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                                            CONFIDENTIAL                                                 CSV-1
Sony Service Company
National Technical Services                 Service Bulletin
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656                TV Products

Model:          VPL-W400Q                                                           No.      458
Subject: Firmware-Special ROM For Lamp Timer Reset                                  Date: January 28, 2000


Symptom:
 (177X)                  The projector will not operate if the Status is set to OFF, and the following message
                         appears: Please replace the Lamp. Possible damage with continued use! Even if the
                         lamp is replaced, the lamp TIMER RESET command will be invalid, and power on
                         may fail.



Solution:                A special ROM is now available to reset the lamp timer regardless of the STATUS
                         ON/OFF state.

                         The lamp timer is reset to 0h. (The value is not copied into the previous lamp
                         timer.) To use this special ROM, perform the following procedure.

Parts Required:

                                      Description                              Part Number

                                  Lamp Timer Reset                             VW400QLTR
                                     IC M27C512
                                  (Check sum 061D)




Procedure -Using The Special ROM:

                    1.         Turn OFF the main power switch.
                    2.         Remove the Main ROM (IC5205) from its socket, and insert the special
                               ROM into socket.
CAUTION:
                    Programmable devices are easily damaged by static electricity. Make sure the equipment is
                    powered OFF and you are grounded to the unit with a cable that contains a 1 Meg Ohm
                    resistor between you and ground when installing programmable devices. Work with caution
                    when grounded to the unit.

                    3.         Turn ON the Main power switch.
                    4.         Leave the projector in STANDBY mode for at least 10 seconds.
                    5.         Turn OFF the Main power switch.
                    6.         Remove the special ROM, and install the main ROM back into its socket.
                    7.         Turn ON the Main power switch.

Note:                          Power ON will fail if the special ROM is left in the Main ROM socket.


Reference: SB B&P 1999-216                                                                             PRINTED IN USA

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