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QS-200S Instruction Manual
DISASSEMBLY/ASSEMBLY
Disassembly for maintenance consists of removing the side knobs and handle/positioner, top, and bottom
covers. With the top and bottom covers removed, unfasten the two screws holding the first scanner
printed circuit assembly to the side struts and the four screws holding J1 and J2 on the scanner assembly
to the rear panel. The scanner assembly may then be placed component side up in front of the QS-200S.
The second scanner can be removed in the same manner. If complete detachment is necessary, unplug the
cable assembly from the scanner assembly. Normally, this provides sufficient access for servicing.
When servicing operations are performed with power supplied to the instrument,
line voltage may be present on the circuit breaker and the input transformer
terminals. The energy available at those points may result in personal injury or
death if contacted.
ADJUSTMENTS
The QS-200S has no adjustments.
TROUBLE ANALYSIS
Trouble shooting the QS-200S will be much easier after obtaining a good basic knowledge of the
instrument.
Trouble analysis should be undertaken only after it is established that a malfunction exists. Check to be
sure that the trouble is not the result of external conditions such as abnormal power line voltages or
broken wire or cables to the input connectors.
If a malfunction exists in the QS-200S, conduct a visual check for possible burned or loose components,
loose connections, or any other condition suggesting a source of trouble.
The printed circuit board is more valuable than any component. To protect the printed
circuit paths when removing resistors, capacitors, etc., cut the components such that one
lead at a time can be removed from the board. When removing integrated circuits and
transistors, cut the leads off where possible and remove the cut leads one at a time.
MAINTENANCE
WARNING
Caution
Page 5
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