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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Nakamichi TA-2 Receiver in a funk
I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this?
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#2
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Nakamichi TA-2 Receiver in a funk
On Tue, 15 Jan 2013 06:50:24 -0800 (PST), j
wrote: I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this? I would first check the electrolytic caps in the power supply. Noise on the B+ lines will cause all matter of digital problems with this model. Chuck |
#3
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Nakamichi TA-2 Receiver in a funk
j wrote in message
... I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this? What ident is the big an. sw. ? |
#4
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Nakamichi TA-2 Receiver in a funk
On Tuesday, January 15, 2013 10:45:36 AM UTC-5, N_Cook wrote:
j wrote in message ... I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this? What ident is the big an.. sw. ? There should be a switching IC (LCxx22 or TC9163) located on the board. In many cases this is the problem. You will see the signal entering the IC, but no output. I believe that the light and the audio are controlled by the same line. The few of these I have seen in the past were quick fixes by replacing the switching IC. (IIRC) Dan |
#5
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Nakamichi TA-2 Receiver in a funk
In article ,
j wrote: I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this? Did Nakamichi do the thing with the button lights that they did on some other units? (The lights were used as the pullup resistors in the matrix scanned keyboard or something strange like that). Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
#6
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Nakamichi TA-2 Receiver in a funk
"chuck" wrote in message
... On Tue, 15 Jan 2013 06:50:24 -0800 (PST), j wrote: I'm trying to troubleshoot a 1980'2 era Nak receiver that has pushbutton input switching via a microprocessor (can also be remote controlled). The button lights don't work, and I get no input connections at all. Strange, but the micro works, controlling the volume up and down. Also, the amp works via the pre-out and power-in jumpers. Apparently, some aspect of the switching (done via an analog switch IC) is screwed up. Anyone have ideas on how to troubleshoot this? I would first check the electrolytic caps in the power supply. Noise on the B+ lines will cause all matter of digital problems with this model. Chuck I was able to download a service manual from Elektrotanya. The site is difficult to access if you don't speak Hungarian but I can email you the manual. email me at: and reverse "labolgcbs" to read "sbcglobal". Mark Z. |
#7
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Nakamichi TA-2 Receiver in a funk
On Tue, 15 Jan 2013 06:50:24 -0800 (PST), j put
finger to keyboard and composed: I'm trying to troubleshoot a 1980'2 era Nak receiver ... http://diagramas.diagramasde.com/aud...2_2A_2E_20.pdf - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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