Bandswitch Board - Ten-Tec 1253 Assembly And Instruction Manual

6-44. Keeping the Group 1-5 bundle neat and tight, secure
a second cable tie about 1" from the first one.
6-45. Secure a third cable tie around the Group 1-5 bundle
near the position of L1 on the main board. The result should be
a neat cable running down the inside of the subpanel, along the
edge of the receiver board, with neat connection lengths to Band
#1 through Band #5.
6-46. Referring to your experience with steps 6-43 to 6-45,
make a neat bundle for wire Group 6-9, using two cable ties.
The first tie should be near the bandswitch board, with one more
in the middle of the cable bundle near the U2 regulator IC.
Bandswitch Board Test (Optional)
6-47. It this simple test is not conducted now, it will be
necessary to partially disassemble the completed receiver to
determine any problem. If you are fully confident in the
correctness and quality of your work in Phase 6, proceed with
the work in Phase 7. At this point, you have the choice to
simply connect DC voltage to check for proper operation of the
bandswitching system OR also to reconnect speaker and antenna
to try out the receiver outside of its cabinet. We recommend
only the simpler test, because there can be no useful final
adjustment of trimmer R6 until the board is mounted in its
intended environment. Also, the unshielded board assembly may
exhibit annoying AC ripple or hum which is not characteristic of
the properly-completed receiver.
TEST PROCEDURE:
6-48. Reconnect 12-15 VDC to the red and black wires used
in previous tests.
6-49. Upon connection of DC voltage, ONE (only) band LED
should be illuminated. This is normally but not necessarily Band
1. While grasping the subpanel for steadiness, gently and
quickly press the switch button with your finger or the eraser
end of a pencil. Each press of the button should advance the
decade counter IC to light the next LED. Press the button to
take the counter through all 9 bands, several times if you wish.
Don't be alarmed if there is an occasional skip to a higher band
under these test conditions. DO be concerned if there are one or
more LED's which NEVER light, an indication of an assembly
problem which must be corrected before final assembly.
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