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Micro Display Control Troubleshooting
Unit Will Not Heat – Steam
TMB1772S
M
FAN MOTOR
CENTRIFUGAL
SWITCH
WHT
CHASSIS GROUND
WHT
AIR FLOW
SWITCH
BRN/RED
WHT
ORG/BRN
COM
N.O.
ORG
BRN
ORG/ WHT
WHT/
BRN
BRN/WHT
3
5
N.C.
BLK
THERMISTOR
BA
M
7
4
RED/BLK
WHT/VLT
WHT
RED/BLK
RED/BLK
RED
WHT/BLU
WHT
GRN/YEL
WHT
1
2
3
4
5
6
7
8
9
10
WHT
WHT
THERMISTOR
BLK
WHT
H4
025 & 030 MODELS
035 MODELS
CABINET
LIMIT
THERMOSTAT
STOVE
LIMIT
THERMOSTAT
VLT
VLT/WHT
WHT/BLK
STEAM
VALVE
5
TEMP. REGULATING
HEAT RELAY
CIRCUIT CONTROLS
32
1
5
FS-2
H2-1
4N25
24Vac Ret
24Vac
MACHINE RUNNING
H6
3
APPLICATION DETAIL
SEE VEND
H5
7
468
1
2
91
0
1
1
COIN DROPS
H1-4
H1-2
2
16
5
4
6
7
Vmax=28Vdc
Imax=5ma
H3
5
4
3
HEAT RELAY
MOTOR RELAY
START PULSE INPUT
AVAILABLE OUTPUT
TIME 20msec MIN.
Iin= 3-30ma
H3-1 & H3-2
OPTO OFF WHEN
H3-3 & H3-4
MDC CONTROL
120Vac - 6.8K ohm 5 watt
24Vac - WIRE JUMPER
240Vac - 13.6K ohm 10 watt
JUMPER H2-2 TO H2-5 AS FOLLOWS:
VOLTAGE CONFIGURATION INPUT
H2-2
H2-5
SUPPLY
POWER
CONTROL
CLOSED & SWITCH IS PRESSED
RELAY ONLY WHEN DOOR IS
CONTROL TO TURN ON MOTOR
DOOR SENSING CIRCUIT ALLOWS
24Vac Ret
24VAC
H1-1
H1-3
9
H4
10
6
7
8
1/4 watt
1
2
100 OHM
H11L1
FS-1
H2-4
H2-3
Door Sense Ret
H2-6
32
41
1
7
8
46
10
12
13
5
2
3
11
9
T
M
B
1
772S