1. Manuals
  2. Brands
  3. Lindos Manuals
  4. Measuring Instruments
  5. LA100
  6. Application note

Lindos LA100 Application Note

Fitting a backlit display
Hide thumbs Also See for LA100:
1
2
3
4
5
Table of Contents

Advertisement

Quick Links

Download this manual
LA100 Application Note 16
Fitting a Backlit Display
Since June 1993 new LA100 Audio Analysers have been supplied with high contrast
backlit displays. An upgrade kit (order code BKLU) is available so that existing users can
take advantage of this improvement. Units may also be returned to the factory to be
upgraded (order code BKLF).

Overview

The modifications for an LA101 are the same as for an LA102. To carry them out takes
about 2 hours for an LA100 (i.e. changing 2 displays). No special tools are required. The
main steps are:

1. Dismantling

The procedure for a single unit is described below. You are strongly advised to read
through this entire document before commencing any work. Please telephone Lindos if
you have any difficulties. Note that all memory contents (test results, tolerance and
sequence definitions, configurations) will be lost.
Any tolerance definitions can be printed by entering the tolerance editor (press
[ON/OFF][1] ) and then pressing [*][PRINT]. LA102 configurations can be printed by
entering the configuration menu (press [ON/OFF][2] ) and then pressing [*][PRINT].
Results can be printed by first putting the results into memory 0 if necessary, and then
pressing [*][PRINT].

Upgrade Kit

Check that your upgrade kit contains the following parts:
2 x LCD Displays
8 x screws
2 x 6R8 resistors
4 x diodes 11DQ03 (2 long + 2 pre-formed)

Safety Precautions

Unplug the unit from the mains supply before carrying out any modification.
The LCD displays are static sensitive when unconnected and should be handled
appropriately.
Dismantling
Unplug all cables to external equipment.
Remove the covers, and if the unit is a LA100R, separate the LA101 and LA102 by
undoing the 4 coupling bolts.
2 x mains transformers
2 x wire links
2 x 14cm Kynar wire
Tel: +44 (0)1394 380307
Fax: +44 (0)1394 385156
E-mail: info@lindos.co.uk
Lindos Electronics, Saddlemakers Lane
Melton, Woodbridge, Suffolk, IP12 1PP, UK
2 x bridge rectifiers
8 x nylon washers
2 x 26 way connectors
Copyright Lindos Electronics

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LA100 and is the answer not in the manual?

Questions and answers

Related Manuals for Lindos LA100

Summary of Contents for Lindos LA100

  • Page 1 (order code BKLF). Overview The modifications for an LA101 are the same as for an LA102. To carry them out takes about 2 hours for an LA100 (i.e. changing 2 displays). No special tools are required. The main steps are: 1. Dismantling 2.
  • Page 2 PCB. Break these connections. There are various diode techniques that can be used. Careful use of a scalpel is wire link to satisfactory, as is careful use of a small end mill on a PL1 pin 25 bench drill. Copyright Lindos Electronics...
  • Page 3 - Live to chassis and neutral to chassis should be open circuit.* - Chassis to each end of D10 should be open circuit. - Cathode of D10 to PL1 pin 25 should be 6R8. - PL1 pin 25 to PL1 pin 26 should be about 55kW. Copyright Lindos Electronics...
  • Page 4 (ie 4½-5½ hours in total). The time taken to fully charge a flat battery has gone up from 24 hours to 36 hours. If you have no other use for the old display module, please return it to Lindos. Technical data The backlight configuration is shown below, and this circuit should be compared with that of the original circuit in the LA100 manual fourth edition, page 177.
  • Page 5 D10 11DQO3 BATT Back light LED array Each LED Vf=2.1V typ; 2.5V max b c e If=20mA typ; 30mA max D11 11DQO3 8 chains in parallel BC107 IC20 LM2391 viaPL1 1,2 BKUP 2mA TYP 100μA MAX Andy Barkley Copyright Lindos Electronics...

This manual is also suitable for:

La100rLa102La101

Table of Contents