CD PLAYABILITY CHECK
1-3

5
EYE-PATTERN SIGNAL – JITTER MEASUREMENT
Measure the signal on the input of the Signal processor
using an analog oscilloscope. Please find the exact
measuring point in your Service Manual.
See below examples of the signal. Amplitude should read at
least 700mVpp using SBC444A.
good
bad
If the oscilloscope shows a signal like the ‘bad’ one, and/or
the amplitude decreases within 1 minute - the CD drive has
to be replaced.
6
CD DRIVE – LASER CURRENT MEASUREMENT
The laser current can be measured as a voltage drop on a
resistor. The resistor is marked in every Service Manual.
The value depends on the type of CD drive.
typical value most probably defect
VAMxxxx : 150-230mV ≥350mV
MCDxx : 170-230mV ≥300mV
DA1x : 210-250mV ≥350mV
DA2x : 175-200mV ≥250mV
Use SBC444A (CD-DA) for measurement.
7
CD DRIVE – OFFSET MEASUREMENT
The photodiodes of the CD-drive may have an offset. These
offsets have to be compensated by the signal processor.
High offsets can lead to poor playability of some CDs
(skipping tracks).
To measure the offset values, start the Service Test
Program - section “Focus Test” without a CD.
The offsets can be measured with a DC Millivoltmeter
directly on the connector (see drawing below). Pin
numbering varies from drive to drive.
The values from diode A-D should read 0±10mV.
Diodes E and F are less critical.
If one of the offsets is higher than ±10mV the CD drive has
to be replaced. Otherwise replace the Signal Processor.
Sanyo DA12T3
CD Drive
A
A
F
C
B
E
C
D
E
VCC
B
VREF
F
D
9
10
11
12
13
14
15
16
1800
+5V_HF
VrefCD10
A
D
E
B
C
F
GND 8
E
D
A
B
C
F
Laser power control
100n
2878
470n
2876
3821
1R
1K
3823
2880
33p
+5V
BC807-40
7879
3817
47R
3820
4R7
47R
3819
1n
2879
2877
47u
1
8
4
7811-A
LM358D 3
2
10K
3822
47R
3818
2841
100n
47n
2869
+5V_HF
LASER DIODE
U >250mV
->Laser damaged !
4,6V
3V
3,3V
3,9V
2V
0,17V
0,17V
Sanyo
DA12T3
HF-Amplifier
D3
D2
D1
Drive detection
680R
3905
3903
3K3
BC847B
7877
47n
2818
1K5
3902
5
7
4
2
1
6
3
64
8
9
10
11
470R
3893
+3.3V
2K2
3908
10K
3923
BC847B
7878
BC847B
7876 4n7
2813
3896
100R
220u
2885
2881
560p
47n
2887
560R
3901
2883
470n
2817
4u7
3n3
2814
3898
220R
3895
27K
470n 2884
+3.3V
3909
820R
3907
100R
3920
33K
3897
2882
82p
3K3
3904
2K7
3899
3906
470R
+5V_HF
HFIN
VrefCD10
100p
2815
2816
22n
LDON
to 3826,3827
VREF GE
VDDA1
VRIN
VSSA1
ISLICE
LDON
D1
D2
D3
D4
HFIN
HFREF
IREF
CD_DA: 0V / CD_RW: 3V
Σ(A-D)
800mVpp
TB = 0.5µs/div
EYE-PATTERN
1,8V
1,2V
2,4V
2,6V
0,65V
CD PLAYABILITY CHECK
1-4

2 - 1
AMPLIFIER
Output power .......................................... 2 x 5 W RMS
Signal-to-noise ratio ....................................... ≥65 dBA
Frequency response ............. 100 – 18kHz, ± 3 dB
Input sensitivity AUX ....................... 0.5 V (max. 1 V)
Impedance loudspeakers ..................................... ≥4 Ω
Impedance headphones .................... 32 Ω-1000 Ω
..................................................................................... <15mW
CD PLAYER
Frequency range ....................................... 100 – 18kHz
Signal-to-noise ratio ............................................ 65 dBA
TUNER
FM wave range ................................... 87.5 – 108 MHz
MW wave range ................................ 531 – 1602 kHz
Number of presets ........................................................ 40
Antenna
FM .................................................................... 75 Ωwire
MW ......................................................... Loop antenna
SPEAKERS
Bass reflex system
Dimensions (w x h x d) .. 158 x 250x 118 (mm)
GENERAL INFORMATION
AC Power ..................................... 220 – 240 V / 50 Hz
Dimensions (w x h x d, with/without the stand)
............... 211 x 250 x 160/211 x 250 x 126 (mm)
Weight(with/without speakers) ......... 2.9 / 1.23 kg
Standby power consumption ............................ <2 W
Eco power standby ............................................... <1 W
Specifications and external appearance are
subject to change without notice.
USB ................................................................... 12Mb/s,V1.1
......................................... support MP3 and WMA files
Number of albums/ folders ................ maximum 99
Number of tracks/titles ...................... maximum 999
USB PLAYER ( FOR MCM239/MCM239D only )
( MCM238 & MCM239 & MCM239D )

Connection
Rear connections
Warning: –Never make or change connections with the mains supply switched on. –Install your set near the AC outlet and where the AC power plug can be reached easily.
ASpeaker connections
Use the supplied speakers only. Using other speakers can damage the set or the sound quality will be negatively affected.
●Connect the cable of the left speaker to LEFT
(red and black) and the cable of the right speaker to RIGHT (red and black) as follows: a. Press the clip of the red terminal and fully insert the stripped portion of the colored (or marked) speaker cable into the socket, then release the clip b. Press the clip of the black terminal and fully insert the stripped portion of the black (or unmarked) speaker cable into the socket, then release the clip
BAntenna connections
MW antenna Connect the supplied MW loop antenna to the “AM aerial” terminal. Adjust the position of the antenna for optimal reception.
FM wire
antenna
MW loop
antenna
Speaker
(left)
Speaker
(right)
Power adaptor
Polarity insensitive
Connection
FM antenna The wire antenna supplied can only be used to receive nearby stations. For better reception we recommend using a cable antenna system or an outdoor antenna.
1Extend the wire antenna and fit it to FM
ANTENNA as shown below
Note: If you are using a cable antenna system or an outdoor antenna, fit the antenna plug, instead of the wire antenna, to FM ANTENNA .
2Move the antenna in different positions for
optimal reception (as far away as possible from the TV,VCR or other radiation sources)
3Fix the antenna’s end to the wall.
Helpful hints: – To receive optimal radio reception, put the main unit and the antennas as far away as possible from the power adaptor.
●Position the antenna as far as possible from a TV,
VCR or other radiation source.
Connecting an additional appliance
It is possible to use an additional appliance, e.g. TV,VCR or CD recorder with the set. On MCM238, you can playback music from an external source.
1Insert one plug of the audio cable (not supplied)
to the socket AUX IN at the rear panel of the main set.
2Connect the other end of the audio cable to the
AUDIO OUT terminal of the additional appliance.
3Select AUX mode on the set.
Helpful hints: – Always refer to the owner’s manual of other equipment for complete connection.
3 - 1
CONNECTION AND CONTROLS

1 3 4 5 2
6 8
7
9
0 ! @
8
Controls on the set
1DOOR OPEN
– press to open the CD door.
2PROGRAM
–CD: programs tracks
–Tuner: programs preset radio stations
3VOLUME
– adjusts the volume level –Clock/Timer: adjusts the hours and minutes
4DISPLAY/CLOCK
–Clock:
- displays the set time
-In standby mode: enters the clock setting mode
(press and hold for more than 2 seconds)
–TUNER/Audio CD/AUX: switches between
clock display and playback display
–MP3/WMA files: displays disc information
during playback
5ALBUM/ PRESET + /-
–CD: selects albums (for MP3/WMA only) –TUNER: selects a preset radio station
4 /¢
–CD: skips or searches CD tracks/titles
backwards/forwards
–Tuner: tunes to radio stations
ÉÅ
–CD: starts or pauses playback
6IR
– sensor for the infrared remote control
Helpful hints: Always point the remote control
towards this sensor.
7DSC (Digital Sound Control)
– selects predefined sound settings: ROCK,
JAZZ, POP, CLASSIC, OPTIMAL
8STANDBY-ON/ ECO POWER
– press briefly to switch the set on or off (standby/
ECO POWER);
–In standby or Eco Power mode: press and
hold to toggle between Standby and ECO POWER mode (power-saving mode)
–Red indicator: lights up red when the set is
switched to ECO POWER mode
9MUTE
– switches the sound off temporarily
0DBB (Dynamic Bass Boost)
– turns the bass enhancement on/off
!SOURCE
– selects sound source CD,TUNER, or AUX –In standby or Eco Power mode: switches the
set on and selects sound source CD,TUNER or AUX
@STOP
–CD: stops playback; erase a program
3 - 2
CONNECTION AND CONTROLS
Controls
Controls

Controls
Remote control 54 /¢
–CD: skips or searches CD tracks backwards/
forwards
–Tuner: tunes to radio stations
3 /4
–CD: selects the next/previous album (for MP3/
WMA only)
–TUNER: selects a preset radio station
ÉÅ
–CD: starts or pauses playback
6RDS
–Tuner: selects RDS (Radio Data System)
information
– sets RDS clock
7VOL +/-
– adjusts the volume level –Clock/Timer: adjusts the hours and minutes
8Source buttons
CD
– selects CD source –In standby/Eco-power mode: switches the set
on and selects CD source.
TUNER
– selects TUNER source and toggles between the
wavebands: FM and MW
–In standby/Eco-power mode: switches the set
on and selects TUNER source AUX
– selects the audio input from an additional
connected appliance
–In standby/Eco-power mode: switches the set
on and selects the audio input from an additional connected appliance
9TIMER
– enters the timer setting mode (press and hold
for more than 2 seconds)
0CLOCK
–Clock: - displays the set time
-In standby mode: enters the clock
setting mode (press and hold for more than 2 seconds)
!DSC (Digital Sound Control)
– selects predefined sound settings: ROCK,
JAZZ, POP, CLASSIC, OPTIMAL
@TIMER ON/OFF
– switches the timer on/off
Notes for remote control: – First select the source you wish to control by pressing one of the source select keys on the remote control (for example CD,TUNER). – Then select the desired function (for example
ÉÅ
,
í
,
ë
).
1BB
B
B
B
– press briefly to switch the set on or off (standby/
ECO POWER);
–In standby or Eco Power mode: press and
hold to toggle between Standby and ECO POWER mode (power-saving mode)
2DISPLAY
–Clock: - displays the set time –TUNER/Audio CD/AUX: switches between
clock display and playback display
–MP3/WMA files: displays disc information
during playback
3SLEEP
– set the sleep timer
4DBB (Dynamic Bass Boost)
– turns the bass enhancement on/off
Controls
1 2 3 4!
9 8 0 # % &
5 6 7
^ @ $
3 - 3
CONNECTION AND CONTROLS
#PROG
–CD: programs tracks
–Tuner: programs preset radio stations
$9
–CD: stops playback; erase a program
%REPEAT
– selects continuous playback
^SHUFFLE
– selects random playback
&MUTE
– switches the sound off temporarily

4 - 1 4 - 1
DISASSEMBLY DIADRAMS
A. Remove stand
Rlease click and pull it out.
B. Remove Top Cabinet
Remove screws MP 3x10 - 6 pcs.
C. Remove Amplifier board
C1: Remove screws 2 pcs.
C2: Remove screws 2 pcs.
C1
C1
C2 C2
D. Remove Main board
D1:Remove screws MP 3x10 - 3 pcs.
D2:Remove screws MP 2x8 - 6 pcs.
E. Remove Key board
E1:Remove screws MP 2x8 - 8 pcs.
D2 D2
Then remove lens frame cosmetic top_right&left
Then remove lens frame cosmetic botom_right&left
E1 E1

5 - 1
5 - 1
SET BLOCK DIAGRAM

5 - 2 5 - 2
SET WIRING DIAGRAM

6 - 1 6 - 1
CIRCUIT DIAGRAM -C-music & USB BOARD - part1

6 - 2 6 - 2
CIRCUIT DIAGRAM - C-music & USB BOARD - part2

6 - 3
6 - 3
LAYOUT DIAGRAM - C-music & USB BOARD

7 - 1 7 - 1
KEY & USB JACK BOARD

8 - 1 8 - 1
CIRCUIT DIAGRAM - POWER & AMP JACK BOARD

8 - 2
8 - 2
LAYOUT DIAGRAM - POWER & AMP BOARD

EXPLODE DIAGRAM
9-1 9-1

10-1
ACCESSORY PARTS
39 9965 100 06998 REMOTE CONTROL "PHILIPS"
40 9965 100 06999 SPK BOX 8OHM 75W FOR MCM238
41 9965 100 00131 AM LOOP ANT 18.1uH 8T
42 9965 100 00308 FM ANT WIRE 75R L1.0M
43 9965 100 07000 SMPS ADAPTOR 15V 1.2A FOR EU
44 9965 100 07001 STAND PORTION OF MCM238/12
MECHNICAL&MISCELLANEOUS PART
S
10 9965 100 06972 CABINET - FRONT FOR MCM238/12
15 9965 100 06977 LENS - CD DOOR FOR 12V
16 9965 100 06978 CABINET - REAR
17 9965 100 06979 LENS - DISPLAY FOR 12V
18 9965 100 06980 BRACKET PLAY BUTTON
19 9965 100 06981 COVER POWER BUTTON
20 9965 100 06982 BUTTON SET FUNCTION-A
21 9965 100 06983 BUTTON SET FUNCTION-B
22 9965 100 06984 BUTTON SET NAVIGATION
23 9965 100 06985 BUTTON POWER
24 9965 100 06986 BUTTON OPEN
25 9965 100 06987 OPEN-BUTTON-FIX
26 9965 100 06988 OPEN-BUTTON-SOLID
28 9965 100 07029 DOOR - CD
29 9965 100 06990 CONTROL PANNEL FOR MCM238/12V
30 9965 100 06991 COVER PLAY BUTTON
31 9965 100 06992 COVER NAVIGATION BUTTON
32 9940 000 01664 DAMPER GEAR ASSEMBLY
33 9965 100 06993 LENS - CD AMBI LIGHT GUIDE L
34 9965 100 06994 LENS - CD AMBI LIGHT GUIDE R
35 9965 100 06995 SPRING FOR OPEN-BUTTON-1
36 9965 100 06996 SPRING FOR OPEN-BUTTON-2
37 9965 100 06997 SPRING FOR DOOR CD
CDMECHA 9965 100 06482 CD MECHANISM CMS-M93BGPJ
FFC 9965 100 01359 FFC CABLE 10P L=200MM C TYPE
TUNER 9965 100 00946 TUNER MODULE AM/FM ENG07821QF
ELECTRICAL PARTS - MAIN BOARD
IC601 9965 000 41892 IC AZ1117H-3.3 REGULATOR
IC601 9965 000 40080 IC AP1117E33LA REGULATOR
IR1 9965 000 41893 IR RECEIVER BRM-4050-8-FB2.2
JK802 9940 000 03318 HP JACK D3.6MM
LCD1 9965 100 06960 LCDVD70256AHTH(VBEST)60x31.5x2
Q105 9965 100 06952 CH-TRANSISTOR NPN BCV49 SOT89
Q185 9965 100 06951 CH-TRANSISTOR, BC857C
Q186 9965 100 06953 CH-TRANSISTOR, BC847C SOT-23
Q201 9965 100 00939 TRANSISTOR BC807-25 PNP
Q202 9965 100 06953 CH-TRANSISTOR, BC847C SOT-23
Q204 9965 000 41700 CH-TRANS. DTC114YKA NPN
Q205 9965 100 00939 TRANSISTOR BC807-25 PNP
Q501 9965 100 06954 CH-TRANSISTOR,BC817-25
!