Daewoo DV-F24S User manual
DAEWOO ELECTRONICS CO., LTD.
Service Manual
MODEL: DV-F24S/F44S
DV-F26S/F46S
DV-F28S/F48S
PAL/MESECAM/SECAM
MARCHE EJECT
ENR./IMM.
CAN/ALIGN
R.R. AV.R.
LECTURE
STOP
•
MARCHE
EJECT ENR./IMM. R.R. AV.R.
LECTURE
STOP
CAN/ALIGN
•
+ CHAINE – ENR.
R.R. AV.R.
STOP LECTUREEJECTMARCHE
✔
Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
SPECIFICATIONS
GENERAL
Power requirement : AC 230V, 50Hz
Power consumption : Typical 18W (in REC mode)
Temperature : 5°C~35°C (Operating)
–20°C~60°C
(Storage temperature)
Operating position : Horizontal only
Dimensions (WxHxD) : 360X90X332 (mm)
Weight : Approx. 5.0Kg
Format : VHS standard
Tape width : 12.65mm
Tape speed : (SP): 23.39 mm/sec
(LP): 11.70 mm/sec (4HEAD)
Maximum recording time
with full-size cassette : (SP): 240 min. with E-240
video cassette
(LP): 480 min. with E-240
video cassette (4HEAD)
Maximum recording time
with full-size cassette : (SP): 45 min. with EC-45
cassette
(LP): 90 min. with EC-45
cassette (4HEAD)
VIDEO
Signal system : PAL/SECAM colour and CCIR
monochrome signals,
625 lines/50 fields
Recording system : Rotary two-head helical scan
with a slant double-azimuth
combination video head
(4HEAD)
Input : 1.0 Vp-p, 75 ohms, unbalanced
Output : 1.0 Vp-p, 75 ohms, unbalanced
Signal-to noise ratio : 45 dB (Rohde & Schwarz noise
meter) with NETTETE IMAGE
control at center position
Horizontal resolution : 240 lines with NETTETE IMAGE
control at center position
AUDIO
Recording system : Longitudinal track
Input : –8 dBs, (CENELEC standard),
more than 47 k-ohms,
unbalanced
Output : –6 dBs, (CENELEC standard),
less than 1 k-ohm, unbalanced
(100 k-ohms, load)
Frequency range : 100 Hz to 8,000 Hz
Signal to noise ratio : 40 dB (More than)
TUNER
Tuning system : Voltage synthesized tuner
Programmable V/S 59 CH
(99 CH option) (Hyper band)
RF Output : UHF channel 36
(Adjustable 30~39)
TIMER
Memory programmable
59 CH (99 CH option)
Back up time : More than 30 minutes
Clock exactness : In accordance with the exactness
of power supply frequency (50Hz)
ACCESSORIES
Provided Accessories : Remote control unit
RF Cable, Batteries
* Design and specifications can be subjected to change
without notice.
1
• Safety Check after Servicing
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires
have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order
to verify compliance with safety standards.
1. Insulation resistance test
Confirm the specified insulation resistance between power cord plug prongs and externally exposed parts of the set
(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is
greater than values given in table 1 below.
2. Dielectric strength test
Confirm specified dielectric strength between power cord plug prongs and exposed accessible parts of the set (RF
terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is
greater than values given in table 1 below.
3. Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between soldered
terminals, and between terminals and surrounding
metalic parts. See table below.
Table 1: Rating for selected areas
* Class II model only.
Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and
locality.
4. Leakage current test
Confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally exposed
accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks,
earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accesible parts. Use and AC
voltmeter to measure across both terminals of load Z.
See figure 2 and the following table.
Table 2: Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and
locality.
Fig. 2
AC Line Voltage Region Insulation Dielectric Clearance
Resistance Strength Distance (d), (d')
100V Japan ≥1 MΩ/500 V DC 1kV AC 1 minute ≥3 mm
110 to 130V USA & – – – 900V AC 1 minute ≥3.2mm
Canada
* 110 to 130 V Europe ≥4 MΩ/500 V DC 3 kV AC 1 minute ≥3 mm (d)
200 to 240 V Australia ≥6 mm (d')
(a: Power cord)
AC Line Voltage Region Earth Ground
Load Z Leakage Current ( i)(B) to:
100V Japan i≤1 m A rms Exposed accessible
parts
110 to 130 V USA & i≤0.5 m A rms Exposed accessible
Canada parts
i≤0.7 m A peak Antenna earth
110 to 130 V Europe i≤2 m A dc terminals
200 to 240 V Australia i≤0.7 m A peak Other terminals
i≤2 m A dc
Fig. 1
1k
1.5k
1.5kµF
2k
50k
d
Primary circuit termimals
Chassis
d'
a
Z
Exposed
accessible
part AC Voltmeter
(high impedance)
Earth Ground
power cord plug prongsB
TABLE OF CONTENTS
SECTION 1. CONTROLS AND FUNCTIONS...........................................................................................................3
SECTION 2. ELECTRICAL ADJUSTMENTS
2-1. VIDEO CIRCUIT ADJUSTMENT METHODS.....................................................................................................................5
2-2. AUDIO CIRCUIT ADJUSTMENT METHOD.......................................................................................................................7
2-3. IF MODULE CIRCUIT ADJUSTMENT METHODS............................................................................................................8
SECTION 3. CIRCUIT OPERATION PRINCIPLES
3-1. POWER CIRCUIT..............................................................................................................................................................12
3-2. VIDEO CIRCUIT................................................................................................................................................................14
3-3. IF CIRCUIT OPERATION..................................................................................................................................................19
SECTION 4. TROUBLE SHOOTING FLOW CHART
4-1. POWER CIRCUIT..............................................................................................................................................................21
4-2. PIF CIRCUIT TROUBLE SHOOTING...............................................................................................................................23
4-3. LOGIC CIRCUIT................................................................................................................................................................24
4-4. SERVO-SYSCON CIRCUIT..............................................................................................................................................26
4-5. AUDIO CIRCUIT................................................................................................................................................................34
4-6. VIDEO CIRCUIT................................................................................................................................................................36
SECTION 5. WAVEFORMS OF THE VIDEO CIRCUIT......................................................................................47
SECTION 6. µ-COM PORT DESCRIPTION............................................................................................................51
SECTION 7. CIRCUIT DIAGRAM
7-1. CONNECTION DIAGRAM................................................................................................................................................57
7-2. POWER CIRCUIT..............................................................................................................................................................58
7-3. MAIN CIRCUIT..................................................................................................................................................................59
7-4. LOGIC CIRCUIT................................................................................................................................................................60
7-5. VIDEO CIRCUIT................................................................................................................................................................61
7-6. 2 HEAD PRE AMP CIRCUIT.............................................................................................................................................62
7-7. 4 HEAD PRE AMP CIRCUIT.............................................................................................................................................63
7-8. SECAM COLOUR CIRCUIT.............................................................................................................................................64
7-9. AUDIO CIRCUIT................................................................................................................................................................65
7-10. IF MODULE CIRCUIT.....................................................................................................................................................66
7-11. PIF CIRCUIT....................................................................................................................................................................67
7-12. SW & SCART CIRCUIT...................................................................................................................................................68
7-13. OSD CIRCUIT.................................................................................................................................................................69
7-14. REMOTE CONTROL CIRCUIT (VR-F2B).......................................................................................................................70
SECTION 8. COMPONENTS LOCATION GUIDE ON PCB (BOTTOM VIEW)
8-1. PCB MAIN.........................................................................................................................................................................71
8-2. PCB POWER.....................................................................................................................................................................72
8-3. PCB PRE AMP (4HEAD)...................................................................................................................................................72
8-4. PCB PRE AMP (2HEAD)...................................................................................................................................................72
8-5. PCB VIDEO.......................................................................................................................................................................73
8-6. PCB IF MODULE..............................................................................................................................................................73
8-7. PCB AV & SCART.............................................................................................................................................................73
8-8. PCB LOGIC.......................................................................................................................................................................74
SECTION 9. DISASSEMBLY
9-1. PACKING ASS'Y...............................................................................................................................................................76
9-2. FRONT PANEL ASSEMBLY.............................................................................................................................................77
9-3. SET TOTAL ASSEMBLY ..................................................................................................................................................80
9-4. INSTRUMENT DISASSEMBLY........................................................................................................................................81
9-5. JIG PCB CONNECTION DIAGRAM.................................................................................................................................89
SECTION 10. ELECTRICAL PART LIST...................................................................................................................90
2
3
SECTION 1. CONTROLS AND FUNCTIONS
MARCHE EJECT
ENR./IMM.
CAN/ALIGN
R.R. AV.R.
LECTURE
STOP
•
!@ #$% &
*^(
FRONT
1. F24S/F44S SERIES
MARCHE
EJECT ENR./IMM. R.R. AV.R.
LECTURE
STOP
CAN/ALIGN
•
!@ #$%*(
&^
2. F26S/F46S SERIES
+ CHAINE – ENR.
R.R. AV.R.
STOP LECTUREEJECTMARCHE
!@ &^
(*%#$
3. F28S/F48S SERIES
4
AUX/POU
R
TV
DECODEU
R
CH.H
CH.L
TEST
ON
OFF
SORTIE
ANTENNE
ENTREE
ANTENNE
)
1 3
2
4
5
REAR
!POWER ON/OFF
@EJECT
#CHANNEL SELECTION ¡
$CHANNEL SELECTION ¡
%RECORD AND OTR
(ONE TOUCH TIMER RECORDING)
^PLAY
&STOP
*REWIND/REVIEW
(FAST FORWARD/CUE
)AUX/POUR TV JACK
1DECODER JACK
2RF OUTPUT CHANNEL ADJUSTMENT SCREW
3TEST SIGNAL ON/OFF SWITCH
4ANTENNA INPUT TERMINAL
5ANTENNA OUTPUT TERMINAL
5
SECTION 2. ELECTRICAL ADJUSTMENTS
2-1. VIDEO CIRCUIT ADJUSTMENTS METHODS
1. REC EQ ADJUSTMENT
• Connection Method
• Adjustment Procedure
1) Set the INPUT mode to LINE mode.
2) Supply the SECAM MAGENTA signal to the VIDEO IN TERMINAL.
3) Set the VCR to the STOP mode.
4) Connect the oscilloscope to TJ401 and trigger the scope with the composite sync at TJ313
5) Adjust RL491 in order to correspond with MAGENTA EDGE section
Adj. Location Checking Point Measuring Equipment Mode INPUT SIGNAL
RL491 TJ401 Signal Gen, Oscilloscope STOP SECAM MAGENTA
signal
TJ401 TJ313 RL491
ICL01
VIDEO PCB
VIDEO SET
SECAM MAGENTA
Signal
TOP VIEW
CH-1
OSCILLOSCOPE
CH-2
SIGNAL
GENERATOR
Horizontal: 10µs/div
vertical : 500mv/div
6
2. PB EQ ADJUSTMENT
• Connection Method
• Adjustment Procedure
1) Set the INPUT mode to LINE mode.
2) Playback the SECAM test tape (DS-1).
3) Set the VCR to PLAY mode.
4) Connect the Oscilloscope to TJ402 and trigger the scope with the composite sync at TJ313.
5) Adjust RL492 in order to correspond with MAGENTA EDGE section.
TJ402 TJ313 RL492
ICL01
CH-1
OSCILLOSCOPE
CH-2
TOP VIEW
VIDEO PCB
Adj. Location Checking Point Measuring Equipment Mode Test Tape
R492 TJ402 Signal Gen, Oscilloscope PLAY DS-1
Horizontal: 10µs/div
vertical : 100mv/div
7
2-2. AUDIO CIRCUIT ADJUSTMENT METHOD
1. AUDIO RECORD BIAS
• Connection Method
• Adjustment Procedure
1) Set the INPUT mode to LINE mode.
2) Disconnect any input
3) Connect the Audio level meter to both TP1 and TP2
4) After inserting a blank tape, record in SP mode.
5) Adjust R292 to obtain 3.0 mVrms.
TOP VIEW
R292
3.0mVrms
+
–
A/C HEAD
TP2
(–)
TP1
(+)
Audio LEVEL METER
MAIN PCB
Adjustment Parts Checking Point Measuring Equipment MODE INPUT SIGNAL
R292 A/C Head PCB Audio level meter REC No signal
TP1(+), TP2(-)
2-3. IF MODULE CIRCUIT ADJUSTMENT METHODS
1. PAL/SECAM-L HIGH BAND AFT
• PAL/SECAM HIGH BAND AFT
IF MODULE PCB (TOP VIEW)
• Adjustment Procedure
1) Connect the attached circuit to PIN !of P102.
2) Supply +12V to PIN$, +5V to PIN%and GND to PIN@ of P101.
3) Supply +5V to PIN# of P101and +5V to PIN%of P102. (SECAM-L MODE)
4) Connect the signal generator output to PIN!, and GND to PIN@ of P101.
5) Connect the oscilloscope probe to check point.
6) Adjust L102 to obtain 2.5V ±0.15V DC Voltage at check point.
ADJUSTMENT PARTS
CHECK POINT TEST EQUIPMENT INPUT SIGNAL
P102 Signal Gen. Refer to
L102 PIN!Oscilloscope the
Power Supply following.
2.5V ± 0.15V DC
Q110 Q106
Z104
R192
R191 Z101
IC102
Q101
Q102
R193
L102
P102
#5 #2 #1
Z102
P101
#5 #4 #3 #2
#1
#2
#4
2.2µ/50V 56K 2.2µ/50V
27K
15K
+12V
0.47µ/50
10K
+5V TEST CIRCUIT
for AFT and RF AGC
adjustment.
CH1
OSCILLOSCOPE
#1
0.5 mS/DV
50 mV/DIV (10:1)
10K
Modulation method: 30% AM
Af: 400 Hz
fc: 38.9 MHz
Signal Level: 80 dBuV
SIGNAL GEN.
GND
OUTPUT
8
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7
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