Philips FWM-377 Service manual

Mini System

FWM377/05/12/55

TABLE OF CONTENTS

Speciﬁ cations ..............................................................1-1

Location of PCBs.........................................................1-2

Specification ................................................................1-3

Measurement Setup ....................................................1-4

Service Aids, Safety Instruction, etc ..................1-5 to 1-7

Block Diagram ................................................................2

Wiring Diagram ...............................................................3

Front Board & USB Board ..............................................4

CPU/WMA Board ............................................................5

Main Board & Power Board ............................................ 6

AMP (Low Power) Board ................................................ 7

Mechanical Exploded View & Parts List .........................8

Revision List ...................................................................9

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 SL0750 Service Audio Printed in The Netherlands Subject to modiﬁ cation.

Page

CLASS 1

LASER PRODUCT

3141 785 31631

Version 1.1

LOCATION OF PCBS

1-2

CD BOARD

CPU BOARD

KEY BOARD

MAIN BOARD

VERSION VARIATIONS:

Type /Versions: FWM377

Features & Board in used:

CPU/WMA Board /55 CPU/WMA Board /12 Voltage Selector

Digital Output

Line Output Matrix Surround Loudspeakers

ECO Standby - Dark ECO6 Tuner board - System Non-Cenelec ECO6 Tuner board - System Cenelec ETF7 Tape Module: Non-Autoreverse Ferro x x x USB Direct

/05 /12 /55

xxx

POWER BOARD

HF POWER BOARD

AMP BOARD

x xxxtupnI xuA

xxxtekcoS enohpdaeH

xxyalpsiD kcolC DTF - ybdnatS

SPECIFICATION

1-3

AMPLIFIER

RMS output power

1KHz (Low channel-both channels driven) .......

............................................................. 60 W per channel

10KHz (High channel-both channels driven) ....

............................................................. 60 W per channel

Total output power ........................................... 240 W

Signal-to-noise ratio .......................... 67 dB A (IEC)

Frequency response .......................... 50 – 16000 Hz

Input sensitivity

AUX ................................................. 1500mV/2000mV

Output

Speakers .................................................................... 6 :

Headphones ............................................................. 32 :

(1) (8 :, 1 kHz, 10% THD)

CD/MP3-CD PLAYER

Number of programmable tracks ......................... 40

Frequency response ............. 50 – 20000 Hz -3dB

Signal-to-noise ratio ....................................... 75 dB A

Channel separation .......................... 50 dB (1 kHz)

Total harmonic distor tion ................................. < 1.5%

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

TAPE PLAYER

Frequency response

Normal tape (type I) ...... 125 – 8000 Hz (8 dB)

Signal-to-noise ratio

Normal tape (type I) ................................. 48 dB A

Wow and flutter ......................................... d 0.4% DIN

SPEAKERS

System 2-way; double port bass reflex

Impedance ........................................................................ 6 :

Woofer .................................................................. 1 x 13cm

Tweeter..................................................................... 1 x 5cm

Dimensions (w x h x d) ....27.3 x 31 x 20.4 (cm)

Weight ............................................................. 3.65 kg each

GENERAL

Material/finish ................................... Polystyrene/Metal

AC Power ..................................... 220 – 230 V / 50 Hz

Power Consumption

Active ...................................................................... 120 W

Standby .................................................................. d 15 W

Eco Power standby ........................................ d 1 W

Dimensions (w x h x d) ..... 26.5 x 31 x 38.4 (cm)

Weight (without speakers) ................................. 9.1 kg

TUNER

FM wave range ................................... 87.5 – 108 MHz

MW wave range ................................ 531 – 1602 kHz

Number of presets ........................................................ 40

Antenna

FM ....................................................................... 75 : wire

MW ............................................................ Loop antenna

USB PLAYER

USB ................................................................... 12Mb/s, V1.1

......................................... support MP3 and WMA files

Number of albums/folders ................. maximum 99

Number of tracks/titles ...................... maximum 400

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=50Ω

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=50Ω

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).

Use Audio Signal Disc (replaces test disc 3)

DUT

SBC429 4822 397 30184

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette

LF Generator

e.g. PM5110

Fe SBC420 4822 397 30071

DUT

S/N and distortion met

e.g. Sound Technology ST170

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

SERVICE AIDS

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

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

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

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

CLASS 1

LASER PRODUCT

Lead free

INSTRUCTIONS ON CD PLAYABILITY

Customer complaint

"CD related problem"

Set remains closed!

check playability

1-6

playability

ok ?

Play a CD

for at least 10 minutes

check playability

playability

ok ?

"fast" lens cleaning

check playability

playability

ok ?

For flap loaders (= access to CD drive possible) cleaning method

4 is recommended

Standard repair procedure

clean the lens

check playability

playability

ok ?

check "EYE-Pattern"

return set

add Info for customer

"SET OK"

return set

1 - 7

For description - see following pages

replace Signal Processor

return set

EYE-Pattern

ok ?

check Laser current

Laser current

ok ?

check CD Drive offsets

CD Drive offsets

ok ?

replace CD Drive

return set

replace CD Drive

return set

replace CD Drive

return set

INSTRUCTIONS ON CD PLAYABILITY

1-7

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

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 B4-No2”, available with codenumber 4822 389 10026.

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.

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.

FAST LENS CLEANING (dry brush)

Use lens cleaning CD

SBC AC300...........................................9082 100 00043

Insert the lens cleaning CD, press PLAY and follow the voice guide´s instructions on the CD.