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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