INFICON STC-2002 Thin Film Deposition Controller Operating Manual - Manual (Page 36)

p STC-2002 DEPOSITION CONTROLLER y
SECTION 2.XX e page 34 of 276 ^
Installation/Removal of Sensor Cards, Input Cards, Output Cards: Although other combinations are
possible, the following procedure is recommended for field installations and removals. There are human
safety issues and component damage issues that are addressed by this procedure. Please read this
procedure in its entirety first before commencing the actual work. Return of the unit is preferred.
1. Disconnect all electrical connections to the STC-2002. This includes all I/O connections, Sensor card
connections, RS232 connections, other communications connections, pendent, memory card connections,
ground wires and especially the power cord connection. Ensure that the power cord is removed from the
back panel IEC 320 connector and that the STC-2002 unit is on a properly grounded rubber mat (or
equivalent). The person doing this work should also be properly grounded by wearing a grounding strap.
2. Remove the six screws that secure the top cover. Remove the top cover. Store these items together in
anticipation of reassembly.
3. With the top removed, look inside the STC-2002. Disconnect the power connection between the IEC
320 connector/switch assembly (mounted on the back panel) and power supply. This will be a 3 position
Molex
 type connector housing plugged onto a mating header that is part of the power supply. This will
allow for the removal of the back panel. Next, disconnect the DC power wiring harness from the other end
of the power supply. This will be a 6 position Molex
 type polarized connector housing. Finally,
disconnect the 2 pin connector from the LED display board. The wiring harness is now free to move with
the bus board. Refrain from flexing the wiring harness at the solder points on the bus board.
4. Locate the two screws on each of the side panels that hold the back panel in place. These are located on
the side panels near the back panel (the screws go through the side panels and into the back panel).
5. The back panel/PCB assembly can be pulled straight back away from the STC_2002. The back panel
assembly will include the power switch/receptacle/wire harness assembly, the PCB cards secured to the
back panel, and the bus PCB that interconnects the other ends of the secured PCB cards. Before pulling
the back panel away from the main unit, please note that the PCB that provides the RS232 connection on
the back panel will disconnect from a PCB on standoffs running parallel to the front panel. This connection
will obviously need to be reconnected upon reassembly. This is why the back panel / PCB assembly must
be pulled out straight away from the unit: the header pins may be bent otherwise.
6. With the back panel / printed circuit board assembly on the grounded mat, remove the interconnecting
bus PCB from the secured back panel mounted PCB cards taking care to pull the bus board straight out to
avoid bending header pins. Place the bus PCB on the grounded mat.
7. PCB cards may be added or removed from the back panel at this time. PCB mounting hardware is
removed or added. Securing the PCB cards to the back panel is accomplished by use of the connector
mounting hardware.
8. Carefully align all back panel secured PCB connector headers with the mating socket headers on the bus
PCB. Start alignment at one end of the bus board, holding each back panel secured PCB lightly in place
until all are aligned then press on the bus board such that all bus board connectors are fully engaged with
the mating back panel secured PCBs.
9. Introduce the back panel assembly back into the unit moving it horizontally across the table while
maintaining its orientation such that the back panel remains parallel to the front panel. Ensure that the
power connector harness wires are not pinched or that the insulation on the wires is not damaged. As the
PCB (that provides the RS232 connection on the back panel) nears its mating connection, align the
assemblies such that the header pins correctly engage and insert straight.
10. Secure the back panel assembly to the side panels with the 4 screws previously removed.
11. Check PCB interconnections for bent pins or misalignments. If there are problems, reverse process to
the point needed to correct the problem.
12. Reconnect the switch/IEC wiring assembly connector housing to the power supply header. Reconnect
the DC connector housings to the power supply header (6 positions) and LED display board (2 positions).
The connectors are polarized.
13. Replace the top cover and secure it with the 6 screws.
14. Reconnect the power cord into the IEC connector.
15. Power on the unit.