Dickson THDx Manuel - Page 8

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Troubleshooting

Problem

Temperature Pen & Display do not match

Instrument is not responding to key presses

Instrument turns off

Probe exposed to environments exceeding

95%RH for extended period

Alarm symbol is flashing in digital display

Display shows dc and indicator on the left

part of the digital display

Display shows E (lower left of digital display)

Out of calibration or questionable accuracy

Display won't light up

Unit won't work at all

Pen trace too fine or absent

Display shows Err

Display shows Prob

Display shows cold

Display shows frozen

Factory Service & Returns

We recommend that damaged instruments be returned

to our factory for complete repair. Before returning

any instrument or package, please call for a Return

Authorization (RA) number. When calling, please have

the following information available:

P.O. number for out-of-warranty units.

2. Serial number of unit.

The Dickson Warranty

Dickson warrants the TH6 line of instruments will be

free from defects in material and workmanship

for a period of twelve months after

normal use and service

delivery. In the event of a claim under this warranty,

the product or part must be returned to the factory for

repair or replacement (shipping prepaid) with a Return

Authorization Number (See repair information above). It

will be repaired or replaced at Dickson's option without

charge.

Solution

• Check dip switch setting & proper chart

• May also be hysteresis, see page 4, "Pens"

• Need for pen adjustment, see page 4, "Pen Adjust"

• Keypad may be locked, check dip switch #8

• Slower, firmer key presses (may take multiple presses)

• Check AC adapter connection (widen prongs of adapter to

fit together)

• Display may be off, check dip switch #7

• Probe should be dried out under normal ambient conditions –

time required varies on temperature, RH and air flow

• Alarm sounds audibly for 60 seconds if out of range conditions

occur, then indicator will flash until alarm key is depressed and

alarm is reset (depress MIN/MAX keys for information)

• Factory repair is necessary, send to Dickson for repair

• System error or error in calibration, send to Dickson

• Instrument exposed to harsh environments or stressful

conditions, see "Calibration" procedure in manual

• Return to factory for re-calibration

• Check dip switch #7, switch should be off

• Check both dip switch #7 & #8. Both should be off to

allow operation

• Pen may need to be replaced, moistened, or sanded

• Remove pen cap

• Temperature being monitored is too high, see pg. 2

• Temperature being monitored is extremely cold or probe

is disconnected

• Temperature being monitored is too low, see pg. 2

• Reset the unit by shutting it down (unplug the AC adapter and

take the batteries out) then restore power source and turn it on

3. Model number of unit.

4. The problem you're experiencing with unit.

Clearly mark the RA number on the outside of

the package and return the instrument, shipping

prepaid. Delivery will be refused for packages

sent without RA numbers.

This warranty does not cover routine calibration, pen,

chart and battery replacement. The foregoing warranty

under

and remedy are exclusive and in lieu of all other warran-

ties either expressed or implied. Dickson shall not be

liable for consequential or incidental damages resulting

from failure or malfunction of its products. Dickson

makes no warranty for products not manufactured by

it or for any products modified by buyer, or subject to

misuse or neglect.