Used ICs: M52003AFP – NJM20730 – NJM2904 – TA7370 – TA8805F – AN5707NS – CX20159
Power
supply voltage is +9V DC.
Voltage adjustment
Connect a digital multitester between TP605 (+4.8V) and TP602 (Gnd) on the main board and then adjust RV601, so that the reading of the votage is +4.5V +/-0.05V.
Connect the multitester between TP606 (-8V) and TP602(Gnd), and then adjust RV602 so that the reading of the voltage is +4.2 +/- 0.05V.
Connect the digital multimeter between TP607 (+4.2V) and TP602 (Gnd), and then adjust RV603, so that the reading of voltage is +4.2 +/- 0.05V.
Schematic (Tuner & Main board)
Disassemble procedure
Click on the pictures to magnify
