TEAC 1/2" Open-Reel Schematic Needed

[Chris F.]

I have a Teac Model 80-8 1/2" open reel machine I have to repair for a
customer. This is the first 1/2", 8-track machine I've worked on and it's
clear I'm going to need a schematic. The main problem is that some channels
are sounding through to others; for example, with a signal connected to
channel 1 only, it sounds over to channel 2 and faintly to channel 3. This
happens even when monitoring the input without a tape loaded, ruling out a
head alignment issue.
Any advice, or especially a schematic, would be appreciated.

[Phil Allison]

"Chris F."

** Have you tried shorting the unused inputs while testing ??

This is how the recorder would be used in practice.

.... Phil

[forte agent]

On Sat, 22 Jan 2011 18:48:16 -0800, "Chris F." <zapp...@hotmail.com>
wrote:

You should be able to get the service manual from:

TEAC America inc
7733 Telegraph Road
Montebello, CA 90640

Parts Department:
voice: (323) 727-4840
fax: (323) 727-7632
e-mail: pa...@teac.com

I do know that they had copies of the manuals for many of their
old to ancient(early 70's) tape machines.
I worked there for a year and a half and they were still repairing
1/4, 1/2, 1 , and larger machines at that time (3 1/2 years ago)

[Pimpom]

http://www.analogrules.com/manuals/tascam.html

[Pimpom]

If that doesn't eliminate the crosstalk, I'd suspect a common
power supply filter in the low-level stages. Perhaps a dried-up
cap.

[Dave M]

There's a Teac-specific web site at https://www.daeinconline.com/index.html.
Send them an email and see if they can help with your problem. They might
even have a manual on the bottom shelf..
--
David
dgminala at mediacombb dot net