audiomaniac2
Active Member
I'm working on a NAD 7140 that has a defective tuner. Unfortunatly I hav'nt found a schematic with voltages listed on it. The tuner will scan but never pick up a station. Test point 102 voltage never changes as it scans stations. Dual op amp (feeds tp- 102)
ic112 (upc4558) has the following voltages on it's pins.All voltages a positive to chassis ground.
1- 1.31 volts
2-4.99
3-3.07
4-0
5-3.07
6-5
7-1.3
8-34
The big tc9147p chip drives this chip. Any Ideas?
ic112 (upc4558) has the following voltages on it's pins.All voltages a positive to chassis ground.
1- 1.31 volts
2-4.99
3-3.07
4-0
5-3.07
6-5
7-1.3
8-34
The big tc9147p chip drives this chip. Any Ideas?