Hal Communications ST-6000, Instruction Manual

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5-9
ST-6000 Operating and Trouble-shooting Guide
General Notes on Receiving:
1) The signal type should match the printing equipment being used. Normal signals are standard
Baudot or ASCII code (no greater than 110 baud).
2) HAL video printing equipment will only copy asynchronous data.
3) Normal/Reverse switch should be set to Normal and transceiver on Lower Sideband for most
Amateur Radio RTTY.
4) The receiver passband should be sufficient to pass both mark and space tones, or attenuation
of the higher tone may result.
5) In the presence of selective fading, use the ATC only if the sending rate is relatively fast. Oth-
erwise, turn ATC off.
6) Use DTH only with high signal levels.
7) If you intend to run RS-232 or MIL-188 signals out of the ST-6000 to drive a printer, be sure to
refer to sections 3 and 4 of the manual!
8) Cables are extremely important. Check all cables and pin connections carefully before operat-
ing the unit. This should include the auxiliary jumper plug (J3) on the back of the 6000 to in-
sure that it is properly seated and all pins are making contact.
RCV
Does the 6000 receive off the air?

Go to XMIT

No Yes
Is power on?

Check AC fuse, power cord, power line voltage

Yes No
Is the tuning indicator working)

Check audio input cables, proper shift selected,

Yes No Limiter on
Is the Auto light on?

Is signal valid and being properly tuned, has
No the ST-6000 been on long enough for autostart
to activate, check SLOW-FAST position, Limiter
on check and adjust auto threshold potentiome-
ter (internal)
Are Mark and Space lights both flashing?

Print switch in line mode, KOS not active, check
No REMOTE STANDBY (J3-2) line - should be high,
check loop 3 jumper, loop fuse, check series

Yes loop (J8) circuit, ungrounded loop, loop polarity
observed when necessary? Check all cables,
auxiliary jumper plug (J3), ribbon cables inside
unit
Are you now getting print?

Retrace RCV section if no success, more infor-

Yes mation needed (if using RS-232/MIL-188, see
special instructions)
Now check other shifts and speeds.