17
•
Remove (and retain) the two metal screws holding the bias relay.
•
Remove and discard the bias relay, lifting it upward and slightly forward, cutting each
attached wire as necessary.
NOTE:
The filament transformer “CT” terminal is electrically connected to the
filament choke via a “green” wire. In some amplifiers, this green wire attaches directly
to the filament choke, then via jumper to the bias relay. In other amplifiers, this green
wire attaches directly to the bias relay, then (via spaghetti-covered jumper) to the
filament choke. This electrical connection between the filament choke and the filament
transformer “CT” terminal must be retained. Ensure that the wire running from the
filament transformer “CT” terminal is connected to the filament choke as shown to the
far left in Figure 3.12.
When finished, there should be a small rectangular opening in the chassis, located between
the “RF Input” and “RF Output” SO-239 connectors as shown in Figure 3.12.
Figure 3.12: After Bias Relay Removal
The QSK T/R Relay PCB has a board-mounted male two-pin connector. This connector
mates with a corresponding female two-pin connector – One wire is yellow and connects
directly to the 10-pin Bias PCB connector – One wire is brown and needs to be soldered to
the High-Voltage transformers’ “TH-1” terminal (visible in Figure 3.10).
•
Follow the #22 brown wire shown in Figure 3.12 and de-solder it from the High-Voltage
transformers’ “TH-1” terminal.
www.KesslerEngineeringLLC.com
Summary of Contents for TL-922 Revival (tm)
Page 13: ...6 Figure 3 1 TL 922 Revival tm Upgrade Kit Contents www KesslerEngineeringLLC com...
Page 18: ...11 Figure 3 4 LED Circuit Board Correctly Installed www KesslerEngineeringLLC com...
Page 30: ...23 Figure 3 19 QSK PCB to QRO Output Connections www KesslerEngineeringLLC com...
Page 34: ...27 Figure 3 23 Electronic Bias PCB Installed www KesslerEngineeringLLC com...
Page 47: ...40 Figure 3 30 Step Start PCB www KesslerEngineeringLLC com...
Page 49: ...42 Figure 3 33 LED Schematic Diagram Figure 3 34 LED PCB www KesslerEngineeringLLC com...
Page 50: ...43 Figure 3 35 Electronic Bias Schematic Diagram www KesslerEngineeringLLC com...
Page 51: ...44 Figure 3 36 Electronic Bias PCB www KesslerEngineeringLLC com...
Page 54: ...47 User Notes www KesslerEngineeringLLC com...
Page 55: ...48 5 1 User Notes Continued www KesslerEngineeringLLC com...
Page 56: ...49 5 2 User Notes Continued www KesslerEngineeringLLC com...
Page 57: ...50 5 3 User Notes Continued www KesslerEngineeringLLC com...
