Hal Communications ST-6000, Instruction Manual

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5-8
be used in conjunction with the FOCUS and INTENSITY front panel controls to provide a sharp,
well defined trace. This control has been factory adjusted and should not require readjustment un-
less the CRT itself is replaced. The front panel controls are self-explanatory and may be adjusted
to the user's preference.
5.6 Cabinet Wiring
The ST-6000 is constructed in semi-modular form with most of the circuitry on the two large cir-
cuit boards, the input and control boards. The six LED indicators are mounted on a flexible circuit
board which is attached directly to the switches on the control board. All of the rear panel connec-
tors (with exception of the MOTOR and power line connectors) directly connect to a rear panel
"mother" board that provides all RF bypassing and interconnection points to other connectors and
circuit boards of the demodulator. Connections between the circuit boards and to cabinet- mount-
ed components are made with either 16-conductor ribbon cables and plugs or plastic multi-conduc-
tor connectors similar to those used on the rear panel. All subassemblies are designed to permit
quick removal for testing or replacement without unsoldering connections. Figure 5.14 shows the
cable listings for each interconnect cable used in the ST-6000.
5.7 User Servicing
As discussed in this section and in section 4, there are a number of internal adjustments that
the user may wish to trim to his requirements. Be careful to adjust ONLY these specific controls.
Adjustment of other interior controls, particularly those in the active filter circuits is NOT RECOM-
MENDED. These adjustments should not change with time. If problems with these circuits are en-
countered, it is best to have the factory or authorized service representative test and service the
complete unit. The user can check for presence of the indicated power supply voltages, if desired,
but it is preferable to have all repairs made by the factory. If you should have to return the unit to
the factory for service be sure to:
1. Write us in advance (or call) and get a return authorization.
2. Pack the unit CAREFULLY with ADEQUATE soft packing material to prevent shipping dam-
age.
3. INCLUDE IN THE BOX WITH THE EQUIPMENT a list describing the failure mode(s) encoun-
tered.
4. Ship the unit (via UPS, preferred) to
HAL Communication Corp.
1201 W. Kenyon Rd.
Urbana, IL 61801
Attention: Service Department