Philips Micro Hi-Fi System MCM285 User manual

Version 1.1
MCM285
3141 785 32741
Micro Hi-Fi System -/55/77/79
Published by LX 1016 Service Audio Subject to modification
©Copyright 2010 Philips Consumer Electronics B.V. Eindhoven, The Netherlands
All rights reserved. No part of this publication may be reproduced, stored in a retrieval
system or transmitted, in any form or by any means, electronic, mechanical, photocopying,
or otherwise without the prior permission of Philips.
CONTENTS
Technical specification ..................................................................1-2
Service measurement setup..........................................................1-3
Service aids .................................................................................1-4
Instructions on CD playability ...............................................2-1.. 2-2
Disassembly diagram............ ........................................................3-1
Block diagram................................................................................4-1
Wiring diagram ..............................................................................4-2
Main board
Circuit diagram .........................................................................5-1
Layout diagram..................................................................5-2..5-3
Key board
Circuit diagram .........................................................................6-1
Layout diagram..................................................................6-2..6-3
Exploded view diagram .................................................................7-1
Mechanical parts list......................................................................7-2
Electrical parts list...................................................................8-1..8-2
Revision list.....................................................................................9-1

SPEAKERS
1-way Bass Reflex System
Impedance ........................................................................ 8 Ω
Speaker diameter ............................................................. 4”
Dimensions (w x h x d)..........14.6x23.6x18.5 (cm)
GENERAL
AC Power ........................... 110 – 127 / 220 – 240 V;
....................................................... 50/60 Hz Switchable
Dimensions (w x h x d) ....... 14.6x23.6x23.9 (cm)
Weight (with/without speakers) ..................................
................................................................................. 5.9 / 2.5 kg
Specifications and external appearance are
subject to change without notice.
AMPLIFIER
Total output power
........................................... 25 W (12.5 W per channel)
Signal-to-noise ratio .......................... ≥62 dBA (IEC)
Frequency response ......... 63 – 16000 Hz, ± 3 dB
CD PLAYER
Frequency range .................................. 63 – 16000 Hz
Signal-to-noise ratio ............................................ 65 dBA
TUNER
FM wave range ................................... 87.5 – 108 MHz
MW wave range ................................ 531 – 1602 kHz
TECHNICAL SPECIFICATION
1 - 2

1-3
LF Generator
e.g. PM5110
Recorder
Use Universal Test Cassette CrO2 SBC419 4822 397 30069
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion met
e
e.g. Sound Technology ST170
L
R
DUT
or Universal Test Cassette Fe SBC420 4822 397 30071
LEVEL METER
e.g. Sennheiser UPM550
with FF
-
filter
S/N and distortion meter
e.g. Sound Technology ST1700B
L
R
DUT
CD
Use Audio Signal Disc
(replaces test disc 3)
SBC429 4822 397 30184
Bandpass
250Hz-15kHz
e.g. 7122 707 48001
LF Voltmeter
e.g. PM2534
DUT
S/N and distortion meter
e.g. Sound Technology ST1700B
Frame aerial
e.g. 7122 707 89001
Tuner AM (MW,LW)
To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday´s cage.
Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).
RF Generator
e.g. PM5326
Ri=50:
Bandpass
250Hz-15kHz
e.g. 7122 707 48001
LF Voltmeter
e.g. PM2534
DUT
RF Generator
e.g. PM5326
S/N and distortion meter
e.g. Sound Technology ST1700B
Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).
Ri=50:
Tuner FM
MEASUREMENT SETUP

1-4
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!
N
Y
Play a CD
for at least 10 minutes
Y
playability
ok ?
N
playability
ok ?
add Info for customer
"SET OK"
check playability
N
Y
playability
ok ?
check playability
check playability
return set
Customer complaint
"CD related problem"
"fast" lens cleaning
1
2
3For flap loaders (= access to CD drive possible)
cleaning method 4is recommended
INSTRUCTIONS ON CD PLAYABILITY
2 - 1
Exchange CDM
1-4For description - see following pages

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.
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
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.
INSTRUCTIONS ON CD PLAYABILITY
2 - 2

SET BLOCK DIAGRAM
4 - 1 4 - 1

SET WIRING DIAGRAM
4 - 2 4- 2

5 - 15 - 1
CIRCUIT DIAGRAM - MAIN BOARD

5 - 2 5 - 2
LAYOUT DIAGARM - MAIN BOARD
COMPONENT SIDE VIEW

5 - 3
LAYOUT DIAGARM - MAIN BOARD
COPPER SIDE VIEW
5 - 3

CIRCUIT DIAGRAM - KEY BOARD
6 - 1 6 - 1

LAYOUT DIAGARM - KEY BOARD
COMPONENT SIDE VIEW
6 - 2 6 - 2

6 - 3 6 - 3
LAYOUT DIAGARM - KEY BOARD
COPPER SIDE VIEW

11
12
13
14
15
16
17
18
22
26/27
30
29
25
28
EXPLODED VIEW DIAGRAM
7 - 1 7 - 1

7 - 2
MECHANICAL PARTSLIST
11 996510015914 MAIN FRONT CABINET
12 996510015915 VOLUME RING
13 996510015916 VOLUME KNOB
14 996510015917 FRONT BEDECK
15 996510015918 FRONT PC LENS
16 996510015937 LCD DISPLAY
17 996510015938 LCD BRACKET
18 996510006424 7671 LCD REFLECTOR
19 996510015919 RUBBER FOOT D11x3H
22 996510010491 CD MECHANISM SANYO DA11B3VF
23 996510015920 DOOR LOCK DL-328 (WITH LOCK)
24 996510015921 CD STAND GREY(SANY0 MECH)
25 996510015922 CD DOOR D THOMSON SPRAY SILVER
26 996510015923 CD UBBE CUSHION ED (CIBA)
27 996510015924 CD UBBE CUSHION BLUE (CIBA)
28 996510015925 SANYO CD CLAMPER PLASTIC D68m
29 996510015926 PH-MCM285 CD DUST COVER
30 996510015927 7261N CD PICK UP DUSTCOVER
31 994000004726 7831 GEAR (MODE:0.8)
32 994000004727 7831 GEAR STAND (MODE:0.8)
B!996510017868 TRANSF UL EML662272MT(for -/55/77)
ACCESSORIES
ACC !996510015929 AC CORD LINE -/77
ACC !996510007654 AC CORD LINE -/55
RC 996510015928 REMOTE SET MCS SE
A 996510017867 SINGLE SPEAKER BOX L/R
Note: Only these parts mentioned in the list ar
e
normal service parts
.
ACC !996510004651 AC CORD LINE -/79
B!996510018718 TRANSFORMER (for -/79)

8 - 1
ELECTRICAL PARTSLIST
MAIN BOARD ASSEMBL
Y
ANT 996510015906 AM COIL 67:9T 4 LEADS H-COMB
BAR 994000003966 FERRITE BAR D10XL60
C1105 996510017866 E CAP 25V+-20% 4700u
CF101 996500038854 DISCRIMINATOR JT10.7MG-B
CF102 996510015911 F, LT10.7MS3 CAIQIN (RED)
CF103 996500038852 FILTER FM450AL (DOUBLE)
CN801 996510004750 16P FFC CONN. GFN102-16S-TS
CN803 996510015910 SOCKET 6P PH=2mm
D101 996510013423 CHIP TAPE DIODEIN4148 SMT1206
D102 996510013423 CHIP TAPE DIODEIN4148 SMT1206
D106 996510006431 ZENER DIODE+-5% 5V6 (TP)
D107 996500038827 ZENER DIODE -5% 3V
D1101 996510015594 DIODE 1N4001 50V/1A (EP)
D1102 996510015594 DIODE 1N4001 50V/1A (EP)
D1103 996510015594 DIODE 1N4001 50V/1A (EP)
D1104 996510015594 DIODE 1N4001 50V/1A (EP)
D1105 996510017864 BRIDGE RECTIFIER KBL406 4A(EP)
D2 996510015594 DIODE 1N4001 50V/1A (EP)
D301 996510010972 DIODE 1N4148 (EP) (TP)
D302 996510010972 DIODE 1N4148 (EP) (TP)
D609 996510010972 DIODE 1N4148 (EP) (TP)
D610 996510010972 DIODE 1N4148 (EP) (TP)
D612 996510013423 CHIP TAPE DIODEIN4148 SMT1206
D613 996510010972 DIODE 1N4148 (EP) (TP)
D616 996510010972 DIODE 1N4148 (EP) (TP)
D617 996500038828 ZENER DIODE -5% 3V9
D801 996510010980 IR LED WHITE DIA 5mm 5308IC-15
F1 !994000004782 FUSE 50T D5X20 1.6A 250V(S.B.)
F2 !996500038821 FUSE 2A 250V (VDE)(FAST BLOW)
IC1 996510015912 IC LV23010V SSOP36
IC301 994000004778 IC TDA7269A-14W
IC501 996510015913 IC 7313 (SOP)(ANGUS)
IC801 996510002298 IC LC78692W (CD DSP) SQFP80
IC802 996500038842 IC LA6548NH (4 CH DRIVER)
Q1 996510002289 NFET BUK7535-55A
Q101 996510017865 CHIP TR PNP 8050D (SMD) (EP)
Q2 996510017876 TR NPN 8050D (TP)
Q301 994000003972 CHIP TR MMBT9014C
Q302 994000003972 CHIP TR MMBT9014C
Q303 994000004064 POWER TR PNP KTA1046/P
Q304 994000004064 POWER TR PNP KTA1046/P
Q305 994000004004 CHIP TR NPN 8050C
Q306 994000004004 CHIP TR NPN 8050C
Q307 994000003972 CHIP TR MMBT9014C
Q308 994000003972 CHIP TR MMBT9014C
Q601 994000004004 CHIP TR NPN 8050C
Q606 994000003972 CHIP TR MMBT9014C
Q607 994000004005 CHIP TR PNP 8550D
Q608 994000004005 CHIP TR PNP 8550D
Q610 994000003972 CHIP TR MMBT9014C

ELECTRICAL PARTSLIST
MAIN BOARD ASSEMBL
Y
Q611 994000003972 CHIP TR MMBT9014C
Q612 996510003952 TR 8550D
Q613 996510003952 TR 8550D
Q801 994000003973 CHIP TR MMBT9015C
Q801 994000004004 CHIP TR NPN 8050C
Q802 996500038840 TR PNP 2SB764E-SSH-AE(TP)
SP1 994000004779 SPEAKER TERMINAL 4P MSP-124V
T101 996510015907 AM IFT YEL 10mm A49
T102 996510015908 AM OSC RED 10mm 2928
X101 996510015909 CRYSTAL JF7.200-134 (HC49U)
X801 996510002297 C RESON'R QZTT16.93MX 3PINS
ZD601 994000004748 ZENER DIODE+-5% 4V7
KEY BOARD ASSEMBLY
IC701 996510035701 IC LC877696B-5AS5
IC702 996510013449 IC FT24C02 (EEPROM) (SOP8)(EP)
IR601 996510002274 SENSOR AT136BV3 (36KHz) (3.3V)
J602 996510002273 ST PHONES JACK 3.5mm TC38
J603 996510002273 ST PHONES JACK 3.5mm TC38
LED1 996510015903 LED BLUE LA304B1PC-1A-02
SW630 994000004792 TACT SW 6X6MM H4.3
SW631 994000004792 TACT SW 6X6MM H4.3
SW632 994000004792 TACT SW 6X6MM H4.3
SW634 994000004792 TACT SW 6X6MM H4.3
SW636 994000004792 TACT SW 6X6MM H4.3
SW637 994000004792 TACT SW 6X6MM H4.3
SW638 994000004792 TACT SW 6X6MM H4.3
SW639 994000004792 TACT SW 6X6MM H4.3
SW640 994000004792 TACT SW 6X6MM H4.3
SW641 994000004792 TACT SW 6X6MM H4.3
SW642 994000004792 TACT SW 6X6MM H4.3
SW651 994000004792 TACT SW 6X6MM H4.3
VR701 996510002278 ENCODER EC121102X2D-HA1-034
X602 996510015904 CRYSTAL SF-32.768-JU38106 10P
X603 996500038823 CRYSTAL 8MHz(HC-49US)
Note: Only these parts mentioned in the list are
normal service parts.
8 - 2

REVISION LIST
V
* Initial Release
V
* P8-2 is revised.Changed IC701.(4/19/2010)
Version 1.0 (3141 785 32740)
Version 1.1 (3141 785 32741)
9-1