Service manual

30 70304901
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
Micro Display Control (MDC) Troubleshooting
Control Has No Display
TMB1977S
PRIMARY
FUSE
AGC-2A
250V
SECONDARY
FUSE
MDL-3.5A
250V
N
DOOR
SWITCH
WHT
CHASSIS GROUND
LINT
DRAWER
SWITCH
CABINET
LIMIT
THERMOSTAT
AIR FLOW
SWITCH
BLK
L1
RED
LT. BLU
SERVICE
CONNECTION
TB1
BLK
RED
RED/WHT
N.O.
COM COM
N.O.
BRN/RED
ORG/BRN
COM
N.O.
N.C.
1
2
1
2
BLK
THERMISTOR
RED/BLU
WHT
RED/WHT
RED/BLK
WHT/VLT
RED/BLK
RED/BLK
RED
WHT/BLU
SECONDARY
FUSE
1.25 T
250V
RED
RED
WHT
3
4
GRN/YEL
WHT
8910
H4
L2
24V 3.5A
120V
24V
1.5A
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
5123 86411109712
COIN DROPS
H5
24Vac
H1-4
12 3 456
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
897 45623
1
2
3
4
5
6
7
TMB1977S