Merco ST-1 Service Manual
PARTS & SERVICE for ST-1 Mini Conveyor Toaster
The ST-1 Mini-Conveyor Toaster is engineered for
efficient, dependable service throughout the years.
Like any piece of fine equipment with moving parts
and broad temperature ranges, physical wear takes
its toll. When this happens, the information found in
this manual will prove very helpful. Although the
instructions are easy to follow, all repair procedures
should be carried out by a qualified Merco/Savory
Service Representative.
Description Part # Description Part #
On/Off toggle switch control, 20A 68117 Drive chain assy, 54 links, 208V/240V 12412
Energy saver switch control 14614 Rear shaft assembly 14603
Heater control 120V, upper or lower 21874 Front shaft assembly 14644
Heater control 208V, upper or lower 14702 Front shaft spacers 14606
Heater control 240V, upper or lower 12355 Rear shaft spacers 14762
Conveyor speed control, 120V 12464 Tension adjusting brackets 12508
Conveyor speed control, 208V / 240V 12425 Bearing retainer brackets 12381
Heater control knob 12919 Bearings 22754
Terminal block 21858 Conveyor belt assembly, SS 58 links 14647
Control panel, blank 14765 Gearmotor, 120V 69716
Control panel decal 14763 Gearmotor, 208V/240V 14674
1” adjustable legs 12668 Cooling fan motor, 120V 14618
5’ cord set, 120V, NEMA 5-15P 26047 Cooling fan motor, 208V 14699
5’ cord set, 208V/240V, NEMA 6-15P 26064 Cooling fan motor, 240V 14675
Strain relief bushing 000171 Fan blade, 5” cw 14619
Right side panel 14554 Toast receiving tray/chute 14590
Left side panel 14556 Fan motor mounting bracket 14658
Top cover 14542 Heating element, 120V, 825W 14648
Chimney 14539 Heating element, 208V, 1200W 14694
Bottom cover assembly 14732 Heating element, 240V, 1200W 14673
On/Off energy toggle switch 18209 Lower element assembly, 120V 14707
Reflector/crumb tray assembly 14568 Lower element assembly, 208V 14722
14T sprocket assy.Drive 208/240V 13733 Lower element assembly, 240V 14724
8T sprocket assembly, 120V 30494 Upper element assembly, 120V 14713
20T sprocket assy. drive shaft 120V 14750 Upper element assembly, 208V 14723
12T sprocket assembly, 208V/240V 69787 Upper element assembly, 240V 14725
Drive chain assembly, 57 links, 120V 13301 Lubricant 21720
1200-JDM
07024
ST-1 PARTS REPLACEMENT
INSRUCTIONS
WARNING
DISCONNECT TOASTER FROM
POWER SOURCE
BEFORE ATTEMPTING ANY SER-
VICE PROCEDURES.
General Information
The information on the following pages will
describe how to replace the most common
components of the ST-1 toaster. Though the
instructions are easy to follow, the work should be
done by a qualified service technician. All replacement procedures will first require the removal of
one or both toaster side panels, and top or bottom
covers. IMPORTANT: When removing or replacing
the bottom toaster cover, it is extremely important that it be positioned correctly. The open side
air cooling vent should be facing towards the
front of the unit. This will assure proper air
circulation and toaster performance.
A Panel Removal
1. The right and left side panels are each secured
to the toaster by one sheet metal screw located
at the back of the unit. Remove this screw and
slide
out the panel. When replacing either panel, be
sure that the panel is properly positioned in
the securing track.
2. The top cover is also held in place with one sheet
metal screw. Remove this screw and slide the top
cover towards the back of the toaster. When
replacing the top cover, be sure that it is properly
positioned in the securing tracks.
3. The bottom cover is secured by two sheet metal
screws. Remove these screws and pull towards
the front of the toaster. NOTE PROPER ORIEN-
TATION OF THE OPEN SIDE OF THE AIR
COOLING VENT. This opening must always face
towards the front of the unit to assure proper
toaster performance.
B Main Power On/Off Switch
(Figures 1 & 2)
1. Remove the bottom cover.
2. Disconnect the 2 wires at the on/off switch
terminal ends. Note the correct orientation of the
wires.
3. Remove the rubber on/off switch boot (old style
units) and the black plastic mounting bezel.
4. The on/off switch can now be removed from the
back of the control panel.
5. Reverse this procedure to install a new switch.
(Refer to the wiring diagram)
2
C Conveyor Speed Control/P.C. Board
(Figures 1 & 2)
1. Remove bottom cover.
2. Pull off speed control knob and remove the nut
securing the control board panel. Pull out the control
from the back of the control panel.
3. Cut the wire harness tie and disconnect the 2 wire
leads at the wire connectors.
4. Reverse this procedure to install the new assembly.
4. Disconnect the wires from the energy save switch
terminal ends, noting the proper wire orientation.
5. Install the new switch to the back of the control
panel and secure with the black plastic mounting
bezel and rubber boot.
6. Re-attach wires to the terminal ends.
(Refer to wiring diagram)
7. Replace the upper heater control switch.
D Heater Control Switches
(Figures 1 & 2)
1. Remove bottom cover.
2. Pull off heater control knob to gain access to the 2
slotted screws that secure the control to the control
panel. Remove these 2 screws.
3. Disconnect the wires from the control terminal ends,
noting the proper orientation of the wires.
4. Install the new control securing with the 2 slotted
screws.
5. Re-attach wires to the terminal ends.
(Refer to the wiring diagram)
E Energy Saver Switch
(Figures 1 & 2)
1. Remove bottom cover.
2. On the front of the control panel, unscrew the rubber
switch boot and remove the black plastic mounting
bezel securing the switch to the panel.
3. In order to gain easier access to the back of the
switch, remove the upper heater control, but do not
disconnect the wires.
F Fan / Fan Housing / Fan Motor
(Figure 2)
1. Remove the bottom cover.
2. Rotate Fan Blades which will expose 2 nuts
securing the fan housing to the motor. Remove
these two nuts to remove the housing.
3. To remove the fan motor, but do NOT remove the
2 motor mounting bracket nuts. Slide the motor
until clearance is achieved.
4. Cut the wire harness ties to gain access to the
wire connector. Disconnect the 2 wire leads from
the motor, one at the wire connector and one at
the terminal block.
5. Insert the new motor into the motor mounting
bracket and tighten the 2 motor mounting bracket
nuts.
6. Re-attach the two wire leads, one at the wire
connector and one at the terminal block.
(Refer to wiring diagram)
7. Install fan housing and secure with the 2 nuts.
8. IMPORTANT: BE SURE TO RE-TIE THE WIRE
HARNESS SO THAT THE WIRES DO NOT BLOCK THE
FAN FROM SPINNING FREELY.
3
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