Philips CEM250X/78 User manual

Gar Entertainment System CEM2s0rssrgs
CEM250Xze
Servl@e
Servloe
Service
@ Copyright 2009 Philips Consumer Electronics B.V Eindhoven, The Netherlands
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 0928 Service Audio Printed in The Netherlands Subjecl to modification
tffi^szo('
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DIRECT
CLASS 1
LASER PRODUCT
@ 3141 78s33192
Version
&1.2 PHITIPS

1-1
Location of PCBS
SD BOARD FB BOARD CB BOARD KB BOARD
SERVO BOARD
MAIN BOARD
VERSION VARIATIONS:
Board inused: \ Service PolicY
cEM250
t55 t78 /98
SD BOARD cc
FB BOARD cc
KB BOARD C C
CB BOARD cc
MAIN BOARD c(, c
SERVO BOARD M M M
Features \ Feature diffrence
cEM250
/55 t78 /98
TIPS:C--Component Lever Repair.
M-Module Lever Repair
r/ --Used

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1-5
INSTRUCTIONS OilI CD PLANBIUTY
-- -1
9elt rcmalns clogedl t
; For flap loaders(=access to CD drive possible)
F closning method@is recommended
O-@For description-see following pages

1-5
INSTRUCTIONS ON CD PLAYABILITY
O-@For description-see following pages
loaders(=665sss to CD drive possible)
method@is recommended

1-4
SERVICE AIDS
@ wARNTNG
All lCs 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.
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^A,.
Route the wire trees correctly and fix them with the
mounted cable clamps.
Check the insulation of the AC Power lead for external
damage.
Check the strain relief of the AC Power cord for proper
function.
Check the electrical DC resistance between the AC Power
Plug and the secondary side (only for sets which have a AC
Power isolated power supply):
CLASS 1
LASER PRODUCT
1 . Unplug the AC Power cord and connect a wire
between the two pins of the AC Power plug.
2. Set the AC Power switch to the "on" position (keep the
AC Power cord unplugged!).
3. Measure the resistance value between the pins of the
AC Power plug and the metal shielding ol the tuner or
the aerial connection on the set. The reading should be
larger than 4.5 Mohm (For U.S. it should be between
4.2 Mohm and 12 Mohm).
4. Switch "off" the set, and remove the wire between the
two pins of the AC Power plug.
o Check the cabinet for defects, to avoid touching of any
inner parts by the customer.
ESD
)
IAr
INFORMATION ABOUT LEAD.FREE SOLDERING
Philips CE is producing lead-free sets from 1.1.2005 onwards.
IDENTIF!CATION:
Regardless of special logo (not always indicated) one must treat all sets from F-JEiZdIElonrards, according next rules:
. On our website you find more information to:
* BGA-de-/soldering (+ baking instructions)
+ Heating-profiles of BGAs and other lCs used in Philips-sets
* Lead free
You will find ihis and more technical information within the "magazine", chapter "workshop news".
For additional questions please contact your local repair-helpdesk.
SERVIGE INSTRUCTION
Salety regulations require that after a repair, the set must be returned in its original condition. Pay in particular attention to
the following points:

1-3
MEASUREMENT SETUP
Tuner FM
Bandpass
250H2-l 5kHz
Useabandpass filtertoeliminatehum(50H2,100H2)anddisturbancefromthepilottone(19kHz,38kHz).
TunerAM (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 250H2) to eliminato hum ( 50H2,100H2 ).
CD
UseAudio Signal Disc SBC4294822397 30184
(replaces test disc 3)
Cassette
Use Universal Test Cassette CrO2
or Universal Test Cassette Fe sBc419 4822 397 30069 sBc420 4822 397 30071
LEVEL METER
a.9. Sennhei3erUPM5S0
with FF-filter
LEVEL METER
e.g. SennheiserUPM550
wlth FF-Illt6r
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SPEGIFICATIONS
I General
Power supply:
Fuse:
Suitable speaker impedance:
Maximum power output:
Continuous power output:
Pre-Amp output voltage:
Subwoofer output voltage :
Aux-in level:
Dimensions(WxHx D):
Wight:
I Radio
Frequency range
.FM
Frequency range
-AM(MW)
Usable sensitivity
.FM
Usable sensitivity
-AM(MW)(S/N=20dB)
Frequency response
Stereo separation
Sjgnal/noise ratio
1-2
12v DC(11v-16-),
negative ground
15V
4-8 0
4SWX4channels
22Wx4channels(4010%
T. H. D)
2. OV(USB play mode;
1kHz, OdB, 'l0ko load)
2. oV(USB play mode;
61kHz,0d8,10k0 load)
>300mV
188x 58x'l28MM
1.okg
87. 5-1 08. 0MHz(Eur)
87. 5-'lO7.9MHz(Ame)
522-1 620kHz(Eur)
530-1 71 0MHz(Ame)
SdBu
3. 2dBu
20Hz-20kqz
30db(1 kHz)
>75dB
f Components
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
1
1
1
1
1
2
1
,|
2
4
1
1
1
Note: Specifications and design are subject to change
without notice for product imprcruements.

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