688
New member
Nothing new so far, i have not received the replacement card yet.
I got a little starting point on another board.
"Its sounds like you have a fault on that card, So its a case of inputing a signal, say 1khz and following it through from start to finish.
Record a 1khz signal onto the tape ( you can find tone generators online), say track four then put the faulty board in channel four, playback the signal then trace it using the schematic as you go.
Your 388 uses op amps a lot so get the data sheet of your op amp/s, find which pin is out, usually pins 1 and 7 on dual op amp ic's with pins 4 and 8 being power supply. Same goes for transistors., check for a signal at the emmiter on NPN types.
A scope here is invaluble, but you can do it with a DMM as long as your DMM's AC range has the spec. If not, check your voltages on op amps and transistors.
I'm afraid it's a long fiddly job sometimes, and hard to tell you exactly what to do, but Teac manuals usually are excellent and walk you through. I havn't had time to go through your manual, but that's where you should start along with the above steps"
Feel free to add help. If im not responding anymore i sat myself on fire during "repairing"
Thanks
I got a little starting point on another board.
"Its sounds like you have a fault on that card, So its a case of inputing a signal, say 1khz and following it through from start to finish.
Record a 1khz signal onto the tape ( you can find tone generators online), say track four then put the faulty board in channel four, playback the signal then trace it using the schematic as you go.
Your 388 uses op amps a lot so get the data sheet of your op amp/s, find which pin is out, usually pins 1 and 7 on dual op amp ic's with pins 4 and 8 being power supply. Same goes for transistors., check for a signal at the emmiter on NPN types.
A scope here is invaluble, but you can do it with a DMM as long as your DMM's AC range has the spec. If not, check your voltages on op amps and transistors.
I'm afraid it's a long fiddly job sometimes, and hard to tell you exactly what to do, but Teac manuals usually are excellent and walk you through. I havn't had time to go through your manual, but that's where you should start along with the above steps"
Feel free to add help. If im not responding anymore i sat myself on fire during "repairing"
Thanks