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Tape Tech / Re: Extended Response Heads
« on: August 22, 2013, 11:29:07 AM »
sounds interesting...if anyone has original good playback heads they do not want I would like to purchase them...
Thank you
Lawrence
Thank you
Lawrence
TP-027, Jerry Garcia / David Grisman wins a Writer's Choice Award from Myles Astor of Positive Feedback Online
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 20, 2013, 02:42:53 PM »
alright for anyone who many care...I wanted to give you a follow up as i have been playing some tapes ...
I will say the recapping makes this deck IMO up there with the very very best of them....my partner has a few of the ATR machines with aria electronics..20k each and I will not be ashamed to compare :)
and ..and i still have not done the preamp sections!...
wonderful machine I really do understand why there is such a following
Lawrence
I will say the recapping makes this deck IMO up there with the very very best of them....my partner has a few of the ATR machines with aria electronics..20k each and I will not be ashamed to compare :)
and ..and i still have not done the preamp sections!...
wonderful machine I really do understand why there is such a following
Lawrence
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 20, 2013, 11:00:22 AM »
Ok that was it i just tested it! ....I really appreciate you guys help thank you!!!!
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 20, 2013, 10:21:31 AM »
Ok did the repair...very very tiny wires like in a phono cartridge! here is a pix of the repair
I do not know if it will matter but i unwound about half turn to solder them ....back together and coated them with superglue! coil reads 10ohms
I do not know if it will matter but i unwound about half turn to solder them ....back together and coated them with superglue! coil reads 10ohms
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 20, 2013, 12:38:23 AM »
yes i was thinking on the vary same lines....wires are exposed but they are very small same size a phono cartridge wire....I will experiment tomorrow and see what i can do its too late for anything and i need to think on it..
do you have a beat up spare motor?
do you have a beat up spare motor?
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 10:17:53 PM »
ya Tim I found the problem and attempted to fix/solder them tiny wires...but they are just not long enough....so the question is where can i find a pair of the detection coils?
they look like they are just glued can you help
Thanks for everything..
they look like they are just glued can you help
Thanks for everything..
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 09:11:18 PM »
ok no connection on pin1 and 8 brown and grey wires ....ok so this looks like the problem....suggestions please
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 08:55:07 PM »
Tim yes all the voltages on connector I are correct the 15volt measure 14v but the rest is fine...
no the motor did not work after the recap of the main control,capston and reel motor and tension control boards were redone but i cannont fine issues with them..
I did the main power supply first and everything worked fine..until i took the motor apart and or recap those boards...
I hope i answered and gave you enough to go on...
no the motor did not work after the recap of the main control,capston and reel motor and tension control boards were redone but i cannont fine issues with them..
I did the main power supply first and everything worked fine..until i took the motor apart and or recap those boards...
I hope i answered and gave you enough to go on...
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 04:24:34 PM »
ok sorry scratch my last post i forgot that the capstan motor plug has a jumper from
pin 1 to pin 2....this is what bring in the 21volt off of pin 5 on the power supply connector....
but I did check and resolderd all the connectors..this is not the issue...I also checked and rechecked all the capacitors...there was an error.... that when the unit was built they installed the wrong cap! c924 and c923 should be 33uf caps in series ...my board had a .22uf in c924 spot... so i replaced it with the correct 33uf cap...
it still may be still in the motor ....any luck or could you post the pinout so i can ring out the motor windings..my schematic is not correct or something..
Thank you
Lawrence
pin 1 to pin 2....this is what bring in the 21volt off of pin 5 on the power supply connector....
but I did check and resolderd all the connectors..this is not the issue...I also checked and rechecked all the capacitors...there was an error.... that when the unit was built they installed the wrong cap! c924 and c923 should be 33uf caps in series ...my board had a .22uf in c924 spot... so i replaced it with the correct 33uf cap...
it still may be still in the motor ....any luck or could you post the pinout so i can ring out the motor windings..my schematic is not correct or something..
Thank you
Lawrence
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 03:39:20 PM »
ok more updates...thanks guys I really appreciate all your time and help...
ok so i did start to check test points....no voltage at TP910 its suppose to be about 10 volts or so..i get .8volts ..something i dragging down the voltage I check with an DVM the transistors involved no shorts or anything ...suggestions...my thoughts are I will have to isolate the various transistors(desolder) one end of the feeding resistors...and see if they still bring down the voltage...
if you have some easy way ..please help
Lawrence
I still need to know the correct orientation of the washers in the motor
ok so i did start to check test points....no voltage at TP910 its suppose to be about 10 volts or so..i get .8volts ..something i dragging down the voltage I check with an DVM the transistors involved no shorts or anything ...suggestions...my thoughts are I will have to isolate the various transistors(desolder) one end of the feeding resistors...and see if they still bring down the voltage...
if you have some easy way ..please help
Lawrence
I still need to know the correct orientation of the washers in the motor
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 01:25:12 PM »
ok reflowed all the joints on the circuit board...no luck...
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 19, 2013, 09:51:56 AM »
ok will do thank you
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 18, 2013, 11:36:12 PM »
ok I checked the spacing is about 32nd .031 and i rang out all of the wires from the plug to where they are soldered onto the board..all ring good! ok now what?
Lawrence
Lawrence
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 18, 2013, 09:11:10 PM »
ok Tim will do ....no this is not beyond me ...I can do most things even very small cartridge repair...
Give me a few I will get back to you again...but like i said what would cause the power transistors to warm up?
Give me a few I will get back to you again...but like i said what would cause the power transistors to warm up?
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Reel to Reel Tape Machines / Re: Technics 1520 motor help
« on: August 18, 2013, 04:35:45 PM »
looking at the pinout on the schematic and the actual connector they do not match up! pin 1and2 have a small jumper across them there is no wire or pin on pin 3 and the rest have wires up till pin 15 but there is no pin 15 on the schematic!...whats going on here??
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