Philips MC145 User manual

Version 1.0
MC145
©3141 785 30680
Micro System
All version
Published by YT 0605 Service Audio Printed in The Netherlands 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.
Handling Chip Components .......................................................... 1-1
Service Tools................................................................................. 1-1
Leadfree and Safety Information................................................... 1-2
Technical Specification.................................................................. 2-1
Service Measurement Setup......................................................... 2-2
Alignment Instruction..................................................................... 2-3
Connections and Controls..................................................... 3-1...3-3
Disassembly Instruction ........................................................ 4-1...4-2
Set Block Diagram ........................................................................ 5-1
Set Wiring Diagram ....................................................................... 5-2
Display Board
Circuit diagram ......................................................................... 6-1
Layout diagram ........................................................................ 6-2
Combi Board
Circuit diagram (Tuner/Tape/Amp part).................................... 7-1
Circuit diagram (CD part) ......................................................... 7-2
Layout diagram - top view ........................................................ 7-3
Layout diagram - bottom view.................................................. 7-4
Exploded View Diagram................................................................ 8-1
Mechanical Partslist ...................................................................... 8-2
Accessories and Electrical Partslist ...................................... 9-1...9-3
TABLE OF CONTENTS

1 - 1
HANDLING CHIP COMPONENTS

1 - 2

2 - 1
SPECIFICATIONS
GENERAL:
Mains voltage /37 : 120V
/55 : 110 / 220V switchable
/79/93/98 : 220 – 240V
Mains frequency : 50/60 Hz
Power consumption : < 20W max.
< 3W at standby
Dimension center unit : 168 x 224.5 x 214.5 mm
Dimension speaker : 130 x 224.5 x 213 mm
TUNER:
FM
Tuning range : 87.5 – 108 MHz
IF Frequency : 10.7 MHz r20kHz
Sensitivity at 26sb S/N : < 18 PV
Selectivity at 600 kHz
Bandwidth : > 45 dB
IF rejection : > 50 dB
Image rejection : > 20 dB
Distortion : < 2%
Crosstalk : > 20 dB
MW
Tuning range /37 : 530 – 1700 kHz
: 531 – 1602 kHz
Grid : 9/10 kHz
IF Frequency : 450 kHz r3kHz
Aerial input : Inner bar antenna
Sensitivity at 26sb S/N : < 4.4 mV/M
Selectivity at 18 kHz
Bandwidth : > 18 dB
IF rejection : > 45 dB
Image rejection : > 30 dB
Distortion : < 5%
AMPLIFIER:
Output power : 2 x 2 W RMS
Speaker impedance : 8 ohm
Frequency response
Within r3dB : 60Hz – 16 kHz
Bass Boost ON : 6dB r3dB at 120Hz
Headphone output : 32 mW r2dB at 32 :
CASSETTE RECORDER:
Number of tracks : 2 x 2 stereo
Tape speed : 4.76 cm/sec +2.5/-1.5%
Wow and flutter : < 0.35% DIN
Fast-wind/rewind time : < 130 sec. With C-60
Bias frequency : 75 r10 kHz
Frequency response (PB) : 125 – 8 kHz (8 dB)
Signal to noise radio : > 35 dB with type 1 tape
COMPACT DISC:
Number of programming track : 20
Frequency response
Within r3 dB : 63 Hz – 16 kHz
Signal/Noise ratio : 50 dB/A-weighted
Distortion at 1 kHz : < 3%
Channel separation at 1 kHz : > 25 dB

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

2 - 3
AM I.F. ALIGNMENT
1. Set the POWER BUTTON to POWER "ON".
2. Set the FUNCTION SELECTOR SWITCH to RADIO & AM BAND.
3. Connect a SWEEPSCOPE OUTPUT to AM antenna terminal.
4. Connect a SWEEPSCOPE INPUT to pin 13 of IC1 through a 1uf capacitor and ground.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 450KHz GANG OPEN T1(AM IF) CENTER
& MAXIMUM OUTPUT
AM R.F. ALIGNMENT
1. Connect an RF generator to a standard radiating loop.
2. Connect a SCOPE and VTVM across the speaker output.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 530KHz T2 (AM OSC COIL)
2 1700KHz CT1 MAXIMUM
3 612KHz 612KHz (AM SENS COIL) OUTPUT
4 1404KHz 1404KHz CT3 (AM SENS TRIM.)
5 REPEAT STEPS 3 AND 4 TO OBTAIN BEST TRACKING.
FM I.F. ALIGNMENT
1. Set the POWER SWITCH to POWER "ON".
2. Set the FUNCTION SELECTOR to RADIO & FM BAND.
3. Connect a SWEEPSCOPE OUTPUT to pin5 of IC001 through a 20pF capacitor and ground.
4. Connect a SWEEPSCOPE INPUT to pin16 or 17 of IC001 through a 1uf capacitor and ground.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
110.7MHz GANG OPEN CHECK MAX.AMPLITUDE
BALANCED CURVE
FM R.F. ALIGNMENT
1. Connect an RF generator to the FM antenna terminal and ground.
2. Connect a SCOPE & VTVM across the speaker output.
STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR
1 87.5MHz L3 (FM OSC COIL)
2 108MHz CHECK MAXIMUM
3 90MHz 90MHz L4 (FM RF COIL) OUTPUT
4 106MHz 106MHz CT2
5 REPEAT STEPS 3 AND 4 TO OBTAIN MAX ADJUST.
CASSETTE ALIGNMENT
1. Set the FUNCTION SELECTOR BUTTON TO TAPE.
2. Connect a Scope & VTVM across the speaker output.
3. Insert the 8KHz tape in to cassette deck and push play BUTTON.
4. ADJUST HEAD for speaker maximum output.
MOTOR SCREWDRIVER
SCREWDRIVER
ADJUSTING
SCREW
CD ALIGNMENT
Auto alignment.
GANG OPEN
GANG CLOSED
GANG OPEN
GANG CLOSED
ALIGNMENT INSTRUCTION

xx
3 - 1
CONNECTION AND CONTROLS
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









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

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






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



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8

3 - 2
CONNECTION AND CONTROLS
#ONTROLSILLUSTRATIONSONPAGE
#ONTROLSONTHESYSTEMAND
REMOTECONTROL
,#$$ISPLAY
n SHOWSTHESTATUSOFTHESYSTEM
I23%.3/2
n INFRAREDSENSORFORREMOTECONTROL
02/'
FOR#$  PROGRAMSTRACKSANDREVIEWSTHE
PROGRAM
FOR4UNER  PROGRAMSTUNERSTATIONSMANUALLY
ORAUTOMATICALLY
0/7%2N
n SWITCHESTHESYSTEMTOSTANDBYON
0,!90!53%
FOR#$  STARTSORPAUSES#$PLAYBACK
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FOR#$  SKIPSTOTHEBEGINNINGOFA
CURRENTTRACKPREVIOUSNEXT
TRACK
FASTSEARCHESBACKANDFORWARD
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FOR4UNER  TUNESTORADIOSTATIONS
FORCLOCKTIMER  ADJUSTSTHEHOURSANDMINUTES
FORCLOCKTIMERFUNCTIONS
3/52#%#$45.%24!0%
n SWITCHESONTHESYSTEM
n SELECTSTHERESPECTIVESOUNDSOURCEFOR#$
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02%3%4 ONREMOTECONTROL
FOR4UNER  SELECTSAPRESETRADIOSTATION
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n REPEATSATRACK#$PROGRAMENTIRE#$
n PLAYS#$TRACKSINRANDOMORDER
34/0"!.$
FOR#$  STOPS#$PLAYBACKORERASEA
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FOR4UNER  ONTHESETONLYSELECTS
WAVEBAND
$)30,!9#,/#+
FOR#$  DISPLAY#$REMAININGTIME
ATSTANDBY  SETSTHECLOCKFUNCTION
$"" $YNAMIC"ASS"OOST
n ENHANCESTHEBASS
6/,5-%  ONREMOTECONTROL
n ADJUSTSVOLUMELEVEL

n CONNECTHEADPHONES
84APE$ECK/PERATION
/0%.s#,/3% /PENSTHETAPEKEYCOVER
2%#/2$  STARTSRECORDING
0,!9  STARTSPLAYBACK
àá FASTREWINDSFORWARDSTHETAPE
34/0s/0%.  STOPSTHETAPEOPENSTHETAPE
COMPARTMENT
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/0%.s#,/3%
n OPENSCLOSESTHE#$DOOR
-54%
n SWITCHESPLAYBACKSOUNDOFFANDON
3,%%0
n ACTIVATESDEACTIVATESORSELECTSTHESLEEPERTIME
.OTESFORREMOTECONTROL
n &IRSTSELECTTHESOURCEYOUWISHTOCONTROL
BYPRESSINGONEOFTHESOURCESELECTKEYSON
THEREMOTECONTROLFOREXAMPLE#$
45.%2
n 4HENSELECTTHEDESIREDFUNCTIONFOR
EXAMPLE É  í  ë 


xx
0REPARATIONS
2EARCONNECTIONS
4HETYPEPLATEISLOCATEDATTHEBACKOFTHE
SYSTEM
0OWER
n "EFORECONNECTINGTHE!#POWERCORDTOTHE
WALLOUTLETENSURETHATALLOTHERCONNECTIONS
HAVEBEENMADE
n )FYOURSYSTEMISEQUIPPEDWITHA6OLTAGE
3ELECTORSETTHE6/,4!'%3%,%#4/2TOTHE
LOCALPOWERLINEVOLTAGE
7!2.).'
n &OROPTIMALPERFORMANCEUSEONLYTHE
ORIGINALPOWERCABLE
n .EVERMAKEORCHANGEANYCONNECTIONS
WITHTHEPOWERSWITCHEDON
3PEAKERS#ONNECTION
&RONT3PEAKERS
#ONNECTTHESPEAKERWIRESTOTHE30%!+%23
TERMINALSRIGHTSPEAKERTO2)'(4ANDLEFT
SPEAKERTO,%&4COLOUREDMARKEDWIRETO
+ANDBLACKUNMARKEDWIRETO-
&ULLYINSERTTHESTRIPPEDPORTIONOFTHESPEAKER
WIREINTOTHETERMINALASSHOWN
.OTES
n &OROPTIMALSOUNDPERFORMANCEUSETHE
SUPPLIEDSPEAKERS
n $ONOTCONNECTMORETHANONESPEAKERTOANY
ONEPAIROF
+

-
SPEAKERTERMINALS
n $ONOTCONNECTSPEAKERSWITHANIMPEDANCE
LOWERTHANTHESPEAKERSSUPPLIED0LEASEREFERTO
THE30%#)&)#!4)/.3SECTIONOFTHISMANUAL
FM ANT
AC ~
110V
220V
&-ANTENNA
!#POWERCORD
3PEAKER
RIGHT
3PEAKER
LEFT
3 - 3
CONNECTION AND CONTROLS

4 - 1
DISASSEMBLY INSTRUCTION
A1 A2
A3
A4
A. Remove Top Cabinet
A1: Remove screws T3x8 (2 pcs)
A2: Remove screws T3x8 (2 pcs)
A3: Remove screws T3x10 (2 pcs)
A4: Remove screws T3x10 (2 pcs)
B. Remove CD Module
B1: Remove screws T3x10 (2 pcs)
B1
C. Remove CD Module Cover
C1: Remove screws T3x10 (6 pcs)
C1

4 - 2
DISASSEMBLY INSTRUCTION
4 - 2
E1
D1
D. Remove CDM
D: Remove special screws (4 pcs)
E. Remove Back Cabinet
E1: Remove screws T3x8 (2 pcs)
F2
F1
F3
F. Remove Cassette Board Assy and Tape Deck
F1: Remove screw T3x8 (1 pc)
F2: Remove screw M3x6 (1 pc)
F3: Remove screws T3x10 (4 pcs)
G1
G. Remove PCB Bracket
G1: Remove screws T3x8 (3 pcs)
H1
H. Remove Front PCB Assembly
H1: Remove screws T3x8 (14 pcs)

5 - 1 5 - 1
SET BLOCK DIAGRAM

5 - 2 5 - 2
MAIN PCB
CN3
2NC
6NC
CN7
CN4
CN101
CN103
401NC
CW4
C0N401
BCPYALPSID
FM ANT
CW6
TAPE PCB
CN3
TRANSFOMER
AC2AC1
K
CEDD
C
HC
TIWSROODDC
KCEDE
TT
ESSAC
MOTOR
3WC
HEADPHONE PCB
SET WIRING DIAGRAM

6 - 1 6 - 1
CIRCUIT DIAGRAM - DISPLAY BOARD

6 - 2 6 - 2
LAYOUT DIAGRAM - DISPLAY BOARD
COMPONENT SIDE COPPER SIDE

7 - 17 - 1
CIRCUIT DIAGRAM - COMBI BOARD (TUNER/TAPE/AMP)

7 - 27 - 2
CIRCUIT DIAGRAM - COMBI BOARD (CD part)

7 - 37 - 3
LAYOUT DIAGRAM - COMBI BOARD (TOP VIEW)

7 - 4 7 - 4
LAYOUT DIAGRAM - COMBI BOARD (BOTTOM VIEW)

8 - 1 8 - 1
EXPLODED VIEW DIAGRAM