AEG VCR-4500, VCR-4505 Service manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
VCR 4500
VCR 4505
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
PAL
MAIN SECTION
VIDEO CASSETTE RECORDER
VCR 4500/VCR 4505
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-7
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
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
1-1-1 HG462SP
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 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
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 -7 -4 SP Mode
(-20dB ref. 1kHz) at 6kHz dB -10 -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 [ VCR 4500 ]
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 U29PSFP
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.
1-2-2 U29PSFP
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
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 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.
AC Line Voltage Clearance Distance (d), (d’)
230 - 240 V
≥ 3mm(d)
≥ 6 mm(d’)
Chassis or Secondary Conductor
dd'
Primary Circuit Terminals
Fig. 1
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
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)
One side of power cord plug
prongs (B) to:
230 - 240 V
2kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
RF or
Antenna terminals
50kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
A/V Input, Output
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.
Pb (Lead) Free Solder
When soldering, be sure to use the Pb free solder.
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. The Flat Pack-IC shape may differ by models. Use
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 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)
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
1-3-2 NOTE_1
3. 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.
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.
Fig. S-1-2
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Fig. S-1-3
Flat Pack-IC
Desoldering Braid
Soldering Iron
Fig. S-1-4
Fine Tip
Soldering Iron
Sharp
Pin
Fig. S-1-5
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
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 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.
Fig. S-1-6
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers
Fig. S-1-7
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-8
Presolder
CBA
Flat Pack-IC
<Incorrect>
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
<Correct>
CBA
1-4-1 HG240PFS
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 (S-INH) 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.
Fig. 1
TP507
S-INH
Q504
Q505
1-5-1 HG462DC
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), 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 Main 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.
ID/
LOC
.No.
PA RT
REMOVAL
Fig.
No.
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Note
[1] Top Case D1 7(S-1) -
[2]
Front
Assembly
D2 *3(L-1),*4(L-2) -
[3]
VCR Chassis
Unit
D3-1
D3-2
5(S-2), (S-4)
2(S-3) --- [ VCR 4505 ],
3(S-3) --- [ VCR 4500 ]
1
[4] Jack CBA D4 Desolder, (S-5) -
[5]
Deck
Assembly
D5
D6
2(S-6), Desolder 2,3
[6] Main CBA D5 *(L-3) --- [ VCR 4500 ] -
[7]
Cylinder
Shield
D5 (S-7) -
[8]
Jack Board
[ VCR 4500 ]
D5 ---------- -
↓
(1)
↓
(2)
↓
(3)
↓
(4)
↓
(5)
[5] Deck Assembly
[4] Jack CBA
[1] Top Case
[2] Front Assembly
[3] VCR Chassis Unit
[6] Main CBA
[7] Cylinder Shield
[8] Jack Board [ VCR 4500 ]
Fig. D1
(S-1)
(S-1)
(S-1)
[1] Top Case
1-5-2 HG462DC
Fig. D2
(L-2)
(L-1)
[2] Front
Assembly
(L-2)
(S-2)
(S-2)
(S-4)
(S-2)
(S-2)
(S-3)
(S-3)
[3] VCR
Chassis
Unit
Fig. D3-1
[ VCR 4505 ]
Fig. D3-2
(S-2)
(S-2)
(S-4)
(S-2)
(S-2)
(S-3)
(S-3)
(S-3)
[3]VCR
Chassis
Unit
[ VCR 4500 ]
Fig. D4
(S-5)
[4] Jack CBA
Desolder
1-5-3 HG462DC
(S-7)
[5] Deck
Assembly
FE Head
Cylinder Assembly
ACE Head
Assembly
[7] Cylinder Shield
[6] Main CBA
(S-6)
(S-6)
From
FE Head
From
Cylinder
Assembly
From
ACE Head
Assembly
Lead with
white stripe
Lead with
blue stripe
Desolder
from bottom
Lead with
blue stripe
From
Capstan Motor
Assembly
Lead connections of Deck Assembly and Main CBA
Printing
side
TOP VIEW
Fig. D5
[8] Jack Board
(L-3)
[ VCR 4500 ]
Fig. D6
[6] Main CBA
SW507
LD-SW
LD-SW
Pin
Hole
Hole
Shaft
Cam Gear
[6] Main CBA
[5] Deck Assembly
Pin
1-6-1 HG240EA
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 position 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 waveform is at the 6.5H±1H(412.7µs±63.5µs) delayed position from the rising edge of the CH2 head switching
pulse waveform.
Test point Adj.Point Mode Input
J23(V-OUT)
TP502(RF-SW)
GND
VR501
(Switching Point)
(MAIN CBA)
PLAY
(SP)
-----
Tape
Measurement
Equipment
Spec.
FL6A Oscilloscope
6.5H±1H
(412.7µs±63.5µs)
Connections of Measurement Equipment
Figure 1
Oscilloscope
Main CBA
J23
CH1 CH2
Trig. (+)
GND
TP502
EXT. Syncronize Trigger Point
1.0H
CH1
CH2
Switching Pulse
6.5H+/-1H (412.7µs+/-63.5µs)
V-Syn c
0.5H
BLOCK DIAGRAMS
Servo/System Control Block Diagram
HG462BLS
1-7-1
CN504
CTL AMP OUT
97
SENSOR CBA
SENSOR CBA
END-S
ST-S
Q504
Q505
CONTROL
HEAD
AC HEAD ASSEMBLY
(DECK ASSEMBLY)
TP501
CTL
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
M
M
LOADING
MOTOR
CYLINDER ASSEMBLY CAPSTAN MOTOR
DRUM
MOTOR
PG
SENSOR
MAIN CBA
KEY- 2
C-CONT
C-FG
D-PFG
ST-S
T-REEL
C-F/R
KEY- 1
REMOCON-IN
CTL(+)
RESET
REC-SAF-SW
PG-DELAY
CTL(-)
D-V-SYNC
D-REC-H
RF-SW
H-A-SW
C-ROTA
END-S
14
90
87
94
957610480
34
78
2
131518
33
16
31
8
7
RS501
REMOTE
SENSOR
LM-FWD/REV
81
D-CONT
77
T-REEL
Q501
RESET
Q503
S-REEL
79
SW-POINT
AL+5V
VR501
TIMER+5V
S-REEL
PS503
TP506
IIC-BUS SDA
IIC-BUS SDA
IIC-BUS SCL
A-MUTE-H
IIC-BUS SDA
IIC-BUS SCL
Hi-Fi-H-SW
A-MODE
A-MUTE-H
Hi-Fi-H-SW
A-MODE
H-A-COMP
17
V-ENV
6
P-ON-H
C-POW-SW
P-ON-H
C-POW-SW
P-DOWN-L
67
66
86
P-DOWN-L
C-SYNC
58
SW506
FROM/TO
VIDEO BLOCK
FROM/TO
Hi-Fi AUDIO
BLOCK
TO
AUDIO BLOCK
SDA
SDA
SCL
SCL
TU701(TUNER UNIT)
IC503 (MEMORY)
72
32
19
83
IIC-BUS SCL
D-V-SYNC
D-REC-H
RF-SW
H-A-SW
C-ROTA
IIC-BUS SDA
H-A-COMP
V-ENV
C-SYNC
IIC-BUS SCL
71
3
5
SDA
SCL
12
11
LD-SW
9
AL+12V/+20.5V
P-ON+15V
AL+5V
AL+5V
SW507
AL+12V
P-ON+5V
LD-SW
AL+5V
D502
S-LED
FROM/TO
POWER
SUPPLY
BLOCK
LINE-MUTE
KEY
SWITCH
KEY
SWITCH
TP507
SENS-INH
CAPSTAN
MOTOR
IC561B(LED DISPLAY)
IC501
(SERVO/SYSTEM CONTROL)
DRV-DATA
DRV-STB
DRV-CLK
DRV-DATA
DRV-STB
DRV-CLK
FP562
LED DISPLAY
D1D2D3
D4
a
f
j
bcd
232221
28
2
1
686970
2011161413e12
17
7
AUDIO-SW-2
AUDIO-SW-2
30
AUDIO-SW-1
AUDIO-SW-1
29
LINE-MUTE
28
5
6
CN502
12
P-ON+15V11AL+12V(2)10GND9D-PFG8D-CONT7LM-FWD/REV
6
GND5C-CONT4C-F/R3C-FG2P-ON+5V1AL+12V/+20.5V
REC-SAFETY
END-S
M
Q562
Q563
Q564
Q565
CAS-LED
TIMER-LED
REC-LED
POWER-LED
+5V
A
A
B
A
262524
23
2 CTL(+)
1 CTL(-)
D565 REC
D564 TIMER
D563
CAS
D562 POWER
D561 STAND-BY
Video Block Diagram
HG462BLV
1-7-2
SP
HEAD
AMP
REC FM
AGC
FROM/TO SERVO/SYSTEM
CONTROL BLOCK
FROM
SERVO/SYSTEM
CONTROL BLOCK
RF-SW
D-REC-H
C-ROTA
D-V-SYNC
V-ENV
LUMINANCE
SIGNAL
PROCESS
CHROMINANCE
SIGNAL
PROCESS
V-ENV
D-V-SYNC
C-ROTA/RF-SW
TU701(TUNER UNIT)
IC301
(Y/C SIGNAL PROCESS)
IC501 (OSD)
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
SERIAL
DECORDER
V-O UT1
1
V-IN1
1
33
V-O UT2
1
V-IN2 3
1
3
JACK CBA
485052
56
24
6
50
52
19
20
JK101
V-OUT1
V-IN1
19
20
JK102
CN151
CN152
CN101
CN102
V-OUT2
V-IN2
61
63
CHARA.
INS.
CCD 1H DELAY
SP
BYPASS
MUTE
PB/EE
IN1
TUNER
IN1
TUNER
MUTE
PB/EE
IN2
IN2
AGC
PR
R
Y
C
P
RPRP
Y. DELAY
Y/C
MIX
+
21
7978
AGC VXO
OSD
CHARACTER
MIX
FBC
1/2
58 59
65
2928
IIC-BUS SDA
IIC-BUS SCL
69684643
84
62
70
D-REC-H
80
BUFFER
Q101
BUFFER
Q102
J23
V-OUT
WF1
TP301
X301
4.433619MHz
C-PB
WF3
VIDEO-OUT
VIDEO-IN
BUFFER
Q351
MAIN CBA
TP502
RF-SW
WF2
C-SYNC
C-SYNC
67
25
V(R)-1
V-COM
V(L)-2
CN253
123
969593
94
54
FRT
FRT
JK756
V-IN
FRONT
A
H-A-SW
71
H-A-COMP
83
H-A-SW
H-A-COMP
A
CYLINDER ASSEMBLY
(DECK ASSEMBLY)
VIDEO (R)-1
HEAD
EP
HEAD
AMP
VIDEO (L)-1
HEAD
VIDEO (L)-2
HEAD
VIDEO (R)-2
HEAD
V(L)-2
V-COM
V(R)-2
456
908988
87
EP
A
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
Audio Block Diagram ( A )
HG462BLA1-7-3
REC
AMP
100
3
AUTO
BIAS
2
1
+5V
+5V
Q401
Q406
BIAS
OSC
Q402
N-A-PB
TO Hi-Fi
AUDIO BLOCK
N-A-REC
Q405
(PB=ON)
Q403
5
EQ
AMP
98
7
LINE
AMP
REC-ON
AUDIO HD-SW
CONTROL
MUTE
11
6
PB-ON
SP/LP-ON
P
TUNER IN2
IN1
R
ALC
DET
ALC
IC301
(AUDIO SIGNAL PROCESS)
1513 17
3 A-PB/REC
CN504
4 A-COM
6 AE-H
5 AE-H/FE-H
AUDI O
HEAD
AUDI O
ERASE
HEAD
ACE HEAD ASSEMBLY
FE HEAD
2 FE-H
1 FE-H-GND
CN501
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
71
A-MUTE-H
IIC-BUS SCL
IIC-BUS SDA
TO SERVO/SYSTEM
CONTROL BLOCK
FULL
ERASE
HEAD
68 69
SERIAL
DECODER
(DECK ASSEMBLY)
12
16
INV
ATT
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
Audio Block Diagram ( B )
HG210BLA
1-7-4
REC
AMP
100
3
AUTO
BIAS
2
1
+5V
TU701(TUNER UNIT)
+5V
Q401
Q406
(SWITCHING)
BIAS
OSC
Q402
Q405
(PB=ON)
Q403
5
EQ
AMP
98
7
LINE
AMP
REC-ON
AUDIO HD-SW
CONTROL
MUTE
11
6
PB-ON
SP/LP-ON
P
TUNER
IN2
IN1
R
ALC
DET
SW
CTL
ALC
IC301 (AUDIO SIGNAL PROCESS)
IC151 (SWITCHING)
PB/EE
PB/EE
PB/EE
PB/EE
TUNER
TU-AUDIO
AUDIO
IN2
IN1
IN1
151317
3 A-PB/REC
CN504
4 A-COM
6 AE-H
5 AE-H/FE-H
A-PB/REC 3
A-COM 4
AE-H 6
AE-H/FE-H 5
CN287
AUDI O
HEAD
AUDI O
ERASE
HEAD
ACE HEAD ASSEMBLY
FE HEAD
2 FE-H
1 FE-H-GND
CN501
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
Mode : SP/REC
71
A-MUTE-H
AUDIO-SW-1
AUDIO-SW-2
IIC-BUS SCL
IIC-BUS SDA
TO SERVO/SYSTEM
CONTROL BLOCK
TO SERVO/SYSTEM
CONTROL BLOCK
FULL
ERASE
HEAD
68 69
SERIAL
DECODER
(DECK ASSEMBLY)
12
16
INV
ATT
A-IN1(L)
A-OUT1(R)
7
5
JACK CBA
JK101
CN101
A-IN2(L)
A-OUT2(R)
8
6
7
5
8
6
JK102
CN102
CN151
CN152
2
21
152
4
1214151110
9
3
13
BUFFER
Q151
BUFFER
Q152
A-IN1
A-IN1
261
3
A-OUT1
A-OUT1
A-IN2
A-IN2
261
3
A-OUT2
A-OUT2
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
Hi-Fi Audio Block Diagram ( A )
HG462BLH
1-7-5
ENV
DET
LOGIC
R
L
HOLD
PULSE
LIM
OUTPUT
SELECT
REC-AUDIO SIGNALPB-AUDIO SIGNAL Mode : SP/REC
IIC-BUS SDA
IIC-BUS SCL
A-MODE
LINE-MUTE
MUTE
MUTE-ON
MUTE-ON
Hi-Fi-H-SW
IF SIGNAL
PROCESS
JK758
A-IN(R)
N-A-REC
TO AUDIO BLOCK
N-A-PB
JK757
A-IN(L)
AFV CBA
TU-AUDIO(R)
4
TU-AUDIO(L)
5
4
5
CN701 CN 1
SIF
2
2
CN701
CN1
TU701
AUDIO IN
SIF OUT
2
22
JACK CBA
MAIN CBA
JK101
A-IN1(R)
A-IN1(L)
2
6
2
6
1
3
1
3
JK102
CN151
CN152
CN101
CN102
A-IN2(R)
A-IN2(L)
A-OUT1(R)
A-OUT1(L)
A-OUT2(R)
A-OUT2(L)
A-IN2(R)
(Hi-Fi AUDIO SIGNAL PROCESS)
9
A-IN2(L) 8
9
8
A-OUT2(R)
6
A-OUT2(L) 11
6
11
A-IN1(R)
9
A-IN1(L) 7
9
7
A-OUT1(R)
5
A-OUT1(L) 11
5
11
IC451
Hi-Fi
AUDIO
(R) HEAD
Hi-Fi
AUDIO
(L) HEAD
CYLINDER
ASSEMBLY
Hi-Fi-
A(R) 7
Hi-Fi
-COM 8
Hi-Fi-
A(L) 9
CN253
48
47
14
15
R-CH
INSEL
L-CH
INSEL
ALC
SW
SW
ALC
62
61 71
70
242627
34 33
L-CH
BPF
COMP
SW
NOISE
COMP
SW
NOISE
R-CH
BPF
VCO
LPF
LIM DEV
VCO
LPF
LIM DEV
MIX V/I
NOISE
DET
DO
DET
PPR
R
VCO MUTE
7374727677
75
37
38
21
53
39
L-CH
PNR
ALC
R-CH
PNR
ALC
67
65
5256545060
2
6108
4
78
80
+
Q451
FROM/TO
SERVO/SYSTEM
CONTROL BLOCK
(DECK ASSEMBLY)
FRONT
JK751
A-OUT
(L)
A-OUT
(R)
SUB JACK CBA
CN509
A-OUT1(L)2A-OUT1(R)
1
(TUNER UNIT)
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
Power Supply Block Diagram
HG462BLP
1-7-6
2
4
16
6
7
CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE T1.6AL/250V FUSE.
NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
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.
COLD
MAIN CBA
HOT CIRCUIT. BE CAREFUL.
HOT
IC001
ERROR
VOLTAGE DET
B
B
A
Q002
Q003
Q001
F001 L003
LINE
FILTER
BRIDGE
RECTIFIER
D001 - D004
1
23
4
Q004
AC001
T001
P-ON+44V
P-ON+15V12P-ON-H
AL+12V/+20.5V
AL+9V
AL+12V
C-POW-SW
AL+5V
TIMER+5V
P-ON+5V
P-DOWN-L
AL-5V
Q051
Q053
Q054
Q056
Q052
Q057
Q058
131514
11
17
18
T1.6A L 250V
Q055
Q059
SHUNT
REGULATOR
Comparison Chart of
Models & Marks
Model Mark
VCR 4500
VCR 4505
A
B
1-7-7 HG462FIS
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
[ VCR 4500 ]
MODE INDICATOR ACTIVE
POWER ON " PWR." ON
CASSETTE "IN"
CASSETTE "OUT"
" "
" "
ON
OFF
CLOCK " 88:88 " ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T- R E C , O T R
" "
ON
(T-REC OFF,T-REC incomplete
Blinks at 0.8Hz interval)
RF OUT RF out channel number is displayed on the indicator panel.
S-INH condition All modes Blinks at 0.8Hz interval
All lighting mode All characters ON
When reel and capstan mechanism is not
functioning correctly
“A R” is displayed on a TV screen. (Refer to Fig. 1.)
When tape loading mechanism is not functioning correctly
“A T” is displayed on a TV screen. (Refer to Fig. 2.)
When cassette loading mechanism is not
functioning correctly
“A C” is displayed on a TV screen. (Refer to Fig. 3.)
When the drum is not working properly
“A D” is displayed on a TV screen. (Refer to Fig. 4.)
P-ON Power safety detection
“A P” is displayed on a TV screen. (Refer to Fig. 5.)
1-7-8 HG462FIS
[ VCR 4505 ]
" H "= LED Light on, " L "= LED Light off
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 "
Blinks at 0.8Hz interval
When reel and capstan mechanism is not
functioning correctly
“A R” is displayed on a TV screen. (Refer to Fig. 1.)
When tape loading mechanism is not functioning correctly
“A T” is displayed on a TV screen. (Refer to Fig. 2.)
When cassette loading mechanism is not
functioning correctly
“A C” is displayed on a TV screen. (Refer to Fig. 3.)
When the drum is not working properly
“A D” is displayed on a TV screen. (Refer to Fig. 4.)
P-ON Power safety detection
“A P” is displayed on a TV screen. (Refer to Fig. 5.)
TAPE IN
T
IM
E
R
FUNCTION
STANDBY
REC
1-7-9 HG462FIS
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
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
Fig. 1
A
T
Fig. 2
A
C
Fig. 3
Fig. 4
A
D
A
P
Fig. 5
1-8-1 SCPA1
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
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
(K=10
3
, M=106).
3. Resistor wattages are 1/4W or 1/6W unless otherwise specified.
4. All capacitance values are indicated in µF
(P=10
-6
µF).
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.
Capacitors and transistors are represented by the following symbols.
Mark
Capacity
change rate
Standard
temperature
Temperature
range
(B)
±10%
20°C -25~+85°C
(F) +30 - 80% 20°C -25~+85°C
(SR)
±15%
20°C -25~+85°C
(Z) +30 - 80% 20°C -10~+70°C
(Top View) (Bottom View)
(Bottom View)
Electrolytic Capacitor
+
Transistor or Digital Transistor
NPN Transistor
PNP Transistor
NPN Digital Transistor
PNP Digital
Transistor
(Top View)
(Top View)
E C B
E C B
Digital Transistor
CBA Symbols
Schematic Diagram Symbols
E C B
(Top View)
(Top View)
E C B
E C B
1-8-2 SCRK05
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. Mode: SP/REC
5. Voltage indications for PLAY and REC modes on the schematics are as shown below:
6. How to read converged lines
7. Test Point Information
231
5.0
(2.5)
PLAY mode
REC mode
5.0
The same voltage for
both PLAY & REC modes
Unit: Volts
Indicates that the voltage
is not consistent here.
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".
3
2
1
ABCD
1-B1
1-D3
AREA D3
AREA B1
: 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.
: Used to indicate a test point with a test pin.
Loading...