Duraband t6609bk schematic
SERVICE MANUAL
Main Section
I Specifications
I Preparation for Servicing
I Adjustment Procedures
I Schematic Diagrams
I CBA’s
I Exploded Views
I Parts List
When servicing the deck
mechanism, refer to MK14 Deck
Mechanism Section.
Deck Mechanism Part No.:
N2326FT or N2526FT
14″ COLOR TV/VCR COMBINATION
T6609BK
PAL
MAIN SECTION
14″ COLOR TV/VCR COMBINATION
T6609BK
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
How to Initialize the TV/VCR Combination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1
Mechanical Trouble Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1
Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1
System Control Timing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1
IC Pin Function Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1
Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1
Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17-1
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18-1
SPECIFICATIONS
*ˆ Mode---------SP mode unless otherwise specified
* Test input terminal
<Except Tuner>--------Video input (1 Vp-p)
Audio input (-10 dB)
<Tuner>------------------Ant. input (80 dBµV) Video: 87.5% mod.(BG/DK), 80.0% mod.(I)
Audio: 30 kHz dev. (1 kHz Sin)
< DEFLECTION >
Description Condition Unit Nominal Limit
1. Over Scan --- % 90 85/95
2. Linearity
3. High Voltage --- kV 22 ---
Horizontal % --- ±15
Vertical % --- ±10
< VIDEO & CHROMA >
Description Condition Unit Nominal Limit
Center m/m --- 0.6
1. Misconvergence
2. Contrast Control Range --- dB --- 6
3. Brightness APL 100% ft-L 55 40
4. Color Temperature --- K 8500 ---
Corner m/m --- 2.0
Side m/m --- 1.5
< VCR >
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
4. Wow & Flutter (RMS) (R/P) % 0.25 0.5
AM(SP) (R/P) dB 38 33
PM(SP) (R/P) dB 36 33
< TUNER >
Description Condition Unit Nominal Limit
1. Video S/N --- dB 45 40
2. Audio S/N (W/LPF) --- dB 43 40
1-1-1 T6609SP
< AUDIO>
All items are measured across 8 Ω resistor at speaker output terminal.
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)
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.
200 Hz (R/P) dB --- 5.0/-10
6 kHz (R/P) dB --- 5.0/-10
<TV NORM, TUNER SENSIVITY, RECEPTIVE TV CHANNELS>
TV Norm Tuner Sensivity Receptive TV Channels
PA L -I
NOM: VHF 46dBµV / UHF 47dBµV
MAX: VHF 53dBµV / UHF 56dBµV
IRA - IRJ, gapC, E21 - E69, S01 - S03,
Z+1, Z+2, S1 - S41
1-1-2 T6609SP
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 instrument, including, but not limited to, the
following items:
a. Be sure that no built-in protective devices are
defective 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 operate 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
instrument completely reassembled, plug the
AC line cord directly into a 120 V AC outlet. (Do
not use an isolation transformer during this
test.) Use a leakage 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.
READING SHOULD
NOT BE ABOVE 0.5 mA
LEAKAGE
DEVICE
BEING
TESTED
TEST ALL EXPOSED
METAL SURFACES
ALSO TEST WITH
PLUG REVERSED
USING AC
ADAPTER PLUG
AS REQUIRED
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 servicing 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
CURRENT
TESTER
+
EARTH
GROUND
_
1-2-1 TVVCRP_ISP
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
connected 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.
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.
1-2-2 TVVCRP_ISP
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
producing parts (heat sinks, 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
droplets, 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
connectors, first, disconnect the AC plug from AC
supply socket.
1-2-3 TVVCRP_ISP
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
Chassis or Secondary Conductor
Primary Circuit Terminals
AC Line Voltage Clearance Distance (d), (d’)
220 to 240 V
Note: This table is unofficial and for reference only. Be
sure to confirm the precise values.
≥ 3 mm (d)
≥ 6 mm (d’)
2. Leakage Current Test
Confirm the specified (or lower) leakage current
between B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals,
antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.).
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.
dd'
Fig. 1
Exposed Accessible Part
Z
AC Voltmeter
(High Impedance)
Earth Ground
B
Power Cord Plug Prongs
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
2 kΩ RES. Connected in parallel
220 to 240 V
50 kΩ RES. Connected in parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
i ≤ 0.7 mA AC Peak
i ≤ 2 mA DC
i ≤ 0.7 mA AC Peak
i ≤ 2 mA DC
1-2-4 TVVCRP_ISP
One side of power cord
plug prongs (B) to:
RF or Antenna terminals
Fig. 2
A/V Input, Output
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is
indicated as shown.
Top View
Out
2. For other ICs, pin 1 and every fifth pin are
indicated as shown.
Pin 1
3. The 1st pin of every male connector is indicated as
shown.
Pin 1
Input
In
Bottom View
5
10
How to Read the Values of the
Rectangular Type Chip
Components
Example:
(a) Resistor
473
= 473 = 47 [kΩ]
(b) Capacitor
= Not shown
Caution:
Once chip parts (Resistors, Capacitors, Transistors,
etc.) are removed, they must not be reused. Always
use a new part.
(Top View)
(Top View)
Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect
the AC cord.
2. FFC (Flexible Foil Connector) cable should be
inserted parallel into the connector, not at an
angle.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Pb (Lead) Free Solder
Pb free mark will be found on PCBs which use 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.
Pb free mark
1-3-1 TVVCRP_SN
Replacement Procedures for
Leadless (Chip) Components
The Following Procedures are
Recommended for the Replacement of the
Leadless Components Used in this Unit.
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.
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.)
1-2. Standard solder
a. Soldering Iron
Use a pencil-type soldering iron (less than 30
watts).
b. Solder
Eutectic solder (Tin 63%, Lead 37%) is
recommended.
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.)
Chip
Soldering Iron
Tweezers
Tweezers
Soldering Iron
Solder
Note:
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.
Note:
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
Soldering Iron
Presolder
1-3-2 TVVCRP_SN
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
1. Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
Fig. S-1-1
2. Remove the flat pack-IC with tweezers while
applying 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
tweezers. (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)
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.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
Machine
Flat Pack-IC
Fig. S-1-2
With Soldering Iron:
1. Using desoldering braid, remove the solder from
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
Flat Pack-IC
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)
Fine Tip
Soldering Iron
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
tweezers. (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
tweezers. (Fig. S-1-6)
Note: When using a soldering iron, care must be
taken to ensure that the flat pack-IC is not
Desoldering Braid
Soldering Iron
Fig. S-1-3
Sharp
Pin
Fig. S-1-4
1-3-3 TVVCRP_SN
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
or
Iron Wire
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 “●” 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.
To Solid
Mounting Point
CBA
Tweezers
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Flat Pack-IC
Fig. S-1-6
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
Fig. S-1-7
CBA
Flat Pack-IC
Fig. S-1-8
1-3-4 TVVCRP_SN
Instructions for Handling Semiconductors
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 (1 MΩ) 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 (1 MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on
clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors
with your clothing.
<Incorrect>
<Correct>
1MΩ
CBA
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
1-3-5 TVVCRP_SN
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.
Key Adjustment Mode
Key Adjustment Mode
Head switching position adjustment
5
6 No need to use.
7 No need to use.
8
9
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.
(Manual adjustment): See adjustment
instructions page 1-6-7.
H. Shift adjustment: See adjustment
instructions page 1-6-4.
V. Size/V. Shift adjustment: See
adjustment instructions page 1-6-4.
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.
Q201
(END SENSOR)
Q202
(START SENSOR)
Picture adjustment mode: Press the
[MENU] button to change from BRT
(Bright), *CNT (Contrast), *COL (Color),
MENU
VOL-
0
1 No need to use.
2
3
4
*TNT(Tint) and SHP(SHARP). Press
[PROG+/PROG-] buttons to adjust
Initial Value.
*Marked items are not necessary to
adjust normally.
SECAM Black Level adjustment: See
adjustment instructions page 1-6-3.
Cut-off adjustment: See adjustment
instructions page 1-6-5.
White Balance adjustment: See
adjustment instructions page 1-6-5.
C-Trap adjustment: See adjustment
instructions page 1-6-3.
H adjustment mode: See adjustment
instructions page 1-6-2.
Head switching position adjustment
(Auto adjustment): See adjustment
instructions page 1-6-7.
Auto record mode: Perform recording
(15 Sec.)-->Stop-->Rewind (Zero
return) automatically.
SW211
(REC-SAFETY SW)
MAIN CBA
1-4-1 T6609PFS
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.
[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
2. Disassembly Method
Removal
Step/
Loc.
No.
[1]
[2]
[3] Power Unit
[4]
[5]
[6] Top Cover D3 5(S-4), *CL604 5
[7]
Part
Rear
Cabinet
Power Unit
and Tray
Chassis
Unit
Tr ay
Chassis
Unit
H.V./Power
Supply
CBA
Bottom
Plate
Remove/*Unhook/
Fig.
No.
D1
D2
D5
D3
D4
D5
D3D5*CN502, *CN552,
D3 ---------- ---
D3
D5
D3 (S-5) 6
Unlock/Release/
Unplug/Unclamp/
Desolder
4(S-1), 2(S-2),
*CN151
Anode Cap, *CN501,
*CN551, *CN601,
CRT CBA, Power
Knob
*CN602
6(S-3) 4
Note
1
2
3
Removal
Step/
Loc.
No.
[8] Deck Unit
[9] Main CBA
[10] CRT
↓
(1)
Note:
(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 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 the following “Reference Notes in the
Ta b le ” .
Part
↓
(2)
Remove/*Unhook/
Fig.
No.
D3
D5
D3
D5
D4
D5
(3)
Unlock/Release/
Unplug/Unclamp/
Desolder
7(S-6), (S-7), (S-8),
*Desolder (CN201,
CL401, CL402,
CL403)
4(S-9) 8
4(S-10) 9
↓
↓
(4)
Note
7
↓
(5)
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.
2. CAUTION!: Discharge the Anode Lead of the CRT
with the CRT Ground Wire before removing the
Anode Cap.
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.
1-5-1 T6609DC
5. Removal of the Top Cover.
Remove five screws (S-4) and CL604, and remove
the Top Cover.
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.
(S-2)
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)
[1] Rear Cabinet
(S-2)
(S-1)
(S-1)
(S-1)
[1] Rear Cabinet
Fig. D1
(S-2)
(S-1)
(S-2)
(S-1)
Fig. D2
1-5-2 T6609DC
(S-4)
(S-4)
[4] Tray
Chassis Unit
(S-4)
(S-6)
[8] Deck Unit
(S-9)
(S-7)
(S-6)
(S-9)
(S-4)
[6] Top Cover
(S-6)
(S-6)
(S-9)
[9] Main CBA
(S-8)
A
CL604
(S-9)
Power Button
(S-3)
[2] Power Unit and
Tray Chassis Unit
(S-3)
(S-3)
(S-5)
[5] H.V./Power
Supply CBA
[7] Bottom Plate
A
[3] Power Unit
Fig. D3
1-5-3 T6609DC
(S-10)
(S-10)
[10] CRT
Anode Cap
CRT CBA
(S-10)
(S-10)
Fig. D4
1-5-4 T6609DC
ANODE
CRT
GND
CRT CBA
CN501B
SCREEN
CN502
H.V./POWER SUPPLY CBA
CN552
CL501A
FOCUS
CN501
CN551
MAIN CBA
CN151
CN601
TO DEGAUSS
COIL
CL403
CL401
CL402
CN201
CN602
CL302A
CL301A
CL603A
TO SPEAKER
CYLINDER
ASSEMBLY
FE HEAD
CAPSTAN
ACE HEAD
ASSEMBLY
MOTOR
TO TOP COVER
DECK UNIT
CL604
1-5-5 T6609DC
Fig. D5
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: 0.001~50 V/Div,
F-Range: DC~AC-60 MHz
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 (0128) 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.
1-6-1 T6609EA
1. DC 105V (+B) Adjustment
2. H Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Test Point Adj. Point Mode Input
TP503(+B),
TP504(GND)
Tape M. E Q . Sp e c.
---
Note: TP503(+B), TP504(GND),
VR601 --- H.V./Power Supply CBA
1. Connect the unit to AC Power Outlet. (exact AC
230 V)
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±0.5 V DC.
VR601
DC Voltmeter,
Plastic Tip Driver
RF
(or Ext.)
+105±0.5 V DC
Color
Bar
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.
Test Point Adj. Point Mode Input
R590
Tape M. EQ. Spec.
--- Frequency Counter 15.625 kHz±250 Hz
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 15.625
kHz ± 250 Hz.
6. Turn the power off and on again.
[PROG+/PROG-]
buttons
Ext. ---
1-6-2 T6609EA
3. C-Trap Adjustment
4. SECAM Black Level 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.
Test Point Adj. Point Mode Input
J349F3
(B-OUT)
Tape M. EQ. Spec.
---
[PROG+/PROG-]
buttons
Oscilloscope,
Pattern Generator
Figure
RF
(or Ext.)
200 mVp-p Max.
Color Bar
minimum
Fig. 1
Note: J349F3(B-OIT) --- 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 (4.43
MHz) value becomes minimum on the
oscilloscope.
5. Turn the power off and on again.
Purpose: To set Black Level of the SECAM signal RY/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.
Test Point Adj. Point Mode Input
J361G4
Tape M. EQ. Spec.
---
Note: J361G4 --- Main CBA
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-] button 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.
[PROG+/PROG-]
buttons
Pattern Generator,
Analog Oscilloscope
(unusable Digital
Oscilloscope)
Ext.
SECAM
Gray
Scale
---
Y Signal
1H
Black REF. Level
1H
1H
5 mV/Div (10:1 Prove)
Fig. 2
1-6-3 T6609EA
5. V. Size Adjustment
7. H. Shift 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.
Test Point Adj. Point Mode Input
Screen
Tape M. EQ. Spec.
---
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.
[PROG+/PROG-]
buttons
Pattern
Generator
RF
(or Ext.)
Monoscope
90±5%
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.
Test Point Adj. Point Mode Input
Screen
Tape M. EQ. Spec.
---
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.
[PROG+/PROG-]
buttons
Pattern
Generator
RF
(or Ext.)
Monoscope
90±5%
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.
Test Point Adj. Point Mode Input
Screen
Tape M. EQ. Spec.
---
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.
[PROG+/PROG-]
buttons
Pattern
Generator
RF
(or Ext.)
Monoscope
90±5%
1-6-4 T6609EA
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