Gaymar MEDI-THERM II MTA5900 Series, Руководство по обслуживанию

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Figure 6B—RFU Code 1
TROUBLESHOOTING CHARTS
39
No
Yes
Suspect RT2.
Repair/replace.
Is RT2
actual
temperature between
32°F and 122°F
(0°C and 50°C)
?
Yes
No
Faulty signal lines
between
control/display board
and RT1.
Is it
between
811 and 7355
ohms
?
Yes
Yes
No
No
Suspect RT1.
Repair/replace.
No
Yes
Is RT1
actual
temperature between
32°F and 122°F
(0°C and 50°C)
?
Disconnect connector
P6 from J2 on the
power supply board and
measure resistance
between pins 2 and 9 of
connector P6.
Repair/replace
the
control/display board.
Suspect temperature
measurement
circuitry.
Is it
between
811 and 7355
ohms
?
Repair/replace
the
control/display board.
Suspect controller failure
caused RT1 or RT2 to read
an actual temperature outside
32°F to 122°F (0°C to 50°C)
range.
Faulty signal lines
between
control/display board
and RT2.
Is it
between
811 and 7355
ohms
?
No
Yes
Measure resistance
between pins 23 and 11
of J1 on back of
control/display board.
Disconnect connector P6
from J2 on the power
supply board and
measure resistance
between pins 3 and 5 of
connector P6 at base.
Is it
between
811 and 7355
ohms
?
Run machine. If RFU condition (RFU
code 1) reappears, unplug machine
and measure resistance between pins
10 and 11 of J1 on back of
control/display board.
Insure integrity of the control/display
board to power supply board
connections. Insure integrity of base
to power supply board connections.
RFU CODE 1
Measured values
from RT1 or RT2
are not within
32°F and 122°F
(0°C and 50°C).
SERVICE MANUAL
Medi-Therm II