Welch Allyn SureTemp 670 Especificações descarregar pdf (Página 35)

Troubleshooting

SureTemp

Model 678/SureTemp

Model 679 5-3

Troubleshooting Table

SYMPTOM POSSIBLE CAUSE PROCEDURE

No operation Dead batteries, no batteries,

battery missing, battery

incorrectly installed

Refer to Battery Removal and

Replacement on page 2-2. Check

that all batteries are installed in

proper direction.

Reset electronics (see Instrument

Reset/Self Tests on page 1-3).

If battery voltage is within

specifications, refer to Biotech

Mode on page 1-7 and enter

Biotech mode to measure battery

voltage as seen by electronics.

Broken battery wire Open instrument case, install

batteries, check for voltage on

main PCB at battery wire

connections.

Short circuit preventing

operation

Remove batteries, press mode

button 5 seconds, set DMM to

Ohms, measure resistance of

electronics at battery contacts (“+”

to bottom right corner, “-” to top left

corner). Resistance should climb

to more than 2 Megohms as C25

charges.

Failed component Check oscillator at U1-7 for 4.91

MHz sine wave. If not present,

suspect X1 or U1.

Display problems LCD frame loose Check that all 4 plastic hooks for

the LCD frame are tight and not

broken. The frame should not be

lifting off of the PCB.

Dirty LCD elastomeric

conductor strips

Have a new LCD frame handy.

Remove old one by unlatching

plastic hooks. Clean LCD

elastomeric strips, LCD glass

contacts, and PCB contacts with

lint proof cloth dampened with

alcohol.

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Welch Allyn SureTemp 670 Especificações Página 35

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