Tokai LT-VHS-36 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
14" COLOR TV/VCR COMBINATION
LT-VHS-36
SECAMPAL
MAIN SECTION
14" COLOR TV/VCR COMBINATION
LT-VHS-36
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
Mechanical Trouble Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-7
Schematic Diagrams / CBA’s and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1
System Control Timing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1
IC Pin Function Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1
Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1
Cabinet Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1
Packing Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-3
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16-1
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 T6608SP
SPECIFICATIONS
*ˆMode---------SP mode unless otherwise specified
*Test input terminal
<Except Tuner>-------------Video input (1Vp-p)
Audio input (-10dB)
<Tuner>-----------------------Ant. input (80dBµV) Video: 87.5% mod.(BG/DK), 80.0% mod.(I)
Audio: 30kHz div (1kHz Sin)
<DEFLECTION>
<VIDEO & CHROMA>
<VCR>
<TUNER>
Description Condition Unit Nominal Limit
1. Over Scan — % 90 85/95
2. Linearity Horizontal % — ±15
Ver ti ca l % — ± 10
3. High Voltage — kV 22 —
Description Condition Unit Nominal Limit
1. Misconvergence Center m/m — 0.6
Corner m/m — 2.0
Side m/m — 1.5
2. Contrast Control Range — dB — 6
3. Brightness APL 100% ft-L 55 40
4. Color Temperature — K 8500 —
Description Condition Unit Nominal Limit
1. Horizontal Resolution (R/P) Line 230 200
2. Jitter (Low) (R/P) µS 0.05 0.2
3. S/N Chroma AM(SP) (R/P) dB 38 33
PM(SP) (R/P) dB 36 33
4. Wow & Flutter (RMS) (R/P) % 0.25 0.5
Description Condition Unit Nominal Limit
1. Video S/N — dB 45 40
2. Audio S/N (W/LPF) — dB 43 40
1-1-2 T6608SP
<AUDIO>
All items are measured across 8Ω resistor at speaker output terminal.
Note: Nominal specifications represent the design specifications. All units should be able to approximate these.
Some will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute worst condition that still might be considered acceptable. In no case should a unit fail to meet limit specifications.
<TV NORM, TUNER SENSIVITY, RECEPTIVE TV CHANNELS>
Description Condition Unit Nominal Limit
1. Audio Output Power (Max.) (R/P) W 1.0 0.8
2. Audio S/N (W/LPF) (R/P) dB 40 36
3. Audio Distortion (W/LPF) (R/P) % 3.0 5.0
4. Audio Freq. Response
(-20dB Ref. 1kHz)
200Hz (R/P)
6kHz (R/P)
dB
dB
—
—
5.0/-10
5.0/-10
TV Norm Tuner Sensivity Receptive TV Channels
SECAM-L/L’
NOM: VHF 47dBµV / UHF 47dBµV
MAX: VHF 54dBµV / UHF 57dBµV
F1 - F10, E21 - E69, FB - FQ, S4 - S41
PA L- B /G
NOM: VHF 46dBµV / UHF 47dBµV
MAX: VHF 53dBµV / UHF 56dBµV
E2 - E12, IA - IH, E21 - E69, S01 - S03,
Z+1, Z+2, S1 - S41, gap2
1-2-1 T6600SFTY
IMPORTANT SAFETY PRECAUTIONS
Prior to shipment from the factory, our products are strictly inspected for 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.
Safety Precautions for TV Circuit
1. Before returning an instrument to the customer, always make a safety check of the entire instru-
ment, including, but not limited to, the following
items:
a. Be sure that no built-in protective devices are de-
fective and have been defeated during servicing.
(1) Protective shields are provided on this chassis
to protect both the technician and the customer.
Correctly replace all missing protective shields, including any removed for servicing convenience.
(2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place
all protective devices, including but not limited to,
nonmetallic control knobs, insulating fishpapers,
adjustment and compartment covers/shields, and
isolation resistor/capacitor networks. Do not oper-
ate this instrument or permit it to be operated
without all protective devices correctly installed and functioning. Servicers who defeat
safety features or fail to perform safety checks
may be liable for any resulting damage.
b. Be sure that there are no cabinet openings through
which an adult or child might be able to insert their
fingers and contact a hazardous voltage. Such
openings include, but are not limited to, (1) spacing between the picture tube and the cabinet
mask, (2) excessively wide cabinet ventilation
slots, and (3) an improperly fitted and/or incorrectly
secured cabinet back cover.
c. Antenna Cold Check - With the instrument AC
plug removed from any AC source, connect an
electrical jumper across the two AC plug prongs.
Place the instrument AC switch in the on position.
Connect one lead of an ohmmeter to the AC plug
prongs tied together and touch the other ohmmeter lead in turn to each tuner antenna input exposed terminal screw and, if applicable, to the
coaxial connector. If the measured resistance is
less than 1.0 megohm or greater than 5.2 megohm, an abnormality exists that must be corrected
before the instrument is returned to the customer.
Repeat this test with the instrument AC switch in
the off position.
d. Leakage Current Hot Check - With the instru-
ment completely reassembled, plug the AC line
cord directly into a 120V AC outlet. (Do not use an
isolation transformer during this test.) Use a leak-
age current tester or a metering system that complies with American National Standards Institute
(ANSI) C101.1 Leakage Current for Appliances
and Underwriters Laboratories (UL) 1410, (50.7).
With the instrument AC switch first in the on position and then in the off position, measure from a
known earth ground (metal water pipe, conduit,
etc.) to all exposed metal parts of the instrument
(antennas, handle brackets, metal cabinet, screw
heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current
measured must not exceed 0.5 milli-ampere. Reverse the instrument power cord plug in the outlet
and repeat the test.
ANY MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE ELIMINATED
BEFORE RETURNING THE INSTRUMENT TO
THE CUSTOMER OR BEFORE CONNECTING
THE ANTENNA OR ACCESSORIES.
e. X-Radiation and High Voltage Limits - Because
the picture tube is the primary potential source of
X-radiation in solid-state TV receivers, it is specially constructed to prohibit X-radiation emissions.
For continued X-radiation protection, the replacement picture tube must be the same type as the
original. Also, because the picture tube shields
and mounting hardware perform an X-radiation
protection function, they must be correctly in place.
High voltage must be measured each time servic-
DEVICE
LEAKAGE
CURRENT
TESTER
ALSO TEST WITH
PLUG REVERSED
USING AC
ADAPTER PLUG
AS REQUIRED
TEST ALL EXPOSED
METAL SURFACES
READING SHOULD
NOT BE ABOVE 0.5 mA
EARTH
GROUND
BEING
TESTED
1-2-2 T6600SFTY
ing is performed that involves B+, horizontal deflection or high voltage. Correct operation of the
X-radiation protection circuits also must be reconfirmed each time they are serviced. (X-radiation
protection circuits also may be called "horizontal
disable" or "hold down.") Read and apply the high
voltage limits and, if the chassis is so equipped,
the X-radiation protection circuit specifications given on instrument labels and in the Product Safety
& X-Radiation Warning note on the service data
chassis schematic. High voltage is maintained
within specified limits by close tolerance safety-related components/adjustments in the high-voltage
circuit. If high voltage exceeds specified limits,
check each component specified on the chassis
schematic and take corrective action.
2. Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the
receiver chassis, or on the picture tube.
3. Design Alteration Warning - Do not alter or add
to the mechanical or electrical design of this TV receiver. Design alterations and additions, including,
but not limited to circuit modifications and the addition of items such as auxiliary audio and/or video
output connections, might alter the safety characteristics of this receiver and create a hazard to the
user. Any design alterations or additions will void
the manufacturer's warranty and may make you,
the servicer, responsible for personal injury or
property damage resulting therefrom.
4. Picture Tube Implosion Protection Warning -
The picture tube in this receiver employs integral
implosion protection. For continued implosion protection, replace the picture tube only with one of
the same type number. Do not remove, install, or
otherwise handle the picture tube in any manner
without first putting on shatterproof goggles
equipped with side shields. People not so
equipped must be kept safely away while picture
tubes are handled. Keep the picture tube away
from your body. Do not handle the picture tube by
its neck. Some "in-line" picture tubes are equipped
with a permanently attached deflection yoke; because of potential hazard, do not try to remove
such "permanently attached" yokes from the picture tube.
5. Hot Chassis Warning -
a. Some TV receiver chassis are electrically connect-
ed directly to one conductor of the AC power cord
and maybe safety-serviced without an isolation
transformer only if the AC power plug is inserted
so that the chassis is connected to the ground side
of the AC power source. To confirm that the AC
power plug is inserted correctly, with an AC voltmeter, measure between the chassis and a known
earth ground. If a voltage reading in excess of 1.0V
is obtained, remove and reinsert the AC power
plug in the opposite polarity and again measure
the voltage potential between the chassis and a
known earth ground.
b. Some TV receiver chassis normally have 85V
AC(RMS) between chassis and earth ground regardless of the AC plug polarity. This chassis can
be safety-serviced only with an isolation transformer inserted in the power line between the receiver
and the AC power source, for both personnel and
test equipment protection.
c. Some TV receiver chassis have a secondary
ground system in addition to the main chassis
ground. This secondary ground system is not isolated from the AC power line. The two ground systems are electrically separated by insulation
material that must not be defeated or altered.
6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas: a.
near sharp edges, b. near thermally hot parts-be
sure that leads and components do not touch thermally hot parts, c. the AC supply, d. high voltage,
and e. antenna wiring. Always inspect in all areas
for pinched, out of place, or frayed wiring. Check
AC power cord for damage.
7. Components, parts, and/or wiring that appear to
have overheated or are otherwise damaged
should be replaced with components, parts, or wiring that meet original specifications. Additionally,
determine the cause of overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard.
8. 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 strictly 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.
1-2-3 T6600SFTY
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
edged 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. Use care that foreign objects (screws, solder drop-
lets, etc.) do not remain inside the set.
K. Crimp type wire connector
When replacing the power transformer in sets
where the connections between the power cord
and power transformer primary lead wires are performed using crimp type connectors, in order to
prevent shock hazards, perform carefully and precisely the following steps.
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 the crimping tool to crimp the metal sleeve at
the center position. Be sure to crimp fully to the
complete closure of the tool.
L. When connecting or disconnecting the VCR con-
nectors, first, disconnect the AC plug from AC supply socket.
1-2-4 T6600SFTY
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 original positions.
Afterwards, perform the following tests and confirm the
specified values in order 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.).
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 both terminals of load
Z. See Fig. 2 and following table.
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 Clearance Distance (d), (d’)
220 to 240 V
≥ 3mm(d)
≥ 6 mm(d’)
Chassis or Secondary Conductor
dd’
Primary Circuit Terminals
Fig. 1
Fig. 2
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
AC Line Voltage Load Z Leakage Current (i)
One side of power cord plug
prongs (B) to:
220 to 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 T6600STA
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is indicated as shown:
2. For other ICs, pin 1 and every 5th pin is indicated
as shown:
3. The 1st pin of every pin connector are indicated as
shown:
Instructions for Connectors
1. When you connect or disconnect FFC cable (connector), be sure to disconnect the AC cord.
2. FFC cable (connector) should be inserted parallel
into the connector, not at an angle.
[ CBA= Circuit Board Assembly ]
How to Read the Values of the Rectangular Type Chip Components
Example:
(a) Resistor
(b) Capacitor
Caution:
Once chip parts (Resistors, Capacitors, Transistors,
etc.) are removed, they must not be reused. Always
use a new part.
Pb (Lead) Free Solder
Pb free mark will be found on PCBs used Pb free
solder. (Refer to figure.) For PCBs with Pb free
mark, be sure to use Pb free solder. For PCBs
without Pb free mark, use standard solder.
Replacement Procedures for
Leadless (Chip) Components
The Following Procedures are Recommended for the Replacement of the Leadless Components Used in this Unit.
1. Preparation for replacement
1.1. Pb free solder
a. Soldering Iron
Use a soldering iron for Pb free solder.
b. Solder
Be sure to use Pb free solder.
c. Soldering time
Do not apply heat for more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before
installation. (130°C~150°C, for about two minutes.)
Top View
Out
In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
(Top View)
473
= 473 = 47 [kΩ]
(Top View)
= Not Shown
Pb free mark
1-3-2 T6600STA
1.2. Standard solder
e. Soldering Iron
Use a pencil-type soldering iron (less than 30
watts).
f. Solder
Eutectic solder (Tin 63%, Lead 37%) is recommended.
g. Soldering time
Do not apply heat for more than 4 seconds.
h. Preheating
Leadless capacitor must be preheated before
installation. (130°C~150°C, for about two minutes.)
Notes:
a. Leadless components must not be reused after
removal.
b. Excessive mechanical stress and rubbing for the
component electrode must be avoided.
2. Removing the leadless component
Grasp the leadless component body with tweezers
and alternately apply heat to both electrodes. When
the solder on both electrodes has melted, remove
leadless component with a twisting motion.
Notes:
a. Do not attempt to lift the component off the board
until the component is completely disconnected
from the board by the twisting action.
b. Take care not to break the copper foil on the printed
board
3. Installing the leadless component
a. Presolder the contact points of the circuit board.
b. Press the part downward with tweezers and solder
both electrodes as shown below.
Note:
Do not glue the replacement leadless component to
the circuit board.
How to Remove / Install Flat Pack IC
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 PackIC.
2. Do not apply the hot air to the chip parts around the
Flat Pack-IC for over 6 seconds as damage may
occur to the chip parts. Put Masking Tape around
the Flat Pack-IC to protect other parts from damage. (Fig. S-1-2)
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 solder lands under the IC when removing it.
1. Removal
With Hot - Air Flat Pack - IC Desoldering Machine:
a. Prepare the Hot - Air Flat Pack - IC Desoldering
Machine, then apply hot air to Flat Pack - IC (about
5~6 seconds). (Fig. S-1-1)
b. Remove the Flat Pack- IC with tweezers while
applying the hot air.
With Soldering Iron:
a. 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)
b. 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)
With Iron Wire:
a. 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)
Chip
Tweezers
Soldering Iron
Soldering Iron
Tweezers
Solder
Soldering Iron
Presolder
1-3-3 T6600STA
b. Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
c. Pull up on the wire as the solder melts so as to lift
the IC leads from the CBA contact pads, while
heating the pins using a fine tip soldering iron or
hot air blower.
Note:
When using a soldering iron, care must be taken
to ensure that the Flat Pack - IC is not being held
by glue, or when it is removed from the CBA, it
may be damaged if force is used.
2. Installation
a. 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.
b. The "I" mark on the Flat Pack - IC indicates pin 1
(See Fig. S-1-6). Make sure this mark matches the
1 on the CBA when positioning for installation.
Then pre - solder the four corners of the Flat PackIC (See Fig. S-1-7).
c. Solder all pins of the Flat Pack - IC. Make sure that
none of the pins have solder bridges.
Fig. S-1-1
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
Fig. S-1-6
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
1-3-4 T6600STA
Instructions for Handling
Semiconductors
Electrostatic breakdown of the semiconductors may
occur due to a potential difference caused by electrostatic charge during unpacking or repair work.
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.
Ground for Work Bench
Be sure to place a conductive sheet or copper plate
with proper grounding (1MΩ) on the work bench or
other surface, where the semiconductors are to be
placed. Because the static electricity charge on the
clothing will not escape through the body grounding
band, be careful to avoid contacting semiconductors to
clothing.
Fig. S-1-7
Presolder
CBA
Flat Pack-IC
<Incorrect>
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
<Correct>
CBA
1-4-1 T6600PFS
PREPARATION FOR SERVICING
How to Enter the Service Mode
Caution: 1
1. Optical sensors system are used for Tape Start and
End Sensor on this equipment. Read this page
carefully and prepare as described on this page
before starting to service; otherwise, the unit may
operate unexpectedly.
Preparing: 1
1. Cover Q202 (START SENSOR) and Q201 (END
SENSOR) with Insulation Tape or enter the service
mode to activate Sensor Inhibition automatically.
Note: Avoid playing, rewinding or fast forwarding the
tape to its beginning or end, because both Tape End
Sensors are not active.
How to Enter the Service Mode
1. Turn the power on. (Use main power on the TV
unit.)
2. Press [STANDBY/ON], [2], [7], [1], and [MUTE] buttons on the remote control unit in that order within 5
seconds. When entering the service mode, “4” will
display at corners of the screen.
3. During the service mode, electrical adjustment
mode can be selected by remote control key.
Details are as follows.
Caution: 2
1. The deck mechanism assembly is mounted on the
Main CBA directly, and SW211 (REC-SAFETY
SW) is mounted on the Main CBA. When deck
mechanism assembly is removed from the Main
CBA due to servicing, this switch can not be operated automatically.
Preparing: 2
1. To eject the tape, press the STOP/EJECT button
on the unit (or Remote Control).
2. When you want to record during the Service mode,
press the Rec button while depressing SW211
(REC-SAFETY SW) on the Main CBA.
Key Adjustment Mode
MENU
Picture adjustment mode: Press the
MENU button to change from BRT
(Bright), *CNT (Contrast), *COL
(Color), *TNT(Tint) and SHP(SHARP).
Press PROG+/PROG- key to adjust
Initial Value. *Marked items are not
necessary to adjust normally.
VOL-
SECAM Black Level adjustment mode:
See adjustment instructions page
1-6-3.
Cut-Off adjustment mode: See adjustment instructions page 1-6-4.
White Balance adjustment mode: See
adjustment instructions page 1-6-5.
0
C-Trap adjustment mode: See adjustment instructions page 1-6-3.
1 No need to use.
2
H adjustment mode: See adjustment
instructions page 1-6-2.
3
Head switching point adjustment mode
(Auto adjustment): See adjustment
instructions page 1-6-7.
4
Auto record mode: Perform recording
(15 Sec.)-->Stop-->Rewind (Zero
return) automatically.
5
Head switching point adjustment mode
(Manual adjustment): See adjustment
instructions page 1-6-7.
6 No need to use.
7 No need to use.
8
H. Shift adjustment mode: See adjustment instructions page 1-6-4.
9
V.size/V. shift adjustment: See adjustment instructions page 1-6-4.
Key Adjustment Mode
(START SENSOR)
(END SENSOR)
(REC-SAFETY SW)
MAIN CBA
Q201
SW211
Q202
1-5-1 T6608DC
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps for the
cabinet parts, and the CBA in order 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.
Caution !!
When removing the CRT, be sure to discharge the
Anode Lead of the CRT with the CRT Ground Wire
before removing the Anode Cap.
2. Disassembly Method
(1): Order of steps in Procedure. When reassembling,
follow the steps in reverse order.These numbers
are also used as the identification (location) No. of
parts in Figures.
(2): Parts to be removed or installed.
(3): Fig. No. showing Procedure of Part Location.
(4): Identification of part to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connec-
tor, *=Unhook, Unlock, Release, Unplug, or Desol-
der
2(S-2) = two Screw (S-2)
(5): Refer to the following "Reference Notes in the
Ta bl e ."
Reference Notes in the Table
1. Removal of the Rear Cabinet.
Remove four screws (S-1) and two screws (S-2).
Disconnect connector CN151 and remove the Rear
Cabinet.
Caution !!
Discharge the Anode Lead of the CRT with the CRT
Ground Wire before removing the Anode Cap.
2. Removal of the Power Unit and Tray Chassis Unit.
Discharge the Anode Lead of the CRT with the
CRT Ground before removing the Anode Cap.
Disconnect the following: Anode Cap, CN501,
CN551, CN601, CRT CBA, and Power Button.
Then pull the Power Unit and Tray Chassis Unit out
backward.
3. Removal of the Power Unit.
Disconnect connectors CN502, CN552, and
CN602. Then slide the Power Unit out.
4. Removal of the H.V./Power Supply CBA.
Remove six screws (S-3) and pull up the H.V./
Power Supply CBA.
5. Removal of the Top Cover.
Remove five screws (S-4) and CL604, and remove
the Top Cover.
ID/
LOC.
No.
PAR T
REMOVAL
Fig.
No.
REMOVE/
*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/
DESOLDER
Note
[1]
Rear
Cabinet
1,2,5
4(S-1), 2(S-2),
*CN151
1
[2]
Power Unit
and Tray
Chassis
Unit
3,4,5
Anode Cap, *CN501,
*CN551, *CN601,
CRT CBA, Power
Knob
2
[3] Power Unit 3,5
*CN502, *CN552,
*CN602
3
[4]
Tr ay
Chassis
Unit
3 ---------- -
[5]
H.V./Power
Supply
CBA
36(S-3) 4
[6] Top Cover 3 5(S-4), CL604 5
[7]
Bottom
Plate
3(S-5) 6
[1] Rear Cabinet
[2] Power Unit and Tray Chassis Unit
[3] Power Unit[5] H.V./Power
Supply CBA
[4] Tray Chassis Unit
[6] Top Cover
[7] Bottom Plate
[8] Deck Unit
[9] Main CBA
[10] CRT
[8] Deck Unit 3, 5
7(S-6), (S-7), (S-8),
Desolder *(CN201,
CL401, CL402,
CL403)
7
[9] Main CBA 3 4(S-9) 8
[10] CRT 4 4(S-10) 9
↓
(1)
↓
(2)
↓
(3)
↓
(4)
↓
(5)
ID/
LOC.
No.
PA RT
REMOVAL
Fig.
No.
REMOVE/
*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/
DESOLDER
Note
1-5-2 T6608DC
6. Removal of the Bottom Plate.
Remove a screw (S-5). Then slide the Bottom Plate
out front.
7. Removal of the Deck Unit.
Remove seven screws (S-6), screw (S-7) and
screw (S-8). Then, desolder connectors (CN201,
CL401, CL402, CL403) and lift up the Deck Unit.
8. Removal of the Main CBA.
Remove four screws (S-9) and pull up the Main
CBA.
9. Removal of the CRT.
Remove four screws (S-10) and pull the CRT backward.
(S-1)
(S-2)
(S-2)
[1] REAR CABINET
(S-1)
Fig. 1
(S-1)
(S-1)
(S-1)
(S-2)
(S-1)
(S-2)
[1] REAR CABINET
Fig. 2
1-5-3 T6608DC
A
A
(S-7)
(S-8)
Fig. 3
[2] Power Unit and
Tray Chassis Unit
[5] H.V./Power
Supply CBA
(S-3)
(S-3)
[3] Power Unit
Power Button
(S-3)
(S-4)
(S-4)
(S-4)
(S-5)
[7] Bottom Plate
CL604
(S-4)
(S-6)
(S-9)
(S-9)
(S-9)
(S-9)
(S-6)
(S-6)
(S-6)
[8] Deck Unit
[6] Top Cover
[10] Main CBA
[4] Tray
Chassis Unit
1-5-4 T6608DC
Fig. 4
(S-10)
(S-10)
(S-10)
(S-10)
Anode Cap
[11] CRT
CRT CBA
1-5-5 T6608DC
CN151
TO SPEAKER
FE HEAD
CYLINDER
ASSEMBLY
ACE HEAD
ASSEMBLY
CAPSTAN
MOTOR
DECK UNIT
CN201
CL402
CL401
CL403
CL302A
CL603A
CL301A
MAIN CBA
CN501
SCREEN
FOCUS
CN502
CN501B
CL501A
CN601
CN552
CN551
CN602
CRT
ANODE
GND
H.V./POWER SUPPLY CBA
TO DEGAUSS
COIL
CRT CBA
Fig. 5
CL604
TO TOP COVER
1-6-1 T6608EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to perform these adjustments only
after all repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. PAL Pattern Generator (Color Bar, Monoscope,
Black Raster, White Raster, Sympte)
2. SECAM Pattern Generator (Gray Scale)
3. AC Milli Voltmeter (RMS)
4. Alignment Tape (FL6A), Blank Tape (E180)
5. DC Voltmeter
6. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
7. Frequency Counter
8. Plastic Tip Driver
9. RF input (at each broadcasting system)
Receiving Channel : VHF Low
Input level : 80dBµV
10.Ext.input
FRONT VIDEO-IN JACK or REAR SCART JACK
How to Set up the Service mode:
NOTE:
After replacing the IC202 (Memory) or Main CBA,
the set value in IC202 (Memory) will be lost. So it
is necessary to set up or adjust in the Service
mode after its replacement.
Service Mode:
1. Turn the power on. (Use main power on the TV
unit.)
2. Press [STANDBY/ON], [2], [7], [1], and [MUTE] buttons on the remote control unit in that order within 5
seconds.
- To cancel the service mode, press [STANDBY/ON]
button on the remote control.
How to set up the option code
1. Enter the Service mode.
2. Press the [STATUS] button on the remote control
unit. The option code appears on the display.
3. If needed, input the option code (0129) using number buttons on the remote control unit.
4. To reset the software, press [PAUSE] and [5] buttons on the remote control unit.
The option code is changed.
1-6-2 T6608EA
1. DC 105V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Note: TP503(+B), TP504(GND), VR601 --- H.V./Power
Supply CBA
1. Connect the unit to AC Power Outlet. (exact
AC230V)
2. Input a color bar signal from RF (or Ext.) input and
leave it for at least 20 minutes.
3. Connect DC Volt Meter to TP503(+B) and
TP504(GND).
4. Adjust VR601 so that the voltage of TP503(+B)
becomes +105±0.5V DC.
2. H Adjustment
Purpose: To get correct horizontal position and size of
screen image.
Symptom of Misadjustment: Horizontal position and
size of screen image may not be properly displayed.
Note: R590 --- H.V./Power Supply CBA
1. Connect Frequency Counter to R590.
2. Set the unit to the Ext. mode and no input is necessary. Enter the Service mode.
(See page 1-6-1.)
3. Operate the unit for at least 20 minutes.
4. Press [2] button on the remote control unit and
select H-Adj mode.
5. Press [PROG+/PROG-] buttons on the remote control unit so that the display will change [0] to [7.]
At this moment, choose display [0] to [7] when the
Frequency counter display is closest to
15.625kHz±250Hz.
6. Turn the power off and on again.
Test point Adj. Point Mode Input
TP503
(+B),
TP504
(GND)
VR601
RF
(or Ext.)
Color
Bar
Tape M. EQ . Spe c .
---
DC Voltmeter,
Plastic Tip Driver
+105±0.5V DC
Test point Adj. Point Mode Input
R590
PROG+/PROG-
buttons
Ext. ---
Tape M. EQ. Spec.
--- Frequency Counter 15.625kHz±250Hz
1-6-3 T6608EA
3. C-Trap Adjustment
Purpose: To get minimum leakage of the color signal
carrier.
Symptom of Misadjustment: If C-Trap Adjustment is
incorrect, stripes will appear on the screen.
Note: J349F3 (B-Out)--- Main CBA
1. Connect Oscilloscope to J349F3.
2. Input a color bar signal from RF (or Ext.) input.
Enter the Service mode. (See page 1-6-1.)
3. Press [0] button on the remote control unit and
select C-TRAP mode.
4. Press [PROG+/PROG-] buttons on the remote control unit so that the carrier leakage B-Out
(4.43MHz) value becomes minimum on the oscilloscope.
5. Turn the power off and on again.
4. SECAM Black Level Adjustment
Purpose: To set Black Level of the SECAM signal R-
Y/B-Y to Ref. level.
Symptom of Misadjustment: If Black Level of the
SECAM signal R-Y/B-Y is incorrect, the picture is bluish or reddish in grayscale compared with PAL signal.
1. Degauss the CRT and allow CRT to operate for 20
minutes before starting the alignment.
2. Input the SECAM Gray Scale signal from Ext.
input.
3. Enter the service mode. (See page 1-6-1.)
4. To enter the C/D/S mode, press [VOL-] on the
remote control unit.
5. To select SBR (SECAM Black Level R-Y), press [6]
button on the remote control unit.
6. Press [PROG+/PROG-] buttons to adjust Y signal
to the black ref. level.
7. To select SBB (SECAM Black Level B-Y), press [7]
button on the remote control unit.
8. Press [PROG+/PROG-] buttons to adjust Y signal
to the black ref. level.
Test point Adj. Point Mode Input
J349F3
(B-OUT)
PROG+/PROG-
buttons
RF
(or Ext.)
Color Bar
Tape M. EQ. Spec.
---
Oscilloscope,
Pattern Generator
200mVp-p Max.
Figure
minimum
Fig. 1
Tes t
point
Adj. Point Mode Input
J361G4
PROG+/PROG-
buttons
Ext.
SECAM
Gray
Scale
Tape M. EQ. Spec.
---
Pattern Generator,
Analog Oscilloscope (unus-
able Digital Oscilloscope)
---
5mV/Div (10:1 Prove)
Y Signal
1H
1H
1H
Black REF. Level
Fig. 4
1-6-4 T6608EA
5. V. Size Adjustment
Purpose: To obtain correct vertical height of screen
image.
Symptom of Misadjustment: If V. Size is incorrect,
vertical height of image on the screen may not be
properly displayed.
1. Enter the Service mode. (See page 1-6-1.)
Press [9] button on the remote control unit and
select V-S mode. (Press [9] button then display will
change to V-P and V-S).
2. Input monoscope pattern and leave it for at least 20
minutes.
3. Press [PROG+/PROG-] buttons on the remote control unit so that the monoscope pattern is 90±5% of
display size and the circle is round.
6. V. Shift Adjustment
Purpose: To obtain correct vertical position of screen
image.
Symptom of Misadjustment: If V. position is incorrect, vertical position of image on the screen may not
be properly displayed.
1. Enter the Service mode. (See page 1-6-1.)
Press [9] button on the remote control unit and
select V-P mode. (Press [9] button then display will
change to V-P and V-S).
2. Input monoscope pattern and leave it for at least 20
minutes.
3. Press [PROG+/PROG-] buttons on the remote control unit so that the top and bottom of the monoscope pattern are equal to each other.
7. H. Shift Adjustment
Purpose: To obtain correct horizontal position and
size of screen image.
Symptom of Misadjustment: Horizontal position and
size of screen image may not be properly displayed.
1. Enter the Service mode. (See page 1-6-1.)
Press [8] button on the remote control unit and
select H-P mode.
2. Input monoscope pattern and leave it for at least 20
minutes.
3. Press [PROG+/PROG-] buttons on the remote control unit so that the left and right side of the monoscope pattern are equal to each other.
4. Turn the power off and on again.
8. Cut-off Adjustment
Purpose: To adjust the beam current of R, G, B, and
screen voltage.
Symptom of Misadjustment: White color may be
reddish, greenish or bluish.
Notes:
Screen Control (FBT) --- H.V./Power Supply CBA
FBT= Fly Back Transformer
Use the Remote Control Unit
1. Degauss the CRT and allow CRT to operate for 20
minutes before starting the alignment.
2. Set the screen control to minimum position. Input
the Black raster signal from RF (or Ext.) input.
3. Enter the service mode. (See page 1-6-1.)
Dimmed horizontal line appears on the CRT.
4. To enter the C/D/S mode, press the [VOL-] button
on the remote control unit.
5. To enter the CUT OFF (R) mode, press [1] button
on the remote control unit.
6. Turn the screen control up until dimmed horizontal
line appears.
Test point Adj. Point Mode Input
Screen
PROG+/PROG-
buttons
RF
(or Ext.)
Monoscope
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
Test point Adj. Point Mode Input
Screen
PROG+/PROG-
buttons
RF
(or Ext.)
Monoscope
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
Test point Adj. Point Mode Input
Screen
PROG+/PROG-
buttons
RF
(or Ext.)
Monoscope
Tape M. EQ. Spec.
--- Pattern Generator 90±5%
Test point Adj. Point Mode Input
Screen
Screen-Control,
PROG+/PROG-
buttons
RF
(or Ext.)
Black Ras-
ter
Tape M. EQ. Spec.
--- Pattern Generator
See Reference
Notes below
1-6-5 T6608EA
7. Press the [PROG+/PROG-] buttons until the horizontal line becomes white.
8. To enter the CUT OFF (G) mode, press [2] button
on the remote control unit.
9. Press the [PROG+/PROG-] buttons until the horizontal line becomes white.
10.To enter the CUT OFF (B) mode, press [3] button
on the remote control unit.
11.Press the [PROG+/PROG-] buttons until the horizontal line becomes white.
12.Turn the screen control so that the horizontal line
adjusted white looks lightly.
13.Turn the power off and on again.
9. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using Degaussing Coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical receptor to the center on the tube surface (CRT).
5. Enter the Service mode. Press [VOL-] button on
the remote control.
6. Press [4] button on the remote control unit for Red
adjustment. Press [5] button on the remote control
unit for Blue adjustment.
7. In each color mode, Press [PROG+/PROG-] buttons to adjust the values of color.
8. Adjusting Red and Blue color so that the temperature becomes 8500K (x : 290 / y : 300) ±3%.
9. At this time, Re-check that Horizontal line is white.
If not, Re-adjust Cut-off Adjustment until the Horizontal Line becomes pure white.
10. Turn off and on again to return to normal mode. Receive APL 100% white signal and Check Chroma
temperatures become 8500K (x : 290 / y : 300) ±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
Test point Adj. Point Mode Input
Screen
Screen-Control,
PROG+/PROG-
buttons
RF
(or Ext.)
White
Raster
(APL 100%)
Tape M. EQ . Spec.
---
Pattern Generator,
Color analyzer
See below
Figure
Color Ajalyzer
Fig. 5
1-6-6 T6608EA
10. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
Note: Bar (A) in Fig. 7 --- 0 IRE
1. Enter the service mode. (See page 1-6-1.)
Then input SYMPTE signal from RF (or Ext.) input
and leave it for at least 20 minutes.
2. Press [MENU] button. (Each time [MENU] button is
pressed, display will change BRT, CNT, COL, TNT,
and SHP in that order.) Select BRT and press
[PROG+/PROG-] buttons so that the bar (A) in Fig.
6 is just visible.
3. Turn the power off and on again.
11. Setting for CONTRAST,
COLOR, TINT and SHARP
Data Values
General
1. Enter the Service mode. (See page 1-6-1)
2. Press [MENU] button. (Each time [MENU] button is
pressed, display will change BRT, CNT, COL, TNT,
and SHP in that order.)
CONTRAST (CNT)
1. Press [MENU] button on the remote control unit.
Then select CNT display.
2. Press [PROG+/PROG-] buttons on the remote
control unit so that the value of "CONTRAST"
(CNT) becomes 83.
COLOR (COL)
1. Press [MENU] button on the remote control unit.
Then select "COLOR" (COL) display.
2. Press [PROG+/PROG-] buttons on the remote
control unit so that the value of "COLOR" (COL)
becomes 65.
TINT (TNT)
1. Press [MENU] button on the remote control unit.
Then select "TINT" (TNT) display.
2. Press [PROG+/PROG-] buttons on the remote
control unit so that the value of "TINT" (TNT) becomes 68.
SHARP (SHP)
1. Press [MENU] button on the remote control unit.
Then select "SHARP" (SHP) display.
2. Press [PROG+/PROG-] buttons on the remote
control unit and select "1."
Test point Adj. Point Mode Input
Screen
PROG+/PROG-
buttons
RF
(or Ext.)
SYMPTE
Tap e M. EQ. S p e c .
---
Pattern
Generator
See below
Figure
Black
White
This bar
(A) just
visible
ABC
Fig. 6
1-6-7 T6608EA
12. Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Note: Focus VR (FBT) --- H.V./Power Supply CBA
FBT= Fly Back Transformer
1. Operate the unit more than 30 minutes.
2. Face the unit to the East and degauss the CRT
using a Degaussing Coil.
3. Input the monoscope pattern.
4. Adjust the Focus Control on the FBT to obtain clear
picture.
13. Head Switching Position Adjustment
Purpose: Determine the Head Switching Position dur-
ing Playback.
Symptom of Misadjustment: May cause Head
Switching Noise or Vertical Jitter in the picture.
Note: Unit reads Head Switching Position automatically and displays it on the screen (Upper Left Corner).
Manual Adjustment
1. Enter the service mode. (See page 1-6-1.)
2. Playback the test tape (FL6A).
3. Press the number [5] button on the remote control
unit.
4. The Head Switching position will display on the
screen; if adjustment is necessary follow step 4.
7.0H (448µs) is preferable.
5. Press [PROG+/PROG-] buttons on the remote control unit if necessary. The value will be changed in
0.5H steps up or down. Adjustable range is up to
9.5H. If the value is beyond adjustable range, the
display will change as:
Lower out of range: 0.0H
Upper out of range: -.-H
6. Turn the power off and on again.
Auto Adjustment
1. Load the test tape (FL6A) that have been recorded
the Head Switching Position Value.
2. Enter the service mode.
3. Press [3] button on the remote control unit in the
tape stop mode. The unit playback and adjust the
Head Switching Position automatically.
4. The adjusting report appears on upper left corner
of the screen with blueback.
In case of adjusting correctly: the Head Switching
Position Value recorded in the test tape (FL6A) is
indicated with green.
In case of adjusting incorrectly: "NG" (red) is indicated with ejecting tape.
l
Test point Adj. Point Mode Input
Screen Focus Control
RF
(or Ext.)
Monoscope
Tape M . E Q. Spec.
--- Pattern Generator See below.
NG
Incorrect
7.0H
Correct
TVCR TVCR
Fig. 7
1-7-1
BLOCK DIAGRAMS
Servo/System Control Block Diagram
T6608BLS
CONTROL
HEAD
CL402
AC HEAD ASSEMBLY
MAIN CBA
KEY-2
RF-SW
ST-SENS.
T-REEL
KEY-1
DV-SYNC
C-SYNC
C-SYNC
V-ENV
REMOTE
CTL(+)
RESET
C-ROTA
REC-SAFETY
A-MUTE-H
SCL
SDA
A-MUTE-H
CTL(-)
RF-SW
DV-SYNC
V-ENV
C-ROTA
END-SENS.
IC201
(SERVO/SYSTEM CONTROL)
14
94
95
10480
34
18
15613
74
31
20
72
8
7
RS201
REMOTE
SENSOR
CTL AMP-OUT
97
AL+5V
D201
S-LED
CTL
TP001
(DECK
ASSEMBLY
)
END-SENS.
T-REEL
ST-SENS.
Q202 Q205Q201
Q204
RESET
TIMER+5V
32
33
47
EXT-L
SP-MUTE
SP-MUTE
44
SW211
REC
SAFETY
TO
VIDEO BLOCK
TO
AUDIO BLOCK
KEY SWITCH
KEY SWITCH
SW201 SW205
SCL
(MEMORY)
SDA
6
5
REC-LED
24
REC-LED
23
P-DOWN-L
85
P-ON-H
P-DOWN-L
P-ON-H
67
D202 REC
AL+5V
LD-SW9
I
2
C-OPEN
45
71
AL+5V
SW212
LD-SW
CS7
TO POWER
SUPPLY BLOCK
SW206 SW210
SDA
SCL
TO
TV BLOCK
SDA
SCL
IC202
WF3
I
2
C-OPEN
M
M
LOADING
MOTOR
CAPSTAN MOTOR
SENSOR CBA
(ST-SENSOR)
SENSOR CBA
(END-SENSOR)
4C-F/R
1CM+12V
11AL+12V(1)
2P-ON+5V(3)
6FG-GND
3C-FG
5
C-CONT
10M-GND
7LD-CONT
8D-CONT
9
D-PFG
12VG
CN201
C-FG
C-CONT
D-PFG
C-F/R
90
76
87
78
LD-CONT81D-CONT
77
CM+12V
AL+12V(1)
P-ON+5V(3)
CAPSTAN
MOTOR
D-REC-H
SECAM-H
TRICK-H
D-REC-H
SDA
SCL
424829
EXT-L
SCART-H
SCART-MUTE
SCART-H
SCART-MUTE
D204 STANDBY
2CTL(+)
1CTL(-)
+33V
CYLINDER ASSEMBLY
DRUM
MOTOR
PG
SENSOR
M
1-7-2
T6608BLV
Video Block Diagram
CYLINDER ASSEMBLY
V(R)
V-COM
V(L)
CL401
123
(DECK ASSEMBLY)
VIDEO (R)
HEAD
SP
HEAD
AMP
REC FM
AGC
TO SERVO/SYSTEM
CONTROL BLOCK
TO
SERVO/SYSTEM
CONTROL BLOCK
C-SYNC
TRICK-H
RF-SW
D-REC-H
C-ROTA
DV-SYNC
V-ENV
SECAM-H
LUMINANCE
SIGNAL
PROCESS
CHROMINANCE
SIGNAL
PROCESS
PB-H OUT
C-SYNC
V-ENV
DV-SYNC
RF-SW/C-ROTA
VIDEO (L)
HEAD
IC401
(VIDEO/AUDIO SIGNAL PROCESS)
REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC
SERIAL
DECORDER
IC471 (PAL/SECAM DECTECOTR)
PAL/SECAM
DETECTOR
485254
56
61
63
969593
94
CHARA.
INS.
CCD 1H DELAY
BYPASS
MUTE
PB/EE
TUNER
TUNER
MUTE
PB/EE
LINE
SCART
LINE
SCART
AGC
PR
R
Y
C
P
RPRP
Y. DELAY
Y/C
MIX
+
21
7978
AGC VXO
FBC
1/2
58 59
65
2928 44
17
12216
29128
SDA
SCL
69684643
67
84
62
70
D-REC-H
80
TP003
V-OUT
WF5
TP008
C-PB
WF6
MAIN CBA
TP002
RF-SW
WF1
14
X401
4.43MHz
17
Q703
JK701
V-IN
VIDEO OUT
TU001
20
BUFFER
BUFFER
Q401
TP010
GND
TO
TV BLOCK
VIDEO
TU-VIDEO
TO
TV BLOCK
C-VIDEO
JK703
V-IN
V-OUT
19
WF4
WF2
1-7-3
T6608BLA
Audio Block Diagram
REC
AMP
100
3
AUTO
BIAS
2
1
+5V
+5V
Q854
Q856
BIAS
OSC
Q855
Q853(PB=ON)
Q852(PB=ON)
Q851
SWITCHING
D-REC-OFF
5
EQ
AMP
98
7
LINE
AMP
REC-ON
TP007
AUDIO HD-SW
CONTROL
MUTE
11
6
PB-ON
SW CTL
SP/LP-ON
P
R
ALC
DET
ALC
IC401
(AUDIO SIGNAL PROCESS)
IC701 (SW)
13
17
3 A-PB/REC
CL402
4 A-COM
6 AE-H/FE-H
5 FE-H
AUDIO
HEAD
AUDIO
ERASE
HEAD
ACE HEAD ASSEMBLY
FE HEAD
1 FE-H
2 FE-H-GND
CL403
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
Mode : SP/REC
71
A-MUTE-H
SCL
SDA
TO
SERVO/SYSTEM
CONTROL BLOCK
TO SERVO
/SYSTEM
CONTROL
BLOCK
FULL
ERASE
HEAD
68 69
SERIAL
DECODER
(DECK ASSEMBLY)
12
16
INV
ATT
IC301
7
1
IC151 (AMP)
(VIDEO/AUDIO/CHROMA/DEFLECTION/IF)
SP2SP-GND 1
JK151
HEADPHONE JACK
SP151
SPEAKER
CN804
CL801
SP-MUTE
OUTPUT
AMP
50
52
53
54
MUTE
5
1
2155
3
4
12
14
6
2
1
AUDIO OUT
TU001
JK702
A-IN
JK703
SCART
LINE
SCART
LINE
A-IN
A-OUT
Q701
1011 9
SCART-H
EXT-L
SCART-MUTE
TUNER
TUNER
LINE
LINE
N-A-PB
ATT
AUDIO
MUTE
WF7
WF9
WF8
TO
SERVO/SYSTEM
CONTROL BLOCK
1-7-4
T6608BLT
TV Block Diagram
X301
4.43MHz
CL301A
CL302A
IC301 (VIDEO/AUDIO/CHROMA/DEFLECTION/IF)
IC201
(SYSTEM CONTROL/OSD)
V-SYNC
TEXT-L
OSD-R
OSD-G
OSD-B
OSD-BLK
H-SYNC
SLOW-SW
C-VIDEO
C-VIDEO
RAPID-SW
OSD-G
OSD-R
OSD-B
59
58
6062636482
TU-VIDEO
TO
VIDEO BLOCK
TO
CRT/H.V. BLOCK
CL301B
TO
CRT/H.V. BLOCK
CL302B
BLUE2
GREEN1
RED
SDA
SCL
TO
SERVO/SYSTEM
CONTROL BLOCK
TO
VIDEO
BLOCK
REC VIDEO SIGNAL PB VIDEO SIGNAL
Mode : SP/REC
WF18
WF17
WF10
WF11
CN303
(NO CONNECTION)
CN303 is used for
adjustment at factory
I
2
C-OPEN
3
FBP2
H-DRIVE1
ACL5
V-RAMP-FB4
V-DRIVE3
MAIN CBA
32
21
17
12
13
302820
27
11
10
143115
16
6
7
43
36
VIDEO
34
CHROMA
TRAP
SERIAL
I/F
INTELLIGENT
MONITORING
CHROMA
BPF
PAL
DECODER
SECAM
DECODER
BASE BAND
1H DELAY LINE
SYNC
SEPARATION
LUMA
SIGNAL
PROCESS
CIRCUIT
H-SYNC
PROCESS
CIRCUIT
V-SYNC
PROCESS
CIRCUIT
OSD MIX/RBG MATRIX/
BLANKING
TUNER
LINE/PB
TUNER
LINE/PB
CLOCK
CONTROL
CIRCUIT
SW CTL
IC703 (SW)
341 15
13
14
7
16811
15
56
616568
JK703
109 11
Q710
Q702
Q706
Q704
+5V
+5V
Q711
SLOW-SW-IN
RGB CONT
RAPID-SW-IN
INV
INT.MONITOR
1
I
2
C-OPEN 2
SDA 4
SCL 5
1-7-5
CRT/H.V. Block Diagram
T6608BLCRT
PUMP
UP
AMP
THERMAL
PROTECTION
3
6
7
1
5
810796
GREEN AMP
BLUE AMP
Q501
Q502
Q503
H.DRIVE
Q533
Q551
T552
V-
DRIVEH-DRIVE
L551
DEFLECTION-YOKE
IC551 (V-DEFLECTION CONTROL)
T551 F.B.T.
ANODE
FOCUS
SCREEN
CRT CBA
RGB
HEATER
ANODE
GND
V501
CRT
GND
FOCUS
SCREEN
JK501
HEATER 11
CN501
CL501BCL501A
REC VIDEO SIGNAL PB VIDEO SIGNAL
CN551
P-ON+160V 33
TO TV
BLOCK
CL302A
11
S
F
HV
FOCUS VR
SCREEN VR
+B
TO
POWER SUPPLY
BLOCK
DEF+B
H.OUTPUT
1
5
3
4
543
1
WF12
WF15WF14
WF16
WF13
RED AMP
Mode : SP/REC
CN502
2
VCC
321
CN301CL301B
TO TV
BLOCK
CL301A
JUNCTION-C
CBA
JUNCTION-B
CBA
CN552
CN302CL302B
H.V./POWER SUPPLY CBA
32RED
14GREEN
23BLUE
33V-DRIVE
11H-DRIVE
22FBP
55ACL
44V-RAMP-FB
3
125
4
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