UVP DE-4 User Manual

off the drawer assembly and set it aside. Lift off the lamp housing to expose the
tube. Carefully grasp both ends and twist it approximately 1/4 turn until it works
free from the sockets. Insert the tube in the reverse fashion, being sure that it
snaps snugly in place with the 1/4 twist. Reassemble the unit in the reverse order.

Jammed Drawer

In the event an EPROM become lodged internally and cannot be removed, the unit
will have to be disassembled to retrieve the EPROM and free the drawer move­ment. To do this and free the drawer, unplug the unit from the AC outlet. Place
the unit upside down on the bench. Push the drawer fully closed. Using a Phillips
head screwdriver, remove the two screws from the end opposite drawer. Then
remove the third screw at the end where the drawer handle is located. This is
accessible through the hole at the bottom of the EPROM Eraser. Carefully lift the
entire bottom assembly off of the lamp assembly and set it aside. Turn the ray
assembly over and observe the location of the EPROM. Readjust the EPROM so
it is not engaging any part of the drawer assembly and slide the drawer out. Re­move the EPROMs from the foam pad.

DE-4 EPROM Erasing System

Operating Instructions

Introduction

Ultraviolet Light

The invisible band of radiation just beyond he violet end of the visible spectrum is
called ultraviolet. In this band is a region called shortwave ultraviolet light, which
includes the wavelength that is instrumental in erasing EPROMs (254nm). The
intensity of this radiant energy or irradiance, as it is now called, at the location of
the EPROM is a function of the distance between the light source and the EPROM
and the geometry of the light. The design of this DE-4 EPROM Erasing System
optimizes all of these elements to give you the best possible performance.

Design

Foam Pad Replacement

If the pad needs replacing, remove the drawer cover by sliding it off the lower
drawer fixture. This will free the drawer completely from the housing so that the
drawer can be removed and the foam pad removed and replaced. To reassemble the
unit, place the drawer back in the lower drawer housing and slide the cover back in
place. Place the drawer assembly back on top of the lamp housing and reinsert the
screws.

Repair/Technical Assistance

Contact UVP’s Customer Service at the offices below with any questions. A Re­turned Goods Authorization (RGA) number must be obtain from UVP prior to re-

turning any products to UVP for repair.

Replacement Parts and Accessories

Product Part Number Complete Assembly

Replacement Tube 34-0003-01 DE-4 115V 95-0095-03
Foam Pad 72-0006-03 DE-4 230V 95-0095-02
UVX Radiometer 97-0015-01 DE-4 100V 95-0095-01
UVX-25 Sensor 97-0016-01
115V Ballast 42-0003-01
215-250 Ballast 42-0004-02

Corporate Headquarters: UVP, LLC, 2066 W. 11th Street, Upland, CA 91786 USA

Tel: [phone] or [phone] • Fax: [phone]

European Office: Ultra-Violet Products Ltd. Unit 1, Trinity Hall Farm Estate, Nuffield

Rd., Cambridge CB4 1TG UK Tel: [phone] • Fax: [phone]

Web Site: www.uvp.com

The DE-4 EPROM Erasing System is designed to provide a safe tool for exposure
of EPROMs to shortwave ultraviolet radiation. The unit incorporates a light-tight
captive drawer. Thus, the unit will not leak any hazardous UV radiation regard­less of the drawer position.

Operating Instructions

This unit is built using a captive drawer feature. The lamp will operate, indepen­dent of the drawer position, until the lamp is turned off.

WARNING: Do not operate continuously to avoid excess temperatures. Turn off
after each use cycle.

Eraser Operation

Plug your eraser into a standard AC outlet and pull out the drawer. Place the
EPROMs on the foam pad. For optimum erase times, use the layout formats of
Figure 1 for the number of EPROMs to be erased. Push the drawer closed until it
snaps. Use Table 1 to establish the erase time for the EPROMs in use. Depress the
red button on the upper portion of the eraser for three to five seconds, then release.
This will light the lamp. You can determine this by observing faint glow of light
through the plastic at the bottom of the lamp housing. If the lamp does not light
the fist time, depress the red button for an additional five seconds. After comple­tion of the erase, turn off the lamp by depressing the black button.

81-0071-01 Rev. F

Figure 1

Page 2

Page 3

Specifications

The DE-4 EPROM Erasing System has the following specifications:

Size: 9”L x 3.7”W x 2.6”H (23 x 9.4 x 6.6 cm )
Weight: 1.5 lbs (0.7 kg )
Tray Size: 2.9” x 2.5” (7.4 x 6.4 cm)
Capacity: 8 (24 pin EPROM)
Power: 100 to 115V, 50 to 60 Hz

215 to 250V, 50 to 60 Hz

Erase Time: See Table 1

Applications

Intensity

Knowing the erase energy from the manufacturer’s literature and the layout pat­tern of the EPROMs in the drawer, refer to Table 1 to obtain the required erase
time. Example: if you have five EPROMs arranged in the drawer per Figure 1,
and their erase energy is 10 W-Sec/cm2, the required time to complete the erasure
is 29 minutes.

For numbers of EPROMs not covered in Figure 1, very close estimates of the
required erase time can be obtained by interpolating between the numbers used in
the Table 1. In the event, the manufacturer’s specified erase energy is not one of
the three listed in Table 1, then the required erase time can be computed in the
following manner.

Suppose the manufacturers specified erase energy is 20 W-Sec/cm2 (Joules/cm2)
and you are erasing one EPROM. On Table 1 you will note that one EPROM

2

requiring 15 W-Sec/cm

erase energy, requires 37 minutes for erasure. To com­pute the erase time, multiply 37 (minutes) by 20 (W-Sec/cm2). This will give you
the erase time (in minutes) required for this new EPROM and any quantity of
EPROMs that will fit within the drawer. In the calculation, it is best to choose the
erase time (in minutes) most closely corresponding to the UV erase energy needed
for the appropriate number of EPROMs you wish to erase at any one time.

Erase time for:

Number 6 W-Sec/cm
of EPROM EPROM EPROM
EPROMs (Minutes) (Minutes) (Minutes)

1 15 25 37
4 16 27 40
5 18 29 42
8 21 34 51

2

10 W-Sec/cm

Table 1

2

15 W-Sec/cm

2

The Model DE-4 EPROM Eraser System produces an intensity of approximately
6800 uW/cm2 at the center of the drawer with the original or new replacement
tube. This intensity varies at different locations over the pad area of the chip
arrangements. Lamp intensity decreases as the lamp ages. A representative inten­sity for a lamp that has been operated for the 1000 hours is 50% of new. This
varies according to the operation cycles and other considerations.

Erase Time

An EPROM requires a given amount of 254nm irradiance for a minimum amount of
time to obtain a complete erasure. In this system, two factors will determine the
erase time. One is the required erase energy of the EPROM itself while the other
is the location of the EPROM in the incidence energy field.

The erase energy is specified by the EPROM manufacturer in Joules/cm2 or Watt­Seconds/cm2 and varies between EPROMs and manufacturers. The specific value
for a given EPROM can be obtained from the manufacturer’s literature.

Maintenance

WARNING: Do not attempt to disassemble this unit while plugged into the AC
outlet. Failure to unplug the unit from the AC outlet while disassembling the unit
will result in an electrical shock hazard.

WARNING: Do not attempt to operate this unit in the disassembled condition.
Operating the unit in the disassembled condition may expose the eyes and skin to
shortwave UV that is harmful to the unprotected eyes and skin.

Tube Replacement

To replace the tube, first unplug the EPROM Eraser from the AC outlet. Turn the
unit upside down on the bench and remove the three screws from the bottom. Lift