ILX Lightwave LDT-5910(B) Manual with schematics request - Page 1
Forum section: electronics / general

author: mimmus78
author_rank: Unknown
timestamp: May 09, 2018, 03:58:13 pm
content: I brought one of this TEC controller at 50 EUR from ebay and I found that the original manual published here:http://www.lightwavestore.com/product_datasheet/OTI-LDC-020C_pdf4.pdfis missing the schematics (pages 61-65) ...Did someone has the original manual with schematics?

author: picburner
author_rank: Frequent Contributor
timestamp: May 15, 2018, 05:10:58 am
content: Even the operator/maintenance manual on sale at a well-known English seller does not have the schematic diagrams....The only hope is in the good heart of someone in the factory who sends you the missing pages...

author: Echo88
author_rank: Frequent Contributor
timestamp: July 11, 2018, 04:17:54 pm
content: I just bought one LDT-5910B which is set to 110V line voltage and the manual is lacking the description how the 3 zero-ohm-jumpers need to be set on the power supply board to change it to 230V line voltage. If anyone owns said device with the jumpers set to 230V: could you please make a picture so i can change those jumpers?

author: mimmus78
author_rank: Unknown
timestamp: July 18, 2018, 04:15:57 pm
content: This is how is set my unit for 230V ... anyway there is a page on the manual for this ...Inviato dal mio ONEPLUS A5010 utilizzando Tapatalk

author: mimmus78
author_rank: Unknown
timestamp: July 18, 2018, 04:18:29 pm
content: My unit has not thermistor current selector switch ... some switch pins are wired to the thermistor port that's a db9 and not binding posts... it seems a user modification but flat cable used inside for connection is very similar to the one used in other places ... don't know.

author: Echo88
author_rank: Frequent Contributor
timestamp: July 18, 2018, 04:49:21 pm
content: Thanks for the pictures, but your LDT-5910 is not identical to my LDT-5910B, were the picture on how to set the jumpers to vary the mains voltage is missing.But i seem to have found the problem on my device: the transformers are defective. After figuring out the schematic of the power supply, desoldering the transformers and supplying the needed voltages i could get it to work for the most part. Im only missing the info which voltages are needed for +UN and -UN which are needed for the TEC-Output-Voltage i presume.

author: mimmus78
author_rank: Unknown
timestamp: July 19, 2018, 10:38:45 am
content: Yes my unit is quite unusual ... it has this modification for thermistor and it has the GPIB interface even if is not the B version.

author: Octane
author_rank: Regular Contributor
timestamp: January 13, 2021, 03:20:50 am
content: Hi,I just got a dead LDT-5910B. It seems that I have a similar issue as Echo88: The fully potted Precision Inc. transformer which is supposed to supply voltage to the 7815 and 7915 is broken. Thus my +15V and -15V rails are dead. The second output which provides about 10VAC for the raw 13VDC output, from which also the +5VDC for the digital section are generated is still working. The second transformer (non-potted) seems fine and provides +UN as +10.7V and -UN as -10.7V (after the FBR, obviously).Does anybody have any information about the transformer? I guess I need to find another 5910B which I can salvage the transformer from, any other ideas?Thanks,MichaelEdit: Got some stuff wrong, corrected it.