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Very complete shop manual. It contains everything needed to troubleshoot bascially any problem. Instructions, diagrams, schmeatics, illustrations... it's all there. Highly recommended!
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Text excerpt from page 14 (click to view)
SH-FX65P / SH-FX65PC
8.1.2.1.
TX-TYPE A / RX-TYPE 1
Note:
RF
RF
- One way only - FX65/FX66 signal flow - FX65/FX66 only
ADC
MCU EEPROM
BB
BB
DAC
CH2 IN
TX Type A
CH2 OUT
RX Type 1
� Type A transmitter uses one ADC (Analog to Digital Converter) and transmits audio through Channel 2. Type 1 receiver (Rx) uses one DAC and output audio through Channel 2. The firmware (that is downloaded to EEPROM IC) multiplexes which channel to listen to (in this case Channel 2 since type A is transmitting from channel 2 In) by setting the baseband accordingly.
EEPROM MCU