Durabrand DCV203 User manual

SERVICE MANUAL
VIDEO CASSETTE RECORDER
Sec. 1: Main Section
ISpecifications
IPreparation for Servicing
IAdjustment Procedures
ISchematic Diagrams
ICBA’s
Sec. 2: Deck Mechanism Section
IStandard Maintenance
IAlignment for Mechanism
IDisassembly/Assembly of Mechanism
IAlignment Procedures of Mechanism
Sec. 3: Exploded views
and Parts List Section
IExploded views
IParts List
DCV203
DCV603
CHANNEL
POWER
TAPE IN TIMER REC
MENU
VCR/TV
POWER
VIDEO AUDIO
REC/OTR REW
F.FWD
STOP/EJECT
PLAY
MENU
CHANNEL
POWER
REC/OTR
/STOP
EJECT
REW
PLAY
F.FWD
TAPE IN
VIDEO L-AUDIO -R
TIMER RECVCR/TVPOWER

IMPORTANT SAFETY NOTICE
Proper service and repair is important to the safe, reliable operation of all
Funai Equipment. The service procedures recommended by Funai and
described in this service manual are effective methods of performing service
operations. Some of these service special tools should be used when and as
recommended.
It is important to note that this service manual contains various CAUTIONS
and NOTICES which should be carefully read in order to minimize the risk of
personal injury to service personnel. The possibility exists that improper ser-
vice methods may damage the equipment. It also is important to understand
that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai could not
possibly know, evaluate and advice the service trade of all conceivable ways
in which service might be done or of the possible hazardous consequences of
each way. Consequently, Funai has not undertaken any such broad evalua-
tion. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by Funai must first use all precautions thoroughly so that nei-
ther his safety nor the safe operation of the equipment will be jeopardized by
the service method selected.

MAIN SECTION
VIDEO CASSETTE RECORDER
DCV203/DCV603
TABLE OF CONTENTS
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1-1
Important Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-1
Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1
Preparation for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4-1
Operating Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1
Cabinet Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1
Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1
Function Indicator Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-11
Power Supply Trouble Shooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-12
Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1
System Control Timing Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1
IC Pin Function Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1
Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1
Sec. 1: Main Section
ISpecifications
IPreparation for Servicing
IAdjustment Procedures
ISchematic Diagrams
ICBA’s

1-1-1 HD230SP
SPECIFICATIONS
Note: Nominal specs represent the design specs. All units should be able to approximate these – some will exceed
and some may drop slightly below these specs. Limit specs represent the absolute worst condition that still might
be considered acceptable; In no case should a unit fail to meet limit specs.
Description Unit Minimum Nominal Maximum Remark
1. Video
1-1. Video Output (PB) Vp-p 0.8 1.0 1.2 SP Mode
1-2. Video Output (R/P) Vp-p 0.8 1.0 1.2
1-3. Video S/N Y (R/P) dB 40 45 SP Mode,
W/O Burst
1-4. Video Color S/N AM (R/P) dB 37 41 SP Mode
1-5. Video Color S/N PM (R/P) dB 30 36 SP Mode
1-6. Resolution (PB) Line 230 245 SP Mode
2. Servo
2-1. Jitter Low µsec 0.07 0.12 SP Mode
2-2. Wow & Flutter % 0.3 0.5 SP Mode
3. Normal Audio
3-1. Output (PB) dBV -9 -6 -3 SP Mode
3-2. Output (R/P) dBV -9 -6 -1.5 SP Mode
3-3. S/N (R/P) dB 36 41 SP Mode
3-4. Distortion (R/P) % 1.0 4.0 SP Mode
3-5. Freq. resp (R/P) at 200Hz dB -11 -4 SP Mode
(-20dB ref. 1kHz) at 8kHz dB -14 -4 SP Mode
4. Tuner
4-1. Video output Vp-p 0.8 1.0 1.2 E-E Mode
4-2. Video S/N dB 39 42 E-E Mode
4-3. Audio output dB -10 -6 -2 E-E Mode
4-4. Audio S/N dB 40 46 E-E Mode
5. Hi-Fi Audio [ DCV603 ]
5-1. Output dBV -12 -8 -4 SP Mode
5-2. Dynamic Range dB 70 85 SP Mode
5-3. Freq. resp (6dB B.W) Hz 20 ~ 20K SP Mode

1-2-1 SFTY_03
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evi-
dent from visual inspection, nor can the protection
they give necessarily be obtained by replacing them
with components rated for higher voltage, wattage,
etc. Parts that have special safety characteristics are
identified by a #on schematics and in parts lists. Use
of a substitute replacement that does not have the
same safety characteristics as the recommended
replacement part might create shock, fire, and/or other
hazards. The Product’s Safety is under review contin-
uously and new instructions are issued whenever
appropriate. Prior to shipment from the factory, our
products are carefully inspected to confirm with the
recognized product safety and electrical codes of the
countries in which they are to be sold. However, in
order to maintain such compliance, it is equally impor-
tant to implement the following precautions when a set
is being serviced.
Precautions during Servicing
A. Parts identified by the #symbol are critical for
safety. Replace only with part number specified.
B. In addition to safety, other parts and assemblies
are specified for conformance with regulations
applying to spurious radiation. These must also be
replaced only with specified replacements.
Examples: RF converters, RF cables, noise block-
ing capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1)Wires covered with PVC tubing
2)Double insulated wires
3)High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1)Insulation tape
2)PVC tubing
3)Spacers
4)Insulators for transistors
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely about the terminals before solder-
ing.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fus-
ible resistors, etc.).
G. Check that replaced wires do not contact sharp
edges or pointed parts.
H. When a power cord has been replaced, check that
5 - 6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Be careful that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to pre-
vent shock hazards.
Replacement procedure
1)Remove the old connector by cutting the wires at a
point close to the connector.
Important: Do not re-use a connector. (Discard it.)
2)Strip about 15 mm of the insulation from the ends
of the wires. If the wires are stranded, twist the
strands to avoid frayed conductors.
3)Align the lengths of the wires to be connected.
Insert the wires fully into the connector.
4)Use a crimping tool to crimp the metal sleeve at its
center. Be sure to crimp fully to the complete clo-
sure of the tool.
L. When connecting or disconnecting the internal con-
nectors, first, disconnect the AC plug from the AC
outlet.

1-2-2 SFTY_03
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 their original posi-
tions. Afterwards, do the following tests and confirm
the specified values to verify compliance with safety
standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current
between B (earth ground, power cord plug prongs)
and externally exposed accessible parts (RF termi-
nals, antenna terminals, video and audio input and
output terminals, microphone jacks, earphone jacks,
etc.) is lower than or equal to the specified value in the
table below.
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 the terminals of load
Z. See Fig. 2 and the following table.
AC Line Voltage Clearance Distance (d) (d’)
120 V ≥3.0 mm (0.118 inches)
Chassis or Secondary Conductor
dd'
Primary Circuit Terminals
Fig. 1
AC Voltmeter
(High Impedance)
Exposed Accessible Part
BEarth Ground
Power Cord Plug Prongs
Z
1.5kΩ
0.15µF
Fig. 2
Table 2: Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Voltage Load Z Leakage Current (i) Earth Ground (B) to:
120 V 0.15µF CAP. & 1.5kΩ RES.
Connected in parallel i≤0.5mA Peak Exposed accessible parts

1-3-1 NOTE_1
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indi-
cated as shown.
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
c. The 1st pin of every male connector is indicated as
shown.
Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect
the AC cord.
2. FFC (Flexible Foil Connector) cable should be
inserted parallel into the connector, not at an angle.
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
(1) Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
(2) Remove the flat pack-IC with tweezers while apply-
ing the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Caution:
1. Do not supply hot air to the chip parts around the
flat pack-IC for over 6 seconds because damage
to the chip parts may occur. Put masking tape
around the flat pack-IC to protect other parts from
damage. (Fig. S-1-2)
2. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Fig. S-1-1
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Fig. S-1-2

1-3-2 NOTE_1
With Soldering Iron:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(2) Lift each lead of the flat pack-IC upward one by
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
With Iron Wire:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(2) Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
(3) While heating the pins using a fine tip soldering
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA contact
pads as shown in Fig. S-1-5
(4) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(5) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Note:
When using a soldering iron, care must be taken
to ensure that the flat pack-IC is not being held by
glue. When the flat pack-IC is removed from the
CBA, handle it gently because it may be damaged
if force is applied.
Flat Pack-IC Desoldering Braid
Soldering Iron
Fig. S-1-3
Fine Tip
Soldering Iron
Sharp
Pin
Fig. S-1-4
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fig. S-1-5
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers
Fig. S-1-6

1-3-3 NOTE_1
2. Installation
(1) Using desoldering braid, remove the solder from
the foil of each pin of the flat pack-IC on the CBA
so you can install a replacement flat pack-IC more
easily.
(2) The “ I” mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
presolder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
Instructions for Handling
Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electro-
static charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is prop-
erly grounded to remove any static electricity that may
be charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate
with proper grounding (1MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on cloth-
ing will not escape through the body grounding band,
be careful to avoid contacting semi-conductors with
your clothing.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
Presolder
CBA
Flat Pack-IC
Fig. S-1-8
CBA
< Incorrect >
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
< Correct >

1-4-1 HD300PFS
PREPARATION FOR SERVICING
How to Enter the Service Mode
About Optical Sensors
Caution:
An optical sensor system is used for the Tape Start
and End Sensors on this equipment. Carefully read
and follow the instructions below. Otherwise the unit
may operate erratically.
What to do for preparation
Insert a tape into the Deck Mechanism Assembly and
press the PLAY button. The tape will be loaded into
the Deck Mechanism Assembly. Make sure the power
is on, TP502 (SENSOR INHIBITION) to GND. This will
stop the function of Tape Start Sensor, Tape End Sen-
sor and Reel Sensors. (If these TPs are connected
before plugging in the unit, the function of the sensors
will stay valid.) See Fig. 1.
Note: Because the Tape End Sensors are inactive, do
not run a tape all the way to the start or the end of the
tape to avoid tape damage.
TP502
S-INH
Q504
Q503
Fig. 1

1-5-1 HD230IB
1. EJECT button
2. NUMBER buttons
3. MENU button
4. RECORD button
5. SPEED button
6. REW button
7. STOP button
8. PLAY button
9. F.FWD button
10. DISPLAY button
11. PAUSE/STILL button
12. COUNTER MEMORY button
13. COUNTER RESET/EXIT button
14. AUTO REPEAT button
15. CHANNEL buttons
16. POWER button
17. VCR/TV button
()
19. AUDIO OUT jack
20. AUDIO IN jack
21. ANT. IN jack
22. ANT. OUT jack
23. VIDEO IN jack
24. VIDEO OUT jack
25. AC Power Cord
CHANNEL
POWER
TAPE IN TIMER REC
MENU
VCR/TV
POWER
VIDEO AUDIO
REC/OTR REW
F.FWD
STOP/EJECT
PLAY
1213 911 10 8 5 4 3 267
1
14 15 16 17 18
TAPE IN TIMER REC
VCR/TV
POWER
POWER
VCR/TVEJECT
CHANNEL
PAUSE
/STILL
EXIT
RESET
AUTO-
REPEAT
COUNTER
MEMORY
DISPLAYSPEED
STOP
PLAY
RECORD
MENU
REW
F.FWD
123
456
78
0
9
1
3
4
5
6
7
9
11
8
10
17
13
14
16
15
12
2
ANT
AUDI O
VIDEO
IN
OUT
OUT IN
25
19 20 21
24 23 22
Install two AA batteries
(supplied) matching the
polarity indicated on the
bottom of the remote
control.
1. Cassette Compartment
2. F.FWD button
3. PLAY button
4. REW button
5. STOP/EJECT button
6. REC/OTR button
7. MENU button
18. Display Window
19. Remote Sensor
10. CHANNEL buttons
11. POWER button
12. AUDIO Input jack
13. VIDEO Input jack
()
14. POWER indicator
15. VCR/TV indicator
16. TAPE IN indicator
17. TIMER indicator
18. REC indicator
VIDEO OUT Jack
Connect a video cable going to
the video in jack of a camcorder,
another VCR, a TV, or an audio-
visual system (laser disc player,
video disc player, etc.) here.
AUDIO OUT Jack
Connect the audio cable going
to the audio in jack of a cam-
corder, another VCR, a stereo
amplifier, or an audio system
here.
VIDEO IN Jack
Connect a video cable coming
from the video out jack of a
camcorder, another VCR, or an
audio-visual source (laser disc
player, video disc player, etc.)
here.
AUDIO IN Jack
Connect the audio cable coming
from the audio out jack of a
camcorder, another VCR, or an
OPERATING CONTROLS AND FUNCTIONS
[ DCV203 ]

1-5-2 HD230IB
1. EJECT button
2. NUMBER buttons
3. MENU button
4. RECORD button
5. SPEED button
6. REW button
7. STOP button
8. PLAY button
9. F.FWD button
10. DISPLAY button
11. PAUSE/STILL button
12. SLOW button
13. C.RESET/EXIT button
14. SEARCH-MODE button
15. CHANNEL buttons
16. POWER button
17. VCR/TV button
()
19. AUDIO OUT jacks
20. AUDIO IN jacks
21. ANT. IN jack
22. ANT. OUT jack
23. VIDEO IN jack
24. VIDEO OUT jack
25. AC Power Cord
MENU
CHANNEL
POWER
REC/OTR
/STOP
EJECT
REW
PLAY
F.FWD
TAPE IN
VIDEO L-AUDIO- R
TIMER RECVCR/TVPOWER
13 91110 812 543267
1
14 15 16 17 18
TAPE IN TIMER RECVCR/TVPOWER
POWER
VCR/TVEJECT
CHANNEL
PAUSE
/STILL
C.RESET
EXIT
SEARCH
-MODE
SLOW
DISPLAYSPEED
STOP
PLAY
RECORD
MENU
REW
F.FWD
123
456
78
0
9
1
3
4
5
6
7
9
11
8
10
17
13
14
16
15
12
2
ANT
AUDI O
VIDEO
IN
OUT
OUT IN
OUT
L
R
IN
25
19 20 21
24 23 22
Install two AA batteries
(supplied) matching the
polarity indicated on the
bottom of the remote
control.
1. Cassette Compartment
2. F.FWD button
3. PLAY button
4. REW button
5. STOP/EJECT button
6. REC/OTR button
7. MENU button
18. Indicators
19. Remote Sensor
10. CHANNEL buttons
11. POWER button
12. AUDIO Input jacks
13. VIDEO Input jack
()
14. POWER indicator
15. VCR/TV indicator
16. TAPE IN indicator
17. TIMER indicator
18. REC indicator
VIDEO OUT Jack
Connect a video cable going to
the video in jack of a camcorder,
another VCR, a TV, or an audio-
visual system (laser disc player,
video disc player, etc.) here.
AUDIO OUT Jacks
Connect the audio cables going
to the audio in jacks of a cam-
corder, another VCR, a stereo
amplifier, or an audio system
here.
VIDEO IN Jack
Connect a video cable coming
from the video out jack of a
camcorder, another VCR, or an
audio-visual source (laser disc
player, video disc player, etc.)
here.
AUDIO IN Jacks
Connect the audio cables com-
ing from the audio out jacks of a
camcorder, another VCR, or an
[ DCV603 ]

1-6-1 HD300DC
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and
dress the cables as they were originally.
2. Disassembly Method
(1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
Reference Notes
CAUTION: Locking Tabs (L-1) and (L-2) are fragile. Be
careful not to break them.
1. Remove five Screws (S-2). Then slowly lift the VCR
Chassis Unit (Deck Assembly and Main CBA) up.
2. When reassembling, solder wire jumpers as shown
in Fig. D4.
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. D5. Then, install the Deck Assembly while
aligning the hole of Cam Gear with the pin of LD-
SW, the shaft of Cam Gear with the hole of LD-SW
as shown in Fig. D5.
ID/
LOC.
No.
PART
REMOVAL
Fig.
No.
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Note
[1] Top Case D1 4(S-1) -
[2] Front
Assembly D2 *3(L-1),*4(L-2) -
[3]
VCR
Chassis
Unit
D3 5(S-2) 1
[4] Deck
Assembly
D4,
D5 3(S-3), Desolder 2,3
[5] Main CBA D4,
D5 ---------- -
↓
(1)
↓
(2)
↓
(3)
↓
(4)
↓
(5)
[1] Top Case
[2] Front Assembly
[3] VCR Chassis Unit
[4] Deck Assembly
[5] Main CBA
[1] Top Case
(S-1)
Fig. D1

1-6-2 HD300DC
(L-2)
(L-1)
[2] Front
Assembly
(L-2)
Fig. D2
(S-2)
(S-2)
[3]VCR
Chassis Unit
Fig. D3
(S-3)
(S-3)
(S-3)
[4] Deck
Assembly
FE Head Cylinder
Assembly
AC Head
Assembly
[5] Main CBA
BOTTOM VIEW
From
FE Head
From
Cylinder
Assembly
From
AC Head
Assembly
Lead with
blue stripe
Printing
side
Lead with
blue stripe
From
Capstan
Motor
Assembly
Lead connections of Deck Assembly and Main CBA
Desolder Desolder
Fig. D4

1-6-3 HD300DC
LD-SW Pin
Hole
Hole
Shaft
Cam Gear
[5] Main CBA
[4] Deck Assembly
[5] Main CBA
SW507
LD-SW
Pin
Fig. D5

1-7-1 U27NEA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."
NOTE:
1.Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to do these adjustments only after
all repairs and replacements have been com-
pleted. Also, do not attempt these adjustments
unless the proper equipment is available.
2.To perform these alignment / confirmation proce-
dures, make sure that the tracking control is set in
the center position: Press either "CHANNEL L5??" or
"CHANNEL K" button on the front panel first, then
the "PLAY" button on the front panel.
Test Equipment Required
1.Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div.,
F-Range: DC~AC-20MHz
2.Alignment Tape (FL8A)
Head Switching Position Adjust-
ment
Purpose:
To determine the Head Switching point during
playback.
Symptom of Misadjustment:
May cause Head Switching noise or vertical jitter
in the picture.
Reference Notes:
Playback the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output wave-
form is at the 6.5H(412.7µs) delayed position from the
rising edge of the CH2 head switching pulse wave-
form.
Test point Adj.Point Mode Input
TP751(V-OUT)
TP302(RF-SW)
GND
VR501
(Switching Point)
(MAIN CBA)
PLAY
(SP) -----
Tape Measurement
Equipment Spec.
FL8A Oscilloscope 6.5H±1H
(412.7µs±60µs)
Connections of Measurement Equipment
Oscilloscope
Main CBA
TP751
CH1 CH2
Trig. (+)
GND
TP302
Figure 1
EXT. Syncronize Trigger Point
1.0H
CH1
CH2
Switching Pulse
6.5H
V-Sync
0.5H

M
M
LOADING
MOTOR
CYLINDER ASSEMBLY
SENSOR CBA
SENSOR CBA
CAPSTAN MOTOR
DRUM
MOTOR
PG
SENSOR
CONTROL
HEAD
CL504
CL502
CN504
AC HEAD ASSEMBLY
MAIN CBA
KEY- 2
RF-SW
C-FG
C-CONT
D-PFG
ST-S
T-REEL
C-F/R
KEY- 1
D-V SYNC
C-SYNC
V-ENV
REMOCON-IN
CTL(+)
RESET
C-ROTA
D-REC-H D-REC-H
D-PB-L
REC-
SAF-SW
PG-DELAY
A-MUTE-H A-MUTE-H
A-MUTE-H
RF-SW
D-V SYNC
C-SYNC
V-ENV
TRICK-H
C-ROTA
END-S
IC501
(SERVO/SYSTEM CONTROL)
5
47
56
CTL
58
CTL(-)
57
28
49
69
62
3
20
27
65
18
78
64
19
41
11
2
24
7
66
67
RS501
REMOTE
SENSOR
LM-FWD/REV
21
D-CONT29
(DECK ASSEMBLY)
Servo/System Control Block Diagram BLOCK DIAGRAMS
END-S
T-REEL
T-REEL
ST-S
ST-S
Q504
Q503
Q501
RESET
Q506
SW-POINT
AL+5V
VR501
TIMER+5V
TP506 TP505
D-PB-L
TRICK-H SP/LP/SLP
26
SP/LP/SLP
P-ON-L
22
P-ON-L P-DOWN-L
1
P-DOWN-L
H-A-SW
79
H-A-SW H-A-COMP
80
H-A-COMP
D-PB-L
D-REC-H
SW511
REC SW
FROM/TO
VIDEO BLOCK
TO AUDIO
BLOCK
FROM/TO
Hi-Fi AUDIO
BLOCK
1 1KEY 2 KEY SWITCH
CL507 CN651
FUNCTION CBA
1-8-1 1-8-2 HD230LS
WF6
WF7
CLOCK
DATA
TU701(TUNER UNIT)
23 INSEL/ST-SL
INSEL/ST-SL 16
11
12
VCR/TV5
VCR/TV-IND 72
TIMER-IND 75
REC-IND 70
REC-IND 71
D562 VCR/TV
D563 TAPE IN
D564 TIMER
D565 REC
D561 POWER
AL+5V
P-ON+9V
Q563
Q562
P-ON+5V
LD-SW68
AL+12V
AL+5V
CAS-IND 74
VCR/TV-IND 73
AL+5V
SW512
AL+12V
AL+15V
P-ON+5V
LD-SW
AL+5V
D555
S-LED
FROM/TO
POWER
SUPPLY
BLOCK
IIC-BUS SCL
IIC-BUS SDA
12
13IIC-BUS SCL
77
VCR/TV
IIC-BUS SDA
NORMAL-H
ST/SAP-MODE
61
59
Hi-Fi-H-SW
Hi-Fi/NOR-IN
ST/SAP-IN
Hi-Fi-H-SW 25
KEY
SWITCH
KEY
SWITCH
TP502
S-INH
M
CAPSTAN
MOTOR
5 CTL(+)
6 CTL(-)
1AL+12V
2P-ON+5V
3C-FG
4C-F/R
5C-CONT
6GND
7
LM-FWD/REV
8D-CONT
9D-PFG
10 GND
11 AL+12V
12 AL+15V
TP513
CTL
IC571
(FIP DRIVER)
DISP-DATA
DISP-CLK
DISP-ENA
DISP-DATA
DISP-CLK
DISP-ENA
FP502
LED CLOCK
G1
G2
G3
G4
A
B
H
I
J
23
22
21
28
2
1
68
69
70
20
14
16
17
7
8
DCV603

L
R
LUMINANCE
SIGNAL PROCESS
MAIN CBA
Video Block Diagram
VIDEO (R)-1 HEAD
VIDEO (L)-1 HEAD
1-8-3 1-8-4 HD230BLV
(DECK ASSEMBLY)
V(R)-1
V-COM
V(L)-1
CL253
1
2
3
V(L)-2
V-COM
V(R)-2
4
5
6
JK751
V-OUT
Q391
JK753
FRONT V-IN
TP751
V-OUT
TU701
(TUNER UNIT)
VIDEO-IN
VIDEO-OUT
6
18
JK752
REAR V-IN
V-AGC
TUNER
FRONT
REAR
R P
R
P
SYNC
SEPA
FBC
Y/C
MIX
CCD 1H
DELAY
R
P
DOC YNR Y/C COMB
CHROMINANCE
SIGNAL PROCESS
IC301
(VIDEO SIGNAL PROCESS/ HEAD AMP) 35
REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC
13
88
89
90
91
42
40
CHARA
MIX
6dB
AMP
ENV
DET
AGC
AMP
HPF
FROM/TO
SERVO/SYSTEM
CONTROL BLOCK
FROM/TO
SERVO/SYSTEM
CONTROL BLOCK
CYLINDER ASSEMBLY
R
L
RF-SW
RF-SW
93
V-ENV
H-A-SW
H-A-COMP H-A-COMP
TP302
WF2
VIDEO (L)-2 HEAD
VIDEO (R)-2 HEAD
TP301
C-PB
BUFFER
49
H-SYNC
D-V SYNC
C-SYNC
BLUEBACK-ON BLUEBACK-ON
SP/LP/EP SP/LP/EP
ROTA
D-V SYNC
C-SYNC
ROTA
34
14
36
16
71
39
59
41
73
TRICK-H
INSEL
D-PB-H
D-PB-H
PICTURE-SEL PICTURE-SEL
D-V SYNC
C-SYNC
SP/LP/SLP SP/LP/SLP
C-ROTA
D-V SYNC
C-ROTA
34
14
71
39
59
73
TRICK-H TRICK-H
INSEL/ST-SL
74
45 47 49 44
Q301
BUFFER
WF3
WF5
WF9
WF1
38
15
94
82
83
84
85
SP
EP
16
D-REC-H
REC/EE/PB
D-PB-L
11
D-REC-H
IC501 (OSD)
40
38
OSD
CHARACTER
MIX
DCV603

TU701
Audio Block Diagram
AUDIO-IN
REC
AMP
7
6
AUTO
BIAS
99
P-ON+5V
P-ON+5V
Q421
BIAS
OSC
Q422
Q426
(PB=ON)
Q425
SWITCHING
D-REC OFF
4
3
1
EQ
AMP
LINE
AMP MUTE 96
98
100
SP/LP-ON
P
R
ALC
REAR TUNER
FRONT
IC301
(AUDIO SIGNAL PROCESS) 76
2
AUDIO-OUT 14
SIF OUT 15
TP753
J26
A-OUT(R)
TP754
A-OUT(L)
4 A-PB/REC
CL504
3 A-COM
1 AE-H
2 AE-H/FE-H
AUDIO
HEAD
AUDIO
ERASE
HEAD
AC HEAD ASSEMBLY
FE HEAD
(DECK ASSEMBLY)
1AE-H/FE-H
2 FE-H-GND
CL501
1-8-5 1-8-6 HD230BLA
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
16
11 12
D-REC-H
D-REC-H
REC/EE/PB
A-MUTE-H
D-PB-L
FROM
SERVO/SYSTEM
CONTROL BLOCK
FULL
ERASE
HEAD
WF4
7880
2
SIF
A-IN (L)
A-IN (R)
A-IN (L)-F
A-IN (R)-F
A-OUT (R)
N-A-OUT
MOD-A
N-A-IN
JK751
JK752
JK754
JK755
A-OUT (R)
A-OUT (L)
A-IN (L)
A-IN (R)
A-IN (L)
A-IN (R)
FROM/TO
Hi-Fi AUDIO
BLOCK
FRONT
REAR
A-OUT (L)
WF8
J14 J13
J17
DCV603
DCV603
DCV603
DCV603
DCV203
DCV203
DCV203
DCV603
DCV603

57
48 47
13 14
69
71
6
7
9
R-CH
INSEL
L-CH
INSEL
NOR
SW
SERIAL
DATA
DECODER
OUTPUT
SELECT
VCO LPF
L-CH BPF
R-CH
PNR
PILOT
DET
CONT
STEREO
PLL
STEREO
FILTER
SAP
FILTER
SAP
DET
SIF
DEMOD
SAP
DEMOD L-R
DEMOD
ST/SAP
SW MATRIX
L-CH
PNR
LIM DEV
COMP
SW
NOISE
VCO LPF
LIM DEV
COMP
COMP
DC
SW
NOISE
dBX
DEC
ENV
DET
MODE
OUT
RIPPLE
FILTER
DO
DET
MATRIX
R-CH BPF
P
R
R
L
P
R
HOLD
PULSE
NOISE
DET
ALC
34 33
23
4
80
2
78
37
38
54
77
1
39
26
24
27
SIF
A-IN(R)
A-IN(L)
N-A-OUT
A-IN(R)-F
A-IN(L)-F
LIM
49
MUTE
A-OUT (L)
MOD-A
A-OUT (R)
N-A-IN
Hi-Fi-H-SW
A-MUTE-H
NORMAL-H
40 ST/SAP-MODE
TO AUDIO BLOCK
IIC-BUS SDA
IIC-BUS SCL
P-ON+9V
TO SERVO/SYSTEM
CONTROL BLOCK
Hi-Fi
AUDIO
(R) HEAD
Hi-Fi
AUDIO
(L) HEAD
CYLINDER
ASSEMBLY
MAIN CBA
Hi-Fi-A(R) 7
Hi-Fi-COM 8
Hi-Fi-A(L) 9
CL253
IC451 (MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP)
Hi-Fi Audio Block Diagram ( DCV603 )
HD441BLH1-8-7 1-8-8
REC-AUDIO SIGNALPB-AUDIO SIGNAL Mode : SP/REC
PILOT
CANCEL
FROM/TO
AUDIO BLOCK
FROM/TO
SERVO/ SYSTEM
CONTROL BLOCK
FROM/TO
SERVO/SYSTEM
CONTROL BLOCK
62 63