Diamond CM1529/N User manual

08/2021
Mod: CM1529/N
Production code: MJ26A6053AT

1. Precaution
2. Product Specification
3. Disassembly and Reassembly
4. Troubleshooting
5. PCB Diagrams
6. Wiring Diagrams
MODEL : CM1529/N

3
1. Precaution

4
1. Precaution
Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use,
repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially
lethal high voltages and currents.
1-1 Safety precautions ( )
1. All repairs should be done in accordance with the
procedures described in this manual.
2. Microwave emission check should be performed to
prior to servicing if the oven is operative.
3. If the oven operates with the door open :Instruct
the user not to operate the oven and contact
the manufacturer and the center for devices and
radiological health immediately.
4. Notify the Central Service Center if the microwave
leakage exceeds 5 mW/cm2.
5. Check all grounds.
6. Do not power the MWO from a “2-prong” AC cord.
Be sure that all of the built-in protective devices are
replaced. Restore any missing protective shields.
7. When reinstalling the chassis and its assemblies,
be sure to restore all protective devices, including:
nonmetallic control knobs and compartment covers.
8. Make sure that there are no cabinet openings
through which people --particularly children--might
insert objects and contact dangerous voltages.
Examples: Lamp hole,ventilation slots.
9. Inform the manufacturer of any oven foundto have
emission in excess of 5 mW/cm2 ,Make repairs to
bring the unit into compliance at no cost to owner
and try to determine cause. Instruct owner not to use
oven until it has been brought into compliance.
CENTRAL SERVICE CENTER
10. Service technicians should remove their watches
while repairing an MWO.
11. To avoid any possible radiation hazard,replace parts
in accordance with the wiring diagram. Also, use
only the exact replacements for the following parts:
Primary and secondary interlock switches, interlock
monitor switch.
12. If the fuse is blown by the Interlock Monitor Switch:
Replace all of the following at the same time:
Primary, door sensing switch and power relay, as
well as the Interlock Monitor Switch. The correct
adjustment of these switches is described elsewhere
in this manual. Make sure that the fuse has the
correct rating for the particular model being repaired.
13. Design Alteration Warning: Use exact replacement
parts only, i.e.,only those that are specied in
thedrawings and parts lists of this manual. This
is especially important for the Interlock switches,
described above. Never alter or add to the
mechanical or electrical design of the MWO.
Any design changes or additions will void the
manufacturer’s warranty. Always unplug the unit’s
AC power cord from the AC power source before
attempting to remove or reinstall any component or
assembly.
14. Always unplug the unit’s AC power cord from the
AC power source before attempting to remove or
reinstall any component or assembly.
15. Never defeat any of the B+ voltage interlocks. Do not
apply AC power to the unit (or any of its assemblies)
unless all solid-state heat sinks are correctly
installed.
16. Some semiconductor (“solid state”) devices
are easily damaged by static electricity. Such
components are called Electrostatically Sensitive
Devices (ESDs). Examples include integrated
circuits and eld-effect transistors. Immediately
before handling any semiconductor components or
assemblies, drain the electrostatic charge from your
body by touching a known earth ground.
17. Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting the
positive lead; always remove the instrument’s ground
lead last.
18. When checking the continuity of the witches or
transformer, always make sure that the power is
OFF, and one of the lead wires is disconnected.
19. Components that are critical for safety are indicated
in the circuit diagram by shading, or .
20. Use replacement components that have the same
ratings, especially for ame resistance and dielectric
strength specications. A replacement part that does
not have the same safety characteristics as the
original might create shock, re or other hazards.
NOTE : Connect the oven to a 20A. When
connecting the oven to a 15A,make sure that circuit
breaker can operate.

5
1. Precaution
1-2 Special High Voltage Precautions
1. High Voltage Warning Do not attempt to measure any of
the high voltages --this includes the lament voltage of the
magnetron. High voltage is present during any cook cycle.
Before touching any components or wiring, always unplug
the oven and discharge the high voltage capacitor (See
Figure 1-1)
2. The high-voltage capacitor remains charged about 30
seconds after disconnection. Short the negative terminal
of the high-voltage capacitor to to the oven chassis. (Use a
screwdriver.)
3. High voltage is maintained within specied limits by close-
tolerance, safety-related components and adjustments. If
the high voltage exceeds the specied limits, check each
of the special components.
Note : Touch chassis side first then short
to the high voltage capacitor terminal
by using a screwdriver.
H.V.Capacitors
Negative Terminal
Screwdriver
PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH
VOLTAGE TRANSFORMER secondary and lament terminals. It is extremely dangerous to work on or
near these circuits with the oven energized.
DO NOT measure the voltage in the high voltage circuit including lament voltage of magnetron.
PRECAUTION
Servicemen should remove their watches whenever working close to or replacing the magnetron.
PRECAUTION
Never touch any circuit wiring with your hand nor with uninsulated tool during operation.

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2-2 Table of Specications
Items
Model
Model Basic Model New
Model
CM1929/XEU
CM1529-1/XEU
CM1029/XEU
MJ26A6093AT/EU
MJ26A6053AT/EU
MJ26A6013AT/EU
Power Source 230-240V ~ 50Hz 230-240V ~ 50Hz
Power
Consumption Microwave
CM1929/XEU : 13A
CM1529-1/XEU : 12.7A
CM1029/XEU : 1700W
MJ26A6093AT/EU : 13A
MJ26A6053AT/EU : 12.7A
MJ26A6013AT/EU : 1700W
Output Power
CM1929/XEU 240V : 1850W
230V : 1780W
MJ26A6093AT/EU 240V : 1850W
230V : 1780W
CM1529-1/XEU 240V : 1500W
230V : 1450W
MJ26A6053AT/EU 240V : 1500W
230V : 1450W
CM1029/XEU 1000W MJ26A6013AT/EU 1000W
Operating Frequency 2450MHz 2450MHz
Dimensions
(W x H x D)
Outside 464 x 368 x 557mm 464 x 368 x 557mm
Oven Cavity 370 x 190 x 370mm 370 x 190 x 370mm
Volume 26Liter 26Liter
Weight Net
CM1929/XEU 32Kg MJ26A6093AT/EU 33.1Kg
CM1529-1/XEU 32Kg MJ26A6053AT/EU 33.1Kg
CM1029/XEU 26.5Kg MJ26A6013AT/EU 26.5Kg
Export zone UK UK
2. Specications
2-1 Features
Product Features
- Heavy Duty Commercial Microwave Oven.
- Mechanical Dial Control.
- Top Feeding Microwave Distribution.
- Easy to VFD Display.
- All Stainless Steel for inside & Outside for Hygiene & Durabillty.

7
3. Disassembly and Reassembly
3-1 Replacement of Magnetron
Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which
are contained in one assembly)
Parts Explaination Photo Explaination
Magnetron,
Motor
Assembly
and Lamp
Duct-MGT-L
Nut-Flange Duct-Fan
Duct-MGT-R
Magnetron
1. Remove the outer panel.
NOTE : Before servicing, make
sure to discharge electric charge
remaining on the high voltage
capacitors or wait for more than 5
min.
2. Remove the back cover.
3. Disconnect all leadwires from the
magnetron.
4. Remove screws securing the duct-
MGT and duct-fan.
5. Remove the nut-anges securing
the magnetron by using a box
wrench.
6. Take out the magnetron very
carefully.
NOTE1: When removing the magnetron, make sure that its antenna does not hit any adjacent parts, or it may be
damaged.
NOTE2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct position and
make sure the gasket is in good condition.
3-2 Replacement of High Voltage Tranformer
Parts Explaination Photo Explaination
HVT
LVT
H. V. Trans
4 Mounting Bolts
1. Discharge the high voltage capacitor.
2. Disconnect all the leads.
3. Remove the mounting bolits securinh the HVT.
4. Reconnect the leads correctly and rmly.

8
3. Disassembly and Reassembly
3-3 Replacement of Door Assembly
Explanation Photo
Upper Hinge
Lower Hinge
Spring-Key
2 screws securing
Door Handle
Key-Door
Pin-Key
Screen B
Door C
Door E Ass'y
Decoration Door
Decoration Door Cover
Door Handle
Door Handle Cover
Parts Explaination
Door
Assembly
NOTE : Be sure to wear gloves when you disassemble or assemble the parts.
1. Remove hex bolts securing the upper hinge and lower hinge. Then remove the door
assembly.
2. Insert the at screwdriver or thin metal plate into the gap between the door-E and door-C to
remove Door-C from the door assembly.
3. Remove 2screws securing the Door-Handle.
4. Unbend the 6 metal tabs around the trim of Decoration Door Cover.
5. Remove 3 screws securing the Door-E Assy.
6. Remove upper hinge and lower hinge.
7. Remove Decoration Door, Screen-B, Key-Door, Spring-Key, Pin-Key as needed.
Door Handle
1. Remove hex bolts securing the upper hinge and lower hinge.Then remove the door assembly.
2. Insert the at screwdriver or thin metal plate into the gap between the door-E and door-C to
remove Door-C from the door assembly.
NOTE : Be careful when handling Door-C as is fragile.
NOTE : The thickness of the atscrewdriver or thin metal plate inserted into the gap should be
0.5mm or less.
3. Remove 2 screws securing the Door Handle to the Door-E Assy.
4. Unbend the 2 metal tabs at both ends of the Door Handle to remove the Door Handle Cover
from Door handle.
Reassembly
Test
1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of
the oven face plate by moving the upper hinge and lower hinge in the direction necessary for
proper alignment.
2. Adjust so that the door has no play between the inner door surface and oven front surface.
If the door assembly is not mounted properly, microwave energy may leak from the space
between the door and oven.
3. Do the microwave leakage test.

9
3. Disassembly and Reassembly
3-4 Replacement of Fuse and H.V.Fuse
Parts Explaination Photo Explaination
Fuse,
H.V Fuse
H.V.FUSE
10A FUSE
1.6A FUSE
1. Disconnect the oven from the power source.
2. Remove defective fuse from Noise lter.
3. When replacing the fuse, besure to use an exact
replacement part. If new fuse blows out again after
replacement, check the primary interlock switch,door
sensing switch and interlock monitor switch.
4. When the above three switches operate properly,
check if any other part such as the control circuit
board, fan motor or high voltage trans former is
defective.
3-5 Replacement of Drive Motor & Ass’y Stirrier
Parts Explaination Photo Explaination
Assy
Stirrer
To remove Ass'y Stirrer Cover: Hold
side stoppers of ceiling cover with both
hands and pull them in and down.
1. Remove a screw securing the drive motor.
2. Open the door.
3. Hold side stoppers of ceiling cover (Ass’y Stirrer
Cover) with both hands and pull them in and down.
4. Take the ceiling cover out of the oven cavity.
5. Remove plastic clips securing the Ass’y Stirrer.
Drive
Motor
Screws
Drive Motor
Assy Stirrer
Plastic Clips
Assy Stirrer Cover
1. Remove outer panel and back-cover.
2. Disconnect all the lead wires from the
drive motor.
3. Remove a screw securing the drive
motor.
4. When replacing the drive motor, be sure
to remount it in the correct position with
the coupler.
5. Connect all the leads to the drive motor.
6. Screw the drive motor to the bracket
motor with a screw driver.

10
3. Disassembly and Reassembly
3-6 Replacement of Control Circuit Box Assy and P.C.Board
Parts Explanation Photo Explanation
Control Box
Assembly
1. Be sure to discharge any static
electric charge built up on your
body and avoid touching the
touch control circuitry
2. Remove 3 screws securing the
Control Box Ass’y to the oven
cavity
3. Disconnect all the lead wires,
connectors and ground taping
from the main control circuit
board (PCB1)
4. Remove Control Box Ass’y
5. Remove 2 lead wires the Control
Box Assembly

11
3. Disassembly and Reassembly
Parts Explanation Photo Explanation
Control Box
Assembly
6. Remove 5 screws securing the
Control Box Assembly
3-6 Replacement of Control Circuit Box Assy and P.C.Board (Continued)

12
3. Disassembly and Reassembly
Parts Explanation Photo Explanation
P C Board
1. Remove all lead wires securing
the P C Board
2. Remove 4 screws securing the
P C Board
3-6 Replacement of Control Circuit Box Assy and P.C.Board (Continued)

13
3. Disassembly and Reassembly
3-7 Replacement of Fan Motor
Parts Explaination Photo Explaination
Fan Motor
Ventilation Motor
C-Film
Supporter-Fan-Mount
Duct-Fan
1. Remove the outerpanel and back-cover.
2. Discharge the high voltage capacitor.
3. Remove all the lead wires from Magnetron
and High Voltage Capacitor.
4. Remove 2 screws securing the duct fan.
5. Remove 2 screws securing the Supporter-
Fan Mount.
6. Lift the Ventilation Motor Ass’y slightly left
upward and pull it out.
7. Remove lead wires and connectors.
8. Remove a screw securing the C-Film to
the Supporter-Fan-Mount.
9. Turn the fanmotor ass’y over soth at the
bracket side is up.
10. Remove 2 screws securing the Ventilation
Motor.
3-8 Replacement of Tray
Parts Explaination Photo Explaination
Assy
Stirrer
Tray
1. Open the door.
2. Remove the tray by inserting a thin metal tool into the gap
between the oven wall and the tray silicon cover.
3. Insert the new tray by tilting it across the oven cavity.
4. Firstly fix the front part (refers to the place where the silicon
cover is thinner than the other 3 edges) and then place the
back ward part carefully and firmly.
NOTE : Be careful when you handle the tray since it is fragle.

14
3. Disassembly and Reassembly
3-10 Replacement of Air Filter
Parts Explaination Photo Explaination
Air Filter
Plastic Spacer Pins
1. Pull out the spacer pins at both ends of the Air Filter.
Then the locking clamps inside are released.
2. Lift the Air Filter off the post carefully.
NOTE : Spacer pins are not detachable from the Air
Filter.
3-11 Replacement High Voltage Capacitor
Parts Explaination Photo Explaination
High
Voltage
Capacitor
H.V.Capacitor
NOTE : It is not necessary to remove
Magnetron in order to remove HVC.
1. Remove the outer panel and back cover.
2. Discharge HVT wire and H.V.Fuse
3. Remove HVT wire and H.V.Fuse.
4. Remove screw securing HVC bracket.
3-12 Replacement of Assy Holder
Parts Explaination Photo Explaination
Assy
Holder
1. Remove the Outer Panel and Back Cover.
2. Remove Screw securing Bracket Noise
Filter.
3. Remove 2 Screws securing Noise Filter
and Power Cord.
4. Remove screw securing Power cord grond
wire.

CODE CAUSE CORRECTIONS
E1 1. Improper input power freqency.
2. Defective Ass’y Main P.C.B
Check if power frequency is 50Hz.
Replace Ass’y Main P.C.B or MICOM
E3 1. Overtheating inside cavity
(no load or little load aging)
2. Air ventilation blocked around exhaust
area
3. Ventilation motor failure and magnetron
overheating
Check if the oven was operating without load or too
little load and plug the power cord in again. If error
code ‘E3’ appears again in the window display,
check resistance of Thermistor sensor and replace
if defective.
Check of any blocking mterials exhaust area
around the Air Exhaust or ventilation opening and
follow the instuctions above.
Check if the ventilation motor is operative
magnetron overheating and replace the motor if
defective.
E41 1. Main Relay (RY1) or Power Relay1(RY2)
failure
2. Loose lead wires of relay
3. Primary or Monitor S/W failure
4. Loose lead wires of Primary or Monitor
S/W
5.
H.V.Trans input power sensing circuitry
failure
Check Main Relay (RY1), Power Relay1 (RY2)
Primary S/W and Monitor S/W and replace if
defective.
Check if lead wires are loosened and connect
firmly if loose.
Check the circuitry and replace if defective.
(Refer to Operating Sequence
as shown in page 32.)
E42 1. Main Relay (RY5) failure
2.
Loose lead wires of Power relay (RY5)
3. Primary or Monitor S/W failure
4. Loose lead wires of Primary or Monitor
S/W
5. Fuse(10A)blown out on neutral area of
Ass’y Noise Filter.
6. H.V.Trans input power sensing circuitry
failure
Check Power Relay2,Primary S/W,Monitor S/W
or Fuse and replace if defective.
Check if lead wires are loosened and repair as
necessary.
Check the circuitry.(Refer to Operating
Sequence as shown in page 32.)
E5 1. Memory IC(EEPROM IC) failure
2. MICOM failure
Check Memory (IC3) and replace if defective.
Replace Ass’y Main P.C.B or MICOM.