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Lake Shore Model 330 Autotuning Temperature Controller User's Manual
5.6
TOP OF ENCLOSURE REMOVE AND REPLACE PROCEDURE
WARNING: To avoid potentially lethal shocks, turn off controller and disconnect it from AC power line
before performing this procedure. Only qualified personnel should perform this procedure.
REMOVE TOP
1. Turn off the controller and disconnect the line cord from rear of controller.
2. Use Phillips screwdriver to remove 6 screws; 3 on top of each side of the controller.
3. Slide the top up and off.
REPLACE TOP
4. Replace the top enclosure.
5. Use Phillips screwdriver to replace 6 screws; 3 on top of each side of the controller.
6. Reconnect power cord to rear of controller and set power switch to on.
5.7
OPERATING SOFTWARE EPROM AND PRECISION OPTION NOVRAM REPLACEMENT
The operating software for the Model 330 is contained on two Erasable Programmable Read Only Memory
(EPROM) Integrated Circuits (ICs). The reference designator for the master EPROM is U11 (DC.HEX) and the
slave is U16 (SV.HEX). The optional Precision Option is provided on a Non-Volatile Ram Access Memory
(NOVRAM) IC. See Figure 5-9 for locations of these ICs. Use the procedure below to replace either one or
both existing software EPROMs or the NOVRAM.
CAUTION: The EPROM and NOVRAM 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.
1. Follow the REMOVE TOP procedure in Paragraph 5.6.
2. Locate master software EPROM U11 (DC.HEX), slave EPROM U16 (SV.HEX), or Precision Option
NOVRAM (U12) on the main circuit board. Note orientation of existing IC. See Figure 5-9.
3. Use IC puller to remove existing EPROM(s)/NOVRAM from socket.
4. Note orientation of new EPROM(s)/NOVRAM. Use IC insertion tool to place new device(s) into socket.
Match notch on
EPROM to notch
in socket
5. Follow the REPLACE TOP procedure in Paragraph 5.6.
6. Proceed to Paragraph 2.12 and follow the power up sequence.
Service & Calibration
XX HEX
DATE
1
Typical EPROM
Match notch on
NOVRAM to
1
notch in socket
Typical NOVRAM
DALLAS
xxxxxxxxx
xxxxxxxxx
5-5
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