This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
Text excerpt from page 1 (click to view)
Air Cleaner HR 4340/A
Philips Domestic Appliances and Personal Care
Service Manual 4822 729 21616 herewith cancells. PRODUCT INFORMATION GENERAL The HR 4340 is suitable for rooms / areas with a floor surface of up to approx. 40 m2. The air cleaner cleans the air effectively by catching 90% of the gases and 95% of the particles produced by smoking. This is done by 3 filters : Foam pre-filter : The foam pre - filter catches the larger dust particles floating in the air such as fluff and hairs. FEATURES Filter full indicator: Indicates that the filter has to be replaced. This has to be done when the white part of the indicator has turned pink like the other (pink) half. Speed control: With 3 speed settings. Safety lock: Prevents the customer from opening the front cover whilst the air cleaner is switched on. The front cover can only be opened, if the switch has been set to the �0" position. Overheating safety device: The overheating safety device comes into operation when the motor becomes too hot. To indicate that the appliance is still in �ON� position and connected to the mains, the pilot light remains on. If this happens : � Switch off the motor. � After approx. 15 min. the air cleaner can be switched on again.
HEPA filter HR4940 : This filter takes out all smaller airborne particles. Carbon filter : The carbon filter with activated carbon granulates (HR4941) effectively absorbes the smoke gases.
Product meets the requirements regarding interference suppression on radio and T.V.
