Philips FW-V795/21M User manual

GB
CLASS 1
LASER PRODUCT
ServiceManual
Service
Service
Service
Service
Service
FW-V795/21M
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 .....................................................4-2
Front Control Board .......................................................5
Front Display Board.......................................................6
ECO6 Tuner Board : Systems Non-Cenelec.............. 7A
VCD-MPEG-01B Module...............................................8
ETF7 ND Tape Module ..................................................9
3CDC-LC-VCD Module ...............................................10
P2002 100W VCD Module .......................................... 11
AF10 Board..................................................................12
VCD GND Isolator Board ............................................13
Set Mechanical Exploded view & parts list .................14
©Copyright 2002 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 BB 0219 Service Audio Printed in The Netherlands Subject to modification
Mini System
3139 785 30065
Version 1.0

HEADPHONE
BOARD
ETF7
BOARD
MAINS
BOARD
L/R AMP. & SUPPLY
BOARD
MAINS SOCKET
BOARD
TUNER
BOARD
VIDEO OUT
CINCH BOARD
KEY-CDC BOARD
KARAOKE
BOARD
FRONT
DISPLAY
BOARD
IR-EYE
BOARD
VU
METER
BOARD
FRONT
CONTROL
BOARD
VCD GND
ISOLATOR BOARD
AF10
BOARD
CD
BOARD
1-2
LOCATIONOFPRINTEDCIRCUITBOARDS
/21M
Aux in /CDR in x
Line Out
Surround Out
Subwoofer Out
Digital Out
Video Out x
Booster Out x
Matrix Surround
CD Text
Dolby B
RDS
News
Dolby Pro Logic (DPL)
Incredible Surround x
Karaoke Features x
Voltage Selector x
ECO Power Standby (Clock Display Off) x
ECO6 Tuner Board - Systems Non-Cenelec x
ECO6 Tuner Board - Systems Cenelec
Center/Surround Channel
Power Booster (PWB-V795/01) x
VERSION VARIATIONS:
Type /Versions: FW-V795
Features &
Board in used:

1-3
SPECIFICATIONS
GENERAL:
Mains voltage : 110-127V / 220-240V Switchable
Mains frequency : 50/60Hz
Power consumption : < 1W at ECO Power Standby
: 25W at Standby (DEMO mode off)
: 175W at Active
Clock accuracy : < 4 seconds per day
Dimension centre unit : 265 x 310 x 390mm
TUNER:
FM
Tuning range : 87.5-108MHz
Grid : 50kHz
IF frequency : 10.7MHz ±25kHz
Aerial input : 75Ωcoaxial
Sensitivity at 26dB S/N : < 7µV
Selectivity at 600kHz bandwidth : > 25dB
Image rejection : > 25dB
Distortion at RF=1mV, dev. 75kHz : < 3%
-3dB Limiting point : < 8µV
Crosstalk at RF=1mV, dev. 40kHz : > 18dB
MW
Tuning range : 531-1602kHz/530-1700kHz
Grid : 9kHz / 10kHz
IF frequency : 450kHz ±1kHz
Aerial input : Frame aerial
Sensitivity at 26dB S/N : < 4.0mV/M
Selectivity at 18kHz bandwidth : > 18dB
IF rejection : > 45dB
Image rejection : > 28dB
Distortion at RF=50mV, m=80% : < 5%
AMPLIFIER:
Output power (6Ω, 1kHz, 10% THD)
L & R : 2 x 120W RMS
Frequency response within -3dB : 50Hz-20kHz
Incredible Surround : ON/OFF
WOOX : Level 1, 2, 3 & OFF
Digital Sound Control (DSC) : Digital, Rock, Pop,
Newage,Classic,Electric
Virtual Ambience Control (VAC): Hall, Concert, Cinema,
Disco, Arcade, Cyber
Input sensitivity Aux in : 500mV ±3dB at 1kHz
CDR in : 1V ±3dB at 1kHz
Microphone : 3.5mV at 600Ω
Output sensitivity
Booster out (Classic Mode) : 900mVat22kΩ(Vol.Max.)
Headphone output at 32Ω: 700mV ±1dB (Vol. Max.)
CASSETTE RECORDER:
Number of track : 2 x 2 stereo
Tape speed : 4.76 cm/sec ±2%
Wow and flutter : < 0.4% DIN
Fast-wind/Rewind time C60 : 130 sec
Bias system : 78kHz ±10kHz
Rec/Pb frequency response within 8dB: 80Hz - 10kHz
Signal to Noise Ratio (Type I) : > 48dBA
VIDEO CD
Audio Performance:
Measurement done at output conn. of the CDC module.
Frequency response within ±3dB : 20Hz - 20kHz
Output level (in Vrms) : 500mV, Zout = 100Ω
Signal/Noise ratio (A-weighted): > 80dBA
Distortion at 1kHz : < 0.02%
Channel unbalance at 1kHz : < 1dB
Channel separation at 1kHz : > 60dB
De-emphasis : 0 or 15/50 mS (Switched
by subcode on the disc)
MP3-CD bit rate : 32 - 256kbps
Sampling Frequencies : 48kHz, 44.1kHz, 32kHz
Video Performance:
Video output level : 1 ±0.2Vp-p
Luminance non-linear distortion : 0 ±5%
Luminance S/N ratio : > 50dB

1-4
LF Generator
e.g. PM5110
Recorder
Use Universal Test Cassette CrO2 SBC419 4822 397 30069
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter
e.g. Sound Technology ST1700B
L
R
DUT
or Universal Test Cassette Fe SBC420 4822 397 30071
LEVEL METER
e.g. Sennheiser UPM550
with FF-filter
S/N and distortion meter
e.g. Sound Technology ST1700B
L
R
DUT
CD
Use Audio Signal Disc
(replaces test disc 3) SBC429 4822 397 30184
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 250Hz) to eliminate hum (50Hz, 100Hz).
RF Generator
e.g. PM5326
Ri=50Ω
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
Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).
Ri=50Ω
Tuner FM
MEASUREMENT SETUP

SERVICE AIDS
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
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
1-5
HANDLING CHIP COMPONENTS

GB
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.
F
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.
ESD
D
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.
NL
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.
I
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.
“Pour votre sécurité, ces documents
doivent être utilisés par des spécia-
listesagréés,seulshabilitésàréparer
votre appareil en panne”.
GB
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified,
be used.
NL
Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in
zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen,
identiek aan de gespecificeerde, worden toegepast.
F
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.
D
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.
I
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."
CLASS 1
LASER PRODUCT
3122 110 03420
GB
Warning !
Invisible laser radiation when open.
Avoid direct exposure to beam.
S
Varning !
Osynlig laserstrålning när apparaten är öppnad och spärren
är urkopplad. Betrakta ej strålen.
SF
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.
1-6

P
M
C3
3. Lift up and out 1. Place screw driver
(flat side) between
the cassette cover
& cassette door
2. Twist screw driver
DISMANTLING INSTRUCTIONS
Dismantling of the Cassette Cover
1) Loosen4screwsto removetheCoverTop(pos255)ofthe
set.
2) Loosen 3 screws to remove the Panel Left (pos 253) and
3 screws to remove the Panel Right (pos 254) of the set.
3) SlideouttheCDCTrayasshowninthediagrambelowwith
the help of a flat head screw driver.
CassetteCover
Remove Cassette Cover
Dismantling of the CDC Module and Front Panel Assembly
Remove CDC Module
4) Remove the Cover Tray VCD (pos 106) as indicated.
Front View CDC
Remove Cover Tray VCD
Dismantling of the CDC Module and Front Panel Assembly
Sliding out the CDC Tray
5) Loosen 2 screws A and 2 screws B to remove the CDC
Module (pos 1105) as indicated.
6) Remove 2 screws (pos 226) at the bottom to separate the
Front Panel Assembly from the Plate Bottom (pos 265).
2-1 2-1
Separating the MPEG and the CDC Module
1) Remove4screwsPtoremovetheMPEGshield&MPEG
Board.
2) Remove 2 screws M and uncatch C3 with a flat screw-
driver in the direction as shown to loosen the Plate
Insulator.

2-2 2-2
Dismantling of the ETF Tape Module
1) Remove6screwsG as indicatedtoloosentheETFTape
Module (pos 1104).
Dismantling of the Rear PortionDismantling of the Front Display Board and Front Control Board
1) Remove 1 screw C as indicated to loosen the VCD GND
Isolator Board (pos V1109).
2) Remove1screwC1asindicatedtoloosentheHeadphone
Board (pos 1101-B).
3) Remove 5 screws D as indicated to loosen the Front
Display Board (pos 1101-A).
4) Remove 9 screws E as indicated to loosen the Front
Control Board (pos 1107-A).
5) Remove 1 screw F as indicated to loosen the IR-Eye
Board (pos 1107-D).
6) Remove3 screws Nasindicated to loosentheVU Meter
Board (pos 1107-C).
1) The Knob Volume Gloss Black (pos 117) can be remove
by inserting a strong string into the slot and pull it out in
the direction as indicated. See picture 1.
2) The Knob Jog Rotary (pos 140) can be remove by
inserting a strong string into the slot and pull it out in the
direction as indicated. See picture 2.
Picture 1
Picture 2
Repair Hints
1) Remove 2 screws J and uncatch M1 as indicated to
loosen the AF Board (pos 1102-A).
2) Remove 1 screw R as indicated to loosen the Video Out
Cinch Board (pos V1102-B).
3) Remove 3 screws K and uncatch M2 as indicated to
loosen the Tuner Board (pos 1103).
4) Remove 4 screws L as indicated to loosen the Panel
Rear (pos 256).
RemoveAF Board
Remove VU Meter Board
Remove VCD GND Isolator Board, Headphone Board
and Front Display Board
Remove Front Control Board and IR-Eye Board

2-3 2-3
Service position D
Service position A
Service position C
Repair Hints
3) DuringrepairitispossibletodisconnecttheTunerBoard
(pos1103)andCDC & MPEGModule (pos 1105) unless
thefaultissuspectedtobeinthatarea. Thiswillnotaffect
the performance of the rest of the set.
4) Due to the short flex cable wires in the ETF Module, the
pc board should be disconnected and reconnected on
the reverse side of the tape mechanism to keep it
electrically connected during repair. See picture 3.
Note: Theflexcablesare very fragile, careshouldbetaken
not to damage them during repair. After repair, be
very sure that the flex cables are inserted properly
intotheflexsocketsbeforeencasing,otherwisefaults
may occurs.
Picture 3
Service position B

3-1 3-1
Various
other Tests
Activated with ACTION TEST
QEEPROM FORMAT
TEST Load default data. Display shows "NEW"
for 1 second.
Caution!
All presets from the customer will be lost!!
Disconnect
mains cord
LEAVE SERVICE
TEST PROGRAM
R
9to Exit
EEPROM TEST A test pattern will be sent to the EEPROM.
"PASS" is displayed if the uProcessor read
back the test pattern correctly, otherwise
"FAIL" will be displayed.
Rotary Volume Knob
or
Jog Shuttle
ROTARY
ENCODER TEST Display shows value for 2 seconds.
Values increases or decreases in steps of 1
until 0 (Min.) or 40 (Max.) is reached.
DSC
DEMO TOGGLE Pressing this button will toggle between
DEMO ON and DEMO OFF. The DEMO
status will scroll once across the Display.
VCD Button
pressed?
Y
N
VCD
TEST
LEVEL
1
2
3
4
5
6
DISPLAY MESSAGE
VCD Vxx
DSA OK
SLD OK
FOC OK
RAD OK
JMP OK
Note: During this test only the standard OSD & Display message are shown on the TV screen.
The Display message takes a few seconds to appear.
-
DSA ER
SLD ER
FOC ER
RAD ER
JMP ER
ACTION
Where xx is the MPEG software version.
Check DSA_Data, DSA_Str & DSA_Ack lines.
CDC Sledge Motor test.
Focus Servo Test, a disc is required in the Tray.
Radial Servo Test.
Disc Servo Test - jumping of 16 tracks.
Press 9to exit
OKAY ERROR
VCD VER
VCD DSA
VCD SLD
VCD FOC
VCD RAD
VCD JMP
INITIAL
DISPLAY
Choose level
by pressing
Q
R
O
Button pressed?
Y
Y
Y
N
N
N
O
Button pressed?
9
Button pressed?
Display shows
12M
Output at (Front Display Board)
pin 19 of uP = 2,929.6875Hz
Display shows
32K
Output at (Front Display Board)
pin 19 of uP = 2048Hz
QUARTZ
TEST
TUNER
Button pressed?
Disconnect
Mains cord ?
Y
N
N
Y
Display Tuner Version
"ccc"
Service frequencies are
copied to the RAM (see Table 1)
Tuner works normally except:
PROGRAM button
Service Mode left
TUNER
TEST
TUNER
Button pressed? N
PRESET
1
2
3
4
5
6
7
8
9
10
11
Oversea
"OSE"
87.5MHz
108MHz
531 / 530kHz*
1602 / 1700kHz*
558 / 560kHz*
1494 / 1500kHz*
87.5 / 98MHz*
87.5MHz
87.5MHz
87.5MHz
98 / 87.5MHz*
Table 1
* Depending on the selected grid frequency (9 or 10kHz)
Note:
a) By holding the TUNER and R buttons depressed while switching
on the Mains supply, the tuning grid frequency is toggled between
9kHz and 10kHz for the Oversea (/21) version.
b) This Tuner information is also applicable for /12 and /28 versions.
Y
N
Y
N
Y
N
2
Button pressed?
2
Button pressed?
9
Button pressed?
DISPLAY
TEST
Display shows Figure 1 and
switch all LEDs on (except VU
Volume & ECO POWER LEDs),
and full VU deflection.
Display shows Figure 2
and switch alternate LEDs on
(see Table 2),
and partial VU deflection.
Figure 1
Figure 2
LEDs
DISC 1
DISC 3
TUNER
TAPE
VAC
VU BACK LIGHT
VU VOLUME
FW-V520 , FW-V720
FW-V780 , FW-V785
FW-V795
On
On
On
On
On
On
On
Table 2
To start service test program
hold ™& Aux
depressed while
plugging in the mains cord
Display shows the
ROM version
"S-Vyy"
(Main menu)
S refers to Service Mode
V refers to Version
yy refers to Software version number of the uProcessor
(counting up from 01 to 99)
SERVICE TEST PROGRAM
Mini2001/Mini2002 VCD_Series Service Test Program (dd wk0141)