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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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18th Nov 2021, 3:07 pm | #1 |
Diode
Join Date: Nov 2021
Location: Salo, Finland.
Posts: 4
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Alpage AL-300 only plays 1 channel.
Hi, I need some help! I have no idea where to start so any help is really valued
I bought this beauty and it didn't work at all, and it was really dirty. Anyway I cleaned it and opened it to find out the belt had melted. Through trial and error and watching youtube videos I manage to replace the belt. And it works now! but only in the left channel. Rec button also does nothing. Now I have no idea if it's something I did or is it something else. Attached two pictures of the beauty. |
18th Nov 2021, 6:20 pm | #2 |
Octode
Join Date: Dec 2019
Location: Owston Ferry, North Lincolnshire, UK.
Posts: 1,701
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Re: Alpage AL-300 only plays 1 channel.
Have you cleaned the record/playback changeover switch on the pcb (assuming that it has one)? Also check the wires to the record/playback head, possibly a broken solder joint.
Dave
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Quote "All is hyperthetical, until it isn't!" (President Laura Roslin, Battlestar Galactica) |
18th Nov 2021, 11:55 pm | #3 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,600
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Re: Alpage AL-300 only plays 1 channel.
Hei and welcome to the Forum.
A very nice looking and complex deck. I also immediately thought of the Playback/Record switch cleaning but a quick look at the schematic possibly looks like it has electronic signal switching. David |
19th Nov 2021, 10:42 am | #4 |
Octode
Join Date: Dec 2019
Location: Owston Ferry, North Lincolnshire, UK.
Posts: 1,701
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Re: Alpage AL-300 only plays 1 channel.
Further to my last, it could be a missing earth/ground connection to the right channel record and play sections of the tape head. I could be wrong but the circuit suggests a shared connection either in the wiring or pcb attached to the head. Since the head appears to have seperate rec and play sections, I think it unlikely for the head to have failed, although that can't be ruled out however it is simple enough to check.
After that it looks like voltage and waveform checks through the right channels. Not checked but there might be a shared supply or earth track to the record and play stages in the right channel. Dave
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Quote "All is hyperthetical, until it isn't!" (President Laura Roslin, Battlestar Galactica) |
19th Nov 2021, 10:48 am | #5 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,326
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Re: Alpage AL-300 only plays 1 channel.
The photos appear to show the knobs are at different settings. I think the knob on the line in should be on the master volume position. It also looks like the others are not correctly fitted. I assume that these are dual splined knobs.
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19th Nov 2021, 10:50 pm | #6 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,711
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Re: Alpage AL-300 only plays 1 channel.
As for the record button doing nothing, check that the anti-erasure tabs on the back of your cassette are intact!
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25th Nov 2021, 12:37 pm | #7 | |
Diode
Join Date: Nov 2021
Location: Salo, Finland.
Posts: 4
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Re: Alpage AL-300 only plays 1 channel.
Quote:
the big button can be in output level or in REC level. |
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25th Nov 2021, 12:46 pm | #8 |
Diode
Join Date: Nov 2021
Location: Salo, Finland.
Posts: 4
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Re: Alpage AL-300 only plays 1 channel.
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6th Dec 2021, 11:53 am | #9 |
Diode
Join Date: Nov 2021
Location: Salo, Finland.
Posts: 4
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Re: Alpage AL-300 only plays 1 channel.
This was it. Thank you so much for the help everyone.
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