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Micro System MC230/05/21M/22/25/30
MC235B/05/12/37/79, MC235/37/79
TABLE OF CONTENTS
Page
Location of pc boards & Version variations ................ 1-2
Technical Specifications ............................................. 1-3
Measurement setup .................................................... 1-4
Service Aids, Safety Instruction, etc. .......................... 1-5
Disassembly Instructions & Service positions .............. 2
Service Test Programs ............................................... 3-1
Set Block diagram ...................................................... 4-1
Set Wiring diagram ..................................................... 5-1
Power Board .................................................................. 6
Key Board ...................................................................... 7
Main Board .................................................................... 8
Displsy Board ................................................................. 9
Set Mechanical Exploded view & parts list ................. 10
Revison List ................................................................. 11
CLASS 1
©
Copyright 2007 Philips Consumer Electronics B.V. Eindhoven, The Netherlands LASER PRODUCT
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 0712 Service Audio Printed in The Netherlands Subject to modification GB 3141 785 30023
Version 1.3
1-2
LOCATION OF PRINTED CIRCUIT BOARDS
KEY_B BOARD
HEADPHONE BOARD
DIS KEY_C BOARD
PLA
YB
OA
R D
SPEAKE
MA R BOAR
IN B
OA D
R D
KEY
_A
BO
AR
D
ARD
R BO
E
POW
FM/AM BOARD
VERSION VARIATIONS:
Type /Versions: MC230 MC235 MC235B
Features & /21 /22 /25 /30 /37 /79 /37 /79 /05 /12
Board in used:
Aux in / CDR in x x x x x x x x x x
Line Out
Video Out
Surround Out
Subwoofer Out
Power Booster Out
Digital Out
Digital in
Matrix Surround
RDS x x x x
News x x x x
Dolby Pro Logic (DPL)
Incredible Surround
Karaoke Features
Voltage Selector x
ECO Power Standby (LCD Display Off) x x x x
ECO6 Tuner Board - Systems Non-Cenelec x x x x x x
ECO6 Tuner Board - Systems Cenelec x x x x
USB PC LINK
1-3
SPECIFICATIONS
GENERAL:
Mains voltage : 120/240V ± 15% Switchable for /21 Input sensitivity
120V ± 10% for /37 Aux in (at 1kHz) : 500mV at 600
230V ± 10% for /22/25 Output sensitivity
240V ± 10% for /30 Headphone output at 32 ohm : 15mW ± 2dB (Max. vol.)
Mains frequency : 50/60Hz
Clock accuracy : < 4 seconds per day
Dimension centre unit : 250 x 245 x 96 (mm) COMPACT DISC:
Frequency response within ± 3dB : 63Hz - 14kHz
Power consumption Output level (in Vrms) : 500mV, Zout = 100
Active : 15W for /21/22/25/37/30 Signal/Noise ratio (A-weighted) : > 67dBA
Standby : < 6W (DEMO mode off) Distortion at 1kHz : < 0.02%
ECO Power Standby : < 1W for /22/25 Channel unbalance at 1kHz : < ±2dB
Channel separation at 1kHz : > 30dB
Emphasis : 15/50 µS (switched
TUNER: automatically by CD10)
FM THD Noise(1kHz) : < 1.5%
Tuning range : 87.5-108MHz Outband Attenuation : > 35dB
Grid : 50kHz
100kHz for /21/37
IF frequency : 10.7MHz ± 20kHz
Aerial input : 75 coaxial [....] Values indicated are for /22/25 only.
300 for /37
Sensitivity at 26dB S/N : < 22dBf
Selectivity at 300kHz bandwidth : > 33dB
Image rejection : > 20dB [> 25dB]
Distortion at RF=1mV, dev. 75kHz : < 3%
-3dB Limiting point : < 23.5dB
Crosstalk at RF=1mV, dev. 40kHz : > 26dB
MW
Tuning range : 531-1602kHz
530-1700kHz for /21/37
Grid : 9kHz
10kHz for /21/37
IF frequency : 450kHz ± 1kHz
Aerial input : Frame aerial 18.1µH
Sensitivity at 26dB S/N : < 4.0mV/M
[> 3.25mV/M]
Selectivity at 300kHz bandwidth : > 20dB
IF rejection : > 24dB
Image rejection : > 20dB [> 28 dB]
Distortion at RF=50mV, M=80% : < 5%
AMPLIFIER:
Output power
L&R : 2 x 5W FTC (4, 1kHz, 10% THD)
Frequency response within -3dB : 60Hz-14kHz
Digital Sound Control (DSC) : Jazz / Rock / Pop / Classic
Dynamic Bass Boost (DBB) : Jazz / Rock / Pop / Classic
1-4
MEASUREMENT SETUP
Tuner FM
Bandpass
DUT 250Hz-15kHz LF Voltmeter
e.g. 7122 707 48001 e.g. PM2534
RF Generator
e.g. PM5326
Ri=50
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)
Bandpass
250Hz-15kHz LF Voltmeter
DUT e.g. 7122 707 48001 e.g. PM2534
RF Generator
e.g. PM5326
S/N and distortion meter
e.g. Sound Technology ST1700B
Ri=50
Frame aerial
e.g. 7122 707 89001
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).
CD Recorder
Use Audio Signal Disc SBC429 4822 397 30184 Use Universal Test Cassette CrO2 SBC419 4822 397 30069
(replaces test disc 3) or Universal Test Cassette Fe SBC420 4822 397 30071
DUT
DUT LF Generator L
L e.g. PM5110
R
R
S/N and distortion meter
S/N and distortion meter e.g. Sound Technology ST1700B
e.g. Sound Technology ST1700B
LEVEL METER
LEVEL METER e.g. Sennheiser UPM550
e.g. Sennheiser UPM550 with FF-filter
with FF-filter
1-5
SERVICE AIDS
Service Tools: ESD Equipment:
Universal Torx driver holder .................................. 4822 395 91019 Anti-static table mat - large 1200x650x1.25mm ... 4822 466 10953
Torx bit T10 150mm ............................................. 4822 395 50456 Anti-static table mat - small 600x650x1.25mm ..... 4822 466 10958
Torx driver set T6 - T20 ......................................... 4822 395 50145 Anti-static wristband .............................................. 4822 395 10223
Torx driver T10 extended ...................................... 4822 395 50423 Connector box (1M) ............................................ 4822 320 11307
Extension cable
Cassette: (to connect wristband to conn. box) .................. 4822 320 11305
SBC419 Test cassette CrO2 ................................. 4822 397 30069 Connecting cable
SBC420 Test cassette Fe ..................................... 4822 397 30071 (to connect table mat to conn. box) .................. 4822 320 11306
MTT150 Dolby level 200nWb/M ............................ 4822 397 30271 Earth cable (to connect product to mat or box) .... 4822 320 11308
Complete kit ESD3
Compact Disc: (combining all above products) ......................... 4822 320 10671
SBC426/426A Test disc 5 + 5A ............................ 4822 397 30096 Wristband tester .................................................... 4822 344 13999
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
1-6
NL WAARSCHUWING
GB WARNING ESD
Alle IC's en vele andere halfgeleiders zijn
All ICs and many other semi-conductors are gevoelig voor electrostatische ontladingen
susceptible to electrostatic discharges (ESD). (ESD).
Careless handling during repair can reduce life Onzorgvuldig behandelen tijdens reparatie kan
drastically. de levensduur drastisch doen verminderen.
When repairing, make sure that you are Zorg ervoor dat u tijdens reparatie via een
connected with the same potential as the mass polsband met weerstand verbonden bent met
of the set via a wrist wrap with resistance. hetzelfde potentiaal als de massa van het
Keep components and tools also at this apparaat.
potential. Houd componenten en hulpmiddelen ook op
ditzelfde potentiaal.
F ATTENTION
I AVVERTIMENTO
Tous les IC et beaucoup d'autres D WARNUNG
semi-conducteurs sont sensibles aux Tutti IC e parecchi semi-conduttori sono
décharges statiques (ESD). sensibili alle scariche statiche (ESD).
Alle ICs und viele andere Halbleiter sind
Leur longévité pourrait être considérablement La loro longevità potrebbe essere fortemente
empfindlich gegenüber elektrostatischen
écourtée par le fait qu'aucune précaution n'est ridatta in caso di non osservazione della più
Entladungen (ESD).
prise à leur manipulation. grande cauzione alla loro manipolazione.
Unsorgfältige Behandlung im Reparaturfall kan
Lors de réparations, s'assurer de bien être relié Durante le riparazioni occorre quindi essere
die Lebensdauer drastisch reduzieren.
au même potentiel que la masse de l'appareil et collegato allo stesso potenziale che quello della
Veranlassen Sie, dass Sie im Reparaturfall über
enfiler le bracelet serti d'une résistance de massa dell'apparecchio tramite un braccialetto
ein Pulsarmband mit Widerstand verbunden
sécurité. a resistenza.
sind mit dem gleichen Potential wie die Masse
Veiller à ce que les composants ainsi que les Assicurarsi che i componenti e anche gli utensili
des Gerätes.
outils que l'on utilise soient également à ce con quali si lavora siano anche a questo
Bauteile und Hilfsmittel auch auf dieses gleiche
potentiel. potenziale.
Potential halten.
GB
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified, CLASS 1
be used
Safety components are marked by the symbol ! . LASER PRODUCT
NL
Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in
zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen, GB Warning !
identiek aan de gespecificeerde, worden toegepast.
De Veiligheidsonderdelen zijn aangeduid met het symbool !
Invisible laser radiation when open.
Avoid direct exposure to beam.
F
Les normes de sécurité exigent que l'appareil soit remis à l'état
S Varning !
d'origine et que soient utiliséés les piéces de rechange identiques
à celles spécifiées. Osynlig laserstrålning när apparaten är öppnad och spärren
Less composants de sécurité sont marqués !
är urkopplad. Betrakta ej strålen.
SF Varoitus !
D
Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina
beachten. Der Original zustand des Geräts darf nicht verändert werden; näkymättömälle laserisäteilylle. Älä katso säteeseen!
für Reparaturen sind Original-Ersatzteile zu verwenden.
Sicherheitsbauteile sind durch das Symbol ! markiert.
DK Advarse !
I Usynlig laserstråling ved åbning når sikkerhedsafbrydere er
Le norme di sicurezza esigono che l'apparecchio venga rimesso ude af funktion. Undgå udsaettelse for stråling.
nelle condizioni originali e che siano utilizzati i pezzi di ricambio
identici a quelli specificati.
Componenty di sicurezza sono marcati con !
GB F
After servicing and before returning set to customer perform a leakage "Pour votre sécurité, ces documents doivent être utilisés par
current measurement test from all exposed metal parts to earth ground to des spécialistes agréés, seuls habilités à réparer votre
assure no shock hazard exist. The leakage current must not exceed appareil en panne".
0.5mA.
Preparations Preparations
FM Antenna Before using the remote control
1 Pull out the plastic protective sheet.
2 Select the source you wish to control by
MW loop FM wire antenna pressing one of the source select keys on the
antenna remote control (for example CD, TUNER).
3 Then select the desired function (for example
Å
É , í , ë).
For better FM stereo reception, connect an
outdoor FM antenna to the FM AERIAL (FM plastic
ANTENNA) terminal.
Speakers Speakers protective
C Speakers Connection sheet
(right) (left) Front Speakers
Connect the speaker wires to the SPEAKERS
terminals, right speaker to "RIGHT" and left
VOLTAGE
SELECTOR
110V-
127V
220V-
speaker to "LEFT", colored (marked) wire to
240V
NOT FOR ALL
VERSIONS
PREPARATIONS AND CONTROLS
"+" and black (unmarked) wire to "-".
Replacing battery (lithium
AC power cord Fully insert the stripped portion of the speaker CR2025) into the remote control
1-7
wire into the terminal as shown. 1 Pull out the knob A slightly to the left.
Notes:
For optimal sound performance, use the 2 Pull out the battery compartment B .
supplied speakers. 3 Replace a new battery and fully insert the
Rear connections B Antennas Connection battery compartment back to the original
Do not connect more than one speaker to any
The type plate is located at the rear of the Connect the supplied MW loop antenna and FM one pair of +/- speaker terminals. position.
system. antenna to the respective terminals. Adjust the Do not connect speakers with an impedance
position of the antenna for optimal reception. lower than the speakers supplied. Please refer to
A Power the SPECIFICATIONS section of this manual.
MW Antenna
Before connecting the AC power cord to the
wall outlet, ensure that all other connections Optional connection
have been made. The optional equipment and connecting cords
If your system is equipped with a Voltage are not supplied. Refer to the operating
Selector, set the VOLTAGE SELECTOR to the instructions of the connected equipment for
local power line voltage. details.
WARNING!
Connecting other equipment to your
For optimal performance, use only the system
original power cable. Connect the audio left and right OUT terminals
Never make or change any connections of a TV, VCR, Laser Disc player, DVD player or
with the power switched on. CD Recorder to the AUX-IN terminals.
To avoid overheating of the system, a safety
Note:
circuit has been built in. Therefore, your If you are connecting equipment with a mono
system may switch to Standby mode output (a single audio out terminal), connect it to
automatically under extreme conditions. If the AUX left terminal. Alternatively, you can use a CAUTION!
this happens, let the system cool down Position the antenna as far as possible from a TV, "single to double" cinch cable (the output sound Batteries contain chemical substances, so
before reusing it (not available for all versions). VCR or other radiation source. still remain mono). they should be disposed off properly.
Controls
Controls on the system and ^ RDS.NEWS
activates RDS news and Traffic Announcement.
remote control
1 for tuner, displays RDS information.
1 STANDBY-ON/ ECO POWER & MUTE
! 3 switches the system on or to Eco Power standby. interrupts and resumes sound reproduction.
2 Display * REPEAT
5 shows the status of the system. repeats a track/ CD programme/ entire CD.
3 OPEN · CLOSEç ( SHUFFLE
7 opens/ closes the CD door. plays CD tracks in random order.
4 IR )
@ # remote sensor connects headphones
5 VOLUME (3 / 4 ) (+/-)
0 $ adjusts the volume level.
6 CD Door
8 & 7 Mode Selection
% ^ SEARCH/ TUNE (à / á)
PREPARATIONS AND CONTROLS
for TUNER ........ tunes to a station
* ( for CD ................. fast searches back and forward
within a track/ CD.
STOP 9 ............ stops CD playback or erase a
CD programme.
Å
PLAYÉ ...... starts or interrupts playback.
) PRESET (¡ / TM)
1-8
for TUNER ........ selects a preset radio station.
for CD ................. skips to the beginning of a
current track/ previous/
subsequent track
2 8 DBB (Dynamic Bass Boost)
1
5 enhances the bass.
3 9 BAND
4 selects a waveband.
0 PROGRAM
for CD ................. programmes tracks and reviews
the programme.
for TUNER ........ programmes tuner stations.
6 ! SOURCE
selects the respective sound source for CD/
TUNER/ AUX.
@ CLOCK SET
sets the clock function.
7 views the clock. Notes for remote control:
# TIMER First select the source you wish to control
8 ! activates/ deactivates or sets the timer function by pressing one of the source select keys on
$ SLEEP the remote control (for example CD,
activates/deactivates or selects the sleeper time. TUNER).
9 0 % DSC (Digital Sound Control) Then select the desired function (for
selects sound characteristics: ROCK/ JAZZ/ Å,
example É ¡ , TM).
POP/ CLASSIC.
Important notes for users in the Italia
U.K.
DICHIARAZIONE DI CONFORMITA'
Mains plug
Si dichiara che l'apparecchio MC230, MC235
This apparatus is fitted with an approved 13
Philips risponde alle prescrizioni dell'art. 2
Amp plug. To change a fuse in this type of plug
comma 1 del D.M. 28 Agosto 1995 n. 548.
proceed as follows:
1 Remove fuse cover and fuse. Fatto a Eindhoven
2 Fix new fuse which should be a BS1362 5 Amp, Philips Consumer Electronics
A.S.T.A. or BSI approved type. Philips, Glaslaan 2
3 Refit the fuse cover. 5616 JB Eindhoven, The Netherlands
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 Norge
is used, the fuse at the distribution board Typeskilt finnes på apparatens underside.
PREPARATIONS AND CONTROLS
should not be greater than 5 Amp.
Observer: Nettbryteren er sekundert
Note: The severed plug must be disposed of to innkoplet. Den innebygde netdelen er
avoid a possible shock hazard should it be derfor ikke frakoplet nettet så lenge
inserted into a 13 Amp socket elsewhere. apparatet er tilsluttet nettkontakten.
How to connect a plug For å redusere faren for brann eller elektrisk
The wires in the mains lead are coloured with
1-9
støt, skal apparatet ikke utsettes for regn eller
the following code: blue = neutral (N), fuktighet.
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. CAUTION
Connect the brown wire to the terminal Use of controls or adjustments or
marked L or coloured red. performance of procedures other than
Do not connect either wire to the earth
herein may result in hazardous
terminal in the plug, marked E (or e) or
coloured green (or green and yellow). radiation exposure or other unsafe
operation.
Before replacing the plug cover, make certain
that the cord grip is clamped over the sheath
of the lead - not simply over the two wires. VAROITUS
Muiden kuin tässä esitettyjen
Copyright in the U.K.
toimintojen säädön tai asetusten
Recording and playback of material may
require consent. See Copyright Act 1956 and muutto saattaa altistaa vaaralliselle
The Performer's Protection Acts 1958 to 1972. säteilylle tai muille vaarallisille
toiminnoille.
Troubleshooting
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 Philips for help.
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.
PREPARATIONS AND CONTROLS
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.
1-10
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 (É Å,í,
ë).
Reduce the distance between the remote control
and the system.
Insert the battery with its polarities
(+/ signs) aligned as indicated.
Replace the battery.
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 to switch on the timer.
The Clock/Timer setting is erased. Power has been interrupted or the power cord
has been disconnected. Reset the clock/timer.
2-1 2-1
DISMANTLING INSTRUCTIONS DISMANTLING INSTRUCTIONS
Dismantling of the Rear Portion Dismantling of the Front Boards and CD Door Repair Hints & Service Positions
Note: The flex cables are very fragile, care should be taken
1) Remove 11 screws A and B as indicated to remove the 1) Loosen 3 screws G each to remove the CD Mechanism not to damage them during repair. After repair, be
Rear Cabinet. Holder Bracket. very sure that the flex cables are inserted properly
2) Remove 2 screws C as indicated to loosen the Speaker into the flex sockets before encasing, otherwise faults
Wire Holder. 2) Loosen 7 screws F1 and F2 as indicated to remove the may occurs.
3) Remove 2 screws D as indicated to loosen the Speaker Main Board.
Board . Service position A Service position B
4) Remove 2 screws E as indicated to loosen the AUX IN 3) Remove 3 screws H as indicated to loosen the Gear Motor
jack. Module.
4) Loosen 4 screws I (see Figure 3) to remove the Key_C
Board.
5) Loosen 2 screws J (see Figure 3) to remove the Display
Board.
Figure 4
Figure 5
Figure 1
Figure 3
6) Loosen 4 screws K (see Figure 3) to remove the Key_B
Service position C
Board.
7) Loosen 8 screws L (see Figure 3) to remove the Key_A
Board.
8) Loosen 8 screws M (see Figure 3) to remove the Door Eject
Lever Bracket Right/Left, then remove CD door.
Figure 2
Figure 6
3-1 3-1
SERVICE TEST PROGRAM
To start service test program
PLAY & SOURCE
depressed while
plugging in the mains cord
Display shows the
ROM version VER refers to Version
"VER XXX"
(Main menu) XXX refers to Software version number of the uProcessor
(counting up from 010 to 999)
KEY COMPACT DISC REMOTE CONTROL ERASE THE DISPLAY
TEST TEST KEY TEST EEPROM TEST
N N VOLUME- N
VOLUME+ PROGRAM
Button pressed? Button pressed? Button pressed?
Y Y Y
Display shows
Note : Disc should be available on the tray before entering the Service Test Mode.
"Key" Display shows all display
MESSAGE R-C Key DISPLAY REMARK
Display shows "EP CLR" segments and switch all
KEY DISPLAY ACTION
LEDs on.
OKAY ERROR
POWER 12
Any N
NEXT MOTOR 1 - - Disc motor turns clockwise, motor power 50%.
Button pressed? CD 63
N VOLUME- N
PREV MOTOR 2 - Disc motor turns counter clockwise, motor power 50% TUNER 63 PROGRAM
- Button pressed?
Button pressed?
AUX 63
The corresponding codes SLE OUT - - Slide moves outside. Y Y
OPEN*CLOSE 45
according to Table 1 will be
displayed
DBB 70
SLE IN - - Slide moves inside. Display shows alternate
PROG 36 display segments & switch
alternate LEDs on.
STOP - - - Exit to main menu.
REPEAT 29
STOP N
Button pressed? SHUFFLE 26
PLAY FOCUS - - Enter focus servo test. N
STOP
PLAY 53 Button pressed?
Y
VOL+ 16
Y
VOL- 17
MUTE 13
RDS * NEWS 15
Main Set Key DISPLAY 52
STANDBY-ON 32 50
OPEN*CLOSE 29 PREVIOUS( ) 33
SOURCE- 11 NEXT ( ) 32
DBB 17 STOP "VER XXX" Exit to main menu
BAND 10 CLOCK SET 42
PROGRAM 14 TIMER 89
18 SLEEP 38
19
Note : In Key test mode, if a key on the remote control is pressed,
PLAY 20 the display shows its corresponding code in track area.
VOLUME+ 24
VOLUME- 23
PREVIOUS( ) 12
NEXT ( ) 13
Table 1
4-1 4-1
SET BLOCK DIAGRAM
5-1 5-1
SET WIRING DIAGRAM
6-1 6-1
POWER BOARD
TABLE OF CONTENTS
Circuit Diagram ................................................................ 6-2
PCB Layout ....................................................................6-3
6-2 6-2
CIRCUIT DIAGRAM
6-3 6-3
LAYOUT DIAGRAM - POWER BOARD LAYOUT DIAGRAM - POWER BOARD
COMPONENT SIDE SMD SIDE
7-1 7-1
KEY BOARD
TABLE OF CONTENTS
Circuit Diagram ........................................................................... 8-2
Layout Diagram-Component ...................................................... 8-3
Layout Diagram-SMD ................................................................. 8-3
Layout Diagram-Component ...................................................... 8-4
Layout Diagram-SMD ................................................................. 8-4
7-2 7-2
CIRCUIT DIAGRAM - FRONT BOARD
7-3 7-3
LAYOUT DIAGRAM - KEY_A BOARD LAYOUT DIAGRAM - KEY_B BOARD
COMPONENT SIDE COMPONENT SIDE
LAYOUT DIAGRAM - KEY_A BOARD LAYOUT DIAGRAM - KEY_B BOARD
SMD SIDE SMD SIDE
7-4 7-4
LAYOUT DIAGRAM - KEY_C BOARD
COMPONENT SIDE
LAYOUT DIAGRAM - KEY_C BOARD
SMD SIDE
8-1 8-1
SOUND FADER CONTROL CIRCUIT
TEA6321
MAIN BOARD
TABLE OF CONTENTS
IC Block Diagram ........................................................................ 8-1
Circuit Diagram-Main Part .......................................................... 8-2
Component Layout - Main PCB ................................................. 8-3
SMD Layout - Main PCB ............................................................ 8-4
Layout - Headphone PCB .......................................................... 8-5
IC Block Diagram ........................................................................ 8-5
8-2 8-2
MAIN BOARD - CIRCUIT DIAGRAM
MCU & AMP. PART
8-3 8-3
MAIN BOARD - CIRCUIT DIAGRA