In the majority of small and medium-sized cities and villages, Changfeng brand, Narcissus brand and other large-capacity double-barrel washing machines have a large market share and have gradually entered the maintenance period. The author found in the maintenance practice. This type of double-tub washing machine is most likely to be inoperable due to mechanical timer damage during use. In addition to the defects and quality of the timer itself. There are also users who use it improperly. When using this kind of washing machine, some users adjust the direction of the hand in the opposite direction when the timer is completely stopped, forcing the washing tub to stop. Over time, the internal gear of the mechanical timer is damaged. I use an electronic timer to replace the mechanical timer. It not only overcomes the problem of mechanical timer damage, but also receives unexpectedly good results.
These two kinds of timers have the same internal structure, working principle and lead line color, except for the shape. The following is an example of the Changfeng XPB50-8S washing machine four-wire mechanical timer and five-wire electronic timer. Introduce the specific substitution method.
The Changfeng xPB50-8S washing machine four-line timer uses a mechanical timer. The machine uses four-wire mechanical timers from Jiangsu Jiangyin Dongfeng Hardware Appliance Factory and Cixi Yokogawa Telecommunications Electronic Equipment Factory and Ningbo. The external shapes, structural features, lead wires, etc. of these timers are almost identical and can be used interchangeably. The internal structure of the timer and the rule of the lead line are shown in Figure 1. The internal structure and lead-out line of the five-wire electronic timer are shown in Figure 2. 
In Figure l: the black line is AC 220V power input, red and yellow two lines control the washing motor forward and reverse respectively. The blue line is connected to the buzzer.
In Figure 2: the brown line is the buzzer control line; the red and blue two lines control the motor forward and reverse; the gray and yellow two lines are connected to 220V AC, and the internal permanent magnet motor M of the timer is supplied with power. R1 and R2 are both 2W100k resistors. Use for buck.
When using the five-wire electronic timer to replace the Changfeng XPB50-8S four-wire timer, the electronic timer and mechanical timer wiring are shown in Figure 3. 
As long as the above connection is correct. Plug in the AC 220V power socket, the washing machine can run normally, and its performance is better than the original mechanical timer. Because the electronic timer manual positive and negative control can achieve the "timing" effect, there is no weakness in the user's use during the process of screwing. The author used this method to improve dozens of Changfeng XPB50-8S washing machines. No re-damage timer was found during the three years of follow-up. It is important to emphasize that when purchasing an electric timer, an electronic timer with regular manufacturers and trademarks is required. Those "three no" products are best not to be purchased.
In the future, when readers encounter a mechanical timer failure, they can use the electronic timer to replace it. It will definitely get twice the result with half the effort.
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