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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