Philips MCM-302 Service Manual

CD Micro System

MCM302

TABLE OF CONTENTS

Location of PC Boards ............................................. 1-1

Electronic Specification

Measurement Setup ................................................ 1-3

Service Aids............................................................... 1-4

Software Version Check & Upgrade ........................ 2-1

Malfuction Check Chart ............................................. 2-2

Disassembly Diagram................................................ 3-1

Block Diagram ......................................................... 4-1

Wiring Diagram ......................................................... 4-2

Display Board ............................................................... 5

Circuit diagram ...................................................... 5-1

Layout diagram ...................................................... 5-2

Decoder Board ............................................................ 6

Circuit diagram ............................................. 6-1 to 6-3

Layout diagram ...................................................... 6-4

2009

............................................. 1-2

Power Board.................................................................. 7

Circuit diagram ...................................................... 7-1

Layout diagram ...................................................... 7-2

Exploded View .......................................................... 8-1

Service Partlist ......................................................... 9-1

Factory Partlist ...................................................... 10-1

DB 0907

Version 1.0

3141 785 33420

Location of PC Boards

1-1

Display Board

VERSION VARIATIONS

Board in used:

LCD DISPLAY BOARD CD DECODER BOARD

POWER BOARD

Features

RDS VOLTAGE SELECTOR ECO STANDBY - DARK

TDS

* TIPS : C -- Component Level Repair.

M -- Module Level Repair

-- Used

Type /Versions:

Service policy

Type /Versions:

Feature diffrence

Decoder Board

/12

/05

C M M

/12

/05

/37

Power Board

/55

/58

C M

/58

MCM302

/61

MCM302

/61

/79

/93

/94

/96

/98

Electronic Specification

1-2

AMPLIFIER

Rated Output Power.........................25W x 2RMS

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

Frequency response............. 60Hz~20KHz ±3.0db

Aux Input.................................0.5V RMS 20k ohm

DISC

LaserType.......................................Semiconductor

Disc Diameter.........................................12cm/8cm

Support Disc ...........................................................

CD-DA,CD-R,CD-RW,MP3

Audio DAC ......................................24Bits/44.1kHz

Total Harmonic Distortion .................＜0.1%(1kHz)

Frequency Response .........................20Hz~20kHz

Signal to Noise Ratio .................................≥65dBA

TUNER

FM Tuning Range .............................87.5~108MHz

Tuning grid ...........................................100k/50kHz

Sensitivity

- Mono, 26db S/N Ratio ....................................5uV

– Stereo, 50dB S/N Ratio...............................100uV

Selectivity.......................................................>33dB

Image Rejection ............................................>25dB

Total Harmonic Distortion...................................3%

Signal to Noise Ration ................................≥65dBA

SPEAKERS

Speaker Impedance ................................................4ohm

Speaker Driver, base................................................4"

Speaker Driver,tweeter ............................................NA

Frequency Response ......................60Hz~20kHz ±3.0dbe

GENERAL INFORMATION

Total Output power ....................................... 50W RMS

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

Operation PowerConsumption ................................. 25W

Standby Power Consumption....................................<4W

Eco Standby Power Consumption.............................<1W

Headphone Output .................................2X15mV 32ohm

USB Direct......................................................Version 1.1

Dimensions

– Main unit (w x h x d)............................200x115x250mm

– Speaker box (w x h x d).......................150x250x165mm

– SUBwoofer(w x h x d)...............................................NA

Weight

–With Packing ...................................................6.75KG

–Main Unit ...........................................................2.55KG

–Speaker box ....................................................2X1.7KG

–SUBwoofer................................................................NA

Specifications and external appearance are subject to change without notice.

MEASUREMENT SETUP

Tuner FM

1-3

Bandpass

LF Voltmeter

e.g. PM2534

RF Generator

e.g. PM5326

DUT

250Hz-15kHz

e.g. 7122 707 48001

Ri=50:

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=50:

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

1-4

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

ESD

CLASS 1

LASER PRODUCT

Lead free

INSTRUCTIONS ON CD PLAYABILITY

Customer complaint

"CD related problem"

Set remains closed!

check playability

1-

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

add Info for customer

"SET OK"

return set

1 - 4 For description - see following pages

Exchange CDM

INSTRUCTIONS ON CD PLAYABILITY

1-

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 t10seconds

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 t10seconds

Fingerprint t10seconds 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

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.

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