Philips MCM720 User manual

Version 1.1
MCM720
©3141 785 31001
MP3 Micro System
all versions
Published by LX 0718 Service Audio Subject to modification
© Copyright 2006 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.
Repair policy of PCBS ........................................................... 1-1
Technical specification .................................................................. 2-1
Service tools ................................................................................. 2-1
Service measurement setup ......................................................... 2-2
Connections and controls...................................................... 3-1...3-3
Dismantling instructions ....................................................... 4-1...4-3
Block diagram................................................................................ 5-1
Wiring diagram ............................................................................. 6-1
Main Board
circuit diagram.................................................................. 7-1...7-2
layout diagram.................................................................. 7-3...7-4
C Music Board
circuit diagram.................................................................. 8-1...8-2
layout diagram.................................................................. 8-3...8-4
Panel Board
circuit diagram.......................................................................... 9-1
layout diagram.......................................................................... 9-2
Cassette Board
circuit diagram........................................................................ 10-1
layout diagram ....................................................................... 10-2
Tuner Board
circuit diagram.........................................................................11-1
layout diagram.........................................................................11-2
Rectifier Board
circuit diagram........................................................................ 12-1
layout diagram........................................................................ 12-2
Exploded view diagram............................................................... 13-1
Mechanical partslist..................................................................... 13-2
Electrical partslist .............................................................. 14-1...14-7
TABLE OF CONTENTS
Revision list...................................................................................15-1

1 - 1
REPAIR POLICY OF PCBS
VERSION VARIATIONS:
Type /Versions:
Features
Board in used:
MCM720
Service policy
* TIPS : C -- Component Lever Repair.
M -- Module Lever Repair
√
-- Used
C
Feature diffrence
RDS
VOLTAGE SELECTOR
ECO STANDBY - DARK
Type /Versions:
C
C
C
C
C
√
/05 /12
MAIN BOARD
CASSETTE BOARD
PANEL BOARD
CMUSIC BOARD
MCM720
/05 /12
TUNER BOARD C
C
CC
C
C
RECTIFIER BOARD
√

2 - 1
TECHNICAL SPECIFICATIONS

2 - 2
SERVICE MEASUREMENT
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
Tuner FW
Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).
Ri=50
½
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 250kHz) to eliminate hum (50Hz, 100Hz).
RF Generator
e.g. PM5326
Ri=50
½
L
R
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter
e.g. Sound Technology ST1700B
DUT
CD RECORDER
Use Audio Signal Disc SBC429 4822 397 30184
(replaces test disc 3)
Use Universal Test Cassette Fe SBC420 4822 397 30071
L
R
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter
e.g. Sound Technology ST1700B
DUT
LF Generator
e.g. PM5110
Ri=50
½

3 - 1
CONNECTION AND CONTROLS
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AL#
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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
).
VOLUME
INCREDIBLE SURROUND
PROGRAM
TUNING
ALBUM / PRESET
SOURCE
TIMER SET
DBBDSC
RDS
CLOCK SETBAND
STANDBY-ON
ECO POWER
RECORD DISPLAY
WMA -MP3-CD/CD -R/CD -RW COMPATIBLE
M C M 7 2 0 M I C R O S Y S T E M
iR
OPEN/
CLOSE
USB DIRECT
5 9 8 $ ! 0 3 ^
1 2 % 4 # @ 7 ) 6 & (
OPEN CLOSE
*
% ¡ $ ™ 8 6 # @
7 £ 9 ∞ § ≤

3 - 2
CONNECTION AND CONTROLS
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EgZeVgVi^dch
GZVgXdccZXi^dch The type plate is located at the rear of the system. For users in the U.K.: please follow the instructions on page 2.
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MW
Speaker Speaker
D

3 - 3
CONNECTION AND CONTROLS
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A A B C
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4-1
4
4
-1
DISMANTLING INSTRUCTIONS
Dismantling of the Cover Cassette and Universal Loader
1) Push 1 catch each on the left & right side then remove
the Cover Cassette in the direction as shown in Figure 1
and Figure 1A.
2) Loosen 8 screws to remove the Cover Top by sliding
it out towards the rear before lifting up.
-6screws on the rear
-1screw each on the left & right side
3) Loosen 2 screws each to remove the Panel Left and
Panel Right. The Panels are removed by sliding it
towards the rear and outwards.
-1screw on the rear
-1screw on the side
-see Service position A
6) Loosen 2 screws A (see Figure 2) to remove the Bracket
Module Mounting and CD Module.
-1screw each on the left & right side
Detaching the Front Panel assembly from the Bottom/Rear assembly
Figure 1
Figure 1A Figure 2
Lift up and out
Push catches on two sides
A
Figure 3
1) Remove 2 screws B (see Figure 3) from the bottom of the
Cabinet Front.
Detaching the Front Panel assembly from the Bottom/Rear assembly
2) Release the fixation of the Combi Board (pos1102-1003)
to Bracket Combi (pos 155) by releasing the 2 catches C1
(see Figure 7) and pulling the Combi Board outwards as
shown in Figure 7A.
3) Uncatch 2 catches C2 (see Figure 7) on the left & right
sides of the Cabinet Front (pos 101) and slides the Front
Panel assembly out towards the front.
-see Service position C
B
Figure 4A Figure 4
Dismantling of the Front Panel assembly
1) The Knob Volume can be remove by pulling it out
in the direction as shown in Figure 5.
2)
3) Loosen 3 screws D (see Figure 6) to remove Front
Display Board.
4)
Loosen 3 screws C (see Figure 6) to remove the Bracket
Front Cabinet Display.
5)
Loosen 2 screws E (see Figure 6) to remove the
Headphone Board.
Figure 5
Loosen 4 screws F (see Figure 7) to remove the Module
Tape Deck.

4-2 4-2
Dismantling of the Front Panel assembly
DISMANTLING INSTRUCTIONS
Dismantling of the Rear Panel assembly
Figure 6
Figure 8
1) Loosen 3 screws K and 2 catches C5 (see Figure 8) to
remove the Tuner Board assembly.
2) Loosen 5 screws L (see Figure 8) to free the Main
Board.
3) Loosen 1 screw M (see Figure 8) to free the Mains
Socket Bracket.
4) Loosen 1 scew N and 2 catches C6 (see Figure 8) to
free the Panel Rear by sliding it out towards the rear.
Note : Tuner Board assembly and Mains Socket Bracket
can also be removed together with the Panel Rear..
Figure 7
C
D
F
E

4-3 4-3
Service position A
Service position B
Service position C
DISMANTLING INSTRUCTIONS
Repair Hints & Service Positions
1) During repair it is possible to disconnect theTuner Board
and/or CD Module completely unless the fault is sus-
pected to be in that area. This will not affect the
performance of the rest of the set.
Note: The flex cables are very fragile, care should be taken
not to damage them during repair. After repair, be
very sure that the flex cables are inserted properly
into the flex sockets before encasing, otherwise faults
may occurs.

5 - 1 5 - 1
SET BLOCK DIAGRAM

6 - 1 6 - 1
SET WIRING DIAGRAM

7 - 17 - 1
CIRCUIT DIAGRAM - MAIN BOARD
PART 1

7 - 2 7 - 2
CIRCUIT DIAGRAM - MAIN BOARD
PART 2

7 - 37 - 3
LAYOUT DIAGRAM - MAIN BOARD
COMPONENT SIDE

7 - 4
7 - 4
LAYOUT DIAGRAM - MAIN BOARD
COPPER SIDE

8 - 1 8 - 1
CIRCUIT DIAGRAM - C MUSIC BOARD
PART 1

8 - 2
8 - 2
CIRCUIT DIAGRAM - C MUSIC BOARD
PART 2

LAYOUT DIAGRAM - C MUSIC BOARD
COMPONENT SIDE
8 - 3 8 - 3

LAYOUT DIAGRAM - C MUSIC BOARD
COPPER SIDE
8 - 4 8 - 4