TEAC 1/2" Open-Reel Schematic Needed
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. |
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. ** Have you tried shorting the unused inputs while testing ?? This is how the recorder would be used in practice. ..... Phil |
TEAC 1/2" Open-Reel Schematic Needed
On Sat, 22 Jan 2011 18:48:16 -0800, "Chris F."
wrote: 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. 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: 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) |
TEAC 1/2" Open-Reel Schematic Needed
Chris F. wrote:
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. http://www.analogrules.com/manuals/tascam.html |
TEAC 1/2" Open-Reel Schematic Needed
Phil Allison wrote:
"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. ** Have you tried shorting the unused inputs while testing ?? This is how the recorder would be used in practice. 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. |
TEAC 1/2" Open-Reel Schematic Needed
Pimpom wrote:
Phil Allison wrote: "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. ** Have you tried shorting the unused inputs while testing ?? This is how the recorder would be used in practice. 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. 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 |
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