Lincoln Series 1200 Manuel D’Utilisation

Impinger I -–1000 Series Service Manual - International

Temperature Control Board

Check for 120 VAC input to temperature control

board. If not present, check wiring from fuse holder

to temperature control board. Turn the temperature

adjustment dial to the maximum temperature

position Check for 120 VAC at coil of mercury

contactor(s). Next, short the leads of thermocouple

on the temperature control board, check for 120

VAC at coil of mercury contactor(s). If voltage is not

present, replace temperature control board. If

voltage is present proceed.

Temperature Control

Potentiometer

Potentiometer is 0 to 2.5K ohm. WITH POWER

OFF: remove the leads from the temperature

control board terminals 1, 2, and 3 and measure

ohms from black to white leads. The ohm reading

should be 0 to approximately 2.5K ohms as the dial

Thermocouple Probe

Remove thermocouple leads from the temperature

control board, and measure the millivolt output of

the leads. Refer to chart in adjustment section for

proper millivolt readings.

Mercury Contactor(s)

Check for 120 VAC to the contactor coil. If voltage

is present and contactor will not activate, replace

the contactor(s). Also check each contactor for

proper high voltage input and output.

50 Amp Fuses

If there is no high voltage input to the mercury

contactor(s), check the 50 amp fuses and replace if

necessary.

Heater Elements

Check the Amp. draw on each hot leg for proper

load. Check the specifications plate for rating

information. If the Amp.

draw is low or high, check

the individual elements for opens, shorts, and

proper resistance . To check resistance of the

elements, turn off the power! Remove all leads

from the elements and use an accurate digital

VOM. The element resistance should be as follows:

208V - 9.8 ohms approx. 220V - 10.5 ohms approx.

240V - 13 ohms approx. If all readings are not

correct, replace elements as needed.

Oven heats with switch

off

Mercury Contactor(s)

The mercury contactor has probably malfunctioned

in the closed position. If there is no voltage to the

operating coil, but there is high voltage at the

contactor output, replace the mercury contactor.

Voltage Supply

Check incoming voltage supply at line 1 to neutral.

There should be a voltage reading of 120 VAC. If

not present, check breakers.

3 Amp Fuse

This conveyor fuse is located on the front panel.

Replace if defective.

Fuse Holder

Check and/or Replace.

Conveyor Switch

Same procedure as for fan switch.

Conveyor will not run

(S/N 100-4389)

D. C. Motor Control Board

Check for 120 VAC input to D. C. control board

across L1 and L2. Check the 3 amp fuse on the D.

C. control board. Check for D. C. voltage at

terminal F1 and F2. Voltage should be 10 VDC +

10 steady. If this voltage is not present, replace D.

C. control board. Check for D. C. voltage output to

the motor across terminals A1 and A2 (this voltage

should be approx. 125 VDC at maximum conveyor

motor speed).