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For internal use only PHILIPS
ISSUE PA97.06 (97-11-26)
Published by:
Service Department LOBPA Hong Kong
LINE OF BUSINESS PORTABLE AUDIO
SERVICE NEWSLETTER
06.01 TYPENUMBER(S): AE3350
SYMPTOM : Batteries run out quickly.
CURE : A transistor (Q7) and a resistor 1k (R17) were added since week
9636 to protect the audio IC from wrong polarity of external DC
supply.
The grounding end of R17 is wrongly connected to the ground before
the power switch, so that a current of 2.5mA is drawn in the power
"OFF" condition.
To solve the problem, remove R17 and connect a 1k resistor from
the base of Q7 to the negative (-) of C43.
REMARKS : Modification has been implemented in production from week 9745
onwards.
06.02 TYPENUMBER(S): AW7150, AW7250
INFORMATION : For AW7150/11P and AW7250/11P only:
The tuning capacitor 2101 was replaced by 4822 125 11104.
To obtain optimum alignment, following components were changed to:
2116 5322 122 34107 3.9pF