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SERVICE MANUAL
Sec. 1: Main Section Sec. 2: Deck Mechanism Section
I Specifications I Standard Maintenance
I Preparation for Servicing I Alignment for Mechanism
I Adjustment Procedures I Disassembly/Assembly of Mechanism
I Schematic Diagrams I Alignment Procedures of Mechanism
I CBA's I Deck Exploded Views
I Exploded views I Deck Parts List
I Parts List
VIDEO CASSETTE RECORDER
29D-851
PAL
MAIN SECTION
VIDEO CASSETTE RECORDER
29D-851
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-6
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
SP Mode,
1-3. Video S/N Y (R/P) dB 40 45
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
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 HG450SP
IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice J. Be careful that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
Some electrical and mechanical parts have special
K. Crimp type wire connector
safety-related characteristics which are often not evi-
The power transformer uses crimp type connectors
dent from visual inspection, nor can the protection they
which connect the power cord and the primary side
give necessarily be obtained by replacing them with
of the transformer. When replacing the transformer,
components rated for higher voltage, wattage, etc.
follow these steps carefully and precisely to prevent
Parts that have special safety characteristics are iden-
shock hazards.
tified by a ! on schematics and in parts lists. Use of a
Replacement procedure
substitute replacement that does not have the same
safety characteristics as the recommended replace- 1)Remove the old connector by cutting the wires at a
ment part might create shock, fire, and/or other haz- point close to the connector.
ards. The Product's Safety is under review Important: Do not re-use a connector. (Discard it.)
continuously and new instructions are issued when- 2)Strip about 15 mm of the insulation from the ends
ever appropriate. Prior to shipment from the factory, of the wires. If the wires are stranded, twist the
our products are carefully inspected to confirm with strands to avoid frayed conductors.
the recognized product safety and electrical codes of 3)Align the lengths of the wires to be connected.
the countries in which they are to be sold. However, in Insert the wires fully into the connector.
order to maintain such compliance, it is equally impor-
4)Use a crimping tool to crimp the metal sleeve at its
tant to implement the following precautions when a set
center. Be sure to crimp fully to the complete clo-
is being serviced.
sure of the tool.
Precautions during Servicing L. When connecting or disconnecting the internal
connectors, first, disconnect the AC plug from the
A. Parts identified by the ! symbol are critical for AC outlet.
safety. Replace only with part number specified.
B. In addition to safety, other parts and assemblies
are specified for conformance with regulations
applying to spurious radiation. These must also be
replaced only with specified replacements.
Examples: RF converters, RF cables, noise block-
ing capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1)Wires covered with PVC tubing
2)Double insulated wires
3)High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1)Insulation tape
2)PVC tubing
3)Spacers
4)Insulators for transistors
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely about the terminals before solder-
ing.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fus-
ible resistors, etc.).
G. Check that replaced wires do not contact sharp
edges or pointed parts.
H. When a power cord has been replaced, check that
5 - 6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
1-2-1 U29PSFP
Safety Check after Servicing
Examine the area surrounding the repaired location for Chassis or Secondary Conductor
damage or deterioration. Observe that screws, parts,
and wires have been returned to their original posi- Primary Circuit Terminals
tions. Afterwards, do the following tests and confirm
the specified values to verify compliance with safety d' d
standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d), (d') Fig. 1
3mm(d)
220 to 240 V
6 mm(d') Exposed Accessible Part
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 AC Voltmeter
between B (earth ground, power cord plug prongs) Z (High Impedance)
and externally exposed accessible parts (RF termi-
nals, antenna terminals, video and audio input and
output terminals, microphone jacks, earphone jacks,
etc.) is lower than or equal to the specified value in the
table below. One side of
B
Measuring Method (Power ON) : Power Cord Plug Prongs
Insert load Z between B (earth ground, power cord Fig. 2
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.
Table 2: Leakage current ratings for selected areas
One side of power cord plug
AC Line Voltage Load Z Leakage Current (i)
prongs (B) to:
2k RES.
i0.7mA AC Peak RF or
Connected in
i2mA DC Antenna terminals
parallel
220 to 240 V
50k RES.
i0.7mA AC Peak
Connected in A/V Input, Output
i2mA DC
parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
1-2-2 U29PSFP
STANDARD NOTES FOR SERVICING
Circuit Board Indications Pb (Lead) Free Solder
a. The output pin of the 3 pin Regulator ICs is indi- When soldering, be sure to use the Pb free solder.
cated as shown.
Top View Bottom View
How to Remove / Install Flat Pack-IC
Input 1. Removal
Out In
With Hot-Air Flat Pack-IC Desoldering Machine:.
(1) Prepare the hot-air flat pack-IC desoldering
b. For other ICs, pin 1 and every fifth pin are indicated machine, then apply hot air to the Flat Pack-IC
as shown. (about 5 to 6 seconds). (Fig. S-1-1)
5
Pin 1
10
c. The 1st pin of every male connector is indicated as
shown.
Pin 1 Fig. S-1-1
(2) Remove the flat pack-IC with tweezers while apply-
ing the hot air.
Instructions for Connectors
(3) Bottom of the flat pack-IC is fixed with glue to the
1. When you connect or disconnect the FFC (Flexible CBA; when removing entire flat pack-IC, first apply
Foil Connector) cable, be sure to first disconnect soldering iron to center of the flat pack-IC and heat
the AC cord. up. Then remove (glue will be melted). (Fig. S-1-6)
2. FFC (Flexible Foil Connector) cable should be (4) Release the flat pack-IC from the CBA using twee-
inserted parallel into the connector, not at an angle. 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
FFC Cable
Pack-IC.
2. Do not supply hot air to the chip parts around the
flat pack-IC for over 6 seconds because damage to
Connector the chip parts may occur. Put masking tape around
the flat pack-IC to protect other parts from damage.
CBA (Fig. S-1-2)
* Be careful to avoid a short circuit.
1-3-1 NOTE_1
3. The flat pack-IC on the CBA is affixed with glue, so (3) Bottom of the flat pack-IC is fixed with glue to the
be careful not to break or damage the foil of each CBA; when removing entire flat pack-IC, first apply
pin or the solder lands under the IC when removing soldering iron to center of the flat pack-IC and heat
it. 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)
Hot-air
Flat Pack-IC With Iron Wire:
Desoldering (1) Using desoldering braid, remove the solder from all
Machine pins of the flat pack-IC. When you use solder flux
CBA
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
Masking Flat Pack-IC
Tape iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA contact
Tweezers
pads as shown in Fig. S-1-5
Fig. S-1-2 (4) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
With Soldering Iron: soldering iron to center of the flat pack-IC and heat
(1) Using desoldering braid, remove the solder from all up. Then remove (glue will be melted). (Fig. S-1-6)
pins of the flat pack-IC. When you use solder flux (5) Release the flat pack-IC from the CBA using twee-
which is applied to all pins of the flat pack-IC, you zers. (Fig. S-1-6)
can remove it easily. (Fig. S-1-3)
Note:
When using a soldering iron, care must be taken
Flat Pack-IC Desoldering Braid
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.
Hot Air Blower
Soldering Iron
Fig. S-1-3
or
(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 Iron Wire
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Sharp
Pin
Fine Tip
Soldering Iron
Fig. S-1-4
1-3-2 NOTE_1
Instructions for Handling
Semi-conductors
Fine Tip Electrostatic breakdown of the semi-conductors may
CBA Soldering Iron occur due to a potential difference caused by electro-
static charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1M) that is prop-
erly grounded to remove any static electricity that may
be charged on the body.
Flat Pack-IC
Tweezers 2. Ground for Workbench
Be sure to place a conductive sheet or copper plate
Fig. S-1-6 with proper grounding (1M) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on cloth-
2. Installation ing will not escape through the body grounding band,
(1) Using desoldering braid, remove the solder from be careful to avoid contacting semi-conductors with
the foil of each pin of the flat pack-IC on the CBA so your clothing.
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.
CBA
Example :
Grounding Band
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
1M
Presolder CBA
1M
Conductive Sheet or
Copper Plate
Flat Pack-IC
CBA
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 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.
Q505 Q504
TP507
S-INH
Fig. 1
1-4-1 HG240PFS
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart (1): Identification (location) No. of parts in the figures
(2): Name of the part
This flowchart indicates the disassembly steps to gain
(3): Figure Number for reference
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and (4): Identification of parts to be removed, unhooked,
dress the cables as they were originally. unlocked, released, unplugged, unclamped, or
desoldered.
[1] Top Case P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
[2] Front Assembly
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
[3] VCR Chassis Unit
(5): Refer to "Reference Notes."
[4] Jack CBA Reference Notes
CAUTION: Locking Tabs (L-1) and (L-2) are fragile.
[5] Deck Assembly
Be careful not to break them.
1. Remove five Screws (S-2), three Screws (S-3) and
[6] Main CBA Screw (S-4). Then, slowly lift the VCR Chassis Unit
(Deck Assembly, Jack CBA and Main CBA) up.
[7] Cylinder Shield
2. When reassembling, solder wire jumpers as shown
in Fig. D5.
[8] Jack Board
3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
2. Disassembly Method Fig. D6. Then, install the Deck Assembly while
aligning the hole of Cam Gear with the pin of LD-
REMOVAL SW, the shaft of Cam Gear with the hole of LD-SW
ID/ as shown in Fig. D6.
LOC PART REMOVE/*UNHOOK/
.No. Fig.
No. UNLOCK/RELEASE/ Note
UNPLUG/DESOLDER
[1] Top Case D1 7(S-1) - (S-1)
Front (S-1)
[2] D2 *3(L-1),*4(L-2) -
Assembly
VCR Chassis D3-1
[3] 5(S-2), 3(S-3), (S-4) 1
Unit D3-2
[4] Jack CBA D4 Desolder, (S-5) -
Deck D5 [1] Top Case
[5] 2(S-6), Desolder 2,3
Assembly D6
[6] Main CBA D5 *(L-3) -
(S-1)
Cylinder
[7] D5 (S-7) -
Shield
[8] Jack Board D5 ---------- -
(1) (2) (3) (4) (5)
Fig. D1
1-5-1 HG450DC
(L-2)
(L-2) [4] Jack CBA
(S-5)
Desolder
[2] Front
Assembly
Fig. D4
(L-1)
Fig. D2
(S-2)
(S-2) (S-3)
(S-3) (S-2)
(S-4)
[3]VCR
Chassis
Unit (S-3)
(S-2)
Fig. D3
1-5-2 HG450DC
[7] Cylinder Shield
Pin
Cylinder Assembly
FE Head
(S-7)
SW507
ACE Head LD-SW
Assembly
[6] Main CBA
[8] Jack Board [5] Deck [5] Deck Assembly
Assembly
(L-3) Cam Gear
Hole
Shaft
Hole
[6] Main CBA LD-SW Pin
[6] Main CBA
(S-6)
Fig. D6
(S-6)
TOP VIEW From
From Capstan Motor
Cylinder From Assembly
From ACE Head
Assembly
FE Head Assembly Lead with
blue stripe
Printing
Lead with side
Lead with
blue stripe
white stripe
Desolder
from bottom
Lead connections of Deck Assembly and Main CBA
Fig. D5
1-5-3 HG450DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is an abbreviation for Head Switching Position Adjustment
"Circuit Board Assembly."
Purpose:
NOTE:
To determine the Head Switching position during
1.Electrical adjustments are required after replacing
playback.
circuit components and certain mechanical parts.
It is important to do these adjustments only after Symptom of Misadjustment:
all repairs and replacements have been com- May cause Head Switching noise or vertical jitter
pleted. Also, do not attempt these adjustments in the picture.
unless the proper equipment is available.
2.To perform these alignment / confirmation proce- Test point Adj.Point Mode Input
dures, make sure that the tracking control is set in
the center position: Press either "L5? " or "K" button J23(V-OUT) VR501
PLAY
on the remote control unit first, then the "PLAY" TP502(RF-SW) (Switching Point) -----
(SP)
button (Front Panel only). GND (MAIN CBA)
Test Equipment Required Measurement
Tape Spec.
Equipment
1.Oscilloscope: Dual-trace with 10:1 probe,
6.5H±1H
V-Range: 0.001~50V/Div., FL6A Oscilloscope
(412.7µs±63.5µs)
F-Range: DC~AC-20MHz
2.Alignment Tape (FL6A) Connections of Measurement Equipment
Oscilloscope
J23
Main CBA GND
TP502
CH1 CH2
Trig. (+)
Figure 1
EXT. Syncronize Trigger Point
CH1
1.0H 0.5H
CH2 6.5H+/-1H (412.7µs+/-63.5µs) V-Sync
Switching Pulse
Reference Notes:
Playback the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output wave-
form is at the 6.5H±1H(412.7µs±63.5µs) delayed posi-
tion from the rising edge of the CH2 head switching
pulse waveform.
1-6-1 HG240EA
Q504
ST-S
AL+5V IC501 TP507
MAIN CBA (SERVO/SYSTEM CONTROL)
SENS-INH
SENSOR CBA SW507 RS501
LD-SW D502 REMOTE KEY
SENSOR 14 REMOCON-IN KEY- 1 7
S-LED SWITCH
KEY
KEY- 2 8
SWITCH
AL+5V 9 LD-SW
Q505 10 ST-S FP562
END-S 4 END-S IC561
(LED DISPLAY) LED DISPLAY
95 CTL(+) DRV-DATA 68 28 DRV-DATA D1 23
SENSOR CBA TP506 94 CTL(-) DRV-STB 69 2 DRV-STB D2 22
END-S DRV-CLK 70 1 DRV-CLK D3 21
80 T-REEL D4 20
(DECK ASSEMBLY) 79 S-REEL a 17
Q503 PS503 b 16
T-REEL S-REEL c 14
Q501 d 13
AC HEAD ASSEMBLY e 12
TIMER+5V RESET 34 RESET
f 7
CN504 TU701(TUNER UNIT)
CL504 j 11 3 SDA
CONTROL 2 CTL(+)
HEAD 1 CTL(-) 12 SDA
AL+5V 5 SCL
11 SCL
VR501
SW-POINT 2 PG-DELAY
IC503 (MEMORY)
Servo/System Control Block Diagram
1-7-1
5 SDA
AL+5V 31 REC-SAF-SW
6 SCL
SW506
REC-SAFETY
IIC-BUS SDA
IIC-BUS SCL TO
A-MUTE-H AUDIO BLOCK
CYLINDER ASSEMBLY CAPSTAN MOTOR A-MUTE-H 83
CN502
12 P-ON+15V P-ON+15V IIC-BUS SDA
PG 11 AL+12V(2) AL+12V IIC-BUS SCL
FROM/TO
BLOCK DIAGRAMS
SENSOR 10 GND Hi-Fi-H-SW Hi-Fi AUDIO
Hi-Fi-H-SW 19
9 D-PFG 90 D-PFG A-MODE BLOCK
A-MODE 32
DRUM 8 D-CONT 77 D-CONT LINE-MUTE
LINE-MUTE 28
MOTOR M 7 LM-FWD/REV 81 LM-FWD/REV
6 GND IIC-BUS SDA
5 C-CONT 76 C-CONT IIC-BUS SDA 72
CAPSTAN IIC-BUS SCL
4 C-F/R 78 C-F/R IIC-BUS SCL 71
MOTOR M D-REC-H
3 C-FG 87 C-FG D-REC-H 33
RF-SW
2 P-ON+5V P-ON+5V RF-SW 18
LOADING M C-ROTA
MOTOR 1 AL+12V/+20.5V AL+12V/+20.5V C-ROTA 15
D-V-SYNC
D-V-SYNC 13 FROM/TO
H-A-SW VIDEO BLOCK
H-A-SW 16
H-A-COMP
C-POW-SW H-A-COMP 17
FROM/TO 66 C-POW-SW V-ENV
POWER P-ON-H V-ENV 6
67 P-ON-H C-SYNC
SUPPLY P-DOWN-L C-SYNC 58
BLOCK 86 P-DOWN-L
HG460BLS
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
MAIN CBA
IC501 (OSD) IIC-BUS SCL FROM
IIC-BUS SDA SERVO/SYSTEM
CONTROL BLOCK
OSD 50
52 CHARACTER
MIX
COLOR 55
-IN
IC301
Q351 BUFFER (Y/C SIGNAL PROCESS) 65 43 46 68 69 78 79
Video Block Diagram
(DECK ASSEMBLY)
SERIAL
Y. DELAY DECORDER
CYLINDER ASSEMBLY
CN253
R P 96 V(R)-1 1 VIDEO (R)-1
LUMINANCE SP SP 95 V-COM 2 HEAD
SIGNAL HEAD
TU701(TUNER UNIT) PROCESS EP AMP 93 V(L)-1 3 VIDEO (L)-1
94 V(L)-2 4 HEAD
TUNER V-COM 5
VIDEO OUT 24 48 BYPASS AGC VIDEO (L)-2
IN1 V(R)-2 6 HEAD
50
IN2
52 VIDEO (R)-2
FRT HEAD
JK756 54 90
FRONT
V-IN 56 IN2 CHARA. EP 89
FRT INS. Y HEAD
AMP 88
1-7-2
CCD 1H DELAY WF1
PB/EE + REC FM 87
AGC TP502
MUTE 1/2 C
RF-SW
TUNER
IN1 CHROMINANCE
SIGNAL D-REC-H
PB/EE PROCESS D-REC-H 80
RF-SW
MUTE R PR P
C-ROTA
C-ROTA/RF-SW 70
D-V-SYNC
JACK CBA FBC Y/C D-V-SYNC 62 FROM/TO SERVO/SYSTEM
WF3 H-A-SW CONTROL BLOCK
MIX H-A-SW 71
J23 H-A-COMP
H-A-COMP 83
V-OUT