Philips CEM250X/78 User manual

CEM250/55/98/51

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

the prior permission of Philips.

Published by JZ-SL 0950 Service Audio Printed in The Netherlands Subject to modification

Car Entertainment System

Version 1.4

CLASS 1

LASER PRODUCT

TABLE OF CONTENTS Page

PCBs Location......................................................................1-1

Speci cations .......................................................................1-2

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

Service Aids, Safety Instruction, etc.....................................1-4

Instructures on CD Playability ....................................1-5 to 1-6

Disassembly Diagrams...............................................2-1 to 2-2

Software Version Check & Upgrade.....................................3-1

Malfunction Check Chart......................................................3-2

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

Set Wiring Diagram ..............................................................5-1

Main Board..............................................................................6

Servo Board.............................................................................7

CB/FB/USB Board...................................................................8

SD Board.................................................................................9

Key Board..............................................................................10

Set Mechanical Exploded View & Parts List.......................... 11

CEM250X/78

Revision List.......................................................................... 12

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1-1

Location of PCBS

Service policy

CEM250

VERSION VARIATIONS:

Type/Versions

Board inused:

CEM250

Feature diffrence

Features

* TIPS:C--Component Lever Repair.

M--Module Lever Repair

--Used

SD BOARD

FB BOARD

KB BOARD

CB BOARD

MAIN BOARD

SERVO BOARD

/55

CC C

C/M C/M C/M

/78 /98

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SPECIFICATIONS

1-2

Components

Note: Specifications and design are subject to change

without notice for product improvements.

Car audio system

Remote control

Microphone

Microphone hold

Rubber cushion

Disassembly tool

Front panel

Carrying case for front panel

Trim plate

Screw

User manual

Quick start guide

Standard connector

General

Radio

Power supply:

Fuse:

Suitable speaker impedance:

Maximum power output:

Continuous power output:

Pre-Amp output voltage:

Subwoofer output voltage:

Aux-in level:

Dimensions(W×H×D):

Wight:

12V DC(11V-16-),

negative ground

15V

4-8Ω

45W×4channels

22W×4channels(4Ω10%

T.H.D)

2.0V(USB play mode;

1kHz,0dB,10kΩ load)

2.0V(USB play mode;

61kHz,0dB,10kΩ load)

≥300mV

188×58×128MM

1.0kg

Frequency range

-FM

Frequency range

-AM(MW)

Usable sensitivity

-FM

Usable sensitivity

-AM(MW)(S/N=20dB)

Frequency response

Stereo separation

Signal/noise ratio

87.5-108.0MHz(Eur)

87.5-107.9MHz(Ame)

522-1620kHz(Eur)

530-1710MHz(Ame)

8dBu

3.2dBu

20Hz-20kHz

30db(1kHz)

＞75dB

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MEASUREMENT SETUP

Tuner FM

DUT

RF Generator

Bandpass

LF Voltmeter

e.g. PM5326

250Hz-15kHz

e.g. 7122 707 48001 e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

Ri=50Ω

Use a bandpass filter to eliminate hum(50Hz,100Hz) and disturbance from the pilottone(19kHz,38kHz).

Tuner AM (MW,LW)

DUT

RF Generator

Bandpass

LF Voltmeter

e.g. PM5326

250Hz-15kHz

e.g. 7122 707 48001 e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

Ri=50Ω

Frame aerial

e.g. 7122 707 89001

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 ).

DUT DUT

LF Generator

e.g. PM5110

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

Use Audio Signal Disc SBC429 4822 397 30184

(replaces test disc 3)

Cassette

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette Fe SBC420 4822 397 30071

1-3

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1-4

SERVICE AIDS

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

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1-5

INSTRUCTIONS ON CD PLAYABILITY

Set remains closed!

check playability

Exchange CDM

"fast" lens cleaning

playability

ok?

playability

ok?

playability

ok?

①

Customer complaint

"CD related problem"

Check playability

Play a CD

for at least 10 minutes

ann lnfo for customer

"SET OK"②

return set

①-④For description-see following pages

③

For flap loaders(=access to CD drive possible)

clesning method④is recommended

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1-5

INSTRUCTIONS ON CD PLAYABILITY

Set remains closed!

check playability

Exchange CDM

"fast" lens cleaning

playability

ok?

playability

ok?

playability

ok?

①

Customer complaint

"CD related problem"

Check playability

Play a CD

for at least 10 minutes

ann lnfo for customer

"SET OK"②

return set

①-④For description-see following pages

③

For flap loaders(=access to CD drive possible)

clesning method④is recommended

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2-1 2-1

Disassembly Diagram

567

1. Remove the mounting sleeve with the removal keys.

Press key and remove the front panel.

2. Remove the two screws on the back side of

the unit with a screw driver.

4. Remove the screw 3 as shown. 5. Remove the bottom cover with a tool.

3. Remove the upper cover with a tool.

6. Remove the screws 4 with a screw driver.

7. Remove the screw 5 with a screw driver. 8. Remove the connectors 6, and then remove

the mechanism core.

9. Remove the adhesive tapes 7.

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2-2 2-2

Disassembly Diagram

10. Remove the screw 8 . 11. Remove the screw 9 . 12. Remove the screw 10 .

13. Remove the connectors 11, and then remove

the bracket with a tool.

14. Remove the screws 12.

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3-1 3-1

Software version check & upgrade Upgrade software

VS-104

1、Check Servo software version

2、Check MCU software version

3、Check BT software version

VM-103

VBT-177

In USB/SD/Disc mode, press DISP + 6 simutaliously

for 2 sec, LCD display is as below:

In tuner mode, press DISP + 6 simutaliously for 2 sec,

LCD display is as below:

In tuner mode, press DISP + 5 simutaliously for 2 sec,

LCD display is as below:

102 is the servo software version

101 is the MCU software version

177 is the MCU software version

1、Copy servo software "BOOT.ALI" and "nemo.bin" into USB memory,

plug the USB memory into USB socket.Device upgrade servo software

automatically,Don't power off or disconnect power during the upgrade,

LCD show:

SERVO UPGRADING,,,DON'T PWR OFF

Around 1 minute,servo software upgrade completed and device change

to radio mode automatically

2、Delete the servo software in the USB and copy the MCU software

"CEM250MCU" (for CEM250) into USB memory, plug the USB memory

into USB socket.Device upgrade MB software software automatically

Don't power off or disconnect power during the upgrade, LCD show:

Around 1 minute,MB software upgrade completed and device power

off automatically,disconnect the USB memory.

MCU UPG

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