DAEWOO ELECTRONICS DF-4501PN User manual

Service Manual
DVDR+VCR Combi
MODEL : DF-4501PN , DF-4700PN
DRV-6705(S) , DRV-6702S
DRV-6402S , DRV-6502S
DRV-6815
Sep. 2007
DF-4501PN VE2.5 COMBO SVC 2007.10.9 12:59 PM ˘ ` i mac001 1200DPI 80LPI
SM NO : DF4501P001

1
SPECIFICATIONS...............................................................................................................2
TROUBLE SHOOTING....................................................................................................................3
WAVEFORMS ................................................................................................................................24
BLOCK DIAGRAM ........................................................................................................................27
CIRCUIT DIAGRAM.......................................................................................................................28
PCB CIRCUIT BOARD..................................................................................................................46
INSTRUMENT DISASSEMBLY .....................................................................................................50
ELECTRICAL PARTSLIST............................................................................................................51
CONTENTS
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2
SPECIFICATIONS
General
Powerrequirements 200—240V~,50/60Hz
Powerconsumption Operation :Maximum26W
Standby: 5W
Dimensions(approx.) 430*92 *312 (w*h*d)
Mass(approx.) 4.96 Kg
Operatingtemperature 5¡Cto 35¡C
Operatinghumidity 5% to 90%
Signalsystem PAL Colour
Recording
Recordingformats DVDVideoRecording, DVD-
VIDEO
Recordablediscs DVD–R, DVD–RW
Recordabletime [DVD] (Approx.) 1hour(HQ
mode),2 hours (SPmode),4
hours(EP mode), 8hours
(SEPmode)
[VCR]SP: 3 Hours(E-180),
LP: 6 Hours(E-180)
Video recording format
Samplingfrequency 27MHz
Compressionformat MPEG2
Audio recording format
Samplingfrequency 48kHz
Compressionformat MPEG1Layer2
VCR Specifications
Headsystem 4Head Video,2 Head Hi-Fi
helicalscan azimuth system
Timer 24-hourdisplaytype
Tape speed SP:23.39mm/sec
LP:11.70mm/sec
Tape width 12.7mm
Rewindtime less than 150sec(E-180)
Channelcoverage VHF:2-12,13-20,74-80 /
UHF:21- 69/ CATV:1-41
Frequencyrange 20Hz to 20kHz
Signal-to-noiseratio 43 dB
Dynamicrange 75 dB
Channelseparation 45dB
DVD Specifications
Lasersystem Semiconductorlaser,
wavelength650 nm
Frequencyresponse DVD (PCM 48kHz):8 Hz to22
kHz,CD: 8 Hzto20 kHz
VideoS/N Morethan60 dB
AudioS/N More than 90dB
Harmonicdistortion Less than 0.06%
Dynamicrange More than 90dB
Resolution Over500lines (HQRecording)
Inputs
AntennaIn Antennaor CATVinput,75‰
VideoIn 1.0Vp-p75 ‰,sync negative,
RCAjack x 2
AudioIn -8.8 dBm morethan47 k, RCA
jack(L, R) x2
DVIN 4pin (i.LINK/IEEE 1394
standard)
USBIn/Out Series A Connector(USB 2.0
FullSpeed)
Outputs
VideoOut Composite output(1.0Vp-p,
unbalanced)RGB output (75in
load,R:0.7Vp-p, G:0.7Vp-p,
B:0.7Vp-p)
S-VideoOut(Y) 1.0V(p-p), 75 ‰,negative
sync,Mini DIN 4-pinx1,(C)
0.286V (p-p) 75 ‰
ComponentVideoOut (ProgressiveScan)
(Y)1.0 V (p-p), 75‰,negative
sync,RCA jack x1
(Pb)/(Pr)0.7 V (p-p), 75‰,
RCAjack x 2
AudioOut Digital audio :0.5V(p-p), 75
‰,RCA jack x 1
Analogaudio : 1.1Vrms(1kHz,
-6dB), 600 ‰,RCA jack(L,R)
x2
HDMIvideo/audio output
19pin (HDMI standard,Type
A)
Accessories
RFcable ............................................................1
Remotecontrol .................................................1
Batteries ............................................................2
Design and specifications are subject to change without
notice.
ManufacturedunderlicensefromDolby
Laboratories. Dolby andthe double-D symbol are
trademarksofDolbyLaboratories.
DTSandDTSDigitalOutareregistered
trademarksofDigitalTheaterSystems,Inc.
DF-4501PN VE2.5 COMBO SVC 2007.10.9 12:59 PM ˘ ` 2 mac001 1200DPI 80LPI

TROUBLESHOOTING
3
1. No output voltage of POWER CIRCUIT
get input, DC 200~240 Valtage
1. POWER CIRCUIT
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4
TROUBLESHOOTING
2. SYSTEM CIRCUIT
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5
TROUBLESHOOTING
P303
Check REMOCON_IN
(Pin13)
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TROUBLESHOOTING
PC01
ICC01 #2 Check ICC01,CC12 & CC13
MT8108
RM43 & RN20
B. Digital Board(Mpeg)
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TROUBLESHOOTING
Noise appears on the
playback screen.
Is noise diminished by tracking
adjustment.
Noise band is trembled up and
down?
Re-adjust PATH.
IstheheightofCTLHEAD normal?
Nodust?
Is there problem in CTL Input circuit
and amplifier.
YES
NO
NO
NO
Is there CTL pulse at IC501
pin#97?
Check IC501.
Noise appears on the screen even
though changing tape.
Re-adjust the height of AC HEAD.
Remove the dust.
Check C510,R545~R547
IC 501 pin #94, 95, 97.
NO
Re-adjust PATH.
C-1. Bad playback quality (1)
YES
YES
YES
YES
Noise appears on the Full
playback screen.
Are SW pulse and HA SW normal?
Recheck step B-1
(Bad playback quallty (1)).
CheckHEADAMPconnector
andHEAD.
YES
YES
NO
NO
ENVE Wave at P502 pin #4?
CheckVIDEOcircuit.
Are there SW, HA SW pulse at
IC501 pin #16, 18?
Check PCB Pattern.
CheckIC501.
C-2. Bad playback quality (2)
YES
NO
YES
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8
TROUBLESHOOTING
No broadcasting signal
received
Is the output at
P303(VCR)/PC03(DVD)
pin#1(CLK), 2(DATA) normal?
Is SIF,Video output at TMI(RF101)
pin#16,19 normal?
Check ICN01.
Check IC301
Check P302
YES
YES
NO
NO
NO
Is Video Signal input atIC301
pin#56?
Is there Video output at P302
pin#5?
Check TMI (RF101) Block.
NO
Check Video Buffer Q671
D. No broadcasting signal received
YES
YES
YES
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TROUBLESHOOTING
Cassette tape isn’t inserted.
Is 5V voltage obtained at Loading
parts IC501 pin#63?
Is 14V voltage obtained at
Capstan Motor P501 pin#2?
Check at EVER 14V
Check D825
ConnectCapstanandLoadingMotor.
CheckconnectorandCapstanMotor.
YES
NO
NO
NO
Is 13VvoltageobtainedatEach
partsofLoadingMotor?
Replace Loading Motor.
Check D825 and POWER circuit.
E. No CASSETTE Loading
YES
YES
F. AUTO STOP in Playback mode
VCR stops automatically in
playback mode.
Check R544,C516 and P501
pin#11.
CheckS501,S502REELSensor.
Is D.PG/FG pulse at IC501
pin#90 normal ?
Is C. FG pulse at IC501 pin#87
normal ?
IsthereREELPulseatIC501
pin#79,80?
CheckandreplaceIC501.
NO
YES
YES
YES
NO
Check C.FG(R543,C517) and
P501 pin#1.
NO
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TROUBLESHOOTING
G. DRUM Motor stops
H. CAPSTAN doesn’t rotate
CAPSTAN doesn’t rotate.
Is EVER 14V voltage obtained
at P501 pin#2?
YES
NO
NO
NO
YES
YES
Is Capstan PWM fit to
IC501 pin#77?
Is 3.2V voltage obtained
at P501 pin#5?
Is 2.7V voltage obtained
at P501 pin#9?
Check P501 Connector and
Capstan Motor.
Check EVER 14V
(D825).
Check Capstan FG
(IC 501 pin# 87).
Check
R541,R540,R539,R538,C518
Check R537,R536,C521
DRUM Motor stops.
Is 14V voltage obtained at P501
pin#8?
YES
NO
NO
NO
YES
YES
Is DRUM PWM fit to IC 501
pin#76?
Is 2.6V voltage obtained at
P501 pin#12?
Check Capstan Motor and
DRUM Motor.
Check EVER 14V
(D825).
CheckDRUMPG/FG
(IC501pin#90).
CheckR534,R535,C519,C520.
NO
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TROUBLESHOOTING
3. VIDEO circuit
A. EE screen doesn’t appear
EE MODE Picture NG
Is Video signal input at
IC301 pin#48,50,52,54?
Is 5V supplied at
pin#42,55,72,91of IC301?
Is C.S, DATA, CLOCK signal
input pin#67,68,69 of IC301?
Check IF and SCART JACK.
Check POWER circuit.
Check IC501
pin #58,71,72
NO
YES
YES
NO
NO
YES
Is signal output from pin#65 of
IC301?
YES
NO Check IC301
pin#62 Q-V Sync.
Is signal input into pin#21
of P302?
YES
NO Check PCB Pattern.
Is signal output from pin#5
of P302?
YES
NO Check MPEG circuit.
Is signal output at IC301
pin#61?
YES
NO Check PCB Pattern.
Is signal input at IC301
pin#56?
Check RF Output. Check PCB Pattern & LINE
out.
YES
YES
Check IC301.
NO
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12
TROUBLESHOOTING
B. Playback picture doesn’t appear
1) No VCR Playback Picture
YES
YES
Is Y SIGNAL output at IC301
pin#46?
Is VIDEO SIGNAL output at IC301
pin#65?
Check and Replace IC301.
PB video signal missing.
Is Envelope output from IC301
pin#79?
NO
NO
Same as EE MODE check.
Is 5V supplied at IC301 pin#91?
Is SW Pulse input at IC301
pin#70?
Is 5V obtained at IC301 pin#24,
42,55,72,91?
Check POWER 5V.
Check IC501 pin#18.
Clean head or Replace head.
Check POWER 5V.
NO
NO
Check PATTERN
NO
YES
YES
YES
YES
YES
YES
NO Does X301(4.43MHz)
oscillate?
Is Y SIGNAL input at IC301
pin#43? NO Check PATTERN
YES
NO Replace X301.
NO Check and replace IC301.
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TROUBLESHOOTING
2)No DVD Playback Picture
Check RC17,(Digital board)
Check R385, R386,R387,R400,R404(Analog board)
CN63 and CN64
2) No DVD Playback Picture
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TROUBLESHOOTING
Is +5V supplied at IC301 pin#91? NO
NO
YES
YES
Is VIDEO SW Pulse input at IC301
pin#70?
Is REC signal output from IC301
pin#94,95,89,90?
SP MODE: 89,90 Pin
LP MODE: 94,95Pin
Check video HEAD and Connector.
Is signal input into IC301
pin# 48,50,52,54,56?
Check POWER circuit.
Check IC501 pin#18.
Record video signal poor.
Check EE MODE.
YES
Is luminance and color signal
output from IC301 pin#78?
Replace IC301.
NO
NO
YES
C. No Recording
1) VCR Part
YES
Is IC301 pin#80 REC(H) HIGH? Check IC501 pin#1.
NO
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TROUBLESHOOTING
DVD is not recording
Check RC17.(Digital board)
Check R385, R386, R387, R400,
R404(Analog board)
at
254 CC20 and PC02 #21.
CN63 and CN64
APD[15:0] of ICN01? Replace ICN01.
n 69,70,71,72
CD05 and CD06.
2) DVD Part
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TROUBLESHOOTING
4. AUDIO
No sound in RF E-E mode
Is Audio signal output at IC602 pin
#3, 13?
A. No sound in E-E mode
a. RF E-E
Is Audio signal output at IC251
pin#3,5? Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is Audio signal output at ICD02
#1,7?
Replace IC251.
YES
YES
Is Audio signal output at ICA02
#7,10?
NO
NO
YES
Check ICA02
YES
Is there SIF signal at PC02 #23 in
RF mode? Check RF101.
NO
Is there Digital signal out at RA06? Check ICN01.
NO
YES
YES
Check Digital board(No sound in
E-E mode)
NO
Check Output JACK.
YES
Check ICD02
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TROUBLESHOOTING
b. AV1 E-E
No sound in AV1 E-E mode.
NO Check Input AV1 JACK
Is Audio signal at IC251 pin#6, 7?
Is Audio signal output at IC602 pin
#3, 13?
Is Audio signal output at IC251
pin#16,17? Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is 5V obtained at IC251 pin#40?
Replace IC251.
YES
YES
Is 12V obtained at IC251 pin#34?
NO
YES Check POWER circuit.
YES
YES
Check Output JACK.
YES
Check Digital board(No sound in
E-E mode)
NO
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TROUBLESHOOTING
c. AV2 E-E
No sound in AV2 E-E mode.
NO Check Input AV2 JACK
Is Audio signal at IC251 pin#8, 9?
Is Audio signal output at IC602
pin #3, 13?
Is Audio signal output at IC251
pin#19, 20? Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is 5V obtained at IC251 pin#40?
Replace IC251.
YES
YES
Is 12V obtained at IC251 pin#34?
NO
YES Check POWER circuit.
YES
YES
Check Output JACK.
YES
Check Digital board(No sound in
E-E mode)
NO
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TROUBLESHOOTING
d. FRONT E-E
No sound in FRONT E-E
mode.
NO Check Input FRONT JACK
Is Audio signal at IC251
pin#10,11?
Is Audio signal output at IC602 pin
#3, 13?
Is Audio signal output at IC251
pin#19, 20? Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is 5V obtained at IC251 pin#40?
Replace IC251.
YES
YES
Is 12V obtained at IC251 pin#34?
NO
YES Check POWER circuit.
YES
YES
Check Output JACK.
YES
Check Digital board(No sound in
E-E mode)
NO
DF-4501PN VE2.5 COMBO SVC 2007.10.9 1:0 PM ˘ ` 19 mac001 1200DPI 80LPI