Lake Shore Model 340 Temperature Controller User’s Manual
11-2
Service
11.2.1 Identification of Electrostatic Discharge Sensitive Components
The various symbols used in the industry to label components as ESDS are shown as follows:
11.2.2 Handling of Electrostatic Discharge Sensitive Components
In general, all precautions necessary to ensure prevention of damage to ESDS components should be
observed before attempting installation. This means that the device and everything that contacts it must be
brought to ground potential by providing a conductive surface and discharge paths. As a minimum, the
following precautions must be observed:
1. De-energize or disconnect all power and signal sources and loads used with controller.
2. Place controller on a grounded conductive work surface.
3. Ground technician through a conductive wrist strap (or other device) using 1 M
Ω
series resistor.
4. Ground any tools, such as soldering equipment, that will contact controller. Contact with operator’s hands
provides a sufficient ground for tools that are otherwise electrically isolated.
5. When ESDS devices and assemblies are not in controller, they must be on a conductive work surface or
in a conductive container. When a device or assembly is inserted or removed from a container, operator
must maintain contact with conductive portion of container. Only use plastic bags approved for storage of
ESD material.
6. Do not handle ESDS devices unnecessarily or remove them from packaging until actually used or tested.
11.3 GENERAL MAINTENANCE
If there is no power, ensure you are plugged into a live outlet and that both ends of the power cord are
plugged in. Next check the fuse. Remove line cord then place a small slotted screwdriver in the slot of the
small door at the rear of the controller to gain access to the fuse. See Figure 11-1. For 100/120 V operation,
the fuse rating is 2 A and the fuse type is 3AG Slow Blow. For 220/240 V operation, the fuse rating is 1 A and
the fuse type is 5
×
20 mm T. Test the fuse with an ohmmeter; do not rely on visual inspection of the fuse.
Clean the Model 340 periodically to remove dust, grease and other contaminants. Use the procedure below:
1. Clean front and back panels and case with soft cloth dampened with mild detergent and water solution.
NOTE:
Do
not
use aromatic hydrocarbons or chlorinated solvents to clean the Model 340. They may
react with the plastic materials used in the controller or the silk screen printing on the back panel.
2. Clean surface of printed circuit boards (PCBs) using clean, dry air at low pressure.
11.4 REAR PANEL CONNECTOR DEFINITIONS
The Serial I/O, Digital I/O, Relays, Analog Outputs,
Sensor Inputs, and Heater Output connectors are
defined in Figures 11-1 through 11-6 respectively.
Figure 11-1. SERIAL I/O RJ-11 Rear Panel Connector Details
6
5
4
3
2
1
SERIAL I/O
RJ-11 Receptacle
PIN DESCRIPTION
1
2
3
4
5
6
Serial In (RxD)
Serial In (RxD)
Serial Ground
Serial Ground
Serial Out (TxD)
Serial Out (TxD)