Philips FWM37/21/22/25/37 User manual

CLASS 1
LASER PRODUCT
Service
Service
Service
Service
Service
FWM37/21/22/25/37
©Copyright 2005 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 SL0512 Service Audio Printed in The Netherlands Subject to modification.
GB
3141 785 30160
Mini System
TABLE OF CONTENTS
Page
Location of pc boards & Version variations ................1-2
Technical Specifications .............................................1-3
Measurement setup ....................................................1-4
Service Aids, Safety Instruction, etc ................ 1-5 to 1-7
Preparations & Controls ................................ 1-8 to 1-10
Maintenance & Troubleshooting ............................... 1-11
Disassembly Instructions & Service positions .............. 2
Service Test Program & DEMO Mode ........................... 3
Set Block diagram ......................................................4-1
Set Wiring diagram .....................................................5-1
Front Board .................................................................... 6
ECO6 Tuner Board : Systems Non-Cenelec .............. 7A
ECO6 Tuner Board : Systems Cenelec...................... 7B
ETF7 Tape Board........................................................... 8
3CDC-LC-MP3CD2002 Module .................................. 10
Power Module (30-70W Version) ................................ 11
AF9 Board .................................................................... 12
Set Mechanical Exploded view & parts list ................. 13
Version 1.0
Service Manual
www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals

1-2
LOCATION OF PCBS
AF9 Board
DVD Key Board
Front Board
Mains Board
Power Board
Tuner Board
Tape Board
/21 /22 /25 /37
Karaoke
News x
RDS x
Rotary Encoder (volume control) x x x x
Jog Shuttle
Voltage Selector x
Aux Input x x x x
Digital Output
Headphone Socket x x x x
Line Output
Matrix Surround Loudspeakers
Standby - FTD Clock Display x x
ECO Standby - Dark
x
x
ECO6 Tuner board - System Non-Cenelec x x
ECO6 Tuner board - System Cenelec
x
x
ETF7 Tape Module: Non-Autoreverse Ferro x x x x
POWER 2001 Module (30-70W Version): x x x
VERSION VARIATIONS:
Type /Versions: FWM37
Features &
Board in used:
x
x
x
x
x
www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals

1-3
SPECIFICATIONS
GENERAL:
Mains voltage : 110-127V/220-240V Switchable for /21/21M
230V ± 10% for /22
Mains frequency : 50/60Hz
Power consumption : < 1W at ECO Standby /22
< 15W Standby w/Clock on
< 60W Active
Clock accuracy : < 4 seconds per day
Dimension centre unit : 265 x 310 x 367mm
TUNER:
FM
Tuning range : 87.5-108MHz
Grid : 50kHz
IF frequency : 10.7MHz ±20kHz
Aerial input : 75Ωcoaxial
Sensitivity at 26dB S/N : < 7µV
Selectivity at 600kHz bandwidth : > 25dB
IF rejection : > 60dB [80dB]
Image rejection : > 25dB [75dB]
Distortion at RF=1mV, dev. 75kHz : < 3%
-3dB Limiting point : < 8µV
Crosstalk at RF=1mV, dev. 40kHz : > 18dB
MW
Tuning range : 531-1602kHz
530-1700kHz for /21/37
Grid : 9kHz
10kHz for /21/370
IF frequency : 450kHz ±1kHz
Aerial input : Frame aerial
Sensitivity at 26dB S/N : < 4.4mV/M[4.0mv/m]
Selectivity at 18kHz bandwidth : > 18dB
IF rejection : > 45dB
Image rejection : > 28dB
Distortion at RF=50mV, m=80% : < 5%
AMPLIFIER:
Output power (6Ω, 1 kHz, 10% THD) : 2 x 60W RMS
Frequency response within -3dB : 60Hz-16kHz
Dynamic Bass Boost : DBB OFF, DBB 1, DBB 2, DBB 3 2)
Digital Sound Control : Jazz, Rock, Techno, Optimal 2)
Headphone output at 32KΩ:700mV ±2dB
Input sensitivity
Aux / CDR : 500mV ± 2dB
CASSETTE RECORDER:
Number of track : 2 x 2 stereo
Tape speed : 4.76 cm/sec ±2%
Wow and flutter : < 0.4% DIN
Fast-wind/rewind time C60 : 130 sec
Bias system : 75kHz ±10kHz
Rec/Pb frequency response within 8dB : 80Hz - 12.5kHz
Signal to noise ratio Type : > 48dBA
COMPACT DISC:
Measurement done at output conn. of the CDC module.
Frequency response within ±1.5dB : 20Hz - 20kHz
Output level (in Vrms) : 550mV ±1dB, Rout = 100Ω
Signal/Noise ratio (A-weighted) : > 86dBA
Distortion at 1kHz : < 0.003%
Channel unbalance at 1kHz : ±1dB
Channel separation at 1kHz : > 60dB
De-emphasis : 0 or 15/50 mS (Switched by subcode
on the disc)
MPEG 1 Layer 3 (MP3-CD) : MPEG AUDIO
MP3-CD Bit Rate : 56-256 kbps
MP3-CD Sampling Frequencies : 32 kHz, 44.1kHz,
48kHz
Recording Format : ISO 9660
UDF format not
supported
[....] Values indicated are strictly for "Cenelec version" only
1) Frequency response in each setting is software controlled.
120V ± 15% for /37
Incredible Surround : On / Off
Max Sound : Max On, Max Off
Virtual Ambience Control : Cinema, Hall, Concert
300Ωclick fit for /37
:100kHz for /37
www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals

1-4
MEASUREMENT SETUP
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=50Ω

Tuner FM
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=50Ω

L
R
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter 
e.g. Sound Technology ST1700B
DUT
CD

Use Audio Signal Disc SBC429 4822 397 30184
(replaces test disc 3)

L
R
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter

e.g. Sound Technology ST1700B
DUT
R
ECORDER

Use Universal Test Cassette CrO2SBC419 4822 397 30069
or Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator 
e.g. PM5110

www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals

1-5
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
ESD Equipment:
Anti-static table mat - large 1200x650x1.25mm ...4822 466 10953
anti-static table mat - small 600x650x1.25mm .....4822 466 10958
Anti-static wristband ............................................4822 395 10223
Connectorbox (1MΩ) ..........................................4822 395 11307
Extension cable
(to connect wristband to conn.box) ..........4822 320 11305
Connecting cable
(to connect table mat to conn.box) ...........4822 320 11306
Earth cable (to Connect product to mat or box) --4822 320 11308
Complete kit ESD3
(combining all above products) ...............4822 320 10671
Wristband tester ...................................................4822 344 13999
SERVICE AIDS
HANDLING CHIP COMPONENTS
www.freeservicemanuals.info
9/3/2014
Global electronic heritage manuals