Toyota 850/851/860 Electronics

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Toyota Electronics

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Toyota Control Panel

The Toyota 850/851/860 machine electronics consist of the main power box, control panel and various other small boards such as head cards and sensors.

List of boards generally found on the Toyota 850/851/860 models:

Power Box

Shown in picture. The Toyota 850/851/860 Power Box houses the Toyota 850/851/860 main power boards.

Control Panel

Control Panel

Mother Board

Early Toyota AD850
The mother board is located in a steel enclosure in the back left corner of the machine under the wooden cover plate. It has external connectors for external power supply and 9-pin SUB-D serial connection. Internal Connectors for step-motor and sewing motor control, control box, all sensors and needle change motor. The printed board has 3 CPU and 3 ROMs in sockets. The 3 ROM are as follows:

• M-ROM
• X-ROM
• Y-ROM

Some machines have EPROMS (either ex-works or after software up-grade). These ROM or EPROM have 64KByte (type 27C512)

The 4th ROM (Operation ROM) is located in the Control Box.

• OP-ROM

Depending on software version the OP-ROM is 27C256 or 27C512.

Late Toyota AD850
The mother board is located in a steel enclosure in the back left corner of the machine, under the wooden cover plate. Late AD850 have a daughter board within the same steel enclosure.

The motherboard has external connectors for external power supply and 9-pin SUB-D serial connection. Internal Connectors for step-motor and sewing motor control, daughter board, all sensors and needle change motor. The printed board has 3 CPU and 3 ROMs in sockets. The 3 ROM are as follows:

• M-ROM (latest known ver 6.2)
• X-ROM (latest known ver 6.0)
• Y-ROM (latest known ver 6.1)

Some machines have EPROMS (either ex-works or after software up-grade). These ROM or EPROM are 512Kbit (64Kbyte) 27C512.

Toyota AD850 mother board

The daughter board has external connector to disk drive and internal connectors to mother board and control box On late AD850 the 4th ROM is located on the daughter board.

• OP-ROM (latest known ver 6.2)

Due to more implemented functions the ROM is 128KByte (27C1001). Depending on software version the OP-ROM is 27C256 or 27C512.

Toyota AD850 daughter board

Troubleshooting and Error Messages

The Toyota 850/851/860 machine can produce the following error messages

Needle Case Error

Needle Case Error

Toyota 850/851/860 Electronics Repairs

PLRElectronics specialized in repair of all the Toyota 850/851/860 electronics. Generally it is much cheaper to have the Toyota electronics repaired rather than buying very expensive new boards.

USB Upgrade

Pair of Floppy To USB drives

External USB Embroidery Reader, Embroidery Black Box

The USB Upgrade for the 850 and 860 can be found at:

Toyota 850 and 851 USB Upgrade

The Toyota 850 and 851 External Reader (Embroidery Black Box) can be purchased at: USB Flash Reader Embroidery Machine Transfer System. This is a 9 pin serial connector that attaches to the back of the machine.

Toyota 860 USB Upgrade

The Toyota 860 External Reader (Embroidery Black Box) can be purchased at: USB Flash Reader Embroidery Machine Transfer System. This is a 9 pin serial connector that attaches to the back of the machine.

The Toyota 860 (Floppy To USB) can be purchased at: Floppy To USB Upgrade

See also

• PLRElectronics - Tajima Repair - Electronic Repair and Troubleshooting for Tajima circuit boards

External links

• PLRElectronics - Tajima Repair - Electronic Repair and Troubleshooting for Tajima circuit boards