iFixit - Answers With Device "Analytical Instruments"

Agilent Chromatography: Mensaje FATAL ERROR en cromatógrafo HP 6890 SERIES

Tue, 30 Sep 2025 11:18:50 -0700

Buenos días, al llegar hoy a mi laboratorio (química analítica de la Universidad de Valladolid) el cromatógrafo de GC-FID, me he encontrado con este mensaje: FATAL ERROR: 03.07 Illegal Instruction address: $00004C02. A qué puede deberse? Muchas gracias de antemano. Saludo.s

⟐ Answered septiembre 30, 2025 at 11:18 GMT-7

Chromatography: Autosampler Triplus AS marca Thermo Scientific

Wed, 17 Sep 2025 14:20:43 -0700

Hola!! En el laboratorio donde trabajo, hay dos cromatografos gaseosos que dependen de un autosampler marca thermo scientific, modelo trilpus AS. Este ultimo ha empezado a tener fallas en su funcionamiento y desde el servicio técnico me dicen que se encuentra obsoleto y hay que cambiarlo por uno nuevo. Me comentan que es la plaqueta y no hay repuesto. Que me recomiendan hacer? Cuentan con el plano del equipo para pasarselo al personal de elelctrónica?

⟐ Answered septiembre 17, 2025 at 14:20 GMT-7

Spectrometer: Procedure to replace electrode sharpener's holder of Spectroil q120's

Fri, 05 Jul 2024 14:41:46 -0700

How to replace graphite electrode sharpener's blade holder of Spectroil q120' graphite electrode sharpener

⟐ Edited julio 05, 2024 at 14:41 GMT-7

Colorimeter: Colorie meter ci not setting zero

Fri, 24 Mar 2023 03:50:26 -0700

My colorie meter not settig zero nor giving results

pH Meter: Circuit Repair - 44 pin Microcontroller Expected Heat Output?

Wed, 01 Jun 2022 12:28:11 -0700

I am working on a Bluelab Guardian a TDS and PH monitor for aquariums and hydroponics. Total device power is 5v 1 amp. I suspect the previous owner hooked it to the wrong power supply and fried it. No response when supplying the correct 5v 1a

No visible damage on the PCB to make things easy. Many parts of the circuit have active voltage when plugged in which gives me hope it's not a total loss.

While checking the board with power supplied I noticed that the main 44 pin Microcontroller was getting quite hot - measured as high as 170F which seems high to me for such a basic chip.

This chip's model number is "PIC18F2423" - and trying to search through the documentation I couldn't seem to find anything about expected operation temperature so was hoping someone with general knowledge of basic chips like this would have an idea if that level of heat output might be an indication that it's fried. Any thoughts?

Since it stores the programming, if it's dead then there's nothing else I'd be able to do with this circuit so this seemed a reasonable place to start.

While investigating the circuit I did find a DC to DC converter which seems to be dead - has 5v coming in and no output. It's a 4 pin model with no "enable" pin so I believe I should have voltage out. I can definitely replace it just don't want to start swapping components throwing good money after bad if there's a chance the main microchip is fried.

Any advice or suggestions appreciated. Photos of the circuit attached.

⟐ Commented junio 01, 2022 at 12:28 GMT-7

Spectrometer: We have a Model 485 Spectroscope

Mon, 27 Jul 2020 12:00:43 -0700

GIA is unable to repair (calibrate) this Model 485 due to obsolete parts.

Can IFIXIT repair this model?