XP7

Foxzc

麻烦老师帮忙看看我的XP7问题，谢谢

kaosun

Your issue of the XP7 should be defined as "Battery cannot power on."
Analysis:
1: Battery B+ goes through D407 to power IC403. IC403 is DC-DC boost circuit, B+ from Ni-MH batteries usually 2.5V, it will be boosted to +3V.
2: +3V will power the CPU IC201 into standby mode, waiting for key pressing.
3: Pls double check D407.

Foxzc

kaosun replied at 2022-11-17 13:51
Your issue of the XP7 should be defined as "Battery cannot power on."
Analysis:
1: Battery B+ goes t ...

顾老师，请问您有爱华XP7后期版本，CXD2500+SM5871的维修手册吗？我还有一台XP7的故障对着您发的飞线版本维修手册看，很多标记的元件找不到。
我另一台XP7的故障如下：
1.插电源按下4V电池检测开关屏幕不显示C；
2.插电源按下舱门检测开关后按启动，屏幕灯不亮，屏幕显示3格电量（没放入电池，不插电源放入镍氢电池后显示1格电量，证明IC403应该是正常的）；
3.按启动后，屏幕显示数字1，激光头无聚焦动作，也不出光，主轴电机也不转动；

kaosun

Due to lack of the service manual of your version, I cannot tell the detail of your issues.
According to the version we have:
1: Check the charging control chip: IC501. The pin 5 of the IC501 has the REF 1.2V original from IC404, pin 6 directly from battery voltage. If REF greater than battery b+, IC501 pin 7 outputs H to Darlington transistor Q501 to charge your battery. Once the battery B+ as high as the REF, the IC501 outputs L to turn off charging.

2: LED array: A: power supply +B comes from IC401 pin5 which is a power adapter regulator.
    B: The control signal is form CPU IC201 pin 70, to control a dual transistor Q409. You should double check the control signal from CPU, Q409 and +B.

3: Pls double check the power supply of the driver chip LB8106 pin 25.

Foxzc

kaosun replied at 2022-11-23 11:35
Due to lack of the service manual of your version, I cannot tell the detail of your issues.
Accordin ...

收到，谢谢您

Foxzc

后期版本正反面PCB图如下

Foxzc

kaosun replied at 2022-11-23 11:35
Due to lack of the service manual of your version, I cannot tell the detail of your issues.
Accordin ...

1.根据您提供的思路，我查了下IC404的REF 1.2V送至了IC402，测量IC402的4脚会根据电池电压变化，怀疑是这个IC替换了老版本的IC501，当镍氢电池口输入3V时，IC402的4脚显示1V电压，下一步没有思路了。
3.检查了LB8106的25脚电压有4.2V，但是按启动后31脚VUOT无电压变化。

Foxzc

电路标记如下：

kaosun

Due to lack of service manual, I cannot analyze the circuit for you with no actual motherboard of your XP7. My suggestion is, replacing all SMT capacitors with PCB cleaning to remove leaking electrolyte, check each vias especially the vias close to leaking area. A ultrasonic cleaning is recommended. Next, referring to the old service manual to figure out broken/non-working components.

Foxzc

kaosun replied at 2022-11-25 15:39
Due to lack of service manual, I cannot analyze the circuit for you with no actual motherboard of yo ...

再次来请教下顾老师，我发现我这个问题XP7很多ic输入电压都较低，正面最大的这个ic（像三极管的丝印D2201），不知道是什么零件，正常的1脚6.3V，2脚8.7V，3脚5.7V，我这个有问题的，1脚5V，2脚8.7V，3脚4.4V，1\3脚电压偏低，向线路前面找了半天，也没找到原因。