Panasonic PT-FW100NTU Service Manual

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Panasonic PT-FW100NTU Service Manual Manual pdf 5 page image

1 Safety Precautions1.1. General Guidelines· For continued safety, no modification of any circuit must beattempted.· Unplug the power cord from the power outlet beforedisassembling this projector.· Use correctly the supplied power cord and must ground it.· It is advisable to use an isolation transformer in the ACpower line before the service.· Be careful not to touch the rotation part (cooling fan, etc.) ofthis projector when you service with the upper caseremoved and the power supply turned ON.· Observe the original lead dress during the service. If a shortcircuit is found, replace all the parts overheated ordamaged by the short circuit.· After the service, all the protective devices such asinsulation barriers, insulation papers, shields, and isolationR-C combinations must be properly installed.· After the service, check the leakage current to prevent thecustomer from getting an electric shock.1.2. Leakage Current Check1. Prepare the measuring circuit as shown in Fig.1.Be sure to use a voltmeter having the performancedescribed in Table 1.Fig. 1Table 1Fig. 22. Assemble the circuit as shown in Fig. 2. Plug the powercord in a power outlet.3. Connect M1 to T1 according to Fig. 2 and measure thevoltage.4. Change the connection of M1 from T1 to T2 and measurethe voltage again.5. The voltmeter must read 0.375 V or lower in both of steps3 and 4. This means that the current must be 0.75 mA orless.6. If the reading is out of the above standard, the projectormust be repaired and rechecked before returning to thecustomer because of a possibility of an electric shock.1.3. UV Precaution and UHM LampPrecautions· Be sure to unplug the power cord from the power outletwhen replacing the lamp.· Because the lamp reaches a very high temperature duringits operation, wait until it cools completely when replacingthe Lamp Unit.· The lamp emits small amounts of UV-radiation, avoid direct-eye contact with the light.· The lamp unit has high internal pressure. If improperlyhandled, explosion might result.· Because the high pressure lamp involves a risk of failure,never touch the lamp wire lead during the service. (See Fig.3)Fig.35PT-FW100NTU / PT-FW100NTE / PT-FW100NTEA