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Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
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I have this hi-fi system for a long time and I need to repair some things. Founding this manual will be very helpfull :)
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It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
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Very fast service, best quality of the service manual and the schematics
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This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
Powered Subwoofer
HPS-250
CONTROLS AND THEIR FUNCTION
1. Gain - This knob controls the volume status of the subwoofer. 2. Phase - The phase switch is used to adjust the relative polarity of the subwoofer. When the phase switch is up, the phase is normal - when the switch is depressed, the subwoofer is 180 degrees out of phase. 3. Crossover Frequency - The crossover frequency knob determines the highest frequency your subwoofer will reproduce. It allows a seamless transition from the subwoofer to the satellite speakers. 4. LED - This LED turns green when the HPS250 is receiving power (is turned on) and is receiving a signal. 5. Main - This button is the master power switch.
6. Low Level Input - These left and right Line Level Inputs are normally used when the receiver/ processor has line-level �pre-amp out � or �subwoofer out� jacks. If a single cable mono or subwoofer source is connected to the HPS250, a Y-cable must be connected to the subwoofer for full output. 7. Fuse - Use only same type of fuses. Use a 2A 250v MDL Slo-Blo fuse for the 120v model, and a 1A 250v MDL Slo-Blo fuse for the 230v model. 8. AC Plug - Plug in the AC line cord in here. 9. High Level Inputs - These High Level Inputs are for receivers that do not have line-level �pre-amp out� or �subwoofer out� jacks. When a pair of main or satellite speakers are attached to the OUTPUT terminals, they are driven the full range of frequencies as generated by the music source (receiver, amplifier, etc.)
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