Quantar UHF R2 Amplifier Fans

Status
Not open for further replies.

k4iii

New Member
Joined
May 10, 2013
Messages
3
I acquired a 100w UHF R2 Amplifier (TLN3446) and noticed the 2 amplifier fans began running when powering on the unit and they stay on indefinately. The amp and alignment process worked perfect with no station errors or isseus. However, when I stuck another TTE2062 (original amp) in it, the fans only ran after a duration of keyup so it had something to do with the TLN3446 module. I opened up the module and noticed that L4123 was missing as well as the cap c4129 from the rear connector. I've installed a 100pF capacitor, but am having trouble finding the 220NH coil part that is missing... Everything else seems present on the card.

Actually, it looks like the coil and capacitor was never installed. I would like to get the fans working properly (I don't want them burning out early from over-running when not being used) and was wondering whether anyone had the part or information on the 220NH chip or where it could be ordered from. Was the fan sensor perhaps an option or L4123 removed to set fans to run 24-7 on certain stations, maybe control channels or for paging?

Just wondering... Thanks.
 
W

Will

Guest
I would not think the choke is any more than a filter. There are many chip inductors available. I do not have the schematic(s) for that part of the station.
 

Astro Spectra

T¹ ÆS Ø - Moderator, CS Forums $upporter
Staff member
CS Forums $upporter
Joined
Nov 22, 2012
Messages
1,017
L4123 is not real critical, it's in series with the FAN ON signal that feeds the base of Q4103 via R4174. The fans are always on because without the choke in place the base is pulled up via R4175. Simply bridge the pads of L4123 or, if you like, drop in a small moulded choke and the fans will operate normally.
 
Last edited:
W

Will

Guest
Ah, seems that there IS a roadmap.. Thanks AS for the info it make good sense.
 
OP
K

k4iii

New Member
Joined
May 10, 2013
Messages
3
Worked! Thanks...

Thanks!!! That did it! I'll have to write this one down in case I want the fans always running someday!

L4123 is not real critical, it's in series with the FAN ON signal that feeds the base of Q4103 via R4174. The fans are always on because without the choke in place the base is pulled up via R4175. Simply bridge the pads of L4123 or, if you like, drop in a small moulded choke and the fans will operate normally.
 
Status
Not open for further replies.