Scott VCX-602 Service Manual
SERVICE MANUAL
Sec. 1: Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA’s
I Exploded views
I Parts List
Sec. 2: Deck Mechanism Section
I Standard Maintenance
I Alignment for Mechanism
I Disassembly/Assembly of Mechanism
I Alignment Procedures of Mechanism
I Deck Exploded Views
I Deck Parts List
VIDEO CASSETTE RECORDER
VCX602
SECAMPAL
MAIN SECTION
VIDEO CASSETTE RECORDER
VCX602
Sec. 1: Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA’s
I Exploded Views
I Parts List
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
Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1
Electrical Adjustment Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1
Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1
Function Indicator Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-5
Schematic Diagrams / CBA’s and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1
IC Pin Function Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1
Lead Identifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1
Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1
SPECIFICATIONS
Description Unit Minimum Nominal Maximum Remark
1. Video
1-1. Video Output (PB) Vp-p 0.8 1.0 1.2 FL6A
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
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 -7 -4 SP Mode
(-20dB ref. 1kHz) at 6kHz dB -10 -4 SP Mode
SP Mode,
W/O Burst
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
Note: Nominal specs represent the design specs. All units should be able to approximate these – some will exceed
and some may drop s lightly bel ow these s pecs. Limi t specs repr esent the absolute w orst condi tion that s till migh t
be considered acceptable; In no case should a unit fail to meet limit specs.
1-1-1 HG240SP
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have special
safety-related cha racteristics which are often not ev ident 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
continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory,
our products are carefully inspected to confirm with
the recognized pro duct safety and electrical code s of
the countries in which t hey ar e to be sold. However, in
order to maintain suc h com pliance, it is eq ually 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 ra diation. Thes e must also be
replaced only with specified replacements.
Examples: RF converter s, RF cables, noise blocking 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 soldering.
F. Observe that the wires do not contact heat pro duc-
ing parts (heatsinks, oxid e metal fi lm r esist ors, fus ible resistors, etc.).
G. Check that replaced wires do not contact sharp
edges or pointed parts.
H. When a power cord has been repla ced, check tha t
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 co nne cto rs
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
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 i nsulation fro m 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 crimpi ng to o l to cr i mp the me tal sleeve at it s
center. Be sure to crimp full y to the complete c losure of the tool.
L. When connecting or disconnecting the internal
connectors, first, dis connect the AC plug from the
AC outlet.
1-2-1 U29P_F_SFP
Safety Check after Servicing
1
B
Z
2
Examine the area surrounding the repaired location for
damage or deterioration. Obs erve that screws, parts,
and wires have been returned to their original positions. Afterwards, do the following tests and confirm
the specified values to verify compliance with safety
standards.
1. Clearance Dist ance
When replacing primary circuit components, confirm
specified clear ance distance (d) a nd (d’) between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
T a ble 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d) (d’)
230 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
≥ 3mm(d)
≥ 6 mm(d’)
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 terminals, 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 a cross the terminals o f load
Z. See Fig. 2 and the following table.
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Fig.
Exposed Accessible Part
AC Voltmeter
(High Impedance)
One side of
Power Cord Plug Prongs
Fig.
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
2kΩ RES.
Connected in
230 V
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
parallel
50kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
1-2-2 U29P_F_SFP
One side of power cord plug
prongs (B) to:
RF or
Antenna terminals
A/V Input, Output
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indi-
cated as shown.
Top View
Out
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
Pin 1
c. The 1st pin of every ma le con nec tor is in dic ate d as
shown.
Input
In
Bottom View
5
10
Pb (Lead) Free Solder
When soldering, be sure to use the Pb free solder.
How to Remove / Install Fl at 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)
Pin 1
Instructions for Connectors
1. When you con nect or dis conne ct the FFC ( Flexi ble
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.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
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 en tire flat pack-IC, first apply
soldering iron to c ent er of the fl at pack- IC and he at
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. The Flat Pack -IC shape may differ by models. Us e
an appropriate hot-air flat pack-IC desoldering
machine, whose shape matches that of the Flat
Pack-IC.
2. Do not supply hot air to the chi p parts around the
flat pack-IC for over 6 seconds because damage to
the chip parts may occur. Put masking tape aroun d
the flat pack-IC to protect other parts from damage.
(Fig. S-1-2)
1-3-1 NOTE_1
3. The flat pack-IC on th e CBA i s a ffixed with g lue , so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Machine
Flat Pack-IC
Tweezers
Fig. S-1-2
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 pin s of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
Flat Pack-IC
Desoldering Braid
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing en tire flat pack-IC, first apply
soldering iron to c ent er of the fl at pack- IC and he at
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. W hen you use solder flux
which is applied t o all pins of the fl at 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 s older
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 en tire flat pack-IC, first apply
soldering iron to c ent er of the fl at pack- IC and he at
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 solder ing 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 m ay be dam age d
if force is applied.
Soldering Iron
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 sol der will
not adhere (iron wi re). When hea ting the pins , use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
Sharp
Pin
Fine Tip
Soldering Iron
Fig. S-1-4
Hot Air Blower
or
Iron Wire
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
1-3-2 NOTE_1
Instructions for Handling
Semi-conductors
CBA
Tweezers
Fine Tip
Soldering Iron
Flat Pack-IC
Fig. S-1-6
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 indica tes pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positio ning for installatio n. Then
presolder the four corne rs 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.
Electrostatic breakdown of the semi-conductors may
occur due to a poten tial difference caused by elec trostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a groun ding ban d (1M Ω) that is properly grounded to r emo ve any static electric it y t hat may
be charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper pla te
with proper grounding (1MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on clothing will not escape through the b ody grounding band,
be careful to avoid contacting semi-conductors with
your clothing.
<Incorrect>
CBA
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
Fig. S-1-7
<Correct>
1MΩ
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
CBA
Flat Pack-IC
Fig. S-1-8
1-3-3 NOTE_1
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 A ssembly. Make sure the power
is on, connect TP507 (S-INH) to GND. This will stop
the function of Tape Start Sensor, Tape End Sensor
and Reel Sensors. (If these TPs are connec ted befo re
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.
Q505
Q504
TP507
S-INH
Fig. 1
1-4-1 HG240PFS
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.
[1] Top Case
[2] Front Assembly
[3] VCR Chassis Unit
[4] Jack CBA
[5] Deck Assembly
[6] Main CBA
[7] Cylinder Shield
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
PART
REMOVE/*UNHOOK/
Fig.
UNLOCK/RELEASE/
No.
UNPLUG/DESOLDER
Note
(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), two Screws (S-3) and
Screw (S-4). Then, slowly lift the VCR Chassis Unit
(Deck Assembly, Jack CBA and Main CBA) up.
2. When reassembling, solder wire jumpers as shown
in Fig. D5.
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on M ain CBA as shown in
Fig. D6. Then, install the Deck Assembly while
aligning the hole of Cam Gear with the pin of LDSW, the shaft of Cam Gear with the hole of LD- SW
as shown in Fig. D6.
[1] Top Case D1 7(S-1) -
Front
[2]
Assembly
VCR
[3]
Chassis
Unit
[4] Jack CBA D4 Desolder, (S-5) -
Deck
[5]
Assembly
[6] Main CBA D5 ---------- -
Cylinder
[7]
Shield
↓
(1)
↓
(2)
D2 *3(L-1),*4(L-2) -
D3 5(S-2), 2(S-3), (S-4), 1
D5,
2(S-6), Desolder 2,3
D6
D5 (S-7) -
↓
(3)
↓
(4)
↓
(5)
1-5-1 HG240DC
(S-1)
[1] T op Case
(S-1)
(S-1)
Fig. D1
(S-2)
[3] VCR
Chassis Unit
(S-2)
(S-3)
(S-2)
(S-4)
(S-3)
(S-2)
(L-2)
[2] Front
Assembly
(L-1)
(L-2)
Fig. D3
[4] Jack CBA
(S-5)
Desolder
Fig. D2
Fig. D4
1-5-2 HG240DC
[7] Cylinder Shield
FE Head
Cylinder Assembly
(S-7)
Pin
[5] Deck
Assembly
From
FE Head
From
Cylinder
Assembly
(S-6)
TOP VIEW
From
ACE Head
Assembly
ACE Head
Assembly
[6] Main CBA
(S-6)
From
Capstan Motor
Assembly
Lead with
blue stripe
[6] Main CBA
[5] Deck Assembly
Shaft
Hole
LD-SW
SW507
LD-SW
Cam Gear
Hole
Pin
[6] Main CBA
Fig. D6
Printing
Lead with
white stripe
Lead connections of Deck Assembly and Main CBA
Lead with
blue stripe
Desolder
from bottom
side
Fig. D5
1-5-3 HG240DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
e
2
)
C
C
c
General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."
NOTE:
1.Electrical ad justments are r equired after repl acing
circuit components and certain mechanical parts.
It is important to do these adjustments only after
all repairs and replacements have been completed. Also, do not attempt these adjustments
unless the proper equipment is available.
2.To perform these alignment / confirmation procedures, make su re that th e trac king c ontrol is se t in
the center position: Pr ess either " L " or "K" button
on the remote control unit first, then the "PLAY"
button (Front Panel only).
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 (FL6A)
Head Switching Position Adjustment
Purpose:
To determine the Head Switching position during
playback.
Symptom of Misadjustment:
May cause Head Switching noise or ver tical jitter
in the picture.
Test point Adj.Point Mode Input
J23(V-OUT)
TP502(RF-SW)
GND
Tape
FL6A Oscilloscope
Connections of Measurement Equipment
Main CBA
VR501
(Switching Point)
(MAIN CBA)
Measurement
Equipment
J23
GND
TP502
PLAY
(SP)
6.5H±1H
(412.7µs±63.5µs)
Oscilloscop
-----
Spec.
CH1 CH
Trig. (+
Figure 1
EXT. Syncronize Trigger Point
H1
H2
Reference Notes:
Playback the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output waveform is at the 6.5H±1H(412.7µs±63.5µs) delayed position from the rising edge of the CH2 head switching
pulse waveform.
1.0H
6.5H+/-1H (412.7µs+/-63.5µs)
Switching Pulse
0.5H
V-Syn
1-6-1 HG240EA
BLOCK DIAGRAMS
Servo/System Control Block Diagram
TO
AUDIO BLOCK
FROM/TO
VIDEO BLOCK
TP507
SENS-INH
KEY
SWITCH
KEY
SWITCH
8
7
KEY- 2
KEY- 1
IC501
(SERVO/SYSTEM CONTROL)
AL+5V
D502
S-LED
CTL(+)
LD-SW
9
95
AL+5V
D561 STAND-BY
+5V
CTL(-)
94
ST-S
END-S
10480
D562 POWER
Q562
S-REEL
T-REEL
79
D563 CAS
23
POWER-LED
RESET
34
RESET
TIMER+5V
S-REEL
PS503
Q563
Q501
D564 TIMER
Q564
24
CAS-LED
D565 REC
Q565
25
TIMER-LED
CTL AMP OUT
97
CTL
TP501
SDA
SDA
TU701(TUNER UNIT)
3
12
26
REC-LED
SCL
5
SCL
11
AL+5V
VR501
SDA
IC503 (MEMORY)
5
REMOTE
SENSOR
RS501
14
REMOCON-IN
REC-
SAF-SW
PG-DELAY
2
31
AL+5V
SW-POINT
SCL
6
REC-
SW506
A-MUTE-H
IIC-BUS SCL
AUDIO-SW-1
AUDIO-SW-2
IIC-BUS SDA
29
30
AUDIO-SW-1
AUDIO-SW-2
SAFETY
P-ON+15V
AL+12V
CN502
P-ON+15V11AL+12V(2)10GND9D-PFG8D-CONT7LM-FWD/REV
12
RF-SW
D-REC-H
IIC-BUS SCL
IIC-BUS SDA
71
33
72
83
A-MUTE-H
D-REC-H
IIC-BUS SCL
IIC-BUS SDA
D-CONT
LM-
FWD/REV
D-PFG
90
C-CONT
77
76
81
GND5C-CONT4C-F/R3C-FG2P-ON+5V1AL+12V/+20.5V
6
C-ROTA
151318
RF-SW
C-ROTA
C-F/R
78
V-ENV
C-SYNC
D-V SYNC
6
V-ENV
D-V-SYNC
C-FG
87
AL+12V/+20.5V
P-ON+5V
TRICK-H
SECAM-H
58
65
C-SYNC
TRICK-H
C-POW-SW
FROM/TO
61
SECAM-H
P-ON-H
C-POW-SW
P-DOWN-L
67
66
86
P-ON-H
P-DOWN-L
POWER
SUPPLY
BLOCK
SW507
MAIN CBA
LD-SW
Q504
ST-S
SENSOR CBA
Q503
TP506
T-REEL
END-S
Q505
END-S
SENSOR CBA
CN504
2 CTL(+)
1 CTL(-)
CONTROL
HEAD
(DECK ASSEMBLY)
1-7-1
AC HEAD ASSEMBLY
CYLINDER ASSEMBLY CAPSTAN MOTOR
PG
M
CAPSTAN
MOTOR
SENSOR
M
DRUM
MOTOR
M
LOADING
MOTOR
HG223BLS
Video Block Diagram
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
IIC-BUS SDA
IIC-BUS SCL
FROM
SERVO/SYSTEM
CONTROL BLOCK
50
55
CYLINDER ASSEMBLY
(DECK ASSEMBLY)
123
V(R)
CN253
969593
7978
69684643
SERIAL
DECORDER
Y. DELAY
65
VIDEO (L)-1
HEAD
VIDEO (R)-1
HEAD
V(L)
V-COM
94
SP
HEAD
AMP
SP
EP
P
R
LUMINANCE
SIGNAL
PROCESS
AGC
BYPASS
WF1
TP502
EP
HEAD
AMP
REC FM
AGC
+
Y
CCD 1H DELAY
CHARA.
INS.
RF-SW
C
CHROMINANCE
1/2
FROM/TO SERVO/SYSTEM
CONTROL BLOCK
V-ENV
RF-SW
C-ROTA
D-REC-H
D-V-SYNC
84
62
70
80
V-ENV
D-REC-H
D-V-SYNC
C-ROTA/RF-SW
RPRP
SIGNAL
PROCESS
Y/C
FBC
C-SYNC
TRICK-H
67
C-SYNC
MIX
SECAM-H
PR
IC370 (PAL/SECAM DECTECTOR)
28
44
PB-H OUT
21
25
2928
AGC VXO
58 59
PAL/SECAM
DETECTOR
1
171418216
29
WF2
C-PB
TP301
X301
4.433619MHz
IC501 (OSD)
MAIN CBA
COLOR
-IN
OSD
CHARACTER
MIX
52
IC301
(Y/C SIGNAL PROCESS)
BUFFER
Q351
IN1
IN2
TUNER
485052
6
24
VIDEO IN
VIDEO OUT
TU701(TUNER UNIT)
1-7-2
IN2
MUTE
PB/EE
IN1
MUTE
TUNER
PB/EE
56
WF3
JACK CBA
J23
61
63
V-OUT
CN151
CN101
Q101
JK101
CN152
1
V-OUT1
V-IN1
33
1
CN102
20
V-IN1
Q102
JK102
BUFFER
19
V-OUT1
1
V-OUT2
V-IN2 3
3
1
BUFFER
19
20
V-OUT2
V-IN2
HG223BLV
Audio Block Diagram
Mode : SP/REC
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
MAIN CBA
PB/EE
IC151 (SWITCHING)
152
PB/EE
PB/EE
3
4
IN2
1214151110
PB/EE
TUNER
IN1
IN1
13
TO SERVO/SYSTEM
CONTROL BLOCK
AUDIO-SW-1
AUDIO-SW-2
9
SW
CTL
ALC
TO SERVO/SYSTEM
71
68 69
16
CONTROL BLOCK
A-MUTE-H
IIC-BUS SCL
IIC-BUS SDA
11
12
MUTE
SERIAL
DECODER
AUDIO HD-SW
CONTROL
DET
INV
LINE
R
ALC
AMP
ATT
REC-ON
P
REC
AMP
2
21
AUDIO
TU-AUDIO
TU701(TUNER UNIT)
CN151
5
7
A-IN1
A-OUT1
5
7
CN101
Q151
CN152
8
A-IN2
8
CN102
BUFFER
6
A-OUT2
6
Q152
BUFFER
TUNER
IC301 (AUDIO SIGNAL PROCESS)
IN1
IN2
151317
EQ
PB-ON
5
98
AMP
6
7
SP/LP-ON
+5V
Q401
CN504
BIAS
Q402
3 A-PB/REC
4 A-COM
6 AE-H
100
3
AUTO
1
OSC
5 AE-H/FE-H
BIAS
2
Q406
+5V
Q403
(SWITCHING)
CN501
2 FE-H
Q405
(PB=ON)
1 FE-H-GND
JACK CBA
JK101
261
A-IN1
A-IN1
3
A-OUT1
A-OUT1
JK102
261
A-IN2
A-IN2
3
A-OUT2
A-OUT2
1-7-3
ACE HEAD ASSEMBLY
AUDI O
HEAD
(DECK ASSEMBLY)
AUDI O
ERASE
HEAD
FE HEAD
FULL
ERASE
HG223BLA
HEAD
Power Supply Block Diagram
P-ON+44V
P-ON+15V12P-ON-H
AL+12V/+20.5V
AL+12V
AL+5V
TIMER+5V
C-POW-SW
P-ON+5V
P-DOWN-L
AL-5V
MAIN CBA
T001
Q051
Q054
Q055
Q059
Q057
Q052
131514
2
Q058
16
4
Q001
Q056
SHUNT
REGULATOR
Q004
11
17
18
1
4
IC001
ERROR
6
7
VOLTAGE DET
COLD
23
BRIDGE
RECTIFIER
D001 - D004
LINE
FILTER
F001 L003
T1.6A L 250V
HOT CIRCUIT. BE CAREFUL.
AC001
1-7-4
Q002
Q003
HOT
HG223BLP
FUNCTION INDICATOR SYMBOLS
Note:
The following symbol s wil l app ear o n th e i ndi cator panel to in di cat e th e c urr ent mod e o r ope ratio n o f the V CR.
On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons.
Display panel
STANDBY
FUNCTION
TAPE IN
TIMER
MODE INDICATOR ACTIVE
STANDBY Power on = " H "
Power off = " L "
FUNCTION VCR mode = " H "
TV mode = " L "
TAPE IN Cassette in = " H "
Cassette out = " L "
TIMER Timer stand by = " H "
One touch recording = " H "
Timer recording = " H "
General mode = " L "
REC REC mode = " H "
REC pause
General mode = " L "
REC
" H "= LED Light on, " L "= LED Light off
Blinks at 0.8Hz interval
When reel and capstan mechanism is not
functioning correctly
When tape loading mechanism is not functioning correctly
When cassette loading mechanism is not
functioning correctly
When the drum is not working properly
P-ON Power safety detection
“A R” is displayed on a TV screen. (Refer to Fig. 1.)
“A T” is displayed on a TV screen. (Refer to Fig. 2.)
“A C” is displayed on a TV screen. (Refer to Fig. 3.)
“A D” is displayed on a TV screen. (Refer to Fig. 4.)
“A P” is displayed on a TV screen. (Refer to Fig. 5.)
1-7-5 HG221FIS
TV screen
Note:
OSD for mechanical error will be displayed for 5 sec. after the mechanical error occurs.
When reel and capstan mechanism is not functioning
correctly
A
R
Fig. 1
When tape loading mechan ism is not functioni ng correctly
A
T
Fig. 2
When cassette lo ading mechanism is not functioning
correctly
When the drum is not working properly
A
D
P-ON Power safety detection
A
P
Fig. 4
Fig. 5
A
C
Fig. 3
1-7-6 HG221FIS
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS
(
Standard Notes
WARNING
Many electrical and mechanical parts in this chassis
have special characteristics. These characteristics
often pass unnoticed and the protection afforded by
them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage,
etc. Replacemen t parts that h ave thes e spec ial sa fety
characteristics are identified in this manual and its
supplements; electric al components having such features are identified by the mark " ! " in the schematic
diagram and the parts list. Before replacing any of
these components, read the parts list in this manual
carefully. The use of substitute replacement parts tha t
do not have th e same safe ty characteri stics as sp ecified in the parts list may create shock, fire, or other
hazards.
Capacitor Temperature Markings
Mark
Capacity
change rate
Standard
temperature
Temperature
range
Notes:
1. Do not use the part number shown on thes e drawings for or de ri n g. Th e co rr ect part number i s show n
in the parts list, and may be slightly different or
amended since these drawings were prepared.
2. All resistance values are indicated in ohms
3
(K=10
3. Resistor wattages are 1/4 W or 1/6W unless otherwise specified.
4. All capacitance values are indicated in µF
(P=10
5. All voltages are DC voltages unless otherwise
specified.
6. Electrical parts such as capacitors, connectors,
diodes, IC’s, transistors, resistors, switches, and
fuses are identified by fo ur digits. The fir st two digits are not shown for each component. In each
block of the diag ram , ther e is a not e suc h as sh own
below to indicate these abbreviated two digits.
, M=106).
-6
µF).
(B)
(F) +30 - 80% 20°C -25~+85°C
(SR)
(Z) +30 - 80% 20°C -10~+70°C
Capacitors and transistors are represented by the following symbols.
±10%
±15%
CBA Symbols
(Top View) (Bottom View)
Bottom View)
Transistor or Digital Transistor
E C B
(Top View)
E C B
NPN Transistor
20°C -25~+85°C
20°C -25~+85°C
Schematic Diagram Symbols
Digital Transistor
+
Electrolytic Capacitor
(Top View)
PNP Transistor
E C B
(Top View)
E C B
NPN Digital Transistor
(Top View)
PNP Digital
Transistor
E C B
1-8-1 SCPA1
LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING
1
".
".
3
2
1
PAGES:
1. CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE.
2. CAUTION:
Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F001) is blown, first check to see that all components in the power supply circuit are not defective
before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power
supply circuit to fail.
3. Note:
(1) Do not use the part number shown on the drawings for ordering. The correct part number is shown in the parts
list, and may be slightly different or amended since the drawings were prepared.
(2) To maintain original function and reliability of repaired units, use only original replaceme nt parts which are
listed with their part numbers in the parts list section of the service manual.
4. Mode: SP/REC
5. Voltage indications for PLAY and REC modes on the schematics are as shown below:
Unit: Volts
The same voltage for
both PLAY & REC modes
6. How to read converged lines
-D3
Distinction Area
Line Number
(1 to 3 digits)
Examples:
1. "1-D3" means that line number "1" goes to area "D3
2. "1-B1" means that line number "1" goes to area "B1
7. Test Point Information
: Indicates a test point with a jumper wire across a hole in the PCB.
: Used to indicate a test point with a component lead on foil side.
: Used to indicate a test point with no test pin.
5.0
231
5.0
PLAY mode
REC mode
(2.5)
Indicates that the voltage
is not consistent here.
AREA D3
1-B1
AREA B1
1-D3
ABCD
: Used to indicate a test point with a test pin.
1-8-2 SCRK05
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