Service Manuals, User Guides, Schematic Diagrams or docs for : Philips Symptom Cure 2001-02 SymptomCure references Pa98-05

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For internal use only                                                                PHILIPS

                                                                      ISSUE PA98.05 (98-08-31)
Published by:
Service Department Portable Audio

                   LINE OF BUSINESS PORTABLE AUDIO

      SERVICE NEWSLETTER
05.01 TYPENUMBER(S): AJ3940

      INFORMATION     : Correction to the Electrical Partslist:
                        The Service codenumber of the Voltage Selector for /01 version
                        should read 4822 272 10366.

      REMARKS         :


05.02 TYPENUMBER(S): AZ1412, AZ1518

      SYMPTOM         :     IRIS CODE 6 5 7 5
                          After switching the set ON, the "POP" indicator is activated, but there
                          is no "POP" sound effect.

      CURE            : The problem is caused by a software bug.
                        There are two solutions available:

                          Short term (service) solution:
                          Add a transistor BC557C (4822 130 42231) and a resistor 4.7k
                          (4822 116 52283). Connect the collector (C) of BC557B to the
                          junction of 3512 and 3475, the emitter (E) to +M and the base (B) via
                          a 4.7k resistor to junction of 3464 and 3465.
                          For details on this rework, see circuit and layout diagram below.

                          Long term solution:
                          Replace microprocessor IC 7400 by 4822 209 17228.

      REMARKS         : Short term solution has been implemented in production from week
                        9830 onwards. New microprocessors will be used from week 9842
                        onwards.




                                Service Newsletter 1998 

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