Page 1: ...4225 STEREO TUNER...
Page 2: ...frontend SPECIFICATION 20 5V 0 5V Tune to 87 5 MHz and read voltage repeat step 2 and 3 if incorrect SPECIFICATION 3V 0 5V B RF ADJUSTMENT TRACKING 1 Lon Connect RF generator to antenna input and dete...
Page 3: ...L 1 Disconnect detector probe and connect tape rec outputs to VIVM s oscilloscope and distortion analyzer 2 Switch stereo generator to 1 KHz 100 75 KHz mono modulation and oscilloscope to normal inter...
Page 4: ...etween P14 and ground A OSC ADJUSTMENT 1 Tune unit to show 600 kHz on display and adjust L102 to read 1 75V 0 05V on DMM Adjust L101 for maximum output 2 Tune unit to show 1400 KHz on display and adju...
Page 5: ...IF AM TRACKING ADJ L2 RF1 L4 RF2 LS MIX AM_OSC ADJ L8 OSC AM IF ADJ FM DET PRIMARY FM DET SECONDARY AM LED SENS ADJ FM MPX FILTER ADJ FM AUTO SEARCH FM MPX FILTER ADJ STEREO SEPARATION SYNTHESIZER FRE...
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