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FILE NO. 120-200171
SERVICE MANUAL
VIDEO CASSETTE RECORDER
W-512C
JUN, 2001
TOTAL CONTENTS
1. Precautions
2. Reference Information
3. Product Specifications
4. Disassembly and Reassembly
5. Alignment and Adjustment
6. Exploded View
7. Replacement Parts List
8. Block Diagram
9. PCB Diagram
10. Schematic Diagrams
1. Precautions
1. Be sure that all of the built-in protective devices are
replaced. Restore any missing protective shields. (READING SHOULD
NOT BE ABOVE
0.5mA)
LEAKAGE
2. When reinstalling the chassis and its assemblies, be DEVICE CURRENT
UNDER TESTER
sure to restore all pretective devices, including : TEST
control knobs and compartment covers.
TEST ALL
EXPOSED METER
3. Make sure that there are no cabinet openings SURFACES
through which people--particularly children 2-WIRE CORD
--might insert fingers and contact dangerous
voltages. Such openings include the spacing ALSO TEST WITH EARTH
PLUG REVERSED GROUND
between the picture tube and the cabinet mask, (USING AC ADAPTER
PLUG AS REQUIRED)
excessively wide cabinet ventilation slots, and
improperly fitted back covers.
Fig. 1-1 AC Leakage Test
If the measured resistance is less than 1.0 megohm
or greater than 5.2 megohms, an abnormality exists 7. Antenna Cold Check :
that must be corrected before the unit is returned With the unit's AC plug disconnected from the
to the customer. AC source, connect an electrical jumper across the
two AC prongs. Connect one lead of the ohmmeter
4. Leakage Current Hot Check (See Fig. 1-1) : to an AC prong.
Warning : Do not use an isolation transformer Connect the other lead to the coaxial connector.
during this test. Use a leakage current tester or a
metering system that complies with American 8. High Voltage Limit :
National Standards Institute (ANSI C101.1, High voltage must be measured each time
Leakage Current for Appliances), and Underwriters servicing is done on the B+, horizontal deflection
Laboratories (UL Publication UL1410, 59.7). or high voltage circuits.
5. With the unit completely reassembled, plug the AC Heed the high voltage limits. These include the
line cord directly the power outlet. With the unit's X-ray protection Specifications Label, and the
AC switch first in the ON position and then OFF, Product Safety and X-ray Warning Note on the
measure the current between a known erath service data schematic.
ground (metal water pipe, conduit, etc.) and all
exposed metal parts, including : antennas, handle 9. Some semiconductor ("solid state") devices are
brackets, metal cabinets, screwheads and control easily damaged by static electricity.
shafts. The current measured should not exceed Such components are called Electrostatically
0.5 milliamp. Reverse the power-plug prongs in the Sensitive Devices (ESDs); examples include
AC outlet and repeat the test. integrated circuits and some field-effect transistors.
The following techniques will reduce the
6. X-ray Limits : occurrence of component damage caused by static
The picture tube is designed to prohibit X-ray electricity.
emissions. To ensure continued X-ray protection,
replace the picture tube only with one that is the 10. Immediately before handling any semiconductor
same type as the original. components or assemblies, drain the electrostatic
charge from your body by touching a known
earth ground. Alternatively, wear a discharging
Wrist-strap device. (Be sure to remove it prior to
applying power--this is an electric shock
precaution.)
Toshiba 1-1
Precautions
11. High voltage is maintained within specified limits 18. Picture Tube Implosion Warning :
by close-tolerance, safety-related components and The picture tube in this receiver employs
adjustments. If the high voltage exceeds the "integral implosion" protection. To ensure
specified limits, check each of the special continued implosion protection, make sure that
components. the replacement picture tube is the same as the
original.
12. Design Alteration Warning :
Never alter or add to the mechanical or electrical 19. Do not remove, install or handle the picture tube
design of this unit. Example : Do not add without first putting on shatterproof goggles
auxiliary audio or video connectors. equipped with side shields. Never handle the
Such alterations might create a safety hazard. picture tube by its neck. Some "in-line" picture
Also, any design changes or additions will void tubes are equipped with a permanently attached
the manufacturer's warranty. deflection yoke; do not try to remove such
"permanently attached" yokes from the picture
13. Hot Chassis Warning : tube.
Some TV receiver chassis are electrically
connected directly to one conductor of the AC 20. Product Safety Notice :
power cord. If an isolation transformer is not Some electrical and mechanical parts have special
used, these units may be safely serviced only if safety-related characteristics which might not be
the AC power plug is inserted so that the chassis obvious from visual inspection. These safety
is connected to the ground side of the AC source. features and the protection they give might be
lost if the replacement component differs from the
To confirm that the AC power plug is inserted original--even if the replacement is rated for
correctly, do the following : Using an AC higher voltage, wattage, etc.
voltmeter, measure the voltage between the
chassis and a known earth ground. If the reading Components that are critical for safety are
is greater than 1.0V, remove the AC power plug, indicated in the circuit diagram by shading,
reverse its polarity and reinsert. Re-measure the ( or ).
voltage between the chassis and ground. Use replacement components that have the same
ratings, especially for flame resistance and
14. Some TV chassis are designed to operate with 85 dielectric strength specifications. A replacement
volts AC between chassis and ground, regardless part that does not have the same safety
of the AC plug polarity. These units can be safely characteristics as the original might create shock,
serviced only if an isolation transformer inserted fire or other hazards.
between the receiver and the power source.
15. Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of its
assemblies) unless all solid-state heat sinks are
correctly installed.
16. Always connect a test instrument's ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instrument's
ground lead last.
17. Observe the original lead dress, especially near
the following areas : Antenna wiring, sharp
edges, and especially the AC and high voltage
power supplies. Always inspect for pinched, out-
of-place, or frayed wiring. Do not change the
spacing between components and the printed
circuit board. Check the AC power cord for
damage. Make sure that leads and components
do not touch thermally hot parts.
1-2 Toshiba
Toshiba
INTRODUCTION
Identification of Controls
See the page in for details.
This manual shows the names of buttons in italics.
Front Panel VCR Display
EJECT
CHANNEL
Cassette compartment Cassette indicator
14 POWER 24 18
2-1 Operation of Controls
Timer recording indicator
INTRODUCTION
2. Reference Information
TIMER
VCR Hi-Fi Hi-Fi indicator
STOP
Remote 19 19
24 REW
Sensor VCR Display
REC 19 19
PLAY FF VCR indicator
Multifunctional
indicator
Remote Control
TV 29 14 POWER
Rear Panel
To operate your TV.
VCR TV POWER
To operate this VCR. VCR 14 19 CH/TRK
RF IN (FROM ANT.) terminal
Number buttons 17 1 2 3 LINE OUT AUDIO jacks (L, R)
A.SELECT 28 4 5 6 17 100 LINE IN 1 AUDIO jacks (L, R)
7 8 9
EJECT 18 A.SELECT
0 100 LINE LINE IN
14 ENTER OUT IN 1 (FROM ANT.)
R
AUDIO
REW * 19 VC-513
L
19 PLAY * OUT RF
VIDEO (TO TV)
EJECT CH
SLOW 21 3 4
PLAY 24 TV/VCR
DISPLAY 22 REW FF 19 FF *
ENTER
LINE IN 1 VIDEO jack
STOP 20 PAUSE/STILL To wall outlet LINE OUT VIDEO jack
SLOW PAUSE/STILL 22 COUNT RESET CH selector (3/4)
REMAIN/ COUNT
DISPLAY COUNTER RESET SP/ SLP
REMAIN/COUNTER 22 I.SELECT REC TIMER
24 SP/SLP
RF OUT (TO TV) terminal
24 TIMER
I.SELECT 24 TV VOL PROG. CANCEL
27 CANCEL
REC 24
14 PROG.
TV VOL 29 19 STOP *
LINE IN 1 AUDIO (Rear)
If the connected equipment is monaural (has one audio output jack), connect the L (MONO) side, the same
* These buttons are used to control the sound is recorded on both L and R on the Hi-Fi track.
cursor on the screen.
8 9
2-1
2-2
PREPARATION
PREPARATION
How to Use the Remote Control Connections
Before you use this VCR, it is necessary to connect it to your TV. Several ways of connecting are
This section explains how to get ready for remote control operation.
Reference Information
available depending on your use of TV or cable box. Select one which is applicable to your equipment.
Antenna/VCR/TV Connection
1 Disconnect the antenna cable from your TV and connect it to the RF IN terminal on the
Setting up the Remote Control VCR.
1 Open the battery compartment lid on the 2 Connect the RF OUT terminal to the TV.
rear panel. VHF/UHF VHF antenna
UHF antenna
combination antenna only
only
PREPARATION
IN
LINE LINE IN (FROM ANT.)
OUT IN 1 (FROM ANT.)
R
AUDIO
1
L
OUT RF
VIDEO (TO TV)
CH
3 4
Install 2 batteries ("AA" size) following OUT RF VHF/UHF
2 (TO TV)
the polarity diagrams. + 2
+
VHF UHF
Setting the VCR Output Channel Antenna splitter
When the VCR is connected in this way, the VCR sends the output (not supplied)
signals to channel 3 or 4 on your TV. Set the output channel
selector (CH selector) of the VCR to "3" or "4", whichever is vacant
in your area.
3 Close the battery compartment lid. AUDIO/VIDEO Connections
The AUDIO/VIDEO jacks are also available to connect your TV.
When connected your TV using the
LINE LINE IN
AUDIO/VIDEO OUT jacks
OUT IN 1 (FROM ANT.)
R
AUDIO
L
OUT RF
To watch video pictures, set the video input mode
VIDEO (TO TV)
CH
3 4
on your TV. For the video input mode, refer to the
manual of your TV.
LINE OUT VIDEO VIDEO IN
4 Point the remote control at the VCR and press the buttons within the operating range.
Distance: within about 7 m from the front of the remote sensor
LINE OUT AUDIO AUDIO IN
Angles: within about 30