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
DF-4501PN VE2.5 COMBO SVC 2007.10.9 12:59 PM ˘ ` 1 mac001 1200DPI 80LPI

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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
DF-4501PN VE2.5 COMBO SVC 2007.10.9 1:0 PM ˘ ` 4 mac001 1200DPI 80LPI

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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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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
DF-4501PN VE2.5 COMBO SVC 2007.10.9 1:0 PM ˘ ` 9 mac001 1200DPI 80LPI