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FR-2LE service manual?

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borjam:
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!

Fatah Ruark (aka MIKE B):
From what I remember from mine, the headphone output is pretty useless. I don't think it's fixable, it just came that way.

borjam:

--- Quote from: Fatah Ruark (aka MIKE B) 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.

--- End quote ---
Exactly :)

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

heva:
It could be that the headphone amp is in the cirrus CS42L51 chip.
Not much to improve if so.

borjam:

--- Quote from: heva 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.

--- End quote ---
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.

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