1. 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.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.1.1. 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 the chassis, the reading should be between
1MΩ and 5.2MΩ.
When the exposed metal does not have a return path to
the chassis, the reading must be
Figure 1
.
1.1.2. 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 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF
capacitors, between each exposed metallic part on the set
and a good earth ground such as a water pipe, as shown in
Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt 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 volts
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 milliamp. In case a
measurement is outside of the limits specified, there is a
possibility of a shock hazard, and the equipment should be
repaired and rechecked before it is returned to the
customer.
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 and some field-effect transistorsand
semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static 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,
which should be removed 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 alminum
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 anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-p ropelled 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, alminum 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.
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 hamles s 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
todamage an ES device).
3 PRECAUTION OF LASER DIODE
4 SERVICE CAUTION BASED ON LEGAL RESTRICTIONS
4.1. General description about Lead Free Solder (PbF)
The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this
equipment in considering the globally environmental conservation.
The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin
The laser diode in the traverse unit (optical pickup) may brake down due to static electricity of clothes or human body. Use due
caution to electrostatic breakdown when servicing and handling the laser diode.
5.1. Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static
electricity in the working environment. Proceed servicing works under the working environment where grounding works is
completed.
5.1.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
5.1.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
5.1.3. Handling of optical pickup
1. To keep the good quality of the optical pickup maintenance parts during transportation and before installation, the both ends of
the laser diode are short-circuited. After replacing the parts with new ones, remove the short circuit according to the correct
procedure. (See this Technical Guide.)
2. Do not use a tester to check the laser diode for the optical pickup. Failure to do so will damage the laser diode due to the power
supply in the tester.
5.2. Handling Precautions for Traverse Unit (Optical Pickup)
1. Do not give a considerable shock to the traverse unit (optical pickup) as it has an extremely high-precise structure.
2. When replacing the optical pickup, install the flexible cable and cut its short land with a nipper. See the optical pickup
replacement procedure in this Technical Guide. Before replacing the traverse unit, remove the short pin for preventing static
electricity and install a new unit. Connect the connector as short times as possible.
3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the cable.
4. The half-fixed resistor for laser power adjustment cannot be adjusted. Do not turn the resistor.
1. Slide the lever (A) in the arrow direction (to the opposite
side) till it stops.
2. Slide the lever (A) further by bendin g the tab at the right
side of the lever A in the right direction. (The right groove
opens and the boss becomes seen.)
3. Open the lever (B) to left. (The 2 grooves at the left side
open.)
12
7.3. Tray
1. Slide the guide tray unit while pressing the stopper in the
arrow direction, and remove the guide tray unit.
7.6.1. Cautions to Be Taken in Handling the TRV Unit
The laser diode in the TRV unit may be damaged due to electrostatic discharge generating from clothes or human body. Use due
caution to electrostatic discharge damage when servicing the laser diode.
1. Do not give a considerable shock to the TRV unit as it has an extremely high-precise structure.
2. To prevent the laser diode from the electrostatic discharge damage, the Intermediate FFC of the TRV unit removed from the
PCB should be short-circuited with a short pin or a clip.
3. The Intermediate FFC may be cut off if an excessive force is applied to it. Use caution when handling the Intermediate FFC.
The optical pickup self-diagnosis function has been include d in this unit. When repairing, use the following procedure for effective
Self-diagnosis . Be sure to use the self-diagnosis function before replacing the TRV Unit when "NO DISC" is displayed. As a
guideline, you should replace the TRV Unit when the value of the laser drive current is more than 55.
Note:
Press the power button to turn on the power, and check the value within three minutes before the unit warms up. (Otherwise,
the result will be incorrect.)
The service modes can be activated by pressing various button combination on the player and remote control unit. please carry out
your operation based on the remote control supplied with Panasonic DVD player of previous models.
Player buttonsRemote control unit buttonsApplicationNote
PLAY
+
OPEN/CLOSE
0Displaying the UHF display F_ _ _Refer to section 8.3. Self-
5Jitter check, tilt adjustment
*Display shows J_xxx/yyy_ zz
"yyy" and "zz" shown to the right have nothing to do with the jitter
value. "yyy" is the error counter, while "zz" isthe focus drive
value.
6Checking the region numbers and broadcast system
7Checking the program versionCheck the IC8651 FLASH
9Lighting Confirmation Function of Display Tube
FUNCTIONChecking the laser drive currentRefer to section 8.1.
PAUSEWriting the laser drive current value after replacing the optical
pickup (do not use for anything other than optical pickup
replacement)
POWERInitializing the DVD player
(restoring factory preset settings)
Diagnosis Function (UHF
Display).
ROM program.
Optical Pickup
Replacement Procedure.
Refer to section 8.5.
Initializing the DVD
player.
SP motor current error, IC8251 errorTRV UnitIC8251
Firm version agreement check for factory preset
setting failure prevention
Initialize completion check for factory preset
setting failure prevention
LD MotorDV4.1
TRV Motor DV4.1
(IC8651)
FROM
(IC8651)
Note:
An error code will be canceled if a power supply is turned OFF.
*1: When FROM or Module P.C.B is replaced, be sure to write the present value into the player as the initial setting of laser drive
current . (Refer to section 8.5 initial setting of laser drive current .)
Writing method :
a. Press the "PAUSE" button on the remote control unit while pressing the "PLAY" and "OPEN/CLOSE" buttons on the player.
F0C0DVD : Cannot playback because it is not DVD Video The DVD-ROM/-R/-RW/+R/+RW is not
F0C1DVD : Prohibited by the restricted region codeThe region code of DVD is not right .POWER, OPEN/CLOSE
F0C2DVD : PAL restricted playbackWhen put the DVD-PAL disc into the NTSC only
F0C3DVD : Parental lock setting prohibits the playback of