Question about Konica Minolta Office Equipment & Supplies

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We have a customer with a Konica 2125 copier that has a blank LCD screen on the control panel. The print switch will glow orange but will not turn green. The AES, RADF, AES lights are on but you cannot make it zoom up or down or make a copy. The LCD screen is always blank even if you open a side door. We have switched out the following items from a known working machine and still have the same problem. All printed circuit boards in back of machine. All wiring harnesses to all boards and AC wiring harnesses as well. Complete control panel including both door interlock switches. Complete drum/developer unit.Complete fuser unit.Tested exposure lamp and is OK. Checked all grounds in back of machine and all are tight.Complete feed section. Complete exit section. Power cord including noise filter board and circuit breaker. I have worked on office equipment for 18 yrs and cannot figure this one out, can anyone help us in this situation. Lee Osborne 828.327.7777

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  • Leroy Elliott
    Leroy Elliott May 11, 2010

    Why don't you ask Konica?

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  • Konica Minolta Master
  • 6,161 Answers

FROM KonicaMinolta


Description
Blank LCD.
Solution
PROBABLE CAUSES:
1. Drive pulley (A) (p/n 540076531) slips on the lens motor (M7) shaft, or the timing belt (p/n 540077520) falls off and is lodges between the motor and pulley.
As an interim repair for a slipping drive pulley (A), apply a small amount of instant adhesive between the drive pulley and motor shaft. As a permanent repair,
replace M7 with the new-style (p/n 25BA-7404). The motor must be used with the new-style adjustable drive plate assembly (p/n 5400-6321). In addition,
there is a motor cover mylar (p/n 35AE61990) that prevents M7 from interfering with the door detect wiring cover. The mylar is placed onto the underside of
the motor. These parts can not be mixed with the original parts. They must be used as a set.
Note: For more detail, refer to Parts Information Bulletin #81.
2. The 5V DC to the LCD needs adjustment. Adjust VR1 on the operation board.
Description
No power.
Solution
PROBABLE CAUSES:
1. The front door interlocks are not actuated. Open the front panel of copier and ensure that (green) handles 1 and 2 are positioned to the far right. Close the
front panel and power ON.
2. F4 (28V DC, 4A) or F5 (5V DC 2.5A) on the copier control board is open. Ensure that there are no 5V DC or 28V DC loads shorting to ground. Repair
shorting condition as necessary. Replace F4 (p/n 963012100) or F5 (p/n 936012300).
Note: If replacing the fuse, see Technical Operations Bulletin #A15, dated 7/24/95.
3. No 5V DC output from the DCPS with all loads disconnected. Check all 5-volt loads for shorting to ground. Repair as necessary. Replace the DCPS (p/n
540084513).
4. Main CB failure. Replace the main CB (p/n 35BE-9010).

Posted on Jul 29, 2009

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We have a customer with a Konica 2125 copier that has a blank LCD screen on the control panel. The print switch will glow orange but will not turn green. The AES, RADF, AES lights are on but you cannot...


No power.
Solution
PROBABLE CAUSES:
1. The front door interlocks are not actuated. Open the front panel of copier and ensure that (green) handles 1 and 2 are positioned to the far right. Close the
front panel and power ON.
2. F4 (28V DC, 4A) or F5 (5V DC 2.5A) on the copier control board is open. Ensure that there are no 5V DC or 28V DC loads shorting to ground. Repair
shorting condition as necessary. Replace F4 (p/n 963012100) or F5 (p/n 936012300).
Note: If replacing the fuse, see Technical Operations Bulletin #A15, dated 7/24/95.
3. No 5V DC output from the DCPS with all loads disconnected. Check all 5-volt loads for shorting to ground. Repair as necessary. Replace the DCPS (p/n
540084513).
4. Main CB failure. Replace the main CB (p/n 35BE-9010).

OR

Blank LCD.
Solution
PROBABLE CAUSES:
1. Drive pulley (A) (p/n 540076531) slips on the lens motor (M7) shaft, or the timing belt (p/n 540077520) falls off and is lodges between the motor and pulley.
As an interim repair for a slipping drive pulley (A), apply a small amount of instant adhesive between the drive pulley and motor shaft. As a permanent repair,
replace M7 with the new-style (p/n 25BA-7404). The motor must be used with the new-style adjustable drive plate assembly (p/n 5400-6321). In addition,
there is a motor cover mylar (p/n 35AE61990) that prevents M7 from interfering with the door detect wiring cover. The mylar is placed onto the underside of
the motor. These parts can not be mixed with the original parts. They must be used as a set.
Note: For more detail, refer to Parts Information Bulletin #81.
2. The 5V DC to the LCD needs adjustment. Adjust VR1 on the operation board.

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it it has a glow to it you panel lighting is fine but you control board is bad. If you have a dark screen and see faint images you panel back lighting is out u can check the power with a meter at the connection to inverter board on panel.

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