You have two driver boards right? Which one are you using? If the old one it may have bad trimmer pots...
F-2624 Review
- Thread starter joe camilli
- Start date
joe camilli
Member
Here is a short video showing both the current and voltage
https://1drv.ms/v/s!AvvpJ1teKANUlTsn72W2GHXlqjjE
https://1drv.ms/v/s!AvvpJ1teKANUlTsn72W2GHXlqjjE
So it's out of protection? I see you're measuring offset at the speaker terminals. Volume at minimum? Careful with that outer heatsink off, those transistor cases are easy to bridge to ground maybe through you.
Last edited:
joe camilli
Member
Yes the unit is out of protection. Yes volume at minimum.
Tap the protection relay with a screwdriver or something, see if it settles down
joe camilli
Member
Not really any change when tapping on the relay.
I'm thinking it's a measurement issue because it's having little influence on the bias in the vid. Try swapping the meters around see if it's the same. I've got to go out for an hour or so. Back later..
joe camilli
Member
No change switching meters around
If this issue is present on both channels there may be a flaky ground in the speaker system or a flaky speaker switch. Try exercising it a few times..
joe camilli
Member
I do not if this makes difference but when i set the speaker selector to A+B or A+C voltage seems to settle down.
If, by settled down, you mean it's drifting up and down around zero by a couple of millivolts then that's fine; just means you need to clean the speaker switch contacts. If it's drifting more than that (or jumping) start looking for poor connections - pin header, relay contacts, pcb edge connector etc...
joe camilli
Member
I able to set both voltage and current on both channels when using speaker "B". Is this okay?
Linehand
Active Member
Yup that's fine, but like dbrewster said, your speaker selector switch could prob use a good cleaning if you ever need "A" back
joe camilli
Member
It's the weekend time for Joe's latest report. So with one DVM connected to the speaker "B" terminal and the other DVM set for mA and inline across the fuse holder, fuse removed. Unit comes out of protection mode and I can set both channels for voltage and current. Remove the DVM insert fuses and the unit will not come out of protection mode.
joe camilli
Member
Well if i remove the DVM from the speaker terminals the unit comes out of protection mode
Still got the positive meter probe in the mA port? Or the meter set to resistance?
joe camilli
Member
Okay no meters connected fuses installed and unit will not come out of protection mode. What is next?
joe camilli
Member
The system is in protection mode and on the DBT. I took the following readings:
The +50V can be checked at either of the F04 and F05 fuseholders. 32.5vdc
The -50V can be checked at terminal 17 or 21/22. -32.5vdc
The +53V can be checked at the junction of R04 and C07. 31.5 vdc
The -55v can be checked at the junction of R05 and C08. -33 vdc
The +50V can be checked at either of the F04 and F05 fuseholders. 32.5vdc
The -50V can be checked at terminal 17 or 21/22. -32.5vdc
The +53V can be checked at the junction of R04 and C07. 31.5 vdc
The -55v can be checked at the junction of R05 and C08. -33 vdc
joe camilli
Member
I switched to my new 2624 broad.The system is out of protection mode and on the DBT. I took the following readings:
The +50V can be checked at either of the F04 and F05 fuseholders. 43vdc
The -50V can be checked at terminal 17 or 21/22. -43vdc
The +53V can be checked at the junction of R04 and C07. 43 vdc
The -55v can be checked at the junction of R05 and C08. -44 vdc
The +50V can be checked at either of the F04 and F05 fuseholders. 43vdc
The -50V can be checked at terminal 17 or 21/22. -43vdc
The +53V can be checked at the junction of R04 and C07. 43 vdc
The -55v can be checked at the junction of R05 and C08. -44 vdc
