Philips MCD-988 Service Manual

DVD Micro theatre

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MCD988

all versions

TABLE OF CONTENTS

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

CD Playability Check .............................................................1-2...1-4

Technical specification ...................................................................2-1

Service tools .................................................................................2-1

Service measurement setup ..........................................................2-2

Disassembly diagram.............................................................3-1...3-2

Software version check and upgrading .........................................4-1

Block diagram ................................................................................5-1

Wiring diagram .............................................................................6-1

VFD Board

circuit diagram ..........................................................................7-1

layout diagram ..........................................................................7-2

AMP Board (in subwoofer box)

circuit diagram ..........................................................................8-1

layout diagram .................................................................8-2...8-3

©

Copyright 2007 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.

CPU & Tuner Board

circuit diagram. .........................................................................9-1

layout diagram ..................................................................9-2...9-3

Power Board (in subwoofer box)

circuit diagram. .............................................................10-1...10-2

layout diagram ........................................................................10-3

DVD MPEG Board

circuit diagram. ............................................................. 11-1...11-3

layout diagram ........................................................................11-4

Exploded view diagram ...............................................................12-1

Mechanical partslist .....................................................................12-2

Electrical partslist...............................................................13-1...13-3

Packing exploded view (-/93).............................................14-1...14-2

Published by LX 0821 Service Audio Subject to modification

Version 1.2

3141 785 31962

SERVICE AIDS

1-1

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

GB

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

GB

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

!

.

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

ESD

CLASS 1

LASER PRODUCT

Lead free

CD PLAYABILITY CHECK

Customer complaint

"CD related problem"

check playability

1-2

Set remains closed!

1

playability

ok ?

Y

Play a CD

for at least 10 minutes

check playability

playability

ok ?

Y

N

"fast" lens cleaning

check playability

playability

ok ?

N

3

For flap loaders (= access to CD drive possible)
cleaning method

4 is recommended

Standard repair procedure

N

Y

clean the lens

check playability

playability

ok ?

check "EYE-Pattern"

4

Y

N

5

return set

add Info for customer

"SET OK"

return set

1 - 7

For description - see following pages

2

replace Signal Processor

return set

EYE-Pattern

ok ?

Y

check Laser current

Laser current

ok ?

Y

check CD Drive offsets

Y

CD Drive offsets

ok ?

N

replace CD Drive

6

return set

N

replace CD Drive

7

return set

N

replace CD Drive

return set

CD PLAYABILITY CHECK

1-3

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 ≥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

4

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 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.

2

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.

3

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.

Sanyo DA12T3

CD Drive

A

A

F

C

B

E

C

D

E

VCC

B

VREF

F

D

9

10

11

12

13

14

15

16

1800

+5V_HF

VrefCD10

A

D

E

B
C

F

GND

8

E

D

A

B

C

F

Laser power control

100n

2878

470n

2876

3821

1R

1K

3823

2880

33p

+5V

BC807-40

7879

3817

47R

3820

4R7

47R

3819

1n

2879

2877

47u

1

8

4

7811-A

LM358D

3

2

10K

3822

47R

3818

2841

100n

47n

2869

+5V_HF

LASER DIODE

U >250mV

->Laser damaged !

4,6V

3V

3,3V

3,9V

2V

0,17V

0,17V

Sanyo
DA12T3

HF-Amplifier

D3

D2

D1

680R

3905

3903
3K3

BC847B

7877

47n

2818

1K5

3902

5

7

4

2

1

6

3

64

8

9

10

11

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

LD

ON

D1

D2

D3

D4

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

CD PLAYABILITY CHECK

1-4

5

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.

6

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.

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.

good

bad

7

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.

TECHNICAL SPECIFICATIONS

SYSTEM

Total output power .................................. 400W RMS

Power supply ............................ 220 – 240 V / 50 Hz

Rated working power consumption (1/8 rated

output power) ........................................................ ) 85W

AUX input sensitivity ..................................... ) 500mV

Channel Separation ............................................. * 40dB

Distortion ....................................................................... 0.7%

Eco power Standby................................................ < 1W

DVD

Frequency response 100Hz-20kHz (+0.5/-2 dB)

Video output ................................................................1 V

P-P

HDMI 480p (60Hz), 720p (60Hz), 1080i (60Hz),

576p (50Hz), 720p (50Hz), 1080i (50Hz)

Horizontal definition................................... 500 (TV)

Dimensions . 430 (W) x 225 (H) x 141 (D) mm

Weight ....................................................................... 2.13 kg

AMPLIFIER

Rated output power (THD = 10%) ..........................

.......................................................................... 2x75W (41)

Frequency response 100Hz-20kHz (+0.5/-2 dB)

S/N Ratio ................................................................... * 60dB

Loaded impedance ..................................................... 4 1

TUNER

FM Frequency range .......................... 87.5-108 MHz

FM Noise limit sensitivity .......................... ) 20µV/M

FM S/N ........................................................................ * 46dB

Specifications

SPEAKER

Impedance ........................................................................ 4 1

Output power ............................................................ 75W

Sensitivity .............................................................. 80 ± 4dB

Frequency response ................................ 80Hz-16kHz

Dimensions . 198 (W) x 649 (H) x 163 (D) mm

Weight ............................................................ 3.66 kg each

SUBWOOFER

Subwoofer (not magnetically shielded design).....

.................................................................................. 8” (active)

Impedance ........................................................................ 8 1

Dimensions . 430 (W) x 265 (H) x 292 (D) mm

Weight ............................................................................ 8.6 kg

Output power ..........................................................150W

REMOTE

Distance ............................................................................... 6m

Angle ............................................................................... ± 30

0

Specifications subject to change without
prior notice

2 - 1

2 - 2

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

Tuner FW

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

Ri=50

‰

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 250kHz) to eliminate hum (50Hz, 100Hz).

RF Generator

e.g. PM5326

Ri=50

‰

L

R

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

DUT

CD RECORDER

Use Audio Signal Disc SBC429 4822 397 30184
(replaces test disc 3)

Use Universal Test Cassette Fe SBC420 4822 397 30071

L

R

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion meter

e.g. Sound Technology ST1700B

DUT

LF Generator

e.g. PM5110

Ri=50

‰

Disassembly diagram

A Remove Bottom Cover C Remove DVD Decoder and CPU board Assy
A1. Remove Screws M3×12（12PCS） C1. Remove Screws M3×8（6PCS）

]

A

C

B

. Remove Fan-out Screws Ｍ３×８（4PCS） D Cut Plastic Wires (3PCS)

B

D

E Remove Motor G Remove CD Mechanism
E1 Remove Screws M3×6（6PCS） G1 Remove Screws M2.6×10（8PCS）

F Remove PCB Plank H Remove Main Panel
F1 Remove Screws M3×6（2PCS） H1 Remove Screws M3×6（14PCS）

F

E

G

K

I Remove VFD Board Assy K Remove USB board

I1 Remove Screws M2.6×8（10PCS） K1 Remove Screws M3×10（2PCS）

L Remove Decorate Lamp
J Remove Slide Plank and Slide Spring L1 Remove Screws M2×8（1PCS）

I

J

L

M Remove DVD door

M

N

N Remove Gating Plate

N1 Remove Screws M2.6×8（2PCS）