106
70291301
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Micro Display Control Troubleshooting
Unit Will Not Heat – Gas
TMB1866S
M
FAN MOTOR
CENTRIFUGAL
SWITCH
WHT
CHASSIS GROUND
WHT
AIR FLOW
SWITCH
5
RUN
MAIN 2
MAIN 1
4
FAN
MOTOR
THERM
PROT.
AUX
1
BRN/RED
WHT
ORG/BRN
COM
N.O.
ORG
BRN
ORG/ WHT
WHT/
BRN
BRN/WHT
3
5
3
GRY/BLK
BLK
M
5
8
LT. BLU
N.C.
BLK
THERMISTOR
BA
M
7
4
RED/BLK
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
24Vac Ret
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
START PULSE INPUT
MACHINE RUNNING
AVAILABLE OUTPUT
SEE VEND
APPLICATION DETAIL
H2-2
H2-1
FS-2
H1-2
5
1
2
38
6
41
1
10
9
71
2
COIN DROPS
H5
24Vac
H1-4
12
3
4
5
6
7
H6
24Vac Ret
Imax=5ma
H3-3 & H3-4
Vmax=28Vdc
OPTO OFF WHEN
HEAT RELAY
MOTOR RELAY
H2-5
DOOR SENSING CIRCUIT ALLOWS
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
240Vac - 13.6K ohm 10 watt
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
MDC CONTROL
CONTROL
POWER
SUPPLY
24VAC
H1-1
H1-3
H11L1
4
6
5
3
21
H3
100 OHM
1/4 watt
4N25
H2-4
H2-3
FS-1
1
H2-6
Door Sense Ret
CIRCUIT CONTROLS
HEAT RELAY
TEMP. REGULATING
10
H4
8
9
74
5
62
3
1
VALV
3
GND
3
GND
4
2
GND
TH
CABINET
LIMIT
THERMOSTAT
STOVE
LIMIT
THERMOSTAT 1
ICM
IGN
VLT
VLT
STOVE
LIMIT
THERMOSTAT 2
VLT/WHT
WHT/
BLK
WHT
GAS VALVE
FIRST COIL
SECOND COIL
GRN/YEL
WHT/VLT
WHT
1
2
3
4
6
8
10
12
14
11
13
9
15
17
16
7
5