Philips MCM-768 Service Manual
Micro System
MCM765/55/77/85
TABLE OF CONTENTS
Page
PCBs Location ......................................................................1-2
Specifi cations .......................................................................1-3
Measurement Setup .............................................................1-4
Service Aids, Safety Instruction, etc ...........................1-5 to 1-7
Service Test Mode ...................................................................2
Set Block Diagram & Set Wiring Diagram ...............................3
Main Board & HP Board ..........................................................4
Front Board..............................................................................5
Key Board ................................................................................6
CD Board .................................................................................7
Cassette Board ........................................................................8
Set Mechanical Exploded View & Parts List ............................9
©
Copyright 2008 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.
Published by SL 0842 Service Audio Printed in The Netherlands Subject to modification
Version 1.1
CLASS 1
LASER PRODUCT
© 3141 785 32811
PCBS LOCATION
TOP KEY BOARD
1-2
CD LOADER
CD MECHANISM
CD BOARD
CASSETTE BOARD
SWITCHING SUPPLY MODULE
FRONT BOARD
KEY BOARD
AC CORE BOARD
FM TUNER MODULE
VERSION VARIATIONS
Board in used:
MAIN BOARD
KEY & TOP KEY BOARD
FRONT BOARD
CD BOARD
CASSETTE BOARD
TUNER MODULE
SWITCHING SUPPLY MODULE
AC CORE BOARD
Features
in used:
niRDC/nixuA
MP3 Link
Video Out
Subwoofer Out
Digital Out
Karaoke Features
Voltage Selector
ECO Power Standby (LCD Display Off)
USB Direct
SINGLE CASS DECK
Type /Versions:
Service policy
Type /Versions:
Feature diffrence
/05 /12 /55 /85/77
/55
xx
xx
MCM765
/77 /85
x
MAIN BOARD
MCM765
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
M
M
M
M
M
M
C
C
C
x
* TIPS : C -- Component Lever Repair.
M -- Module Lever Repair
-- Used
x
SPECIFICATIONS
1-3
AMPLIFIER
Output power .................................... 4 x 75 W RMS*
Signal-to-noise ratio .......................... t 62 dBA (IEC)
Frequency response ......... 40 – 15000 Hz, ± 3 dB
Impedance loudspeakers ......................................... 4 :
Impedance headphones ........................................ 32 :
* (4 :, 1 kHz, 10% THD)
CD/MP3-CD PLAYER
Number of programmable tracks ......................... 20
Frequency range .................................. 20 – 20000 Hz
Signal-to-noise ratio ............................................ 75 dBA
Channel separation ..........................t 60 dB (1 kHz)
Total harmonic distortion ................................. < 0.5%
MPEG 1 Layer 3 (MP3-CD) .......... MPEG AUDIO
MP3-CD bit rate ....................................... 32-256 kbps
(128 kbps advised)
Sampling frequencies ....................... 32, 44.1, 48 kHz
USB PLAYER
USB ................................................................... 12Mb/s, V1.1
......................................... support MP3 and WMA files
Number of albums/folders ................. maximum 99
Number of tracks/titles ...................... maximum 500
TUNER
FM wave range ................................... 87.5 – 108 MHz
Sensitivity at 75 :
– mono, 26 dB signal-to-noise ratio ............ 2.8 µV
– stereo, 46 dB signal-to-noise ratio ........ 61.4 µV
Total harmonic distortion ..................................... d 5%
Frequency response ..... 63 – 12500 Hz (± 3 dB)
Signal-to-noise-ratio ...................................... t 50 dBA
TAPE DECK
Frequency response
Normal tape (type I) ...... 80 – 12500 Hz (8 dB)
Signal-to-noise ratio
Normal tape (type I) .................................... 50 dBA
Wow and flutter ......................................... d 0.4% DIN
SPEAKERS
System 2-way, double port bass reflex
Woofer ................................................................... 1x13 cm
Tweeter ...................................................................... 1x5 cm
GENERAL INFORMATION
AC Power ....................... 110 – 240 V, 60Hz / 50 Hz
Standby Power Consumption ........................ d 18 W
Dimensions (w x h x d)
– Main unit (w x h x d) ...... 175 x 252 x 360 mm
– Speaker box (w x h x d) 175 x 252 x 214 mm
Weight
With packing ......................................................... 10.16 kg
Main unit .................................................................... 3.18 kg
Speaker box ............................................................. 5.36 kg
Specifications and external appearance are
subject to change without notice.
MEASUREMENT SETUP
Tuner FM
1 - 4
Bandpass
LF Voltmeter
e.g. PM2534
RF Generator
e.g. PM5326
DUT
250Hz-15kHz
e.g. 7122 707 48001
Ri=50
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).
Tuner AM (MW,LW)
RF Generator
e.g. PM5326
Ri=50
DUT
Frame aerial
e.g. 7122 707 89001
Bandpass
250Hz-15kHz
e.g. 7122 707 48001
LF Voltmeter
e.g. PM2534
S/N and distortion meter
e.g. Sound Technology ST1700B
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).
CD
Use Audio Signal Disc
(replaces test disc 3)
DUT
SBC429 4822 397 30184
L
R
S/N and distortion meter
e.g. Sound Technology ST1700B
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
SERVICE AIDS
1 - 5
GB
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.
WARNING
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
!
.
ESD
CLASS 1
LASER PRODUCT
Lead free
INSTRUCTIONS ON CD PLAYABILITY
Customer complaint
"CD related problem"
Set remains closed!
check playability
1
1 - 6
playability
ok ?
Y
Play a CD
for at least 10 minutes
check playability
playability
ok ?
Y
N
"fast" lens cleaning
check playability
playability
ok ?
N
3
N
Y
For flap loaders (= access to CD drive possible)
cleaning method
4 is recommended
add Info for customer
"SET OK"
2
return set
1 - 4 For description - see following pages
Exchange CDM
INSTRUCTIONS ON CD PLAYABILITY
1 - 7
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
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
10seconds
4
LIQUID LENS CLEANING
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.
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.
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.
SERVICE TEST MODE
2 - 1
1. How to enter Test Mode:
1. Plug out the power cord.
2. Hold “FB” key and “STOP” Key.
3. Plug in power cord.
4. Unit will enter test mode.
2. Test mode operation:
1. Each VFD grid will ON for every 1s, starting from grid 1 to grid 12.
2. Then, each VFD grid will OFF for every 1s, starting from grid 1 to grid
12.
3. Plug out the power cord and plug in again, test mode will be exit.
2 - 1
3. Version Check:
1. In Power ON Mode, Hold “PLAY” key for 5s. LCD will show the data
code and version number.
4. USB Version Check:
1. In Power ON USB Mode, Hold “STOP” and “SOURCE” key for 5s. LCD
will show the USB chip version number:
MM SS (M=main ver S=sub ver).
5. USB Version Update:
1. In Power ON CD Mode, Hold “STOP” and “FB” key for 5s. LCD will
show the “UPDATE”.
2. Plug-in USB drive will show “LOADING”
3. Wait until the screen show “LOAD OK” and then press “PLAY” to start
update.
4. The Screen shows the “WRITING” during the update process
5. “Complete” will show up after updating the USB chip. Plug out the
power cord and plug in again to resume normal operations.
SET BLOCK & WIRING DIAGRAM
3 - 1
3 - 1
4 - 1
CIRCUIT DIAGRAM - MAIN BOARD
AUDIO & POWER AMP. SECTION (only for /55/77)
4 - 1
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