Lake Shore Model 370 AC Resistance Bridge User’s Manual
Firmware Replacement (Continued)
CAUTION:
The ICs are Electrostatic Discharge Sensitive (ESDS) devices. Wear shock-proof wrist straps
(resistor limited to <5 mA) to prevent injury to service personnel and to avoid inducing an
Electrostatic Discharge (ESD) into the device.
3. Use IC puller to remove existing IC from the socket.
4. Noting orientation of new IC, use an IC insertion tool to place new device into socket.
Typical NOVRAM
DALLAS
xxxxxxxxx
xxxxxxxxx
1
Match notch on
NOVRAM to notch
in socket
1
Match notch on
IC to notch
in socket
Typical IC
Eprom.eps
5.
Follow the top of enclosure
INSTALLATION
procedure in Paragraph 8.8.
8.11 CONNECTOR AND CABLE DEFINITIONS
The SCAN CONTROL, INPUT, REFERENCE, MONITOR, HEATER OUTPUT, ANALOG OUTPUT 1 and 2
(STILL), ALARM RELAYS, and RS-232 (DTE) connectors are defined in Figures 8-5 thru 8-11.
Scan Control.bmp
Pin
Name
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Body
Scan Present
Digital Common
Digital Common
Unused
Analog Common
Analog Common
Analog Common
–15 V
Scan 1
Scan 2
Scan 3
Scan 4
Scan Gain
+5 V
+15 V
Chassis
Signal to Model 370 that a scanner is installed
Common or ground for digital control signals
Common or ground for analog signals
–15 V referenced to scanner analog common
Scan channel select line 1
Scan channel select line 2
Scan channel select line 3
Scan channel select line 4
Selects scanner gain of 1 or 100
+5 V referenced to scanner digital common
+15 V referenced to scanner analog common
(Do Not Use)
Figure 8-5. SCAN CONTROL Connector Details
Service
8-11
