Philips CEM-250-X, CEM-250 Service Manual

Car Entertainment System

CEM250/55/98/51

CEM250X/78

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

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

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

Version 1.4

CLASS 1

LASER PRODUCT

Location of PCBS

1-1

SD BOARD

VERSION VARIATIONS:

Board inused:

SD BOARD

FB BOARD KB BOARD CB BOARD

MAIN BOARD

SERVO BOA RD

Features

FB BOARD

MAIN BOARD

Type/Versions

Service policy

Type/Versions

Feature diffr ence

CB BOARD

/78 /98

/55

C C C

C/M C/M C/M

/78 /98

/55

KB BOARD

SERVO BOA RD

CEM250

* TIPS:C--Com po ne nt Lever Repair.

M--Module Lever R ep ai r

--Used

SPECIFICATIONS

1-2

General

Power supply:

Fuse: Suitable speake r im pe dance: Maximum power out pu t: Continuous powe r ou tp ut:

Pre-Amp outpu t vo lt age:

Subwoofer outpu t vo lt age:

Aux-in level: Dimensions(W×H×D) :

Wight:

Radio

Frequency range

-FM Frequency range

-AM(MW) Usable sensitiv it y

-FM Usable sensitiv it y

-AM(MW)(S/N =2 0d B) Frequency respo ns e Stereo separati on Signal/noise ra ti o

12V DC(11V- 16 -) , negative ground

15V 4-8Ω 45W×4channels 22W×4channels(4Ω1 0% T. H.D )

2. 0V(USB p la y mo de; 1kHz,0dB ,10kΩ load)

2. 0V(USB p la y mo de; 61kHz, 0d B, 10kΩ load) ≥300mV 188×58×128MM

1. 0kg

87.5-108 .0MHz(Eur)

87.5-107 .9MHz(Ame)

522-1620kHz(E ur )

530-1710MHz(A me )

8dBu

3. 2dBu

20Hz-20kHz

30db(1kHz) ＞75dB

Components

Car audio system Remote contro l

Microphone Microphone hold Rubber cushion Disassembly too l Front panel Carrying case f or f ro nt panel Tri m pl ate

Screw User manual Quick start gui de Standard connec to r

Note: Specifications and design are subject to change without notice for product improvements.

MEASUREMENT SETUP

Tuner FM

1-3

Bandp as s

25 0Hz -1 5kH z

e.g . 7122 70 7 48001

LF Voltm et er

e.g . PM253 4

RF Gene ra tor

e.g . PM532 6

DUT

Ri=50Ω

S/N and d is torti on mete r

e.g . Sound Tec hnolo gy ST17 00B

Use a ban dp ass fil ter to el imina te h um(50 Hz,10 0H z) and di sturb ance fr om t he pilo ttone (1 9kHz, 38kHz ).

Tuner AM (MW,LW)

RF Gene ra tor

e.g . PM532 6

Ri=50Ω

DUT

Frame a er ial

e.g . 7122 70 7 89001

Bandp as s

25 0Hz -1 5kH z

e.g . 7122 70 7 48001

LF Voltm et er

e.g . PM253 4

S/N and d is torti on mete r

e.g . Sound Tec hnolo gy ST17 00B

To avoid at mo spher ic inte rfere nc e all AM-m easur em ents ha ve to be ca rr ied out i n a Farad ay s c age. Use a ban dp ass fil ter ( or at l east a hi gh p ass fil ter wit h 250Hz ) to e limin ate hum ( 5 0H z,100 Hz ).

Use Audi o Si gnal Di sc SBC4 29 4 822 397 3 0184 (repl ac es test d isc 3)

DUT

Cassette

Use Uni ve rsal Test Cass et te CrO2 S BC419 4 822 397 3 00 69

or Univ er sal Test Cas sette F e SB C420 48 22 397 30 071

LF Gene ra tor

e.g . PM5110

DUT

S/N and d is torti on mete r

e.g . Sound Tec hnolo gy ST17 00B

LEVEL METE R

e.g . Sennh eiser U PM550

wit h FF-fi lter

S/N and d is torti on mete r

e.g . Sound Tec hnolo gy ST17 00B

LEVEL METE R

e.g . Sennh eiser U PM550

wit h FF-fi lter

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 comp la in t "CD relate d pr ob lem"

Set remains closed!

Check playabili ty

①

1-5

playability

ok?

Play a CD

for at le ast 10 mi nutes

check playability

playability

ok?

"fast" lens cleaning

check playability

playability

ok?

③

For flap loaders( =a ccess to CD drive pos si bl e) clesning method④i s re co mmended

ann lnf o fo r custo mer

"SET O K"

return set

①-④For descripti on -s ee following pages

②

Exchange CDM

INSTRUCTIONS ON CD PLAYABILITY

Customer comp la in t "CD relate d pr ob lem"

Set remains closed!

Check playabili ty

①

1-5

playability

ok?

Play a CD

for at le ast 10 mi nutes

check playability

playability

ok?

"fast" lens cleaning

check playability

playability

ok?

③

For flap loaders( =a ccess to CD drive pos si bl e) clesning method④i s re co mmended

ann lnf o fo r custo mer

"SET O K"

return set

①-④For descripti on -s ee following pages

②

Exchange CDM

Disassembly Diagram

2-1 2-1

1. Remove the mounti ng sleeve with the removal keys. Press key and remove t he front panel.

4. Remove the screw 3 as s hown.

2. Remove the two scre ws on the back side of

3. Remove the upper co ver with a tool.

the unit with a screw dr iver.

5. Remove the bottom c over with a tool.

6. Remove the screws 4 w ith a screw driver.

7. Remove the screw 5 wi th a screw driver.

8. Remove the connec tors 6, and then remove

9. Remove the adhesi ve tapes 7.

the mechanism core .

Disassembly Diagram

10. Remove the screw 8 . 11. Remove the scr ew 9 . 12. Remove the screw 1 0 .

2-2 2-2

13. Remove the conne ctors 11, and then remove the bracket with a too l.

14. Remove the screw s 12.

3-1 3-1

Software version check & upgrade Upgrade software

1、Check Servo software version

In USB/SD/Disc mod e, press DISP + 6 simutalious ly for 2 sec, LCD display i s as below:

VS-104

102 is the servo softw are version

2、Check MCU software version

In tuner mode, press D ISP + 6 simutaliously for 2 sec , LCD display is as belo w:

VM-103

101 is the MCU softwar e version

3、Check BT software version

In tuner mode, press D ISP + 5 simutaliously for 2 sec , LCD display is as belo w:

1、 C opy servo software "BOOT.AL I" and "nemo.bin" into USB m emory, plug th e USB memory into USB socket.D evice u pgrade servo s oftwa re automatically, Don't power off or disconne ct power during the upgrade, LCD show:

SERVO UPGRADING,,,DON'T PWR OFF

Around 1 minute, servo soft ware upgrade completed and dev ice change to radio mode automa tically

2、 Del ete the servo software in th e USB and copy the MCU so ftware "CEM250MCU" (for C EM250) into USB memory, plug the USB memory into USB so cket. D evice upgra de MB software software automatically Don't powe r off or disc onnect p ower during the upgrade, LCD sho w:

MCU UPG

VBT-177

177 is the MCU softwar e version

Around 1 minute, MB software upgrade completed and device p ower off automatic ally, d iscon nect the USB memory.

+ 22 hidden pages