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Great manual, great price. Has a few of the basic operating instructions that most service manuals leave out. Complete instructions for disassembling board by board, safety precautions, schematics, complete parts list.
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I am very pleased with the service manual for my RT-909. This was an easy purchase and great procuct, and much cheaper than other venues i had looked at. This web site is now listed in my favorites list. KEEP UP THE GOOD WORK. THANKS. J. BROWN
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A very well written and easy to understand manual.
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There was no problem at all.After paying i had to wait only a few hours,than i could
download the manual in best pdf-quality.
Thank You !
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I found this service manual to be complete in every detail except for troubleshooting charts. It would be helpful if it had a set of troubleshooting charts; however it is a very good manual otherwise and for the price it is very well worth it.
SERVICE MANUAL
16PW36-2 Power board
16MB07 E3 Board Power Consumption Voltage Current mA Power Watts 11.7W +12V +5V +3V3 Voltage ---Power Watts 19W +12V +5V +3V3
The TOPSwitch concept is used for power supply. TOP 234Y (IC1) is designed to work until 50 Watts in family of TOPSwitch_FX with 5 pins. The receiver works between 85 and 265 VAC mains voltage by using TOP 234Y in SMPS (Switch Mode Power Supply). In SMPS applications, secondary voltage regulation is adjusted according to the feedback voltage from the secondary side of transformer. The feedback voltages are 3.3V and 5V. This is connected to the comparator pin of TOP 234Y (IC1-pin1) via IC2 (Optocoupler). The comparator pin also protects the box against short circuits and overload. The supply voltage of TOP233Y(IC1) is between 2V and 3V at pin2. The TOP 234Y works at a fixed frequency. This frequency is fixed by RC oscillator at pin1. Pin3 and pin4 are ground and pin5 is the drain of the MOSFET, which is inside the TOP 234Y. Due to changes in Vcc, TOP234Y adjusts the duty cycle of the square wave in drain pin and regulates the secondary side of the transformer. Vcc voltage which changes between 2V and 3V is also used to regulate and protect. Output voltages of the transformer (TR2): (i) (ii) (iii) (iv) 3.3V: 5100 IC (IC101),flash memory (IC 1), tuner and other components. 5V: Front panel board, Tuner , and some ICs and circuits. 12V: hard disk and some other ic and circuits -25V :flaman voltage
POWER_ON STAND_BY
Current mA
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