Chip Level Repair Motherboard Rework Station

1.DH-A2 Automatic Chip Level Repair Motherboard Rework Station.
2.Directly ship from original and the largest manufacturer of BGA rework station in Shenzhen, China.
3.Popular model

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Description

Chip Level Repair Motherboard Rework Station

Model: DH-A2

1.Application Of Automatic

Solder, reball, desoldering different kind of chips: BGA,PGA,POP,BQFP,QFN,SOT223,PLCC,TQFP,TDFN,TSOP, PBGA,

CPGA,LED chip.

2.Advantage of Automatic

3.Technical data of laser positioning Automatic Chip Level Repair

Motherboard Rework Station

Power	5300w
Top heater	Hot air 1200w
Bottom heater	Hot air 1200W. Infrared 2700w
Power supply	AC220V±10% 50/60Hz
Dimension	L530W670H790 mm
Positioning	V-groove PCB support, and with external universal fixture
Temperature control	Ktype thermocouple,closed loop control,independent heating
Temperature accuracy	±2℃
PCB size	Max 450490 mm, Min 22 22 mm
Workbench fine-tuning	±15mm forward/backward,±15mm right/left
BGA chip	8080-11mm
Minimum chip spacing	0.15mm
Temp Sensor	1(optional)
Net weight	70kg

4.Structures of Infrared CCD Camera Automatic

5.Why Hot air reflow Chip Level Repair Motherboard Rework Station is your best choise?

6.Certificate of Optical Alignment Automatic

UL, E-MARK, CCC, FCC, CE ROHS certificates. Meanwhile, to improve and perfect the quality system,

Dinghua has passed ISO,

GMP, FCCA, C-TPAT on-site audit certification.

pace bga rework station

7.Packing & Shipment of CCD Camera Automatic

8.Shipment for Split Vision Automatic

DHL/TNT/FEDEX. If you want other shipping term, please tell us. We will support you.

9. Operation guide for Optic Align Automatic

11. Related Knowledge of Automatic Infrared Chip Level Repair Motherboard Rework Station

When the DDR termination resistor is placed incorrectly

Currently, the position of the termination resistor in the DDR module (one drive) corresponds to the length of the differential pair.

High-speed signals cannot have right angles, and 25G signals should not have long stubs. This is basic SI (Signal Integrity) knowledge.

So, if you encounter a DDR module with the termination resistor placed incorrectly, what should you think?

The position of the DDR module termination resistors, as mentioned above, is fundamental SI knowledge.

The DDR termination resistor should be placed at the end. You may think that such an error should not occur, but unfortunately, Mr. High Speed has seen many such cases. In fact, there was even one case where this rule was violated-not during the design stage, but on a board that had already been produced...

This was a 1-to-4 DDR3 module. The customer's goal was to run it at 800M, but they found that it could only run at 400M. Mr. High Speed initially thought it would be difficult to locate and optimize the design, but upon reviewing the customer's board, it was found that the termination resistors had been placed incorrectly. They were positioned at the first particle location, as shown in the clock signal topology below. The termination resistor is marked by the red frame.

The first step we needed to take was to verify the test results through simulation. We simulated the 800M clock and address signals separately, and the results indeed matched the test.

The clock signal completely failed at granule 2, and the address signal was also significantly weak. Additionally, the customer mentioned that the board could run at 400M, so we also simulated the situation at 400M.

At 400M, from the simulation perspective, both the clock and address signals had some margin, and it was possible for the test to pass.

The problem and solution for this board were clear. After redesigning the board, we placed the termination resistor in the correct position. The board passed the 800M test without any issues. This case serves as a "lesson" reminding us that some rules cannot be violated casually, especially those that are widely recognized in the industry. Otherwise, you will face failure in your design process.

This issue in the article is simple, but I hope it provides some inspiration to everyone.