Panasonic PV-V4524S User manual

ORDER NO. MKE0401001C1
B3
Video Cassette Recorder
PV-V4524S / PV-V4624S / PV-V464S / PV-V4524S-K / PV-454S-K /
PV-V4624S-K
For servicing the R4-Mechanism Chassis for PV-Model, Please refer to
the R4-Mechanism Chassis for PV-Model Service Manual (Order No.
MKE0401000C1).
SPECIFICATIONS
2004 Matsushita Kotobuki Electronics Industries Ltd. All rights
reserved. Unauthorized copying and distribution is a violation of law.
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1. SAFETY PRECAUTIONS
GENERAL GUIDELINES
1. IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are
important for safety. These parts are marked by in the Schematic
Diagrams, Circuit Board Layout, Exploded Views and Replacement
Parts List. It is essential that these criticalparts should be replaced
with manufacturerís specified parts to prevent shock, fire or other
hazards. Do not modify the original design without permission of
manufacturer.
2. An Isolation Transformer should always be used during the servicing
of VCR whose chassis is not isolated from the AC power line. Use a
transformer of adequate power rating as this protects the technician
from accidents resulting in personalinjury from electrical shocks. It
will also protect VCR from being damaged by accidental shorting that
may occur during servicing.
3. When servicing, observe the original lead dress. If a short circuit is
found, replace all parts which have been overheated or damaged by
the short circuit.
4. After servicing, see to it that all the protective devices such as
insulation barriers, insulation papers shields are properly installed.
5. After servicing, make the following leakage current checks to prevent
the customer from being exposed to shock hazards.
LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on
the plug.
2. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metallic cabinet part on the
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equipment such as screwheads, connectors, control shafts, etc. When
the exposed metallic part has a return path to thechassis, the reading
should be between 1 M and 5.2 M . When the exposed metal does
not have a return path to the chassis, the reading must be infinity.
LEAKAGE CURRENT HOT CHECK / (See figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation
transformer for this check.
2. Connect a 1.5 k , 10 W resistor, in parallel with a 0.15 F capacitor,
between each exposed metallic part on the set and a good earth
ground, as shown in figure 1.
3. Use an AC voltmeter, with 1 k /V or more sensitivity, to measure the
potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each
point.
5. Reverse the AC plug in the AC outlet and repeat each of the above
measurements.
6. The potential at any point should not exceed 0.75 V RMS.
A leakage current tester (Simpson Model 229 or equivalent) may be
used to make the hot checks. Leakage current must not exceed 1/2
mA. In case a measurement is outside of the limits specified, there is a
possibility of a shock hazard, andthe equipment should be repaired
and rechecked before it is returned to the customer.
Figure 1
2. PREVENTION OF ELECTRO-STATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
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Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits, some field-effect transistorsand semiconductor "chip" components.
The following techniques should be used to help reduce the incidence of component damage caused
by electrostatic discharge (ESD).
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any ESD on your body by
touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging ESD wrist strap, whichshould
remove electrostatic charge for potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place
the assembly on a conductive surface such as aluminum foil, to
prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an antistatic solder removal device. Some solder removal
devices not classified as "antistatic (ESD protected)" can generate
electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical
charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package
until immediately before you are ready to install it. (Most replacement
ES devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparableconductive material).
7. Immediately before removing the protective material from the leads of
a replacement ES device, touch the protective material to the chassis
or circuit assembly into which the device will be installed.
CAUTION:
Be sure no power is applied to the chassis or circuit, and observe all
other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES
devices. (Otherwise harmless motion such as the brushing together of
your clothes fabric or the lifting of your foot from a carpeted floor can
generate static electricity (ESD)sufficient to damage an ES device).
“NOTE toCATV system installer:
This reminder is provided to call the CATV system installerís attention to Article 820-40 of the NEC
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that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall
be connected to the grounding systemof the building, as close to the point of cable entry as
practical.”
3. ABOUT LEAD FREE SOLDER (PbF)
Distinction of PbF PCB:
PCBs (manufactured) using lead free solder will have a PbF stamp or printing on the PCB.
(Please refer to figures.)
CAUTION:
- Pb free solder has a higher melting point than standard solder;
Typically the melting point is 50°F - 70°F (30°C - 40°C) higher.
Please use a soldering iron with temperature control and adjust it to
700°F ± 20°F (370°C ± 10°C).
In case of using high temperature soldering iron, please be carefull not
to heat too long.
- Pb free solder will tend to splash when heated too high (about 1100°F/
600°C).
- All products with the printed circuit board with PbF stamp or printing
must be serviced with lead free solder.
When soldering or unsoldering, completely remove all of the solder
from the pins or solder area, and be sure to heat the soldering points
with the lead free solder until it melts sufficiently.
Recommendations
Recommended lead free solder composition is Sn96.5 Ag3.0 Cu0.5.
4. SERVICE NOTES (PLEASE READ)
4.1. SELF-DIAGNOSIS INDICATION DISPLAY
This VCR has a self-diagnosis and display function.
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1. Press CH DOWN Button on VCR for over 3 seconds in Power off
condition, or keep pressing CH DOWN button on VCR in Shut off
condition.
Fig. 1-1
2. Fault code (4-digit number) will be displayed in F.I.P. as shown.
Fig. 1-2
4.1.1. Explanation of I 2 C bus transmission number
The condition of I2C bus transmission befor shut off is displayed.
Fig. 1-3
4.1.2. Explanation of VCR mode code number
The condition of VCR Mode before shut off is displayed.
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Fig. 1-4
4.1.3. Explanation of Error code number
The detecting condition and movement of mechanism is displayed.
Fig. 1-5
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4.1.3.1. Reason of Ejection
When an error code is 80, the reason of ejection is displayed on the Light Emitting Diode (LED)
display of “TIMER”, “VCR” and “HiFi”.
Fig. 1-6
Fig. 1-7
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4.1.4. Memory and Clear of Fault Code
- Error code is memorized on EEPROM (IC6004) (latest Error code only).
- Error code is cleared by power on operation after a self-diagnostic
display or Memory all clear.
4.2. SERVICE NOTES
4.2.1. USAGE SCREEN MODE
Function displayed on the TV monitor:
- the total elapsed “Cylinder rotation” time (in hours)
1. With power turned on and no cassette, press CH DOWN button on
VCR and 7 key on remote controller together.
(The USAGE SCREEN will be displayed on the TV Monitor.)
Fig. 2
Note:
1. After replacing the Cylinder Unit, press COUNTER RESET button on
remote controller in this mode. Total elapsed “Cylinder rotation” time
(in hours) will be cleared to 0.
2. To release from Usage Screen Mode, press any operation button on
remote controller or insert a cassette tape in this mode. The VCR will
return to normal operation mode.
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4.2.2. EEPROM IC (IC6004), MAIN C.B.A. REPLACEMENT NOTE
After replacing EEPROM IC (IC6004) or Main C.B.A., be sure to perform the "PG SHIFTER
ADJUSTMENT".
NOTE:
Refer to Service Manual for R4-Mechanism Chassis for PV-Model (Order No. MKE0401000C1).
4.2.3. SERVICE POSITION
4.2.3.1. Service Position
CAUTION:
HOT CIRCUIT (Primary circuit) exists on the Main C.B.A. Use extreme
care to prevent accidental shock when servicing.
NOTE:
When carring out loading of the cassette tape, if light is strong, a tape may not carry out loading.
Please shade a Mechanism Unit top or weaken lighting.
4.2.3.1.1. Service Position (1)
Fig. 3-1
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4.2.3.1.2. Service Position (2)
Turn on the power and insert the Cassette tape.
Fig. 3-2-1
After disconnecting the AC cord, turn over the Main C.B.A. and Mechanism Chassis together.
Fig. 3-2-2
4.2.4. HOT CIRCUIT
Primary circuit exists on the Main C.B.A.
This circuit is identified as “ HOT” on the C.B.A. and in the Service Manual. Use extreme care to
prevent accidental shock when servicing.
4.2.5. TRACKING CENTER MODE (TRACKING FIX AT CENTER)
Insert the Cassette tape. Set the unit into Service Mode. Press CH UP button and CH DOWN button on
VCR together in Play back mode. “TRACKING CENTER” will be displayed on the TV monitor.
In this mode, the tracking is fixed at center. (Auto tracking and manual tracking functions are not
operational.)
Fig. 4-1
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To release from this mode, press CH UP button and CH DOWN button on VCR together again.
4.2.6. HOW TO RESET ALL VCR MEMORY FUNCTIONS
To reset (clear) the select language, channel auto set and set clock functions to their initial power on
condition (power on, no cassette inserted), hold down the PLAY and CH UP buttons on the unit
together for more than 5 seconds.
Power will shut off.
4.2.7. HOW TO CONFIRM AUTO CLOCK SET FEATURE
1. Connect an RF cable from the output of one unit to the input of the
test unit.
2. Select corresponding RF channels.
3. Playback a recording of P.B.S. channel including clock set data and
confirm this feature.
4.2.8. VARIABLE VOLTAGE ISOLATION TRANSFORMER
An Isolation Transformer should always be used during the servicing of VCR whose chassis is not
isolated from the AC power line. Use a transformer of adequate power rating as this protects the
technician from accidents resulting in personal injury fromelectrical shocks. It will also protect VCR
from being damaged by accidental shorting that may occur during servicing.
Also, when troubleshooting the above type of Power Supply Circuit, a variable isolation transformer is
required in order to increase the input voltage slowly.
4.2.9. SPECIAL NOTE
All integrated circuits and many other semiconductor devices are electrostatically sensitive and
therefore require the special handling techniques described under the “ELECTROSTATICALLY
SENSITIVE (ES) DEVICES” section of this service manual.
4.2.10. MODEL NO. IDENTIFICATION MARK
Use Marks shown in the chart below to distinguish the different models included in this Service
Manual.
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Note:
Refer to Item 3 of Schematic Diagram Notes of Schematic Diagram Notes, for mark “PT.”
5. DISASSEMBLY / ASSEMBLY PROCEDURES
5.1. CABINET SECTION
5.1.1. Disassembly Method
NOTE:
When reassembling, use the reverse steps.
CAUTION:
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Disconnect AC plug before disassembly or assembly.
5.1.1.1. Notes in chart
1. Installation of Top Cover
Install the Top Cover front portion at a downward angle so that the tab
on the Front Panel Assíy fits into the hole in the Top Cover.
Then, lower the rear portion into place and tighten 2 Screws (447).
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2. Installation of Front Panel Ass’y
CAUTION:
Opener Lever may be damaged when Front Panel Ass’y is installed,
with Cassette Door-Lid of Front Panel Ass’y and Opener Lever of
Cassette Up Ass’y set incorrectly.
1. When installing the Front Panel Ass’y, swing the Cassette Door-Lid all
the way open until the Cassette Door tab clears the Opener Lever.
2. Make sure that all locking tabs are aligned properly.
Then, press the Front Panel straight in.
Fig. D1
3. Installation of Mechanism Chassis and Cassette Up Ass’y onto Main
C.B.A.
A. Make sure the Mode Select SW. on the Main C.B.A. is in EJECT
position. If not, rotate the Mode Select SW. until the alignment
projection is in the EJECT Position.
Fig. D2
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B. Make sure the phase hole of the Main Cam Gear on the bottom side
of Mechanism Unit is in EJECT position.
Fig. D3
C. Install the Mechanism Chassis straight onto the Main C.B.A. so that
the Sensor LED clears the hole in the Mechanism Chassis and that 3
Connectors (P3501, P4001, P6201) are aligned and seated securely.
5.2. MECHANISM SECTION
Refer to the Service Manual for R4-Mechanism Chassis for PV-Model (Order No. MKE0401000C1).
6. SCHEMATIC DIAGRAMS
6.1. SCHEMATIC DIAGRAM & CIRCUIT BOARD LAYOUT NOTES
6.2. MAIN SCHEMATIC DIAGRAMS
6.3. INTERCONNECTION SCHEMATIC DIAGRAM
6.4. VOLTAGE CHART
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6.5. SIGNAL WAVEFORMS
7. CIRCUIT BOARD LAYOUT
7.1. MAIN C. B. A.
8. BLOCK DIAGRAMS
8.1. OVERALL BLOCK DIAGRAM
9. EXPLODED VIEWS
9.1. MECHANISM SECTION
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9.2. CHASSIS FRAME AND CASING PARTS SECTION
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9.3. PACKING PARTS AND ACCESSORIES SECTION
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10. REPLACEMENT PARTS LISTS
BEFORE REPLACING PARTS, READ THE FOLLOWING:
10.1. REPLACEMENT NOTES
10.1.1. General Notes
1. Use only original replacement parts:
To maintain original function and reliability of repaired units, use only
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