Psychotron1976
New member
I'm currently restoring an old Tascam 388 which has been not love for a long time. It have a lot of positive things (heads in very good condition, mixer sound great except some noisy EQ (TL072CP to change I'm pretty sure) but the transport is unfortunately not working.
I think I solved the first issue with the control of the Solenoids due to a strange cut on one track - Servo Ground - of the Mother Board 2 (even if I don't understand how it happened):
I said "I Think" because I found another issue on the Reel Servo PCB when I unload the cards connected to the Mother board 2:
The transistor Q141 had burnt completely, taking with him the resistors R155 and R154 and the transistor Q142.
My guess is that one of the motors shorted and burned the Q141 transistors with him. Does it seems possible for you?
I will change the burned components but can I just reinstall the card and test the transport as it is or does I need to check if one of the motor is not dead before to avoid new burning? I already check the 35v and 15v power rail and they work correctly.
Thanks in advance for your help!
I think I solved the first issue with the control of the Solenoids due to a strange cut on one track - Servo Ground - of the Mother Board 2 (even if I don't understand how it happened):
I said "I Think" because I found another issue on the Reel Servo PCB when I unload the cards connected to the Mother board 2:
The transistor Q141 had burnt completely, taking with him the resistors R155 and R154 and the transistor Q142.
My guess is that one of the motors shorted and burned the Q141 transistors with him. Does it seems possible for you?
I will change the burned components but can I just reinstall the card and test the transport as it is or does I need to check if one of the motor is not dead before to avoid new burning? I already check the 35v and 15v power rail and they work correctly.
Thanks in advance for your help!