Philips MCD-299 Service Manual

MCD299/98

Service AIDS & CD playability ......................................1

Specifications ................................................................2

Connection & Controls ..................................................3

Disassembly Instructions ...............................................4

Block & Wiring diagrams ................................................5

TUNER BOARD ............................................................6

AMP BOARD .................................................................7

MAIN BOARD ................................................................8

DISPLAY BOARD ..........................................................9

KEY1 & KEY2 BOARD .................................................10

EXPLODE DIAGRAM ...................................................11

SERVICE PARTLIST ....................................................12

3141 785 31990

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

1-2

CD PLAYABILITY

Customer complaint

"CD related problem"

check playability

for at least 10 minutes

CHECK

playability

ok ?

Y

Play a CD

Set remains closed!

1

N

"fast" lens cleaning

check playability

playability

ok ?

Y

3

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

is recommended

4

Standard repair procedure

N

clean the lens

check playability

4

check playability

playability

ok ?

Y

add Info for customer

"SET OK"

return set

1

- 7

For description - see following pages

2

5

6

7

Y

return set

N

replace CD Drive

return set

N

replace CD Drive

return set

playability

ok ?

N

N

check "EYE-Pattern"

EYE-Pattern

ok ?

Y

check Laser current

Laser current

ok ?

Y

check CD Drive offsets

replace Signal Processor

return set

Y

CD Drive offsets

N

ok ?

replace CD Drive

return set

1-3

CD PLAYABILITY

CHECK

1

PLAYABILITY CHECK

For sets which are compatible with

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 ≥

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

CD-RW discs

10seconds

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
MCDxx : 170-230mV
DA1x : 210-250mV ≥350mV
DA2x : 175-200mV
Use SBC444A (CD-DA) for measurement.

≥

350mV

≥

300mV
250mV

≥

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
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.

Service Test

2 - 1

AMPLIFIER

Output power ............................................. 140 W RMS

Signal-to-noise ratio .......................................

≥

60 dBA

Frequency response ...... 150 – 20000 Hz, ± 3 dB

Input sensitivity AUX ....................... 0.5 V (max. 2 V)

Impedance loudspeakers ......................................... 6

Impedance headphones .................... 32

D

VD PLAYER

Ω

-1000

Ω
Ω

Laser Type ................................................ Semiconductor

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

Video Decoding ........................... MPEG-2 / MPEG-1

Video DAC ................................................................ 10 Bits

Signal System ............................................... PAL / NTSC

Video Format ..................................................... 4:3 / 16:9

Video S/N ........................................... 56 dB (minimum)

Composite Video Output ................ 1.0 Vp-p, 75 Ω

Audio DAC .......................................... 24 Bits / 96 kHz

Frequency Response .... 4 Hz - 20 kHz (44.1kHz)

...................................................... 4 Hz - 22 kHz (48kHz)

...................................................... 4 Hz - 44 kHz (96kHz)

Digital Output .........................................................................

....... SPDIF (Sony Philips digital interface) Coaxial

Number of programmable tracks ......................... 20

Signal-to-noise ratio ....................................... ≥ 60 dBA

40 dB (1 kHz)

Channel separation ..........................

≥

Total harmonic distortion...............< 0.1% (1 kHz)

TUNER

FM wave range ...................................87.5 – 108 MHz

Sensitivity at 75 Ω

– mono, 26 dB signal-to-noise ratio ............ 2.8 µV

– stereo, 46 dB signal-to-noise ratio ........ 61.4 µV

Tuning grid ............................................................ 9/10 kHz

15 dB

Selectivity .................................................................

≥

Total harmonic distortion ..................................... ≤ 5%

Frequency response ............ 40 – 5000 Hz (-6 dB)

Signal-to-noise-ratio ...................................... ≥ 58 dBA

SPEAKERS
Front Speakers

Impedance ........................................................................ 6 Ω

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

Frequency response ............................. 150Hz-20kHz

Dimensions .... 171 (W) x 297 (H) x 89 (D) mm

W

eight

.........................................................

1.265 kg/each

Subwoofer

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

.................................................................................................... 8”

Impedance ........................................................................ 8 Ω

Output power ........................................................... 80 W

Dimensions (w x h x d) ....................................................

..................................... 220 mm x 350 mm x 357 mm

Weight ......................................................................... 9.66 kg

USB PLAYER

USB ................................................................... 12Mb/s, V1.1

......................................... support MP3 and WMA files

Number of albums/folders ................. maximum 99

Number of tracks/titles ...................... maximum 999

GENERAL INFORMATION

AC Power ........................... 110 – 127 / 220 – 240 V;

....................................................... 50/60 Hz Switchable

Dimensions (w x h x d) .. 450 x 335 x 115 (mm)
W

eight (with/without speakers) ....... 5.63 / 3.1 kg

Standby power consumption ............................ ≤ 4W

Specifications and external appearance are
subject to change without notice.

CONNECTION AND CONTROLS

3 - 1

2

1

Step 2: Antennas Connection

antenna to the respective terminals. Adjust the

position of the antenna for optimal reception.

MW Antenna

Connect the supplied MW loop antenna and FM

VCR or other radiation source.

● Position the antenna as far as possible from a TV,

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

SPEAKERS 6

CONNECT TO SUB WOOFER

AC CORD

Step 1: Connecting speakers

terminals: right speaker to

Place the main set with the front side facing

down on a flat and firm surface.

1

(left)

Speaker

"R" and left speaker to "L".

SPEAKERS (6 Ω)

2 Connect the two front speaker cables to the

Remove the detachable cover at the left bottom

of the main set to expose the CONNECT TO

SUB WOOFER terminal.4Connect the CONNECT TO SUB

WOOFER terminal of the main set to the

3

FM Antenna

CONNECT TO MAIN SET terminal of the

subwoofer with the supplied 15-pin D-Sub cable

by matching the pins. Fix the two screws on the

connectors to ensure firm connection.

click.

Notes:

– Ensure that the speaker cables are correctly

5 Mount the detachable cover back until hearing a

outdoor FM antenna to the FM ANTENNA

terminal.

● For better FM stereo reception, connect an

connected. Improper connections may damage the

system due to short-circuit.

–For optimal sound performance, use the

supplied speakers.

– Do not connect speakers with an impedance

lower than the speakers supplied. Please refer to

the SPECIFICATIONS section of this manual.

– The delivery-attached 15-pin D-Sub cable is

intended for use with this system only. Never try it

on any other devices (e.g., do not use it in

connection of your PC).

MW loop antenna

automatically under extreme conditions. If

(not available for all versions).

this happens, let the system cool down

before reusing it

Note:

– Before installation is finished, it is not

recommended to remove the protective plastic film

attached to the surface of the front panel to avoid

any scratch caused during installation.

TV IN

IN

VIDEO IN
S-VIDEO

IN
AUDIO

To avoid overheating of the system, a safety

circuit has been built in. Therefore, your

TV IN

IN

VIDEO IN

S-VIDEO

IN

AUDIO

FM wire antenna

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

SPEAKERS 6

CONNECT TO SUB WOOFER

system may switch to Standby mode

A/V cord

AC CORD

Subwoofer

(right)

Speaker

–The voltage selector located at the

rear of this system is preset at

220V-240V from the factory. For

countries that operate at 110V-127V,

please adjust to 110V-127V before you

switch on the system.

– Before connecting the AC power cord

on the rear of the subwoofer to the wall

outlet, ensure that all other connections

have been made.

–Never make or change any

connections with the power switched on.

– High voltage! Do not open. You run the

risk of getting an electric shock.

– The machine does not contain any

user-serviceable parts.

– Modification of the product could

result in hazardous radiation of EMC or

IMPORTANT!

– The type plate is located at the rear of

AC power

cord

the system.

other unsafe operation.

CONNECTION AND CONTROLS

3 - 2

cord

Step 5: Connecting the power

After everything is connected properly,

plug in the AC power cord on the rear of

the subwoofer to the power outlet.

power switched on.

Never make or change any connection with the

speakers

Step 4: Placing the set and

mounting kit, you can either place the main set

and speakers on desktop or mount them onto

wall. Desktop installation is taken for example

With the supplied detachable stands and wall

here. For how to mount the system onto wall,

Listening to the playback of a non-USB

Optional: Connecting additional

equipment

all
W

device

4 of the larger-

PRESS

please refer to Appendix and the attached

Mounting Instructions.

size stand with the slots at the bottom of the

main set.

1 Align the side marked

UDIO OUT
A

VCR

(for example)

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

speakers in the same way.

4 Place the main set and speakers upright on the

SPEAKERS 6

CONNECT TO SUB WOOFER

desktop with the support of the stands.

Note:

–To remove the stand from the main set or either

R

L

a click.

2 Push the stand down into the slots until you hear

3 Attach the two smaller-size stands to the

speaker, while pressing down PRESS4, pull the

stand out from the slots.

X IN (R/L) jacks to

visual device (such as a VCR, Laser Disc player or

cassette desk) (cable not supplied).

the front panel to select AUX or press AUX on

the AUDIO OUT jacks on the other audio/

● Connect the system's AU

the remote control in order to activate the input

● Before starting operation, press SOURCE on

source.

Using Y Pb Pr OUT jack

IMPORTANT!

– The progressive scan video quality is

only possible when using Y Pb Pr, and a

progressive scan TV is required.

IMPORTANT!

–You only need to make one video

connection from the following options,

Step 3: Connecting TV

depending on the capabilities of your TV.

– Connect the DVD system directly to

R

the TV.

Using AV OUT jack

) jack to the

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

SPEAKERS 6

CONNECT TO SUB WOOFER

Pr/Cr Pb/Cb Y

connect the COMPOENT VIDEO

OUTPUT (

corresponding Component video input jacks (or

labeled as Y Pb/Cb Pr/Cr or YUV) on the TV.2If you are using a Progressive Scan TV (TV must

indicate Progressive Scan or ProScan capability),

to activate TV Progressive Scan, please refer to

your TV user manual. For DVD system

Progressive Scan function, see "Preparations-

Setting up Progressive Scan feature".

Note:

– If your TV does not support Progressive Scan, you

will not be able to view the picture.

1 Use component video cables (red/blue/green) to

TV IN

IN

VIDEO IN

S-VIDEO

IN

AUDIO

TV IN

IN

VIDEO IN
S-VIDEO

IN
AUDIO

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

SPEAKERS 6

CONNECT TO SUB WOOFER

only one connector to the AV OUT jack of the

DVD system.

1 Connect the end of the supplied AV cord with

connector (yellow) to the video input jack (or

labeled as A/ V In, CVBS, Composite or

Baseband) on the TV. To hear the sound of this

DVD system through your TV, connect the audio

connectors (white/ red) to the audio input jacks

on the TV.

2 For the other end, connect the video output

CONNECTION AND CONTROLS

7

2

5

0

4

9

7

8

3 - 3

9

1

&

(

7
9

5

0

%
@

*
$

2

3

)

4

(
8

7

8
6

≤

#

!

¡
™
∞

§

^

£

≥

Controls

1

Connecting a USB device or memory

7

!

@

3

9

6

7

9

#

socket.

card

IMPORTANT!

– Before connecting the USB plug, first

slide open the protective cover on the

By connecting a USB mass storage device

(including USB flash memory, USB flash players

or memory cards) to the Hi-Fi system, you can

enjoy the device's stored music through the

powerful speakers of Hi-Fi system.

Insert the USB device's USB plug into the

●

R

L

UDIO IN

VIDEO IN

A

or the devices with USB cables:

socket on the set.

f

to the socket on the set.

1 Insert one plug of the USB cable (not supplied)

USB output terminal of the USB device.

2 Insert the other plug of the USB cable to the

for the memory card:

supplied).2Use a USB cable (not supplied) to connect the

card reader into the socket on the set.

1 Insert the memory card into a card reader (not

Using the VCR for recording DVDs

L

R

Ω

A/V OUT

Y/Pb/Pr OUT

SPEAKERS 6

VCR

CONNECT TO SUB WOOFER

the DVD system.

only one connector to the A/V OUT jack of

1 Connect the end of the supplied AV cord with

This will allow you to make analogue stereo

connector (yellow) to the VIDEO IN jack on the

(two channel, right and left) recordings.

VCR and the audio connectors (white/ red) to

the corresponding audio input jacks on the VCR.

2 For the other end, connect the video output

CONNECTION AND CONTROLS

3 - 4

™ A-B

Controls

9 OK

within the same track.

–for VCD/CD/USB: to repeat a specific section

–for DVD: to repeat a specific section in a disc.

– selects different levels of brightness for the

£ DIM

track.

– Disc: skips to the previous/next chapter/title/

– to exit or confirm the selection.

0 í/ë

or VCD

display screen.

f

≤ AUDIO

! 9

–Tuner: selects a preset radio station.

–for clock/timer, to set the minute.

sets Stereo, Mono-Left or Mono-Right sound

mode.

–

program.

– In DISC/USB mode, to stop playback or clear a

or DVD

f

@ 2;

selects an audio language.

–

∞ ZOOM

playback.#VOL +/-

– In DISC/USB mode, to start or interrupt

picture or active image on the TV screen.

for this version)

–DVD/VCD/Picture CD: enlarges or reduces a

§ ANGLE/RDS (RDS function unavailable

$ MODE

– adjusts the volume upward/downward.

– selects various repeat modes or the shuffle play

entering a time, title, chapter or track.

*– DVD: selects a DVD camera angle.

–In DISC mode, to fast search in a disc by

≥ GOTO

mode for a disc.%SUBTITLE

– selects a subtitle language.

^ TIMER/SLEEP

Notes for remote control:

– First, select the source you wish to

control by pressing one of the source select

keys on the remote control (DISC or

TUNER, for example).

– Then select the desired function ( 2;, í,

Standby mode

automatically.

Power-on mode

– sets time for switching on the system

– sets the sleep timer function (auto off).

– selects a disc tray for playback.

& DISC 1/2/3/4

ë for example).

DSC/DBB

*– selects different types of preset sound equalizer

*

settings (FLAT, POP, CLASSIC, ROCK, JAZZ).

L ç/ R ç

– opens/closes the left/right disc door.

– enables or disables bass enhancement.

(

) MUTE

playback.

DISPLAY/OSD

– to interrupt or resume sound reproduction.

– displays information on TV screen during

¡

* = Press and hold the button for more than three seconds.

# USB DIRECT

Controls

Controls on the system

y

4 RIGHT ç

inputs a track/title/chapter number of the disc.

–

– opens/closes the right disc door.

VD/VCD/CD/MP3-CD/USB: enters the

3 PROGRAM

–D

5 iR SENSOR

– remote sensor

STANDBY-ON

Controls on the remote control

– jack for the external USB mass storage device.

STANDBY-ON y

1

1

– switches the system on or to standby mode.

2 Numeric Keypad (0-9)

– switches the system on or to standby mode.

– shows the status of the system.

3 LEFT ç

– opens/closes the left disc door.

2 Display screen

uner: programs preset radio stations.

program menu.–Picture CD: during playback, to select a slide

show mode.

+

/

-

6 VOLUME

– adjusts the volume level.

to select the respective sound source: DISC,

–T

4 SOURCE

–

7 Disc trays

8 Mode Selection

USB, TUNER (FM/MW) or AUX.

à / á

for TUNER .................... tunes to a station.

(disc mode only)

menu.

–DVD/VCD: enters or exits the disc contents

5 SYSTEM MENU (disc mode only)

6 DISC MENU

– to enter or exit the system menu bar.

forward within a track/disc.

*for DISC/USB ........... fast searches back and

for Clock/Timer ......... sets the hour.

– VCD2.0: switches the playback control mode on

erases a disc program.

ÉÅ ............................... starts or interrupts

9 ......................................... stops disc playback or

or off .7à / á

playback.

¡ / ™

Tuner

gradually.

automatic search for a radio frequency

– press to tune to a lower/higher radio frequency

– press and hold, then release the key to start

station.

chapter/title/track.

for TUNER .................... selects a preset radio

for DISC/USB .............. skips to the previous/next

for Clock/Timer ......... sets the minute.

DISC 1/2/3/4

9

Disc/USB

downward/upward.

– selects a disc tray for playback.

the disc menu or system menu bar.

– searches fast backward/forward.

– In DISC mode, to select a movement direction in

0 CLOCK

Standby mode

*– sets the system clock.

the disc menu or system menu bar.

8 3/4

–for clock/timer, to set the hour.

– In DISC mode, to select a movement direction in

– selects different slow playback modes for a VCD/

SOURCE

USB, TUNER (FM/MW) or AUX.

Playback mode

– displays the system clock.

– to select the respective sound source : DISC,

!

SVCD/DVD.

DSC•DBB

settings (FLAT, POP, CLASSIC, ROCK, JAZZ).

@

*– selects different types of preset sound equalizer

– enables or disables bass enhancement.

* = Press and hold the button for more than three seconds.

DISMANTLING INSTRUCTIONS

Detaching the Stands from the Speakers and Main Sets

1

To

detach the stand from the main unit,

4-1

Detach the speaker stands in the same way as

2

4-1

a. As shown, hold down
b.

Move out the stand to detach.

PRESS

1

4

you do the main unit stand#

C

D

Figure 2

Figure 3

Dismantling of the Front and Rear Panel assembly

1) Loosen 4 screws A to remove the Front Panel Ass’y by sliding it
out towards the underside before lifting up as shown in Figure 1.

2) Loosen 7 screws B and 4 screws C to remove the Rear Panel

Ass’y .

- 7 screws on the rear

- 2 screws each on the upside & downside
as shown in Figure 2.

3) Loosen 10 screws D(see Figure 3) to remove the CD Door
Track, then remove Left and Right CD Door.

- 5 screws each on the upper & under side.

B

A

Figure 1

B

Detaching the Control Panel Ass’

1) Loosen 11 screws E (see Figure 4) to remove the Control
Panel Ass’y .

y from the Front Panel Ass’y

Figure 4

E

DISMANTLING INSTRUCTIONS

4-2

4-2

Repair Hints & Service Positions

1) During repairit ispossibleto disconnecttheTuner Board
and/or CD Module completely unless the fault is sus­pected to be in that area. This will not affect the
performance of the rest of the set.

Service position A

Service position B

Note: Theflexcablesarevery fragile,care shouldbe taken

not to damage them during repair. After repair, be
very sure that the flex cables are inserted properly
intotheflexsocketsbefore encasing,otherwisefaults
may occurs.

Service position C