Philips MC-320 Service manual

Service

Micro System

Service Manual

Service Service

Service

MC-320

All Version

Page

Location of PCBs & Version Variations ......................1-2

Technical Specifications .............................................1-3

Measurement setup....................................................1-4

Service Aids, Safety Instruction, etc. ..........................1-5

Preparations & Controls .............................................1-7

Disassembly Instructions............................................... 2

Set Block diagram ......................................................... 3

Set Wiring diagram ........................................................ 4

Key Board ...................................................................... 5

Power Board .................................................................. 6

Tuner Board...................................................................7

MCU & CD Board .......................................................... 8

Connection Board..........................................................9

Main Board .................................................................. 10

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

CLASS 1

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 SL 0321 Service Audio Printed in The Netherlands Subject to modification

Version 1.0

LASER PRODUCT

3140 785 32530

LOCATION OF PRINTED CIRCUIT BOARDS

BO

A

RD

1-2

POWER BOARD

VERSION VARIATIONS

Type/Versions

Features & Board in used

RDS function ECO Standby Aux Input Digital Coaxial Out Line Out Subwoofer Out Headphone Out AC Voltage Selector Non-Cenelec Tuner

Cenelec Tuner



MC-320

/21

/22

x x

/25 /30 /37

x x

x x x

SPECIFICATIONS

GENERAL:

Mains voltage /21 : 110V ~ 127V / 220V ~ 240V Switchable /22/25 : 220V ~ 230V /30 : 240V /15/33 : 220V /37 : 120V Mains frequency /22/25/30 : 50Hz /15/21/33 : 50/60Hz

/37 : 60Hz Power consumption /22/25 : < 1W at ECO Standby : < 7W at Standby (DEMO mode off)

: 40W at Active Clock accuracy : < 4 seconds per day Dimension centre unit : 155 x 220 x 270mm

TUNER: FM

Tuning range : 87.5-108MHz IF frequency : 10.7MHz ± 20kHz Aerial input

/15/21/22/25/37 : 75Ω Coaxial /37 : 300Ω Dipole Sensitivity at 26dB S/N : < 22dBf Selectivity at S9/300kHz : > 33dB IF Rejection : > 60dB Image Rejection : > 20dB Distortion at RF=1mV, dev. 75kHz : < 3%

-3dB Limiting point : < 23.5dB Crosstalk at RF=1mV, dev. 40kHz : > 26dB Modulation Hum : > 45dB AM Suppression I/P: 48~82dBf : > 30dB

AM (MW)

Tuning range /15/21/22/25/30 : 531-1602kHz /21/37 : 530-1700kHz Grid /21 : 9kHz / 10kHz /15/22/25/30 : 9kHz /37 : 10kHz IF frequency : 450kHz ± 1kHz Aerial input : Frame aerial 18.1µH Sensitivity at 26dB S/N : < 3.25mV/M Selectivity at S9/300kHz : > 15dB AGC Figure of Merit : > 25dB IF rejection : > 24dB Image rejection : > 20dB Distortion at RF=50mV, m=80% : < 5% Mudulation Hum with REC or : > 40dB Spurious Response Rejection : > 28dB

1-3

Tuning range : 153-279kHz Grid : 3kHz IF frequency : 450kHz ± 1kHz Aerial input : Frame aerial 18.1µH Maximum Sensitivity : < 1.5mV/M Sensitivity at 26dB S/N : < 6.0mV/M Selectivity at S9/300kHz : > 24dB IF rejection : > 26dB Image rejection : > 30dB Distortion I/P:5~50mV : < 5% Modulation Hum with REC or : > 40dB

AMPLIFIER:

Output power (6Ω, 1kHz, 10% THD) : 2X18W Frequency response within -3dB : 60Hz-14kHz Digital Sound Control (DSC) : Optimal,Classic,Jazz,

Rock DBB : ON/OFF Incredible Surround (IS) : ON/OFF Input sensitivity (±3dB) for Rated Output Power at 1kHz Aux in : 500mV; Rs=600Ω

Tuner in : FM67.5kHz, AM80%Modulation

CD in : -6dB track

Tape in : 250nWb/m

Output sensitivity

Headphone output at 32Ω : 15mW ± 1dB

CASSETTE RECORDER:

Number of track : 2 Tracks (Stereo) Tape speed : 4.76 cm/sec ± 2% Wow and flutter : < 0.4% DIN Fast-wind/Rewind time C60 : 130 sec Bias system : 80Hz - 10kHz Rec/Pb freq. response within 8dB : 78kHz ± 10kHz Signal to Noise Ratio (A-weighted) : > 48dBA Distortion 250nWb/m : < 5% Channel Difference at overall : < 4dB

COMPACT DISC:

Frequency response within ± 3dB : 63Hz - 14kHz Output level (in Vrms) : 500mV, Z Signal/Noise ratio (A-weighted): > 70dBA Distortion at 1kHz : < 0.02% Channel unbalance at 1kHz : < ±2dB Channel separation at 1kHz : > 55dB Emphasis : 15/50 µS (switched

automatically by CD10) THD Noise(1kHz) : > 70dB Outband Attenuation : > 20dB for Frequency > 40kHz

= 100Ω

out

MEASUREMENT SETUP

Tuner FM

1-4

Bandpass

LF Voltmeter

e.g. PM2534

RF Generator

e.g. PM5326

DUT

250Hz-15kHz

e.g. 7122 707 48001

Ri=50Ω

S/N and distortion meter

e.g. Sound Technology ST1700B

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

Tuner AM (MW,LW)

RF Generator

e.g. PM5326

Ri=50Ω

DUT

Frame aerial

e.g. 7122 707 89001

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

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).

Use Audio Signal Disc (replaces test disc 3)

DUT

SBC429 4822 397 30184

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator

e.g. PM5110

DUT

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

SERVICE AIDS

1-5

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

Cassette:

SBC419 Test cassette CrO2................................. 4822 397 30069

SBC420 Test cassette Fe ..................................... 4822 397 30071

MTT150 Dolby level 200nWb/M............................ 4822 397 30271

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

HANDLING CHIP COMPONENTS

ESD Equipment: Anti-static table mat - large 1200x650x1.25mm ... 4822 466 10953

Anti-static table mat - small 600x650x1.25mm..... 4822 466 10958

Anti-static wristband .............................................. 4822 395 10223

Connector box (1MΩ)............................................ 4822 320 11307

Extension cable

(to connect wristband to conn. box).................. 4822 320 11305

Connecting cable

(to connect table mat to conn. box) .................. 4822 320 11306

Earth cable (to connect product to mat or box) .... 4822 320 11308

Complete kit ESD3

(combining all above products)......................... 4822 320 10671

Wristband tester .................................................... 4822 344 13999

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.

ATTENTION

Tous les IC et beaucoup d’autres semi-conducteurs sont sensibles aux décharges statiques (ESD). Leur longévité pourrait être considérablement écourtée par le fait qu’aucune précaution n’est prise à leur manipulation. Lors de réparations, s’assurer de bien être relié au même potentiel que la masse de l’appareil et enfiler le bracelet serti d’une résistance de sécurité. Veiller à ce que les composants ainsi que les outils que l’on utilise soient également à ce potentiel.

1-6

ESD

WARNUNG

Alle ICs und viele andere Halbleiter sind empfindlich gegenüber elektrostatischen Entladungen (ESD). Unsorgfältige Behandlung im Reparaturfall kan die Lebensdauer drastisch reduzieren. Veranlassen Sie, dass Sie im Reparaturfall über ein Pulsarmband mit Widerstand verbunden sind mit dem gleichen Potential wie die Masse des Gerätes. Bauteile und Hilfsmittel auch auf dieses gleiche Potential halten.

WAARSCHUWING

Alle IC’s en vele andere halfgeleiders zijn gevoelig voor electrostatische ontladingen (ESD). Onzorgvuldig behandelen tijdens reparatie kan de levensduur drastisch doen verminderen. Zorg ervoor dat u tijdens reparatie via een polsband met weerstand verbonden bent met hetzelfde potentiaal als de massa van het apparaat. Houd componenten en hulpmiddelen ook op ditzelfde potentiaal.

AVVERTIMENTO

Tutti IC e parecchi semi-conduttori sono sensibili alle scariche statiche (ESD). La loro longevità potrebbe essere fortemente ridatta in caso di non osservazione della più grande cauzione alla loro manipolazione. Durante le riparazioni occorre quindi essere collegato allo stesso potenziale che quello della massa dell’apparecchio tramite un braccialetto a resistenza. Assicurarsi che i componenti e anche gli utensili con quali si lavora siano anche a questo potenziale.

Safety regulations require that the set be restored to its original condition and that parts which are identical with those specified, be used.

Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen, identiek aan de gespecificeerde, worden toegepast.

Les normes de sécurité exigent que l’appareil soit remis à l’état d’origine et que soient utiliséés les piéces de rechange identiques à celles spécifiées.

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu beachten. Der Original zustand des Geräts darf nicht verändert werden; für Reparaturen sind Original-Ersatzteile zu verwenden.

“Pour votre sécurité, ces documents doivent être utilisés par des spécialistes agréés, seuls habilités à réparer votre appareil en panne”.

CLASS 1

LASER PRODUCT

Invisible laser radiation when open. Avoid direct exposure to beam.

Osynlig laserstrålning när apparaten är öppnad och spärren är urkopplad. Betrakta ej strålen.

Warning !

Varning !

3122 110 03420

Le norme di sicurezza esigono che l’apparecchio venga rimesso nelle condizioni originali e che siano utilizzati i pezzi di ricambio identici a quelli specificati.

"After servicing and before returning set to customer perform a leakage current measurement test from all exposed metal parts to earth ground to assure no shock hazard exist. The leakage current must not exceed 0.5mA."

Varoitus !

Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina näkymättömälle laserisäteilylle. Älä katso säteeseen!

DK Advarse !

Usynlig laserstråling ved åbning når sikkerhedsafbrydere er ude af funktion. Undgå udsaettelse for stråling.

PREP ARATIONS AND CONTROLS

Preparations

Rear connections

The type plate is located at the rear of the

system.

Powe r

Before connecting the AC power cord to the

wall outlet, ensure that all other connections

ve been made.

WARNING!

–For optimal performance, u se only the

original po

wer cable.

–Never make or change any connections

with the power switched on.

To avoid overheating of the system, a safety

circuit has been built in. Therefore, your

system may switch to Standby mode

automatically under extreme conditions. If

this happens, let the system cool down

before reusing it (not available for all versions).

Antennas Connection

Connect the supplied AM loop antenna and FM

antenna to the respective terminals. Adjust the

position of the antenna for optimal reception.

AM Antenna

Position the antenna as far as possible from a TV,

VCR or other radiation source.

speaker

(right)

speaker

(left)

AC power cord

AM loop

antenna

FM wire antenna

Preparations

FM Antenna

For better FM stereo reception, connect an

outdoor FM antenna to the FM AERIAL (FM

ANTENNA) terminal.

Speakers Connection

Front Speakers

Connect the speaker wires to the SPEAKERS

terminals, right speaker to "RIGHT" and left

speaker to "LEFT", colored (mar ked) wire to

"+" and black (unmarked) wire to "-".

Fully insert the stripped portion of the speaker

wire into the terminal as shown.

Notes:

–For optimal sound performance, use the

supplied speakers.

– Do not connect more than one speaker to any

one pair of

speaker terminals.

– Do not connect speakers with an impedance

lower than the speakers supplied. Please refer to

the SPECIFICATIONS section of this manual.

Optional connection

The optional equipment and connecting cords

are not supplied. Refer to the operating

instructions of the connected equipment for

details.

Connecting other equipment to your

system

Connect the audio left and right OUT terminals

of a TV, VCR, Laser Disc player, DVD player or

CD Recorder to the AUX terminals.

Note:

– If you are connecting equipment with a mono

output (a single audio out terminal), connect it to

the AUX left terminal. Alternatively, you can use a

“single to double” cinch cable (the output sound

still remain mono).

Before using the remote control

Pull out the plastic protective sheet.

Select the source you wish to control by

pressing one of the source select keys on the

remote control (for example CD, TUNER).

Then select the desired function (for example

Replacing battery (lithium

CR2025) into the remote control

Pull out the knob

slightly to the left.

Pull out the battery compar tment

Replace a new battery and fully inser t the

battery compar tment back to the original

position.

plastic

protective

sheet

CAUTION!

Batteries contain chemical substances, s o

they should be disposed off properly.

1-7

PREP ARATIONS AND CONTROLS

Controls

Controls on the system and

remote control

Display

–shows the status of the system.

PROG/ REV

for CD .................programmes tracks and reviews

the programme.

for TUNER ........ programmes tuner stations

manually or automatically.

for TAPE.............. sets tape reverse modes

CLOCK SET • RDS /

for CLOCK ....... set the clock function.

for CD .................starts or interr upts CD playback

for TAPE.............. starts the tape playback

Mode Selection

VOLUME (-/+)

–adjusts the volume level.

– on the system only - adjusts the hour and minutes

for the clock/ timer functions.

PRESET/ TIMER SET

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

for CD .................skips to the beginning of a

current track/previous/

subsequent track

for Timer (

only) to set timer under standby

SEARCH/ TUNE

for TUNER ........ Tune to a station

for CD .................fast searches back and forward

within a track/CD.

for TAPE.............. fast rewind/ wind tape

STOP 9

................................. stops CD playback or erase a

CD programme.

................................. stops tape playback/recording.

REC ............... starts recording.

SOURCE

–selects the respective sound source for CD/

TUNER/ TAPE /AUX.

–switches on the system.

DISPLAY-BAND (on the remote control

DISPLAY A/B)

for TUNER ........ change the tuner radio

band.(FM/ MW/ LW)

for CD .................change the CD display mode

for TAPE.............. switches tape direction

iR SENSOR

–infrared sensor for remote control.

ECO POWER indicator

STANDBY ON2

–switches the system to standby.

PHONES - connects to headphone .

- open/ close the cassette door.

CD OPEN

– open the CD door.

INTERACTIVE SOUND controls:

DBB .................... (Dynamic Bass Boost) enhances

the bass.

DSC ..................... (Digital Sound Control) selects

sound characteristics: CLASSIC/

JAZZ/ ROCK/ OPTIMAL.

INCREDIBLE SURR.

(IS) ....................... creates a super-enhanced stereo

effect.

REPEAT

–repeats a track/ CD programme/ entire CD.

SHUFFLE

–plays CD tracks in random order.

MUTE

–interrupts and resumes sound reproduction.

SLEEP

– activates/deactivates or selects the sleeper time.

TIMER ON / OFF

–activates/deactivates the timer function.

Notes for remote control:

– First select the source you wish to control

by pressing one of the source select keys on

the remote control (for example CD,

TUNER).

– Then select the desired function (for

example

1-8

PREP ARATIONS AND CONTROLS

Important notes for users in the

U.K.

Mains plug

This apparatus is fitted with an approved 13

Amp plug. To change a fuse in this type of plug

proceed as follows:

Remove fuse cover and fuse.

Fix new fuse which should be a BS1362 5 Amp,

A.S.T.A. or BSI approved type.

Refit the fuse cover.

If the fitted plug is not suitable for your socket

outlets, it should be cut off and an appropriate

plug fitted in its place.

If the mains plug contains a fuse, this should

have a value of 5 Amp. If a plug without a fuse

is used, the fuse at the distribution board

should not be greater than 5 Amp.

Note: The severed plug must be disposed of to

avoid a possible shock hazard should it be

inserted into a 13 Amp socket elsewhere.

How to connect a plug

The wires in the mains lead are coloured with

the following code: blue = neutral (N),

brown = live (L).

¶ As these colours may not correspond with the

colour markings identifying the terminals in

your plug, proceed as follows:

– Connect the blue wire to the terminal

marked N or coloured black.

– Connect the brown wire to the terminal

marked L or coloured red.

–Do not connect either wire to the earth

terminal in the plug, marked E (or e) or

coloured green (or green and yellow).

Before replacing the plug cover, ma ke cer tain

that the cord grip is clamped over the sheath

of the lead - not simply over the two wires.

Recording and playback of material may

require consent. See Copyright Act 1956 and

The Performer’s Protection Acts 1958 to 1972.

Norge

Typeskilt finnes på apparatens underside.

Observer: Nettbryteren er sekundert

innkoplet. Den innebygde netdelen er

derfor ikke frakoplet nettet så lenge

apparatet er tilsluttet nettkontakten.

For å redusere faren for brann eller elektrisk

støt, skal apparatet ikke utsettes for regn eller

fuktighet.

Italia

DICHIARAZIONE DI CONFORMITA ’

Si dichiara che l’apparecchio MC-320 Philips

risponde alle prescrizioni dell’ar t. 2 comma 1 del

D.M. 28 Agosto 1995 n. 548.

Fatto a Eindhoven

Philips Consumer Electronics

Philips, Glaslaan 2

5616 JB Eindhoven, The Nether lands

CAUTION

Use of controls or adjustments or

performance of procedures other than

herein may result in hazardous

radiation exposure or other unsafe

operation.

1-9

PREP ARATIONS AND CONTROLS

Cleaning the Cabinet

Use a soft cloth slightly moistened with a mild

detergent solution. Do not use a solution

containing alcohol, spirits, ammonia or abrasives.

Cleaning Discs

When a disc becomes dirty,

clean it with a cleaning cloth.

Wipe the disc from the centre

out.

Do not use solvents such as

benzene, thinner, commercially

available cleaners, or antistatic

spray intended for analogue records.

Cleaning the disc lens

After prolonged use, dirt or dust may

accumulate at the disc lens. To ensure good

playback quality, clean the disc lens with Philips

CD Lens Cleaner or any commercially available

cleaner. Follow the instructions supplied with

cleaner.

Cleaning the Heads and the Ta pe Paths

To ensure good recording and playback quality,

clean the heads

, the capstan(s)

, and

pressure roller(s)

after every 50 hours of

tape operation.

Caution: Do not rotate the heads during

cleaning.

Use a cotton swab slightly moistened with

cleaning fluid or alcohol.

You can also clean the heads by playing a

cleaning tape once.

Demagnetising the heads

Use a demagnetising tape available at your

dealer.

Maintenance

WARNING

Under no circumstances should you try to repair the system yourself, as this will invalidate the

warranty. Do not open the system as there is a risk of electric shock.

If a fault occurs, first check the points listed below before taking the system for repair. If you

are unable to remedy a problem by following these hints, consult your dealer or service center.

Problem Solution

CD OPERATION

“NO DISC” is displayed. –Insert a disc.

– Check if the disc is inserted upside down.

–Wait until the moisture condensation at the lens

has cleared.

– Replace or clean the disc, see “Maintenance”.

– Use a finalised CD-RW or CD-R.

Tr oubleshooting

RADIO RECEPTION

Radio reception is poor. – If the signal is too weak, adjust the antenna or

connect an external antenna for better reception.

–Increase the distance between the Micro HiFi

System and your TV or VCR.

TAPE OPERATION / RECORDING

Recording or playback cannot be made. –Clean deck parts, see “Maintenance”.

–Use only normal (IEC I) tape for recording.

“CHECK TAPE” is displayed. – Apply a piece of adhesive tape over the missing

tab space.

The tape deck door cannot open. –Remove and reconnect the AC pow er plug and

switch on the system again.

GENERAL

The system does not react when buttons – Remove and reconnect the AC power plug and

are pressed. switch on the system again.

Sound cannot be heard or is of poor – Adjust the volume.

quality. –Disconnect the headphones.

– Check that the speakers are connected correctly.

– Check if the stripped speaker wire is clamped.

The left and right sound outputs are – Check the speaker connections and location.

reversed.

The remote control does not function – Select the source (CD or TUNER, for example)

properly. before pressing the function button (

– Reduce the distance between the remote control

and the system.

– Inser t the battery with its polarities

(+/– signs) aligned as indicated.

– Replace the batter y.

–Point the remote control directly toward

IR sensor on the front of the system.

The timer is not working. –Set the clock correctly.

–Press TIMER ON / OFF to switch on the timer.

– If a recording is in progress, stop the recording.

The Clock/Timer setting is erased. –Power has been interrupted or the power cord

has been disconnected. Reset the clock/timer.

Tr oubleshooting

1-10

DISASSEMBLY INSTRUCTIONS

A. To remove Brand Rim Left & Right B. To remove Top Cabinet C. To remove Bottom Cabinet D. To remove Tape Deck E. To remove Left & Right Metal Side Bars F.

To remove CD Bracket G. To remove Rear Cabinet H. To remove CD MCU Board I. To remove CD Tray Cover J. To remove Connection Board & CD Deck K. To remove CD Door & Key Board L. To remove Main Board M. To remove Power Board N. To remove Tuner Board

2-1

B1 (x4)

B2 (x4)

D1 (x4)

G2 (x2)

G3 (x2)

E1 (x2)

G4 (x2)

K1 (x4)

I1 (x4)

J1 (x1)

F1 (x2)

H1 (x4)

L1 (x2)

C1 (x4)

L2 (x1)

F2 (x1)

G5 (x2) Only for /21

G1 (x3)

M1 (x4)

N1 (x1)

E2 (x2)

C1 (x4)

2-2

SET BLOCK DIAGRAM

3-1

AM ANT

FM RF

AUX

R SUPPLY

AM OSC

IC 101

TA2149BN

OSC

AM IF

PLL

9257F

TU-L

TU-

MCU

TMP87EP26F

TO CASS DECK

TDA T468D

FUNCTION IC

TO POWER

PRE-AMP

NJM4556AM

LCD DRIVE IC

HT1622

HEADPHONE OUT

POWER

AMP

AN17830A

LCD

SPK

VCC SW

CASSETT

DECK

BA316N

TA2153FN

DRIVE IC

OSC

TA2092N

TA 8142AP

85KHZ

P/B-R

P/B-

REC-L

REC-R

DSP

TC9462F

CD-R

CD-L

STP16

N10

D602

+6V L7806

+12V KA7812

D603

:8V

POWER

:16V

SUPPLY

+ CD 8V

SET WIRING DIAGRAM

4-1 4-1

5-1

KEY BOARD

Block Diagram

O S C I

D A T A

5-1

HT1622

D i s p l a y R A M

C S

R D

W R

C o n t r o l

a n d T i m i n g C i r c u i t

L C D D r i v e r / B i a s C i r c u i t

C O M 0

C O M 7

S E G 0

IC Block Diagram ........................................................................ 5-1

Circuit Diagram ........................................................................... 5-2

Layout Diagram-Component ...................................................... 5-3

Layout Diagram-SMD ................................................................. 5-3

Electrical parts list ...................................................................... 5-4

Pin Assignment

V D D

V S S

S E G 3 1

V L C D

B Z

C S

N C

R D

W R

D A T A

V S S

O S C I

V D D

V L C D

I R Q

B Z

N C

B Z

C O M 0

C O M 1

N C

T o n e F r e q u e n c y

T 1

T 2

T 3

G e n e r a t o r

S E G 3 0

S E G 3 1

6 3

6 4

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 0

2 1

1 9

S E G 2 8

S E G 2 9

6 1

6 2

2 3

2 2

W a t c h d o g T i m e r

T i m e B a s e G e n e r a t o r

S E G 2 3

S E G 2 4

S E G 2 5

S E G 2 6

S E G 2 7

5 6

5 7

5 8

5 9

6 0

0 6  $

   $ "  3 . 2

2 4

2 5

2 6

2 7

2 8

a n d

S E G 2 0

S E G 2 1

S E G 2 2

N C

5 2

5 3

5 4

5 5

5 1 5 0

4 9 4 8

4 7

4 6

4 5

4 4

4 3

4 2

4 1

4 0

3 9

3 8

3 7

3 6

3 5

2 9

3 4

3 0

3 1

3 2

3 3

I R Q

N C

N C S E G 1 9

S E G 1 8

S E G 1 7

S E G 1 6

S E G 1 5

S E G 1 4

S E G 1 3

S E G 1 2

S E G 1 1

S E G 1 0

S E G 9

S E G 8

S E G 7

N C

C O M 5

C O M 2

C O M 3

C O M 4

C O M 6

C O M 7

S E G 0

S E G 1

S E G 2

S E G 3

S E G 4

S E G 5

S E G 6

2 January 10, 2001

CIRCUIT DIAGRAM - FRONT BOARD

5-2

+ 36 hidden pages

Philips MC-320 Service manual

TABLE OF CONTENTS

LOCATION OF PRINTED CIRCUIT BOARDS

VERSION VARIATIONS

SPECIFICATIONS

MEASUREMENT SETUP

SERVICE AIDS

PREP ARATIONS AND CONTROLS

DISASSEMBLY INSTRUCTIONS

SET BLOCK DIAGRAM

SET WIRING DIAGRAM

KEY BOARD

Block Diagram

TABLE OF CONTENTS

Pin Assignment

CIRCUIT DIAGRAM - FRONT BOARD