Welch Allyn SureTemp 670 Dokumentacja Pobierz pdf (Strona 36)

Technical Manual

5-4 Welch-Allyn, Inc.

70898-0000A

Troubleshooting Table (continued)

SYMPTOM POSSIBLE CAUSE PROCEDURE

Display problems

(continued)

Cracked LCD Inspect LCD for hairline cracks, especially

in corners.

Microprocessor failure Check for improper soldering of pins,

crystal operation on O-scope, proper reset.

No beeper sound Defective horn Replace horn.

Broken connection Check continuity from U1-49 to horn pin 2

and from ground to horn pin 1.

Defective U1 Check for signal with O-scope at U1-49.

Replace microcontroller U1.

No Timer function Defective Timer button

Check for low level (gnd.) signal at U1-26

when timer button S1 is pressed. Replace

button if signal is high.

Broken trace Check for low level (gnd.) signal at U1-26

when timer button S1 is pressed. Replace

Button if signal is high.

No Backlight Defective backlight Check LED D3 and resistor R23.

No /BLGTHCTL signal Check that signal at U1-42 goes low when

unit is in on.

Recalled temperature is

not correct.

Unit switched to Monitor

mode

If unit is in Monitor mode (whether by the

user switch or automatically), the stored

temperature is the last one seen by the

instrument. This is usually lower than the

patient temperature since the probe drops

in temperature after removal from the

patient.

Probe: Wrong type

displayed

Missing Vcc power to

R10 and/or R11

With no probe installed, check that probe

connector pins J1-B and E are both pulled

high when any function is active (recall or

timer).

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 48 49

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Welch Allyn SureTemp 670 Dokumentacja Strona 36

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