Epson 27A-664 Service Manual
SERVICE MANUAL
Sec. 1: Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA’s
Sec. 2: Deck Mechanism Section
I Standard Maintenance
I Alignment for Mechanism
I Disassembly/Assembly of Mechanism
I Alignment Procedures of Mechanism
Sec. 3: Exploded views
and Parts List Section
I Exploded views
I Parts List
VIDEO CASSETTE RECORDER
27A-664
PAL
MAIN SECTION
VIDEO CASSETTE RECORDER
27A-664
Sec. 1: Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA’s
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-11
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
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
5. Hi-Fi Audio
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
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.
1-1-1 HE450SP
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evident 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 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 important 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 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 produc-
ing parts (heatsinks, oxide metal film resistors, fusible 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 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 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 closure of the tool.
L. When connecting or disconnecting the internal
connectors, first, disconnect the AC plug from the
AC outlet.
1-2-1 H8740SFP
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 positions. 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 soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 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 across the terminals of load
Z. See Fig. 2 and the following table.
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
AC Voltmeter
(High Impedance)
Fig. 1
Fig. 2
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
2kΩ RES.
Connected in
parallel
230 V
50kΩ RES.
Connected in
parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
1-2-2 H8740SFP
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
Input
Out
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
In
Pin 1
c. The 1st pin of every male connector is indicated as
shown.
Pin 1
Bottom View
5
10
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)
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)
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.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
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.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
Machine
Flat Pack-IC
Fig. S-1-2
1-3-1 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)
Flat Pack-IC
Desoldering Braid
(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.
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 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)
Sharp
Pin
Fine Tip
Soldering Iron
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
To Solid
Mounting Point
CBA
Tweezers
Hot Air Blower
or
Iron Wire
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Flat Pack-IC
Fig. S-1-6
1-3-2 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.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
Instructions for Handling
Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly 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 clothing will not escape through the body grounding band,
be careful to avoid contacting semi-conductors with
your clothing.
< Incorrect >
CBA
Presolder
Flat Pack-IC
Fig. S-1-8
CBA
< Correct >
Grounding Band
1MΩ
CBA
1MΩ
Conductive Sheet or
Copper Plate
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 Assembly. Make sure the power
is on, connect TP507 (SENSOR INHIBITION) to GND.
This will stop the function of Tape Start Sensor, Tape
End Sensor 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.
Q505
Q504
TP507
S-INH
Fig. 1
1-4-1 HE470PFS
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
[8] Jack Board
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
[1] Top Case 1 7(S-1) -
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), three 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. 5.
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. 6. 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. 6.
(S-1)
(S-1)
Front
[2]
Assembly
VCR
[3]
Chassis
Unit
[4] Jack CBA 4 Desolder, (S-5) -
Deck
[5]
Assembly
[6] Main CBA 5 *(L-3) -
Cylinder
[7]
Shield
Jack
[8]
Board
↓
(1)
↓
(2)
2 *3(L-1),*4(L-2) -
3 5(S-2), 3(S-3), (S-4), 1
5,6 2(S-6), Desolder 2,3
52(S-7) -
5 ---------- -
↓
(3)
↓
(4)
[1] Top Case
↓
(5)
1-5-1 HE450DC
(S-1)
Fig. 1
(L-2)
(S-5)
[4] Jack CBA
Desolder
[2] Front
Assembly
(S-2)
(S-3)
[3]VCR
Chassis
Unit
(L-1)
(S-2)
(S-3)
(L-2)
Fig. 4
Fig. 2
(S-2)
(S-4)
(S-3)
(S-2)
Fig. 3
1-5-2 HE450DC
[7] Cylinder Shield
FE Head
Cylinder Assembly
(S-7)
Pin
[8] Jack Board
(L-3)
From
FE Head
From
Cylinder
Assembly
(S-6)
TOP VIEW
From
AC Head
Assembly
AC Head
Assembly
[5] Deck 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. 6
Printing
Lead with
blue stripe
Lead connections of Deck Assembly and Main CBA
Lead with
blue stripe
Desolder
from bottom
side
Fig. 5
1-5-3 HE450DC
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 completed. Also, do not attempt these adjustments
unless the proper equipment is available.
2.To perform these alignment / confirmation procedures, make sure that the tracking control is set in
the center position: Press either "L5??" 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 point during
playback.
Symptom of Misadjustment:
May cause Head Switching noise or vertical 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±60µs)
Oscilloscope
-----
Spec.
CH1 CH2
Trig. (+)
Figure 1
EXT. Syncronize Trigger Point
CH1
CH2
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(412.7µs) delayed position from the
rising edge of the CH2 head switching pulse waveform.
1.0H
6.5H
Switching Pulse
0.5H
V-Sync
1-6-1 HE240EA
Servo/System Control Block Diagram
BLOCK DIAGRAMS
Q504
ST-S
SENSOR CBA
Q505
END-S
SENSOR CBA
(DECK ASSEMBLY)
AC HEAD ASSEMBLY
CONTROL
HEAD
CL287
5 5CTL(+)
6 6CTL(-)
CL504
MAIN CBA
END-S
SW507
LD-SW
Q503
T-REEL
AL+5V
PS503TP505
S-REEL
D502
S-LED
TIMER+5V
AL+5V
Q501
RESET
RS501
REMOTE
SENSOR
SW508
RESET
IC501
(SERVO/SYSTEM CONTROL)
REMOCON-IN
14
LD-SW9
95
CTL(+)
CTL(-)
94
10
ST-S
4
END-S
T-REEL
80
S-REEL79
RESET
34
KEY- 1
KEY- 2
DRV-DATA
DRV-STB
DRV-CLK
68
69
70
7
8
KEY
SWITCH
IC561
(FIP DRIVE)
DRV-DATA
28
DRV-STB
2
DRV-CLK
1
TP507
SENS-INH
KEY
SWITCH
S10
G1
G2
G3
G4
S1
S2
S7
S8
S9
23
22
21
20
13
14
16
17
FP562
LED CLOCK
7
8
TU701(TUNER UNIT)
SDA
3
SDA
12
SCL
5
SCL
11
IC503 (MEMORY)
SDA
5
SCL
6
CYLINDER ASSEMBLY CAPSTAN MOTOR
PG
DRUM
MOTOR
SENSOR
M
LOADING
MOTOR
M
CAPSTAN
MOTOR
M
VR501
SW-POINT
CL502
12 P-ON+15V
11
AL+12V(2)
10 GND
D-PG
9
D-CONT
8
LM-FWD/REV
7
GND
6
C-CONT
5
C-F/R
4
C-FG
3
P-ON+5V
2
AL+12V/+20.5V
1
AL+5V
FROM/TO
POWER
SUPPLY
BLOCK
AL+5V
SW506
REC-SAFETY
P-ON+15V
AL+12V
P-ON+5V
AL+12V/+20.5V
C-POW-SW
P-ON-H
P-DOWN-L
PG-DELAY
2
REC-SAF-SW
31
D-PG
90
D-CONT77
LM-FWD/REV
81
C-CONT
76
C-F/R
78
C-FG
87
C-POW-SW
66
P-ON-H
67
P-DOWN-L
86
A-MUTE-H
Hi-Fi-H-SW
A-MODE
LINE-MUTE
IIC-BUS SDA
IIC-BUS SCL
D-REC-H
RF-SW
C-ROTA
D-V SYNC
H-A-SW
H-A-COMP
V-ENV
C-SYNC
DAVN-L
83
19
32
28
72
71
33
18
15
13
16
17
58
20
IIC-BUS SDA
IIC-BUS SCL
A-MUTE-H
IIC-BUS SDA
IIC-BUS SCL
Hi-Fi-H-SW
A-MODE
LINE-MUTE
IIC-BUS SDA
IIC-BUS SCL
D-REC-H
RF-SW
C-ROTA
D-V SYNC
H-A-SW
H-A-COMP
6
V-ENV
C-SYNC
DAVN-L
TO
AUDIO BLOCK
FROM/TO
Hi-Fi AUDIO
BLOCK
FROM/TO
VIDEO BLOCK
1-7-1 1-7-2 HE451BLS
Video Block Diagram
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
V-OUT1
V-IN1
SERVO/SYSTEM
CONTROL BLOCK
JACK CBA
JK101
Q101
19
20
BUFFER
MAIN CBA
TU701
TU-VIDEO
JK756
V-IN-F
CL101
1
3 3
VIDEO
V-OUT1
V-IN1
V-IN1TO
TU-VIDEO
6
24
CL151
1
Q351
BUFFER
WF1
J23
V-OUT
IC501 (OSD)
OSD
52
CHARACTER
MIX
IC301
(Y/C SIGNAL PROCESS)
48
50
52
54
56
61
63
TUNER
PB/EE
TUNER
IN1
PB/EE
MUTE
IN1
IN2
FRT
IN2
FRT
MUTE
COLOR
-IN
FROM
SERVO/SYSTEM
CONTROL BLOCK
50
55
65
BYPASS
CHARA.
INS.
FBC
AGC VXO
AGC
PR
Y. DELAY
1/2
DAVN-L
IIC-BUS SDA
IIC-BUS SCL
LUMINANCE
SIGNAL
PROCESS
CCD 1H DELAY
CHROMINANCE
SIGNAL
PROCESS
Y/C
MIX
69684643
SERIAL
DECORDER
7978
R
Y
+
C
R P R P
P
REC FM
AGC
IC640 (VPS)
DAVN-L
14
6
IIC-BUS SDA
7
IIC-BUS SCL
VPS-V
16
SP
SP
HEAD
AMP
EP
EP
HEAD
AMP
D-REC-H
C-ROTA/RF-SW
D-V-SYNC
H-A-SW
H-A-COMP
V-ENV
C-SYNC
96
95
93
94
90
89
88
87
80
70
62
71
83
84
67
V-COM
V-COM
WF1
TP502
RF-SW
CL253
V(R)-1
V(L)-1
V(L)-2
V(R)-2
D-REC-H
RF-SW
C-ROTA
D-V-SYNC
H-A-SW
H-A-COMP
V-ENV
C-SYNC
(DECK ASSEMBLY)
CYLINDER ASSEMBLY
1
2
3
4
5
6
FROM/TO SERVO/SYSTEM
CONTROL BLOCK
VIDEO (R)-1
HEAD
VIDEO (L)-1
HEAD
VIDEO (L)-2
HEAD
VIDEO (R)-2
HEAD
V-OUT2
V-IN2
19
20
JK102
Q102
BUFFER
CL102
1
V-OUT2
V-IN2 3
3
CL152
1
58 59
2928
X301
4.433619MHz
21
TP301
C-PB
WF2
1-7-3 1-7-4 HE451BLV
Audio Block Diagram
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
MAIN CBA
TO Hi-Fi
AUDIO BLOCK
(DECK ASSEMBLY)
ACE HEAD ASSEMBLY
AUDIO
HEAD
AUDIO
ERASE
HEAD
N-A-PB
N-A-REC
CL287
A-PB/REC 4
A-COM 3
AE-H 1
AE-H/FE-H 2
CL504
4 A-PB/REC
3 A-COM
1 AE-H
2 AE-H/FE-H
Q401
Q402
BIAS
OSC
+5V
Q406
IC301
(AUDIO SIGNAL PROCESS) 1513 17
TUNER IN2
INV
R
98
ATT
P
REC
AMP
5
6
1
2
PB-ON
EQ
AMP
SP/LP-ON
AUTO
BIAS
7
3
100
IN1
ALC
DET
ALC
LINE
AMP
REC-ON
MUTE
12
11
FULL
ERASE
HEAD
FE HEAD
SERIAL
DECODER
68 69
71
A-MUTE-H
IIC-BUS SDA
IIC-BUS SCL
TO SERVO/SYSTEM
CONTROL BLOCK
CL501
2 FE-H
1 FE-H-GND
Q405
(PB=ON)
Q403
SWITCHING
D-REC-OFF
+5V
AUDIO HD-SW
CONTROL
16
1-7-5 1-7-6 HE451BLA
Hi-Fi Audio Block Diagram
REC-AUDIO SIGNALPB-AUDIO SIGNAL Mode : SP/REC
A-IN1(R)
A-IN1(L)
A-OUT1(R)
A-OUT1(L)
A-IN2(R)
A-IN2(L)
A-OUT2(R)
A-OUT2(L)
JACK CBA
JK101
2
6
1
3
JK102
2
6
1
3
CL101
CL102
10
A-IN1(R)
A-IN1(L) 8
8
6
A-OUT1(R)
A-OUT1(L) 12
12
9
A-IN2(R)
A-IN2(L) 8
8
6
A-OUT2(R)
A-OUT2(L) 11
11
10
6
9
6
CL151
CL152
67
65
(Hi-Fi AUDIO SIGNAL PROCESS)
IC451
SW
SW
ALC
ALC
ALC
MAIN CBA
CN701 CN1
4
TU-AUDIO(R)
TU-AUDIO(L)
5
4
5
AFV CBA
IF SIGNAL
PROCESS
OUTPUT
SELECT
CN1
SIF
CN701
2
MUTE-ON
VCO MUTE
MUTE-ON
73
74
72
76
77
75
CL509
2
A-OUT1(L)
1
A-OUT1(R)
JK751
SUB JACK CBA
TU701
22
SIF
2
AUDIO
A-OUT
(L)
A-OUT
(R)
JK758
A-IN(R)-F
JK757
A-IN(L)-F
TO AUDIO BLOCK
N-A-REC
N-A-PB
52
56
54
50
60
10
78
80
62
70
61 71
47
R-CH
INSEL
2
6
L-CH
8
4
INSEL
+
48
14
15
ALC
R-CH
PNR
L-CH
PNR
P
R
R
P
SW
NOISE
LIM DEV
LIM DEV
SW
NOISE
DO
DET
R-CH
BPF
NOISE
DET
HOLD
PULSE
L-CH
BPF
COMP
VCO
LPF
MIX V/I
LPF
VCO
COMP
LIM
ENV
DET
34 33
LOGIC
LINE-MUTE
R
L
37
38
Q451
21
53
39
24
26
27
IIC-BUS SDA
IIC-BUS SCL
A-MODE
LINE-MUTE
Hi-Fi-H-SW
CL253
Hi-Fi-A(R) 9
Hi-Fi-COM 8
Hi-Fi-A(L) 7
FROM/TO SYSTEM
CONTROL BLOCK
CYLINDER
ASSEMBLY
Hi-Fi
AUDIO
(R) HEAD
Hi-Fi
AUDIO
(L) HEAD
1-7-7 1-7-8
HE451BLH
Power Supply Block Diagram
AC001
NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
HOT CIRCUIT. BE CAREFUL.
F001
T1.6A L 250V
L003
LINE
FILTER
D001 - D004
BRIDGE
RECTIFIER
CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE T1.6AL/250V FUSE.
T001
Q051
2
4
Q001
12
Q052
13
Q057
14
Q058
15
CAUTION !
Fixed voltage (or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F001) is blown, 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.
MAIN CBA
P-ON+15V
P-ON+32V
P-ON-H
Q053
Q055
Q054
AL+12V/+20.5V
AL+9V
AL+12V
C-POW-SW
AL+5V
TIMER+5V
P-ON+5V
P-DOWN-L
P-OFF-H
HOT
Q003
Q002
7
6
IC001
ERROR
VOLTAGE DET
4
Q004
(SHUNT REGULATOR)
1
23
REG
16
11
17
18
Q059
Q056
COLD
HE451BLP1-7-9 1-7-10
FUNCTION INDICATOR SYMBOLS
Note:
The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR.
On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons.
Display panel
" H "= LED Light on, " L "= LED Light off
LED MODE INDICATOR ACTIVE
CASSETTE "IN"
CASSETTE "OUT"
CLOCK " 88:88 ON
POWER ON " PWR." ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T- R E C , O T R
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
" "
" "
" "
" "
" 1 "
" "
" 2 "
" "
" 3 "
" "
" 4 "
" "
" 5 "
ON
OFF
ON
(T-REC OFF,T-REC incomplete
Blinks at 0.8Hz interval)
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
Blinks at 0.8Hz interval
S-INH condition All modes Blinks at 0.8Hz interval
1-7-11 HE450FIS
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. Replacement parts that have these special safety
characteristics are identified in this manual and its
supplements; electrical 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 that
do not have the same safety characteristics as specified 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 these drawings for ordering. The correct part number is shown
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 1/4W 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 four digits. The first two digits are not shown for each component. In each
block of the diagram, there is a note such as shown
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%
20°C -25~+85°C
20°C -25~+85°C
CBA Symbols
(Top View) (Bottom View)
+
Electrolytic Capacitor
(Bottom View)
Transistor or Digital Transistor
E C B
(Top View)
(Top View)
Schematic Diagram Symbols
Digital Transistor
E C B
(Top View)
E C B
NPN Transistor
NPN Digital Transistor
PNP Transistor
E C B
(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
PAG ES :
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 replacement parts which are
listed with their part numbers in the parts list section of the service manual.
4. Wire Connectors
(1) Prefix symbol "CN" means "connector" (can disconnect and reconnect).
(2) Prefix symbol "CL" means "wire-solder holes of the PCB" (wire is soldered directly).
5. Mode: SP/REC
6. Voltage indications for PLAY and REC modes on the schematics are as shown below:
Unit: Volts
The same voltage for
both PLAY & REC modes
7. How to read converged lines
1-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".
8. 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.
5.0
231
5.0
PLAY mode
REC mode
(2.5)
Indicates that the voltage
is not consistent here.
3
AREA D3
2
1
AREA B1
1-D3
ABCD
1-B1
: Used to indicate a test point with no test pin.
: Used to indicate a test point with a test pin.
1-8-2 SCRK05
Main 1/7 Schematic Diagram
1-8-3
1-8-4
HE451SCM1
Main 2/7 & Sensor Schematic Diagram
1-8-5
1-8-6
HE451SCM2
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