TEN TEC 555 SCOUT
TEN TEC 556 ARGO
Maintenance and Troubleshooting pages
The NA5N
The NA5N modified Scout (optimized for CW and QRP/QRO)
Front panel variable TX PWR control, 350W.
RIT (delta f) LED illuminates when RIT is off zero
RX and TX LEDs
CW active audio filter selectable 500 Hz CW/170 Hz CWN
   "NAR" LED illuminates when in CWN mode
PLL zero-beat detector
   "DET" LED illuminates with sidetone 650-730 Hz (offset zero-beat)
   "ACQ" LED (acquire) when Scout is NOT in zero beat to RX station
A few internal mods for quieter IF, less audio gain, removed MIC connector,
   bypassed SSB balanced modulator, LLD changes, etc.

A great little CW rig ... works like a champ!
tt001009.jpg
Click image to open .pdf file (5MB) 
Troubleshooting Document contains:
Parts layout  Receiver Control Board
Parts layout IF/Audio Board
Parts layout Low Level Driver Board
   > Plus additional details
Functional block diagram, with waveforms,
   Scout RECEIVE path
Functional block diagram, with waveforms,
   Scout TRANSMIT path
Some Scout History and Trivia
   Misc. production details
 
 
tt001008.jpg tt001007.jpg tt001006.jpg tt001005.jpg tt001004.jpg
TROUBLESHOOTING DRAWINGS
Functional Block Diagrams
with oscope waveforms 
RECEIVE PATH
TRANSMIT PATH
Parts Layout drawings
with oscope waveforms, connector functions, other details
RECEIVER CONTROL
BOARD
IF/AUDIO
BOARD
LOW LEVEL DRIVER
BOARD
Modification details, photos, schematics here
SCOUT
Mod Page
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