Philips MCM148 Manual de usuario

MCM148/55

transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without

the prior permission of Philips.

Published by SL 0731 Service Audio Printed in The Netherlands Subject to modification

Micro System

Version 1.0

CLASS 1

LASER PRODUCT

TABLE OF CONTENTS Page

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

Speciﬁcations .......................................................................1-3

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

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

CD Playability Check..................................................1-6 to 1-8

Software Version Checking .....................................................2

Set Block Diagram...................................................................3

Set Wiring Diagram .................................................................4

Main Board..............................................................................5

Front/MCU Board ....................................................................6

Set Mechanical Exploded View & Parts List............................7

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

Electrical Parts List..................................................................8

PCBS LOCATION

FRONT BOARD

MAIN BOARD

1-2

1-3

AMPLIFIER

Output power ........................................... 2 x 2W RMS

Signal-to-noise ratio .......................... ı60 dBA (IEC)

Frequency response ....................... 125 – 16000 Hz

Impedance loudspeakers ........................................... 8"

CD PLAYER

Frequency range ............................... 125 – 16000 Hz

Signal-to-noise ratio ............................................ 65 dBA

TUNER

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

MW wave range ................................ 530 – 1700 kHz

Sensitivity

– FM 26 dB sensitivity .......................................... 20 µV

– MW 26 dB sensitivity ................................... 5 mV/m

Total harmonic distortion..................................... İ5%

SPEAKERS

Bass reflex system

Dimensions (w x h x d) . 134 x 230 x 152 (mm)

GENERAL INFORMATION

AC Power ............................ 110 – 127 / 220 – 240V

....................................................... 50/60 Hz, switchable

Dimensions (w x h x d) .. 148 x 233 x 216 (mm)

Weight (with/without speakers) ..................................

......................................................... approx. 3.65 / 1.53 kg

Power consumption

Active .......................................................................... 15 W

Standby .................................................................... < 4 W

Specifications and external appearance are

subject to change without notice.

SPECIFICATIONS

LF Generator

e.g. PM5110

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

DUT

or Universal Test Cassette Fe SBC420 4822 397 30071

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

DUT

Use Audio Signal Disc

(replaces test disc 3)

SBC429 4822 397 30184

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

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

MEASUREMENT SETUP

1-4

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

SERVICE AIDS

GB WARNING

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.

ESD

CLASS 1

LASER PRODUCT

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 !.

Lead free

Set remains closed!

Standard repair procedure

Play a CD

for at least 10 minutes

playability

ok ?

playability

ok ?

add Info for customer

"SET OK"

playability

ok ?

check playability

playability

ok ?

check playability

EYE-Pattern

ok ?

check "EYE-Pattern"

replace CD Drive

Laser current

ok ?

check Laser current

CD Drive offsets

ok ?

check CD Drive offsets

clean the lens

check playability

return set

Customer complaint

"CD related problem"

return set

replace CD Drive

return set

replace CD Drive

return set

replace Signal Processor

return set

"fast" lens cleaning

For flap loaders (= access to CD drive possible)

cleaning method 4is recommended

1- 7For description - see following pages

INSTRUCTIONS ON CD PLAYABILITY

1-6

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

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.

LIQUID LENS CLEANING

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.

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.

INSTRUCTIONS ON CD PLAYABILITY

1-7

EYE-PATTERN SIGNAL – JITTER MEASUREMENT

Measure the signal on the input of the Signal processor

using an analog oscilloscope. Please find the exact

measuring point in your Service Manual.

See below examples of the signal. Amplitude should read at

least 700mVpp using SBC444A.

good

bad

If the oscilloscope shows a signal like the ‘bad’ one, and/or

the amplitude decreases within 1 minute - the CD drive has

to be replaced.

CD DRIVE – LASER CURRENT MEASUREMENT

The laser current can be measured as a voltage drop on a

resistor. The resistor is marked in every Service Manual.

The value depends on the type of CD drive.

typical value most probably defect

VAMxxxx : 150-230mV ≥350mV

MCDxx : 170-230mV ≥300mV

DA1x : 210-250mV ≥350mV

DA2x : 175-200mV ≥250mV

Use SBC444A (CD-DA) for measurement.

CD DRIVE – OFFSET MEASUREMENT

The photodiodes of the CD-drive may have an offset. These

offsets have to be compensated by the signal processor.

High offsets can lead to poor playability of some CDs

(skipping tracks).

To measure the offset values, start the Service Test

Program - section “Focus Test” without a CD.

The offsets can be measured with a DC Millivoltmeter

directly on the connector (see drawing below). Pin

numbering varies from drive to drive.

The values from diode A-D should read 0±10mV.

Diodes E and F are less critical.

If one of the offsets is higher than ±10mV the CD drive has

to be replaced. Otherwise replace the Signal Processor.

Sanyo DA12T3

CD Drive

VCC

VREF

1800

+5V_HF

VrefCD10

GND 8

Laser power control

100n

2878

470n

2876

3821

3823

2880

33p

+5V

BC807-40

7879

3817

47R

3820

4R7

47R

3819

2879

2877

47u

7811-A

LM358D 3

10K

3822

47R

3818

2841

100n

47n

2869

+5V_HF

LASER DIODE

U >250mV

->Laser damaged !

4,6V

3,3V

3,9V

0,17V

Sanyo

DA12T3

HF-Amplifier

Drive detection

680R

3905

3903

3K3

BC847B

7877

47n

2818

1K5

3902

470R

3893

+3.3V

2K2

3908

10K

3923

BC847B

7878

BC847B

7876 4n7

2813

3896

100R

220u

2885

2881

560p

47n

2887

560R

3901

2883

470n

2817

4u7

3n3

2814

3898

220R

3895

27K

470n

2884

+3.3V

3909

820R

3907

100R

3920

33K

3897

2882

82p

3K3

3904

2K7

3899

3906

470R

+5V_HF

HFIN

VrefCD10

100p

28152816

22n

LDON

to 3826,3827

VREF GE

VDDA1

VRIN

VSSA1

ISLICE

LDON

HFIN

HFREF

IREF

CD_DA: 0V / CD_RW: 3V

Σ(A-D)

800mVpp

TB = 0.5µs/div

EYE-PATTERN

1,8V

1,2V

2,4V

2,6V

0,65V

INSTRUCTIONS ON CD PLAYABILITY

1-8

2-1 2-1

To hold DBB & SKIP

NEXT depressed

while plugging

in mains cord.

Display shows the

ROM version

"VER y.yy MTP xx-xx-2007" VER refers to Version

y.yy refers to Software version number of the uProcessor

(counting up from 01 to 99)

xx refers to date number of the production.

SOFTWARE VERSION CHECKING

3-1 3-1

SET BLOCK DIAGRAM

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