Roadstar vdr-6205k User manual

Service Manual - VDR-6205K
Service Manual - VDR-6205K
VDR-6205K
R

1-1
A AC :Alternating Current
ACC :Automatic Color Control
ACSS :Automatic Channel Setting System
ADJ :Adjust
A/E :Audio Erase
AFC :Automatic Frequency Control
AFT :Automatic Fine Tuning
AGC :Automatic Gain Control
A.H.SW :Audio Head Switch
ALC :Automatic Level Control
AM :Amplitude Modulation
AMP :Amplifier
ANT :Antenna
APC :Automatic Phase Control
ASS’Y :Assembly
AUX :Auxiliary
B B :Base
BGP :Burst Gate Pulse
BPF :Bandpass Filter
BS :Brodcasting Satellite
BW or B/W :Black and White
C C :Capacitor, Chroma, Collector
CAN :Cancel
CAP :Capstan
CAP.BRK :Capstan Brake
CAP.RVS :Capstan Reverse
CATV :Cable Television
CBA :Circuit Board Assembly
CCD :Charge Coupled Device
C.CTL :Chro Control, Capstan Control
CFG :Capstan Frequency Generator
CHROMA :Chrominance
CNR :Chroma Noise Redution
COMB :Combination
Comb Filter
COMP :Comparator
Composite
Compensation
CONV :Converter
C.ROT SW :Color Rotary Switch
CS :Chip Selcet
C.SYNC :Composite Synchronization
CTL DIV :Control Divide
CUR :Current
CYL :Cylinder
D D :Drum, Digital, Diode, Drain
D.ADJ :Drum Adjust
DC :Direct Current
D.CTL :Drum Control
DEMOD :Demodulator
DET :Detector
DEV :Deviation
DHP :Double High Pass
DIGITRON :Digital Display Tube
DL :Delay line
DOC :Drop Out Compensator
DUB :Dubbing
D.V SYNC :Dummy Vertical Synchronization
E E :Emitter
EE :Electric to Eletric
EMPH :Emphasis
ENA :Enable
ENV :Envelope
EP :Extended Play
EQ :Equalizer
EXP :Expander
F F :Fuse
FB :Feed Back
FBC :Feed Back Clamp
FE :Full Erase
FG :Frequency Generator
FL :Filter
FM :Frequency Modulation
F/R :Front/Rear
FS :Frequency Synthesizer
FSC :Subcarrier Frequency
F/V :Frequency Voltage
G GEN :Generator
H H :High, Horizontal
I IC :Integrated Circuit
IF :Intermediate Frequency
INS :Insert
L L :Low, Left, Coil
LD :LED
LD VTG CTL :Loading Voltage Control
LECHA :Letter Character
L.M :Level Meter
LP :Long Play
LPF :Low Pass Filter
M MAX :Maximum
MD :Modulator
MECHA.CTL :Mechanism Control
MIC :Microphone
MIN :Minimum
MIX :Mixer, Mixing
M.M. :Monostable, Multivibrator
MMV :Mono Multi Vibrator
MOD :Modulation, Modulator
MODEM :Modulator-Demodulator
MPX :Multiplex
N NR :Noise Reduction
O OSC :Oscillator
OSD :On Screen Display
P PB :Playback
PCB :Printed Circuit Board
P.CTL :Power Control
PRE-AMP :Preamplifier
P.F :Power Failure
PG :Pulse Generator
PLL :Phase Locked Loop
PREM.DET :Premire Detect
P.P :Peak-to-Peak
PS :Phase Shift
PWM :Pulse Width Modulation
PWR CTL :Power Control
Q Q :Transistor
QH :Quasi Horizontal
QSR :Quick Setting Record
QTR :Quick Timer Record
QV :Quasi Vertical
R R :Resistor, Right
RE(or RC) :Remocon, Receiver
REC :Recording
REC S ‘H’ :Record Start ‘Hight’
REF :Reference
REG :Regulated, Regulator
REMOCON :Remote Control(unit)
RF :Radio Frequency
R/P :Record/Playback
RTC :Reel Time Counter
S S :Serial
S.ACCEL :Slow Accel
SAOP :Second Audio Program
SC :Scart, Simulcast
S.DET :Secam Detect
SH :Shift
SHARP :Sharpness
SIF :Sound Intermediate Frequency
SLD :Side Locking
S/N :Signal to Noise Ratio
SP :Standard Play
ST :Stereo
SUB :Subtract, Subcarrier
SW or S/W :Switch
SYNC :Synchronization
SYSCON :System Control
T T :Coil
TP :Test Point
TR :Transistor
TRK :Tracking
TRANS :Transformer
TU :Tuner, Take-up
U UHF :Ultra High Frequency
UNREG :Unregulated
V V :Volt, Vertical
VA :Always Voltage
VCO :Voltage Controlled Oscillator
VGC :Voltage Gain Control
VHF :Very High Frequency
V.H.SW :Video Head Switch
VISS :VHS Index Search
VPS :Video Program System
VR :Variable Resistor or Volume
V-SYNC :Vertical Synchronization
VTG :Voltage
VV :Voltage to Voltage
VXO :Voltage X-tal Oscillator
W W :Watt
WHT :White
W/O :With out
X X-TAL :Crystal
Y Y/C :Luminance/Chrominance
YNR :Luminance Noise Reduction
Z ZD :Zener Diode
SECTION1 SUMMARY
KEY TO ABBREVIATIONS

1-2
Prior to shipment from the factory, the products are strictly inspected to confrom with the recognized product
safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such com-
pliance, it is equally important to implement the following precautions when a set is being serviced.
• Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and
certain parts of the product. When performing service, be sure to read and comply with these and other
cautionary notices appearing in the operation and service manuals.
2. Parts identified by the symbol and shaded (
Y ) parts are critical for safety.
Replace only with specified part numbers.
Note : Parts in this category also include those specified to comply with X-ray emission standards for
products using cathode ray tubes and those specified for compliance with various regulations
regarding spurious radiation emission.
3. Use Specified internal wiring. Note especially:
1) Double insulated wires
2) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulation sheets for transistor
5. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check that replaced wires do not contact sharp edged
or pointed parts.
7. 1) When a power cord has been replaced, check
that A mark is made on the cord, under strain,
near the aperture, and the flexible cord is
subjected 100 times to a pull of 40N for a duration
of 1 second each.
2) During the test, the cord shall not be displaced by
more than 2mm
8. Also check areas surrounding repaired locations.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power code

1-3
Fig. 3
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.
• Insulation resistance test
confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Dielectric strength test
Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and
audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between sol-
dered terminals, and between terminals and sur-
rounding metallic parts. See table below.
Table 1 : Ratings 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.
• 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, micro-
phone jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B(earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See figure and following table.
Table 2:Leakage current ratings for selected areas.
Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and
Note. locality.
Chassis
d
a
Primary circuit terminals
Exposde
accessible
part Z
Load AC Voltmeter
Earth Ground,
Power cord plug prongs
B
Fig. 2
AC Line Voltage
AC Line Voltage
100 to 130 V
200 to 240 V
*100 to 130 V
*200 to 240 V
Europe
Australia
Europe
Australia
Other terminals
Antenna earth
terminals
i E0.7m A peak
i E2m A DC
i E0.7m A peak
i E2m A DC
F10 MΩ/500 V DC 4kV 1 minute F6mm(d)
F8mm(d)
(a Power cord)
Region Load Z Leakage Current(i) Earth Ground
(B) to :
Region Insulation
Resistance Dielectric Strength Clearance
Distance(d),(d)
2kΩ
50kΩ

1-4
In case that defective EEPROM of PAL models is replaced, to operate these sets from the initial state MP KEY
must be repaired as well before delivering to the customer.
If MP KEY isn’t repaired the setting of RF OUT channel or LANGUAGE might be different from that for cus-
tormer’s country.
•MP KEY : In case of PAL VCR if holding the REC button on the front panel and the CLEAR button on the
remote control handset for 5 ~ 7 seconds with power being switch all and no tapes,
OK is displayed at FLD for FLD models and LED becomes on for LED CLOCK models.
This is the state that initializing EEPROM is finished.
(In case of PAL VCP if holding the REC button on the front panel and the MENU button on the
remote control handset for 5 ~ 7 seconds with power being off and no tapes, All the LED DOTs
become on. This is the state that initializing EEPROM is finished.)
•MP KEY's function : MP KEY sets EEPROM's data up to the initial state.
SERVICE NOTICE ON REPLACING EEPROM
TIMER
AM
REC
VCR
OK
• FLD MODEL:
MP KEY “OK”
• LED CLOCK MODEL:
MP KEY Switch all on a Light
• LED DOT MODEL:
MP KEY Switch all on a Light

2-1
SECTION2 CABINET & MAIN FRAME
Fig.2-1
SERVICE METHOD
(1) Disassembly Flow
(Positioned Upside Down)
(2) Re-assembly Flow for service like Fig. 2-1
(3)To check and replace Electrical parts
1Disassemble the unit according to
No.1) Disassembly Flow.
2Re-assemble the unit according to
No.2) Re-assembly Flow.
3Place the unit like Fig. 2-1
4 Check and replace Electrical parts.
NOTE :
1Insert Video Cassette Tape inversely like Fig. 2-1
to check and replace defective parts.
2In disassembling and reassembling, be careful not
to damaged CST switch.
Top Case
Bottom Cover
Front Panel
Housing & Deck
Assembly
Main C.B.A
LED C.B.A
Display C.B.A
Main C.B.A
Housing & Deck
Assembly
LED C.B.A
Housing & Deck Ass'y
Cassette Tape
(Upside Down)
Main C.B.A

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
457
457 457 457 457
457
260
330
A43
A46
283
280
PBLED
284
452
323
320
275
Tu701
SW701
250 462
462
457
457
452
300
276
A
5
4
3
2
1
BCD

2-3
2.Packing & Accessory Section
• Cabinet & Main Frame Section Parts List
801
808
INSTRUCTION ASS'Y
BATTERY
810
CABLE SET ASS'Y
803
PACKING ASS'Y
804
SHEET CUSHION
802
BOX CARTON
(Optional Parts)
900
REMOCON
NOTE) Refer to “SECTION 5 REPLACEMENT PARTS LIST”
NOTE) in order to look for the part number of each part.

2-4
3.Remote Control Section
• Remote Control Section Parts List
• Packing Accessory Section Parts List
901
900 902
906
905
904
903
907

3-1
Electronic Test Equipment
ABBREVIATIONS
1. Servo Circuit
1)PG Adjustment Purpose: For the phase dividing of the Video A,B heads with
180° and the exact tracking of each track to meet
head switching point with VHS Spec.
Procedure:
a. Playback a PAL SP test tape.
(At this time, the “ART” is lighting, after pressing
the A. TR(+) or A. TR (-) and adjust the X-Value).
b. Connect CH-1 terminal of oscilloscope to W401 or
W402(H.SW) and CH-2 terminal to Video Out
Jack of the unit.
c. Trigger the complex Video signal of CH2 to CH-1
(H.SW), and adjust VR501 so that the distance
from A(B) head selection point of H.SW signal to
the starting point of Vertical synchronized signal is
416µsec !32µsec.
Reference:
1. !PG adjustment is practiced in the state of
maximum RF level and locked servo system.
2. The deviation between A/B Head Adjustment
location should be within !20µsec.
3. The deviation between the specification of
adjustment and the practical measurement value
should be within !20µsec.
4. Oscilloscope and VCR set should be connected
with GND.
WAVEFORM
Composite Video Signal
• MODE : Playback
• SPEC : 416µsec !32µsec
• M.P : W401 OR W402 (H.SW)
Video Out Jack
• A.P : VR501
Fig. 3-1
Fig. 3-2
• Oscilloscope
• Video Signal Generator
• Level Meter
• + Driver
• Test Tape (SP)
• Recording Tape
• Digital Multimeter
• Monitor Scope
• Power Supply
• SPEC : SPECIFICATION • M.P : MEASUREMENT POINT • A.P : Adjustment Point
Waveform
VIDEO OUTPUT SIGNAL
CH-1 CH-2
OSCILLOSCOPE
CTL
VR 501
IC 501
IC 301
V.OUT JACK
(JACK 301)
H/SW RF
2)Connection Diagram
SECTION3 ELECTRICA
ELECTRICAL ADJUSTMENT PROCEDURES
(Solder side)

3-21 3-22
CIRCUIT DIAGRAMS
1. Power(SMPS) Circuit Diagram
No Power.
BDP01 is defective.
No Power.
ICP02, 03 are malfunctioned. 5V dead.
QP02, 03, 04 are defective.
9V dead.
QP01 is defective.
12VA No Power.
DP06 is defective.
12V dead.
QP06 is defective.

3-15 3-16
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
LP01
FILTER BRIDGE
RECTI-
FIER
F101
T1.6AL/250V
AC 100~240V
SNUBBER
CIRCUIT
ICP02
1CP01
SWITCH
-ING
1
2
3
5
11
10
7
9
6
1
2
3
4
5
41
2
3
REFERENCE
ICP03
RECTIFIER
DP03
DETECT
RECTIFIER
DP06
ICP04
REGULATOR
6VA
FP02
PTP01
T2A/250V
QP01
QP02
QP04
QP05
Y/C.SYSTEM
5.3VA
CAPSTAN
13.5VA
Y/C.BUFFER
9V
Y/C. MOD
AUDIO.SYSTEM
DC JACK
JK03
QPO6
REGULATOR
REGULATOR
REGULATOR
& SW
QP03
SYSTEM
PWR CTL'H'
DRUM 12VA
REGULATOR
& SW

3-23 3-24
2. SYSTEM CIRCUIT DIAGRAM
7 6 84 5 10 9
1
2
3
WAVE FORM
IC502 is defective.
Loading/Unloading operation is abnormal.
S501, S502, Q514, Q515 are defective.
Audio stop occurs.
ES501, ES502, LD501
are defective.
Tape remain dead.
Auto REW is not operate.
IC504 is defective.
•Reset defect.
•Set Dead
X501 is defective.
IC501 is not operate.
X503 is defective.
Menu & F.OSD are not operate.
Q901~Q905 are defective.
Each LED are not operate.

3-19 3-20
4. SYSTEM BLOCK DIAGRAM
77
76
8
4
233 49 71 22
41
16
IC501
GMS3974
MODE S1
MODE S2
MODE S3
MODE S4
T-UP Reel
CST IN
Vss (A/D)
Vss (SERVO)
Vss (OSD)
Vss (SYSCON)
Vcc (SYS)
Vcc (SERVO)
CAP. PWM
CTL +
CTL -
DFG CFG
CAP. REV 'H'
CAP. ADJ
DRUM ADJ
V. ENV
V.H/SW30
MODE S/W MS501
TO/ FROM AVCP/SECAMTO/ FROM AVCP/SECAM
T-UP END
T-UP REEL
SUP REEL
CST. TAB SW.
5.3VA
5.3VA
RS501
RS502
CS501
R544 R548 R5C6
C552
5.3VA
5.3VA
LD501
DECK IR LED
C.ROTARY
DPG
D.V.Sync
X501
PML01
10MHz
17,73447MHz
OSC 72
73
OSC
OSC2
4fsc in
4fsc out
OSC1
CHAR.
OSC
51
50 DOSC IN
DOSC OUT
53
52
T-UP SENSOR
1
X503
M
LD +
LD 2
1
L/D MOTOR 12V 19 LD (-)
LD (+)
20
5
6
4
7
8
1
10
Vcc 1
Vcc 2
OUT 1
C529 OUT 2
GND
IN 2
IN 1
V ref
IC502
ZD501
2
31 32 38 40 61
78
80 81 12 24 2826 39 2725
DRUM PWM
REG 9V
1
2
RESET
GND
Vcc
3
IC504
3SUP SENSOR
SUP END
82 15
R/C
PM901
5
1
P9M01
R/C
+
+
Vcc (A /D)
96
97
98
79
59
54
43
REC LED
LP / EP LED
PLAY LED
CST IN LED
REC START 'H'
7
SECAM DET 'H'
85
SE / MES 'H' 62
A. MUTE 'H' 90
CLK 91
DATA
OSD 'H'
I - LIMIT
C. SYNC
45
C.Vout
C.Vin
TO/ FROM DECKTO/ FROM DECK
R550 R551
C536
R557
R555
R554
R553
R556
R559
Q515
R558
R552
R5C5
R526
R525
R5C7
C535
C534
R560
R564
C537
C505
C501
C521
C516
C500
+C561
C506
L502
ZD506
ZD503
ZD502
ZD507
ZD504
ZD505
C538
C539
99
STAND-BY LED
13
KEY RTN 0
14
KEY RTN 1
Vcc (OSD) 42
75
74
C504 C503
C531
R516
PM901,902
KEY SW
KEY SW
LEDP9M01, M02
ES501
ES502
95
+
+
Q514
5SUP Reel
+
+
Q522

3-25 3-26
3. A/V CIRCUIT DIAGRAM
PB AUDIO PB Y C
PB Y
PB C
REC Y C
REC Y
REC C
REC AUDIO
515
14
9
10
3 6
2
2
7
16
13
11
8
12
1
4
WAVE FORM
Q402,403,404 are
defective.
PB Audio failed.
IC301 Pin is
defective.
Auto Tracking is failed.
TL401 is defective.
Audio & Screen is bad
in Self-Record mode.
IC301 Pin defective.
PB Color signal disappear.
X301, X302 are defective.
PB Color Signal disappear.
IC301 Pin defective.
Record is failed.
IC301 Pins , defective.
PB and Recording is failed.
Q301, Q302 are defective.
PB screen is bad.

3-17 3-18
2. AUDIO BLOCK DIAGRAM 3. Y/C BLOCK DIAGRAM
1) PB Mode
2) REC Mode
1) PB Mode
2) REC Mode
IC301
AUDIO
4
3
1001 96 75
EQ
AMP
LINE
AMP
A. OUT
JACK
AUDIO
HEAD
AUDIO
PB EQ
MUTE
5V
TRAP
CIRCUIT
ACC C. COMB LPF Y
DELAY
MAIN
CONV
C LPF
PB EQ
LPF
MOD
V. OUT
MD 301
JK 301
YNR NL
DE EMP Y/C
MIX
60dB AMP
CLAMP
DOUBLE
LIMIT
PB
PEAKING MAIN DE-EMPH
V.H S/W
CLOCK DATA C SYNC Y/C
VIDEO OSD VIDEO
VIDEO
MIX V. OUT BUFFER
PB FM
AGC FM
DEM SUB
LPF
SP 'B' PB
SP 'A' PB
V. ENV
COLOR
ROTARY
88
57 59 54 52 51 61 72 71
46
45
43
41
91
93
10 18 17 21 20 23 24 28 29 1
11
IC301
LA71570M
SP REC
IC 301
LA71570 M
COLOR
ROTARY V. II S/W CLOCK DATA
C. SYNC REC 'H'
Y/C VIDEO
(TO DRUM) 90
71 72 61 51 52 54 57 59
46
45
43
41
38
32
31
302928242319181110
+
REC FM
EQ
FM
MOD W/D
CLIP
MAIN
EMPH
AGC
FBC
NL EMPH
DETAIL
ENH Y-LPF
YNR
BPF1
C. COMB
BPF Y
DELAY
COMB
AMP
CCD
LPF
S/W
V. IN
JK 301
76
96
98 7
99
A. IN
JACK
ALC
MUTE
AUTO BIAS
A. OUT
LINE
AMP
REC
AMP
PB/REC
S/W
REC 'H'
IC301
AUDIO
AUDIO
HEAD
BIAS
OSC
5
2