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BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Tue Apr 12, 2022 11:09 pm
by fuzzbuzzfuzz
I was just about to ship my spare HF-2 to its new owner, when upon checking I noticed it refuses to fire up and work with a power supply.
- NO LED lit with ACA supply (2 tried) - bypass sound only, NO EFFECT sound.
- NO LED lit with PSA or "Normal" 9v power supply, NO EFFECT sound.
- LED lit with battery, BYPASS + EFFECT sound out.
- LED lit daisy chain to BOSS TU-2,, BYPASS + EFFECT sound out.
As a precaution I replaced the power-in Jack with a new one, but the same as above.
Quite a perplexing case!
Any help and wisdom appreciated, thanks!
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Tue Apr 12, 2022 11:10 pm
by fuzzbuzzfuzz
fuzzbuzzfuzz wrote: ↑Tue Apr 12, 2022 11:09 pm
I was just about to ship my spare HF-2 to its new owner, when upon checking I noticed it refuses to fire up and work with a power supply.
- NO LED lit with ACA supply (2 tried) - bypass sound only, NO EFFECT sound.
- NO LED lit with PSA or "Normal" 9v power supply, NO EFFECT sound.
- LED lit with battery, BYPASS + EFFECT sound out.
- LED lit daisy chain to BOSS TU-2,, BYPASS + EFFECT sound out.
As a precaution I replaced the power-in Jack with a new one, but the same as above.
Quite a perplexing case!
Any help and wisdom appreciated, thanks!
(Note: I see no obvious differences in wiring or modifications compared to my current HF-2 (which works with the adaptors mentioned above)
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Tue Apr 12, 2022 11:11 pm
by fuzzbuzzfuzz
fuzzbuzzfuzz wrote: ↑Tue Apr 12, 2022 11:10 pm
fuzzbuzzfuzz wrote: ↑Tue Apr 12, 2022 11:09 pm
I was just about to ship my spare HF-2 to its new owner, when upon checking I noticed it refuses to fire up and work with a power supply.
- NO LED lit with ACA supply (2 tried) - bypass sound only, NO EFFECT sound, bypass sound always when toggled on/off.
- NO LED lit with PSA or "Normal" 9v power supply, NO EFFECT sound. Bypass sound always when toggled on/off.
- LED lit with battery, BYPASS + EFFECT sound out.
- LED lit daisy chain to BOSS TU-2,, BYPASS + EFFECT sound out.
As a precaution I replaced the power-in Jack with a new one, but the same as above.
Quite a perplexing case!
Any help and wisdom appreciated, thanks!
(Note: I see no obvious differences in wiring or modifications compared to my current HF-2 (which works with the adaptors mentioned above)
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Wed Apr 13, 2022 3:12 am
by laurie
Wierd. Seems like the flip-flop that switches the FETs has malfunctioned.
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Wed Apr 13, 2022 6:37 am
by fuzzbuzzfuzz
laurie wrote: ↑Wed Apr 13, 2022 3:12 am
Wierd. Seems like the flip-flop that switches the FETs has malfunctioned.
Where might that be on the PCB Laurie? thanks!
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Wed Apr 13, 2022 6:48 am
by Pepe
Since power with a battery and the PSA-daisy-chain method works, might there be a problem with the few components of the ACA input?
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Wed Apr 13, 2022 7:56 am
by fuzzbuzzfuzz
Pepe wrote: ↑Wed Apr 13, 2022 6:48 am
Since power with a battery and the PSA-daisy-chain method works, might there be a problem with the few components of the ACA input?
Possibly the protection diode? I wonder which that is (there being a few on the pcb)
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Fri Apr 15, 2022 2:48 pm
by laurie
I want to make sure I understand the description of the problem:
- NO LED lit with ACA supply (2 tried) - bypass sound only, NO EFFECT sound.
Bypass works fine, but pedal does not switch to effected mode when treadle pressed?
- NO LED lit with PSA or "Normal" 9v power supply, NO EFFECT sound.
Bypass works fine, but pedal does not switch to effected mode when treadle pressed?
- LED lit with battery, BYPASS + EFFECT sound out.
Bypass works fine and effect work fine. Pedal switches to effected mode and back normally when treadle pressed?
- LED lit daisy chain to BOSS TU-2,, BYPASS + EFFECT sound out.
Bypass works fine and effect work fine. Pedal switches to effected mode and back normally when treadle pressed?
Re: BOSS HF-2 Power/LED problem. Any help appreciated!
Posted: Sat Jun 04, 2022 5:17 pm
by laurie
Did this get sorted?