I am looking for electrical diagram for AC Drive Board for FW-870 (A1745502) and voltage on different points. The machine has no power. One stupid question: The person gave me the machine with all the manuals and specs. One of the specs paper is out of the manual and it says that the voltage input is 220v, whereas on the back label on the machine says the machine uses 115 volts. How I can find out the machine requires 220 volts. The main fuse F201 is 250V and 15A. F202 is 250v. The machine is made in Japan, serial No. A721 2020024.
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Re: Ricoh FW-870
The label on the machine would be correct and the plug itself should indicate what voltage is required. A 120V plug won't fit into a 220V receptacle and visa versa. I did find the op manuals on line, the spanish one shows 220V and the english is 120V. I would say the Latin America version is 220V.
Since this is such an old model, I don't have a problem posting the P2P here.
As a final confirmation, the part number you gave for the AC board is the 120V version. The 220V one would end in 5504.Last edited by teebee1234; 06-11-2014, 02:34 AM. -
Re: Ricoh FW-870
As teebee indicated, this is a ancient machine. The point to point will show you what the connections to the boards but will not give component level schematics. Ricoh tends to discourage board level repairs.Comment
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Re: Ricoh FW-870
As everyone has told you this is an older analog machine but it is still a good product and Ricoh does still have most of the parts for it (I do still service some of them occasionally). Not sure how reliable the 220 version is but the US version is Ok. The US version is also known as K&E 8036. Just for a little tip if you have no voltage at all this machine is famous for safety switch problems most prominent the one on the right side as you open the clam shell there is a plastic actuator that will get knocked out of place. Main board does not cause a complete power loss on this model.
I do have a schematic that shows output voltages from the main board. Let me know if you need it. Schematic is for the 8036 but the exact same machine.
Good LuckComment
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Re: Ricoh FW-870
Thanks for your very useful input. I will appreciate if you would kindly send me the schematic. Are you talking about the RED main switch? As this is an ancient machine I don't want to spend money on it. thanksComment
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Re: Ricoh FW-870
For some reason my system will not allow me to send the attachment. i am in the process of changing to a new server so just another problem to work out. Send me an email address to send the diagram to and I'll get it right out to you.
Right above the red power switch you will see a black plastic arm that pushes down on a safety switch. This arm links all of the front covers through one switch. to check it just turn the machine on and then push down on the black arm. One other safety switch on the same side as the power switch on the top rear cover which hinges down. Switch is on the bottom side of the cover. Only other thing to cause a complete power loss is a blown fuse on the AC board. This machine has a habit of melting the fuse clip on the board and can be repaired. Board itself hardly ever goes bad.
Good luckComment
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Re: Ricoh FW-870
Check the smooth capacitor of PSU, most 220V PSU's smooth cap come with 400VComment
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Re: Ricoh FW-870
I checked both black safety switches and they seem fine. I also checked the main switch and it shows fine. It has six points; four outwards for power cables and two small ones in the middle. These two points show continuity among each other even when the switch is off, but they do not show any continuity with the outer points. ls that normal or seems something wrong with the switch? I did check the fuses and they seem fine. Now the only thing is left to check the voltage on different points. main switch diagram.pdfComment
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Re: Ricoh FW-870
Keep in mind the info I am telling you is for the 110 version. Not sure how much of a difference there will be as I do not have that diagram. The two small wires in the center of the main switch are for the energy star system and should not cause your problem, continuity is normal. Check the safety switch circuit with the switch installed in the machine. The internal actuators in the switch will get worn and when you close them manually they will get more pressure on them and work but not work in the machine. Check the loop with the diagram.
Make sure you have an input voltage to the ac drive. Check input/output at the main switch. your problem is in this area as it is the only way to kill power to the entire machine.
You can check the power to the main switch by simply unplugging it put your meter on the appropriate leads and plug it in to check power at the switch. You can also check it at the pins on the board
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Re: Ricoh FW-870
I have removed the transistor M25JZ51 from the AC drive board and checked. It seems that the transistor is bad. Now I will order one and check if that was the only problem. I am taking all the responses very seriously and read them few times to understand the instructions. I appreciate and thank all the persons responding my requests. Does anyone know the substitute of this transistor?Comment
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Re: Ricoh FW-870
M25JZ51 is not a transistor and it is a thyristorComment
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Re: Ricoh FW-870
What is the best way to check it?Comment
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Re: Ricoh FW-870
I tested the thyristor according to the attached instruction sheet at 200 Ohm at my digital multimeter. The reading between anode and cathode are 79.5 each way but there is no reading at all between gate and anode or cathode. I am using Fluke 8024 B multimeter. how to check thrystor.pdfComment
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