Loewe CENTROS 2102 User manual

SERVICEANLEITUNG DVD Recorder
Service Manual. Manuel de Service. Manuale di Servizio.
Instrucciones de servicio. Service-instructies.
230- 90434.936
CENTROS 2102 HD / CENTROS 2172 HD
CENTROS 2102
Art.-Nr. 64502
CENTROS 2172
Art.-Nr. 64512

CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 ....PARTS LIST

1-1
SECTION 1
SUMMARY
CONTENTS
NEW FUNCTIONS OF DVD-RECORDER........................................................................... 1-2
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.............. 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING ................................................. 1-5
SPECIFICATIONS ...................................................................................................................... 1-6

1-2
NEW FUNCTIONS OF DVD-RECORDER
•SUMMARY OF PRODUCT
- RECORDING FUNCTION OF DVD-RW AND DVD-R SPECIFICATIONS
• DVD-RW: VIDEO MODE AND VR MODE RECORD AVAILABLE
• DVD-R :VIDEO MODE RECORD AVAILABLE
- DIGITAL DUBBING FUNCTION OF DV CAMCORDER BY USING DV TERMINAL (IEEE1394)
• RECORD, PLAY, FF/REW FUNCTION BY REMOTE CONTROL OF DV CAMCORDER
- DVD PROGRESSIVE PLAY RESPONSE
- VARIOUS FUNCTION RESPONSE OF DVD RECORDING (DISC NAVIGATION AND CONVENIENT PLAY,
EDIT FUNCTION)
- OUTSIDE INPUT AND TV RECORDING AVAILABLE
• RECORDING SCREEN QUALITY :VR(HQ, SQ, LQ), VIDEO(HQ, SQ)
- TV RESERVE RECORDING FUNCTION (AUTO MODE SETTING AVAILABLE FOR RECORDING IN
ACCORDANCE WITH THE REMAINING DISC SPACE IN RESERVATION)
SUMMARIZED EXPLANATION OF MAIN FUNCTION
•DVD RECORDING FUNCTION(VR MODE RECORD / VIDEO MODE RECORD)
1) VR MODE RECORD : MANUAL MODE RECORDING IN ACCORDANCE WITH VARIOUS EDITING FUNC-
TION, REMAINING DISC SPACE AND PROGRAM TIME DVD-RW DISC RECORDED IN THE VR MODE
CAN BE PLAYED WITH A DVD PLAYER CORRESPONDING TO THE DVD-RW THERE IS ALSO A PLAY-
ER TO BE PLAYED THROUGH FINALIZING. FOR THE DVD-RW, RECORDING AND EDITING IS AVAIL-
ABLE AT THE SAME DEVICE EVEN AFTER FINALIZING.
2) VIDEO MODE RECORDING : THERE IS NO EDITING FUNCTION SUCH AS VR MODE RECORDING
BUT VIDEO MODE RECORDING IS PLAYED IN A GAME DEVICE (FOR EXAMPLE, “PLAY STATION 2”)
WITH PC, DVD PLAY FUNCTION CORRESPONDING TO DVD PLAYER, CAR DVD, DVD-ROM. TO PLAY
IN ANOTHER DEVICE, FINALIZING IS REQUIRED. RECORDING, EDITING AND EDITING IS NOT POS-
SIBLE AFTER FINALIZING. HOWEVER, RECORDING IS ALLOWED AT THE DVD-RW DISC IF ERASING
THE TITLE FINALLY RECORDED AFTER FINALIZING.
3) RECORDING MODE INITIALIZATION (A KIND OF FORMATTING): BEGINS INITIALIZATION AFTER
SELECTING RECORDING MODE AS VR OR VIDEO MODE BY USING INITIALIZATION FUNCTION OF
THE DISC SETTING MENU. INITIALIZES DEFAULT AS VR MODE FOR DVD-RW. RECORDS IT AS
VIDEO MODE WITHOUT INITIALIZATION FOR VIDEO MODE.
4) FINALIZE: BEGINS FINALIZE AT THE DISC SETTING MENU DURING STOP.

1-3
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from LOEWE Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire haz-
ard. These components are indicated by the letter “x”included in their compo-
nent designators and are required to maintain safe performance. No deviations
are allowed without prior approval by LOEWE Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes
into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized modi-
fications will not only void the warranty, but may lead to property damage or
user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
service literature.
The lightning flash with arrowhead symbol within an equilateral tri-
angle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage”that may be of sufficient magni-
tude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi-
lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection fromAC line shock.
After the original service problem has been corrected, make a check of the fol-
lowing:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and
from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled
per the original design. Be sure that the safety purpose of the polarized line
plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign par-
ticles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor rated
at 1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all
exposed metallic parts of the cabinet (the channel selector knobs, antenna
terminals, handle and screws) to be sure that set is safe to operate without
danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS-
FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per
volt or more sensitivity in the following manner: Connect a 1500 ohm, 10
watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a
known good earth ground water pipe, conduit, etc.) and the exposed metal-
lic parts, one at a time. Measure the AC voltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where
dew is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. A product mounted to a
shelf or platform must retain its original feet (or the equivalent thickness in
spacers) to provide adequate air flow across the bottom. Bolts or screws
used for fasteners must not touch any parts or wiring. Perform leakage tests
on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilt-
ed position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small cast-
ers across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous conse-
quences to home and family.
A.C. Voltmeter
1500 OHM
10 WATT
Place this probe
on each exposed
metal part.
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.15uF
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-4
SERVICING PRECAUTIONS
CAUTION : Before servicing the DVD Recorder covered by
this service data and its supplements and addends, read and
follow the SAFETY PRECAUTIONS. NOTE : if unforeseen
circumstances create conflict between the following servic-
ing precautions and any of the safety precautions in this pub-
lications, always follow the safety precautions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the DVD RecorderAC power cord from the
AC power source before:
(1)Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2)Disconnection or reconnecting any internal electrical
plug or other electrical connection.
(3)Connecting a test substitute in parallel with an elec-
trolytic capacitor.
Caution : A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
2. Do not spray chemicals on or near this DVD Recorder or
any of its assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5. Do not apply AC power to this DVD Recorder and/or any
of its electrical assemblies unless all solid-state device
heat sinks are cerrectly installed.
6. Always connect test instrument ground lead to the
appropriate ground before connection the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter(500V)
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, Input terminals, Earphone jacks, etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially available discharging wrist strap device, which
should be removed for potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grouned-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static solder removal device. Some
solder removal devices not classified a “anti-static”can
generate electrical charges sufficient to damage ES
devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
leads electrically shorted together by conductive foam,
aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution : Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

1-5
SERVICE INFORMATION FOR EEPROM IC SETTING
MICOM START
Yes
Yes
Yes
No
Yes
No
EEPROM ID CHECK
2 BYTE(B3,248,249)
ID OK?
B3, 230, 231(A20,03)
OPTION DATA READ
5TIME & COMPARE
MICOM NORMAL
OPERATION START
*** EEPROM INITIAL ***
- SETUP is displayed in the field if pressing the Front “SCAN-”Key with the Remocon "END"
key pressed in the status of powering on.
- AUTO SEARCH is done since the initial screen of ACMS is serviced if powering on.
OPTION
CONFIRMATION MODE
Press the "END" key on
the Remote controller and
the "SCAN - " key one the
Front Panel the same
time, then it goes in to
Tracking initial mode.
OPTION condition of Present time
the CHECK There is a Possibility of
doing and the OPTION the REWRITE
it is possible.
CENTROS 2102 HD NAME HEX BINARY
OPT1 D8 11111000
OPT2 61 01100001
OPT3 31 00110000
OPT4 43 11000011
OPT5 0A 00001010
OPT6 AE 10001110
OPT7 E4 11100100
OPT8 E5 11100100
CENTROS 2172 HD NAME HEX BINARY
OPT1 D8 11111000
OPT2 61 01100001
OPT3 60 00110000
OPT4 41 11000011
OPT5 4A 00001010
OPT6 AE 10001110
OPT7 E6 11100100
OPT8 F2 11100100
WRITE:OK EXIT : MP
MOVE:< > EDIT :
MASK : 40 , EEP : FF, <OR>, D47
( Each mask ,eeprom, It shows a development
release version.)

1-6
SPECIFICATIONS
•GENERAL
Power requirements AC 200-240V, 50/60 Hz
Power consumption 44W
Dimensions (approx.) 430 X 92 X 382.5 mm (16.9 x 3.6 x 15 inches) (w x h x d) Mass
(approx.) 6.4 kg (14.1 lbs)
Operating temperature 5˚C to 35˚C (41˚F to 95˚F)
Operating humidity 5 % to 90 %
Television system PAL B/G colour system
Recording format PAL
•RECORDING
Recording format DVD VideoRecording, DVD-VIDEO
Recordable discs DVD-ReRecordable, DVD-Recordable
Recordable time Approx. 1 hour (HQ mode), 2 hours (SQ mode),
4 hours (LQ mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG 2
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
•DVD SPECIFICATIONS
Laser system Semiconductor laser
Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
Signal-to-noise ratio More than 100 dB
Harmonic distortion Less than 0.008%
Dynamic range More than 95 dB
•INPUTS
AERIAL IN Aerial input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCART
AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R) x 2 / SCART
DV IN 4 pin (i.LINK/IEEE 1394 standard)
•OUTPUTS
VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1
S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
Audio output (optical audio) 5 V (p-p), 75 Ω, Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART
•ACCESSORY:
Video cable..................................1 Audio cable . . . . . . . . . . . . . .1
RF Coaxial Cable.........................1 Blank DVD-R disc . . . . . . . . . .2
Remote control ............................1 Batteries . . . . . . . . . . . . . . . . .2

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS ....................................................................................................................2-2
1. Cabinet and Main Frame Section ..........................................................................................2-2
2. Deck Mechanism Section(MTK) ............................................................................................2-3

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
280
283
260
320
265
263
264 471
463
463
463
463 463
463
463
463
463
250
261
261
261 262
452
A50
A48
A44
A60
A46
A54
300
A47
A43
;;;
NOTES) Warning
NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.
A
5
4
3
2
1
BCD

2-3
2. DECK MECHANISM SECTION(MTK)
1001
A001
1025
1025
1030
1432
1029
1432
1021
1432
1432
1032
1033
1011 1019
1009
1020
1019
1012
1013
1439
1014
1016
1015
1017
1018 1018A
1018B
1018E
1435
1018E
1018D
1006
1436
1024 1433
1029
1027
1027
1026
1003 1002
A004
A002
A000
A60
1437
1005
1434
1434
MAIN PCB

3-1
SECTION 3
ELECTRICAL
CONTENTS
VDR PART
ELECTRICAL TROUBLESHOOTING GUIDE..................................................................................................3-2
BLOCK DIAGRAMS .......................................................................................................................................3-18
1. POWER(SMPS) BLOCK DIAGRAM........................................................................................................3-18
2. VIDEO BLOCK DIAGRAM_PAL..............................................................................................................3-20
3. AUDIO BLOCK DIAGRAM PAL...............................................................................................................3-22
CIRCUIT DIAGRAMS......................................................................................................................................3-24
1. POWER CIRCUIT DIAGRAM..................................................................................................................3-24
2. I/O MICOM CIRCUIT DIAGRAM .............................................................................................................3-26
3. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM...............................................................................3-28
4. HDMI CIRCUIT DIAGRAM ......................................................................................................................3-30
5. MPEG CIRCUIT DIAGRAM.....................................................................................................................3-32
6. TIMER/KEY CIRCUIT DIAGRAM ............................................................................................................3-34
7. FRONT AV JACK CIRCUIT DIAGRAM....................................................................................................3-36
8. FRONT AV JACK_DV+SUPER CIRCUIT DIAGRAM..............................................................................3-38
•CIRCUIT VOLTAGE CHART .....................................................................................................................3-40
PRINTED CIRCUIT DIAGRAMS.....................................................................................................................3-44
1. MAIN P.C.BOARD(TOP SIDE) ...............................................................................................................3-44
2. MAIN P.C.BOARD(BOTTOM SIDE).........................................................................................................3-46
3. JACK P.C.BOARD....................................................................................................................................3-48
4. FRONT P.C.BOARD ................................................................................................................................3-48
5. KEY TIMER P.C.BOARD .........................................................................................................................3-50
6. POWER P.C.BOARD...............................................................................................................................3-50
MTK LOADER PART
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................3-52
BLOCK DIAGRAMS & DESCRIPTION..........................................................................................................3-66
1. SERVO SYSTEM BLOCK DIAGRAM......................................................................................................3-66
2. MT1816 BLOCK DIAGRAM.....................................................................................................................3-67
3. MT1818 BLOCK DIAGRAM.....................................................................................................................3-68
CIRCUIT DIAGRAMS......................................................................................................................................3-69
1. RF CIRCUIT DIAGRAM ..........................................................................................................................3-69
2. DSP CIRCUIT DIAGRAM ........................................................................................................................3-71
PRINTED CIRCUIT DIAGRAMS.....................................................................................................................3-73
1. MAIN P.C.BOARD(TOP SIDE).................................................................................................................3-73

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
VDR PART
No 5.3VA
Replace the F101
(Use the same Fuse)
Is the F101
Normal?
Is the R101 Normal?
Is Vcc (9V - 18V) sup-
plied to IC101 Pin7?
IS the D123
normal?
Is there about 2.5V
at the IC103 Pin1?
Is the BD101
Normal?
NO
NO
NO
NO
NO
Replace the BD101
Replace the R101
Is the D102
normal?
Check or Replace
the D102
Replace the D123
NO Replace the IC103
YES
YES
YES
YES
Replace the D126
Is the D126
Normal?
Power Line of Main
PCB is short
Is the D127
Normal?
NO
NO Replace the D127
YES
YES
YES
NOYES
YES
Is the IC102
normal? NO Replace the IC102
YES
Is the D124
Normal? NO Replace the D124
YES
Is the D125
Normal? NO Replace the D125
YES
YES

3-3
No 5VD
Check or Replace
the D123
Is the Vcc(3.3V) sup-
plied to Q162 Emittor?
Check or Replace
the Q162
Is the Q162 Base
‘H’?
NO
NO
Check the TIMER “H”
signal from µ-com
YES
YES
YES
No 5VT
Check or Replace
the D123
Check the PWR CTL
“H”signal from µ-com
Is the Vcc(3.3V) sup-
plied to Q164 Emittor?
Is the Q164 Base ‘H’?
Check or Replace
the Q164
NO
NO
YES
YES
YES
No 5.0VL
Check or Replace
the D123
Is the Vcc(5.3V) sup-
plied to IC156 pin 1?
Check or Replace
the IC156
Is the IC156 pin4
‘H’?
NO
NO
Check the TIMER “H”
signal from µ-com
YES
YES
YES
No 5.0V_M
Check or Replace
the D123
Check the PWR CTL
“H”signal from µ-com
Is the Vcc(5.3V) sup-
plied to IC156 pin 1?
Is the IC156 pin4
‘H’?
Check or Replace
the IC156
NO
NO
YES
YES
YES

3-4
No 12VL
Check or Replace
the D127
Is the Vcc(13.5V) sup-
plied to IC152 pin 1?
Check or Replace
the Q152
Is the IC152 pin4
‘H’?
NO
NO
Check the PWR CTL
“H”signal from µ-com
YES
YES
YES
No 12VT(12VG)
Check or Replace
the D127
Check the GREEN
“H”signal from µ-com
Is the Vcc(13.5V) sup-
plied to IC151 pin 1?
Is the IC151 pin4
‘H’? (Only 12VT)
Check or Replace
the IC151
NO
NO
YES
YES
YES
No 12V
Check or Replace
the D127
Is the Vcc(13.5V) sup-
plied to IC157 pin 1?
Check or Replace
the IC157
Is the IC157 pin4
‘H’?
NO
NO
Check the PWR CTL
“H”signal from µ-com
YES
YES
YES
No 3.3VL / 3.3V
Check or Replace
the D124, D125
Check the PWR CTL
“H”signal from µ-com
Is the Vcc(3.8V) sup-
plied to IC153 pin 1?
Is the IC153 pin4
‘H’?
Check or Replace
the IC153
NO
NO
YES
YES
YES

3-5
No 3.3V(HDMI)
Check or Replace
the D124, D125
Is the Vcc(3.8V) sup-
plied to IC155 pin 1?
Check or Replace
the IC155
Is the IC155 pin4
‘H’?
NO
NO
Check the PWR CTL
“H”signal from µ-com
YES
YES
YES
No 2.5V
Check or Replace
the D124, D125
Check the PWR CTL
“H”signal from µ-com
Is the Vcc(3.8V) sup-
plied to IC154 pin 1?
Is the IC154 pin4
‘H’?
Check or Replace
the IC154
NO
NO
YES
YES
YES
No 33V
Replace the D126
Is the Vcc(33V) sup-
plied to Q161Emittor?
Is the Q161 Base
‘H’?
Is the ZD126
Normal?
NO
NO Replace the ZD126
NO
Check the TIMER “H”
signal from µ-com
YES
YES
YES
Check or Replace
the Q161
YES
No VF+
Replace the ZD121
Is the ZD121
Normal?
Replace the R121
NO
YES
YES

3-6
IC504 12 JIGH?
(RESET) Check IC504 power and other
circuits
X501 : Clock oscillated ?
( 27 MHz ) Replace X501
IC502-24 :
Check signal(D_CS#)
Check IC501 signal flow
Check DRIVE power?
5V, 12V Check SMPS
Check ATAPI Interface connector
C514
LOEWE logo not displayed at
POWER ON
YES
NO
YES
NO
YES
NO
YES
NO
SYSTEM Section
DISC not recognized
Check IC504 power and other
circuits

3-7
When playing DISC, no audio output
IC805 –15, 18
Check audio output Check IC805 power and
other circuits
IC805 - 10 : HIGH ?
(DAC RESET status) Check IC501 204 pin
IC802 - 7, 8 :
I2C signal normal? Check R910, R894
Check IC805 power and
other circuits
IC701 - 58: HIGH ?
( LOW: AUDIO MUTE ) Check IC701 power and
other circuits
No OPTICAL / DIGITAL output
IC501 216 pin
signal normal? Check SMPS
Check R933, R806
Check IC501 power and
other circuits
YES
NO
YES
NO
YES
YES
NO
NO NO
NO

3-8
No TUNER audio output
IC809, 810
Check audio signal output
Check IC810,809 (AUDIO SWITCH) power and
Switching operation
Pin 2,4 High/Low =>Pin 7 output :
SW_A_OUT_L/R
IC808, 809, 810
Check audio signal input
Audio output even when
playing DISC < When playing DISC, no audio output. > Check
IC808 - 23,27
Check audio signal output
Check IC810,809 signal flow
and power
IC804 - 32,33
Check I2C signal flow
Q803 2(Emitter ) High ?
IC804 – 9:LOW?
HIGH: AUDIO MUTE
IC804 - 32,33
Check signal flow
IC702 - 46
LOW:AUDIO MUTE
IC808 –20,24
Check audio signal input
Check R861, R868, C845, C888
signal flow
IC 812 - 30,31 :
No audio signal output
Check IC812 power and other
circuits Check X801 oscillated
YES
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
NO
YES
NO
NO

3-9
No TUNER VIDEO signal input
When
changing a channel, IC701 -
8 :HIGH after RESET signal?
Check TUNER power and
other circuits
Check IC701 power and
other circuits
IC812 - 2 : Check SIF
signal input\ Check C920, TUNER signal flow
Check C724 with IC703 circuit
YES
NO
YES
YES
NO