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Author Topic: FR-2LE service manual?  (Read 534 times)

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Offline borjam

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FR-2LE service manual?
« on: June 13, 2018, 11:55:58 AM »
Hi,

I've got a Fostex FR-2LE. Nice preamps but the headphone output really sucks. I wonder,
is it possible to find a service manual anywhere?

Thanks!
"Don't worry about the drums. I'm a percussionist, I can play on carton boxes" - Peer Wyboris

Offline Fatah Ruark (aka MIKE B)

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Re: FR-2LE service manual?
« Reply #1 on: June 13, 2018, 12:24:59 PM »
From what I remember from mine, the headphone output is pretty useless. I don't think it's fixable, it just came that way.
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Offline borjam

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Re: FR-2LE service manual?
« Reply #2 on: June 13, 2018, 12:33:27 PM »
From what I remember from mine, the headphone output is pretty useless. I don't think it's fixable, it just came that way.
Exactly :)

Not meaning to "fix" it, but maybe to replace its amplifier with something better.

"Don't worry about the drums. I'm a percussionist, I can play on carton boxes" - Peer Wyboris

Offline heva

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Re: FR-2LE service manual?
« Reply #3 on: June 13, 2018, 02:58:18 PM »
It could be that the headphone amp is in the cirrus CS42L51 chip.
Not much to improve if so.

Offline borjam

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Re: FR-2LE service manual?
« Reply #4 on: June 13, 2018, 04:48:59 PM »
It could be that the headphone amp is in the cirrus CS42L51 chip.
Not much to improve if so.
Ouch! You are right, looking at the datasheet it's clear that "line out" is derived from the headphone output as well!

Pity that the chip is a bit limited.

https://statics.cirrus.com/pubs/proDatasheet/CS42L51_F2.pdf

Only possibility would be to reduce the gain of the output stage (which means snooping on the I2C or SPI bus and replacing certain commands) and adding a proper amplifier. Cheaper to upgrade to a MixPre 3 or a Zoom F4 but might do it for fun.



« Last Edit: June 14, 2018, 02:40:29 AM by borjam »
"Don't worry about the drums. I'm a percussionist, I can play on carton boxes" - Peer Wyboris

Offline borjam

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Re: FR-2LE service manual?
« Reply #5 on: June 14, 2018, 12:42:11 PM »
Now this is odd. That chip is used in music players with (reportedly) good audio.

Has anyone explored options? (Not intending to reinvent the wheel) :)
"Don't worry about the drums. I'm a percussionist, I can play on carton boxes" - Peer Wyboris

 

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