Panasonic DoubleFeature PV-D4734S User manual

ORDER NO. MKE0403002C1
B3
DVD / VCR DECK
PV-D4734S / PV-D4744 / PV-D4744S / PV-D4754S / PV-D4734S-K
/ PV-D4744S-K / PV-D4754S-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
1

2

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 DVD 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 DVD 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
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.
3

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
1.1. LASER PRODUCT
CLASS I LASER PRODUCT
- This equipment is certified to comply with DHHS Rules 21 CFR Chapter
1, Subchapter J in effect as of date of manufacture. (Only for U.S.A.)
This equipment is classified as a Class I (Class 1) level LASER Product and there is no hazardous
LASER radiation with the safety protection.
Caution:
4

Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.
Danger:
The serviceman should not remove the cover of drive unit and should not service because the drive
unit is a nonserviceable parts. Please check that the labels.
Never touch the internal parts in order to avoid EXPOSURE TO VISIBLE LASER RADIATION.
Unplug the AC power cord to the equipment when opening the top cover.
When the power switch is On, do not place your eyes close to the front panel opening door or the
other openings to look into the interior unit.
LASER Specification
Class I level A LASER Product (Class 1 level A LASER Product)
Wave Length: 647 - 677 nm (at DVD)
775 - 815 nm (at CD)
Laser Power: No hazardous radiation is emitted with the safety protection.
1.2. PRECAUTION OF LASER DIODE
CAUTION:
This unit utilizes a class III a laser. Visible laser radiation is emitted from
the optical pickup lens when the unit is turned on:
1. Do not look directly into the pickup lens.
2. Do not use optical instruments to look at the pickup lens.
3. Do not adjust the preset variable resistor on the optical pickup.
4. Do not disassemble the optical pickup unit.
5. If the optical pickup is replaced, use the manufactures specified
replacement pickup only.
6. Use of control or adjustment or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
2. PREVENTION OF ELECTRO-STATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
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
5

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
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 printing on the PCB.
6

(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 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.
7

4. SERVICE NOTES (PLEASE READ)
4.1. SELF-DIAGNOSIS INDICATION DISPLAY
This VCR has a self-diagnosis and display function.
1. Keep pressing 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
8

4.1.2. Explanation of VCR mode code number
The condition of VCR Mode before shut off is displayed.
Fig. 1-4
4.1.3. Explanation of Error code number
The detecting condition and movement of mechanism is displayed.
Fig. 1-5
9

4.1.3.1. Reason of Ejection
When an error code is 80, the reason of ejection is displayed on the F.I.P. of “TIMER”, “VCR” and
“HiFi”.
Fig. 1-6
Note:
The location of above indications is different for each type of F.I.P..
10

Fig. 1-7
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. DVD SERVICE MODE
4.2.1.1. How to enter DVD Service Mode
1. Connect a TV Monitor.
2. Set the unit to DVD mode.
3. Press STOP/EJECT button on the VCR and 9 key on the remote
controller together with no cassette inserted.
The unit will enter the DVD Service Mode.
Fig. 2-1-1
4. To confirm the value of JITTER and the value of LASER (current),
insert the DVD Test Disc into the DVD Unit.
5. To release from this mode, turn off the power.
4.2.1.2. Troubleshooting hint (standard) for this mode
It can be determine if the DVD Mechanism Unit is defective by checking the value of JITTER and the
11

value of LASER (current).
Fig. 2-1-2
4.2.2. USAGE SCREEN MODE
Function displayed on the TV monitor:
- the total elapsed “Cylinder rotation” time (in hours)
- the total elapsed “DVD Play” 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. 2-2
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. After replacing the DVD Mechanism Unit, press ADD/DLT button on
remote controller in this mode. Total elapsed “DVD Play” time (in
hours) will be cleared to 0.
3. To release from Usage Screen Mode, press any operation button on
12

remote controller or insert a cassette tape in this mode. The VCR will
return to normal operation mode.
4.2.3. 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).
4.2.4. GROUNDING FOR ELECTROSTATIC BREAKDOWN
Prevention
1. Human body grounding
Use the antistatic wrist strap to discharge the static electricity from
your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the
optical pickup is placed and ground the sheet.
Caution:
The static electricity of your clothes will not be groundedthrough the
wrist strap. So take care not to let your clothestouch the optical pickup.
Fig. 2-3
4.2.5. METHOD FOR EJECTING THE DVD TRAY MANUALLY
1. Insert a Screwdriver or similar object into the Eject hole.
2. Press it gently, and then pull the Tray fully out.
Fig. 2-4
13

4.2.6. SERVICE POSITION
4.2.6.1. 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.
4.2.6.1.1. Service Position (1)
Fig. 3-1
14

4.2.6.1.2. 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
15

4.2.6.1.3. Service Position (3)
In Service Position (3), the DVD Main C.B.A. without Extension Cables can be performed.
Turn on the power and playback the disc.
Fig. 3-3
CAUTION:
Confirm the Insulation Sheet between Main C.B.A. and DVD Main C.B.A.
befor connecting AC cord.
4.2.7. 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.
4.2.8. 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
16

To release from this mode, press CH UP button and CH DOWN button on VCR together again.
4.2.9. 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.
4.2.10. 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.
4.2.11. VARIABLE VOLTAGE ISOLATION TRANSFORMER
An Isolation Transformer should always be used during the servicing of DVD 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 injuryfrom electrical shocks. It will also protect DVD
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.
4.2.12. 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.
4.2.13. MODEL NO. IDENTIFICATION MARK
Use Marks shown in the chart below to distinguish the different models included in this Service
Manual.
17

Note:
Refer to Item 3 of Schematic Diagram Notes of Schematic Diagram Notes, for mark “PT.”
5. DISASSEMBLY / ASSEMBLY PROCEDURES
5.1. CABINET SECTION
Note:
Some parts have been changed on running change basis. Therefore, disassembly and assembly
methods are slightly different between early products and later products. Please refer to “11 PARTS
CHANGE INFORMATION”.
5.1.1. Disassembly Flowchart
Perform disassembly procedures in the order described in the “Disassembly Flowchart” Shown
below. When reassembling, use the reverse procedure.
Fig. C1
18

CAUTION:
Disconnect AC plug before disassembly or assembly.
Fig. C2
19

5.1.1.1. Notes in chart (Cabinet Section)
1. Removal of Top Cover
When removing the Top Cover, slide it as indicated by the arrow.
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
20