nakamichi amp 1 again!

reddish75 · 25th December 2006, 11:58 PM

having found this amp in a friends loft, and it not working i decided to try and repair it, but with no schmatics it's proving difficult.

first i replaced all the transistors( there were big chunks missing from them), and also replaced burned out resistors and 1 3.15 amp fuse. having done this i switched it on, it powered up but the power led was flashing and after about 30 sec the 3.15 fuse went again.

can anyone suggest what the problem is with this amp, is it drawing too much power or have the power capasitors gone?

also the amp draws 600w is a 13a fuse in the plug going to cause problems?

thanks

Richard Ellis · 26th December 2006, 12:31 AM

OK...first off we need to know which Nack. amp you have..Can you give us a model number? Also it might help if you had a serial number...there might be running production updates, year codes and/or plant codes in said serial number.
I would bet dollars to donuts that there is a pure nackamichi person on this forum who has a schematic.
If we can go thru said schematic & find the components that were bad we can trace down the failed system.
____________________________________Rick.......... .

reddish75 · 26th December 2006, 09:25 AM

its an nakamichi amplifier 1 and the serial number is 01286 with b109 in small writing above it

thanks

jazzy jake · 23rd December 2007, 10:06 AM

hi did you ever get the schematics for this amp? been looking as well for owner's manual and specifications. can anyone in the forum be of help?

thanks a million!
merry christmas everyone!

reddish75 · 23rd December 2007, 01:09 PM

not the owners manual but the service manual, fixing it was an absolute nightmare i ended up replacing the all of the output transistors and all of the drivers plus various resisters on both channels, i you want o copy of the service manual just e-mail me and ill send it over

jazzy jake · 27th December 2007, 10:44 PM

many thanks, couldn't email thru "diyaudio" since am a new member - "my account is in moderation...etc.etc..."

anyway you could also send to my yahoo - jakedavid_2004@yahoo.com

a million thanks for this reddish75!

by the way, would you know where i could also get a copy of the owner's manual for the naks 1?

thanks again!

25th December 2006, 11:58 PM	#1
reddish75 diyAudio Member Join Date: Aug 2006	nakamichi amp 1 again! having found this amp in a friends loft, and it not working i decided to try and repair it, but with no schmatics it's proving difficult. first i replaced all the transistors( there were big chunks missing from them), and also replaced burned out resistors and 1 3.15 amp fuse. having done this i switched it on, it powered up but the power led was flashing and after about 30 sec the 3.15 fuse went again. can anyone suggest what the problem is with this amp, is it drawing too much power or have the power capasitors gone? also the amp draws 600w is a 13a fuse in the plug going to cause problems? thanks

26th December 2006, 12:31 AM	#2
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	The Nackamichi.... OK...first off we need to know which Nack. amp you have..Can you give us a model number? Also it might help if you had a serial number...there might be running production updates, year codes and/or plant codes in said serial number. I would bet dollars to donuts that there is a pure nackamichi person on this forum who has a schematic. If we can go thru said schematic & find the components that were bad we can trace down the failed system. ____________________________________Rick.......... .

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26th December 2006, 09:25 AM	#3
reddish75 diyAudio Member Join Date: Aug 2006	its an nakamichi amplifier 1 and the serial number is 01286 with b109 in small writing above it thanks

23rd December 2007, 10:06 AM	#4
jazzy jake diyAudio Member Join Date: Dec 2007	hi did you ever get the schematics for this amp? been looking as well for owner's manual and specifications. can anyone in the forum be of help? thanks a million! merry christmas everyone!

23rd December 2007, 01:09 PM	#5
reddish75 diyAudio Member Join Date: Aug 2006	not the owners manual but the service manual, fixing it was an absolute nightmare i ended up replacing the all of the output transistors and all of the drivers plus various resisters on both channels, i you want o copy of the service manual just e-mail me and ill send it over

27th December 2007, 10:44 PM	#6
jazzy jake diyAudio Member Join Date: Dec 2007	many thanks, couldn't email thru "diyaudio" since am a new member - "my account is in moderation...etc.etc..." anyway you could also send to my yahoo - jakedavid_2004@yahoo.com a million thanks for this reddish75! by the way, would you know where i could also get a copy of the owner's manual for the naks 1? thanks again!

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