Fix thermal-pressure motor lock
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This tutorial[1] provides step-by-step instructions to replace a broken gear powered by the Thermal Pressure Motor. This process applies to most Riso Z-type (and beyond ) duplicators and is demonstrated here on an MZ1070. The error messages "T19-208" or similar codes such as "T19-XXX" may indicate the need for this replacement.
Overview
The gear in question is prone to wear over time. Replacement gears, such as part #612-10010, are commonly available on platforms like AliExpress or eBay. It is recommended to acquire the replacement part before beginning the procedure.
Steps
Configure
1: Remove the outer cover of the Master Removal Unit (feed side)
- Unscrew and remove the outer cover (5 screws in total). The left side may be slightly hooked.
2: Remove the top cover of the paper feed
- Unscrew and remove the plastic cover (2 screws). Pull the cover towards you and set it aside.
3: Disconnect cables and remove the Master Removal Unit
- Unplug 2 cables and the connector. Remove the cable clamp.
- Unscrew 2 screws holding the Master Removal Unit in place.
- Carefully pull the unit out; it is heavy.
4: Push the MMU towards the paper feed side
- Open the cover of the Master Making Unit (MMU) and push the MMU towards the opposite side. If it doesn’t move, proceed to the next step.
5: Press the plastic hook to advance the MMU
- Push the hook to allow the MMU to slide further into the machine.
6: Push the MMU all the way in
- Continue pushing the MMU until it stops.
7: Remove screws from the Thermal Pressure Gear Cover
- From the paper feed side, unscrew 2 screws. Hold the MMU to prevent it from sliding back.
Open and disassemble the MMU
8: Remove the MMU bottom cover
- Unscrew 2 screws and set the cover aside.
9: Remove the TPH
- Avoid touching the TPH stripe (yellow/orange color). - Remove the black plastic snap ring and spring. - Lift and remove the top bronze bearing metal. - Unplug 2 cables connected to the TPH. - Carefully lift the TPH while holding the lower bronze bearing metal.
10: Unscrew the earthing
- Hold the TPH and unscrew the earthing screw, ensuring it does not fall inside the MMU.
11: Remove the top screws of the Thermal Pressure Gear Cover
- Unscrew the top 2 screws to remove the cover.
Inspect and replace the gear
12: Check the gear
- Inspect the gear for damage. If it is intact, the issue may be elsewhere.
13: Remove springs from the fulcrum shaft
- Remove the springs with care, as they are under tension.
14: Remove e-rings from the fulcrum shaft
- Use pliers or a screwdriver to carefully remove the e-rings, as they are tight.
15: Remove the fulcrum shaft
- Extract the shaft to access the gear.
- Unscrew the white plastic piece and any remaining gear fragments. - Remove the tiny e-ring and push the shaft to the left.
17: Install the new gear
- Slide the new gear onto the shaft. - Reassemble the shaft and ensure the white plastic piece faces inward.
Put it back together
18: Reassemble =
- Grease the new gear and reassemble all components in reverse order.