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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Point of Sale Terminal cannot detect receipt printers and no display
Hi,
Am doing a repair job on a Point of Sale (POS) terminal which has the problem of the motherboard's printer socket of failing to recognise the existance of the printer (the receipt printer is connected to the terminal's motherboard via a connector). Was told to change the NPN Darlington transistors (2pairs): one pair is controlling the slip printer and the other pair is for the roll printer. The transistors used are Sanken Electronics's SL4031. Some other boards use Fujitsu Microelectronics's FT5754M. For this particular board, the original transistors are Sanken's but I am using the Fujitsus. After soldering them and powering on the terminal, the printer can be switched on (it is powered on via the connector thru the motherboard printer socket). The terminal can be powered on but there's no display: just a lit-on screen. Burning smell is present from the motherboard. The terminal still could not detect the slip printer. Error message is "Printer not installed". One motherboard LED indicator is not lit and the LED for the printer sockets is flashing. Any advise is welcome. Thanks. |
#2
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for the pair of Darlington transistors for the slip printer, one of
them is feels hot. |
#3
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"Seventh Prince" wrote in
oups.com: Hi, Am doing a repair job on a Point of Sale (POS) terminal which has the problem of the motherboard's printer socket of failing to recognise the existance of the printer (the receipt printer is connected to the terminal's motherboard via a connector). Was told to change the NPN Darlington transistors (2pairs): one pair is controlling the slip printer and the other pair is for the roll printer. The transistors used are Sanken Electronics's SL4031. Some other boards use Fujitsu Microelectronics's FT5754M. For this particular board, the original transistors are Sanken's but I am using the Fujitsus. After soldering them and powering on the terminal, the printer can be switched on (it is powered on via the connector thru the motherboard printer socket). The terminal can be powered on but there's no display: just a lit-on screen. Burning smell is present from the motherboard. The terminal still could not detect the slip printer. Error message is "Printer not installed". One motherboard LED indicator is not lit and the LED for the printer sockets is flashing. Any advise is welcome. Thanks. ahhhm, new motherboard & printer? ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#4
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ahhhm, new motherboard & printer?
Nopes. Am using the existing motheboard and printer. But before initiating repairs, I have tried with new prnter and new cable connector. Same result: "no printer installed". During Some stages of the repair, I have tried with the new printer and cables, and same result also: "no printer installed". |
#5
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If hooked up w/ standard serial cable, you may need a null modem between the
computer and the printer. "七少爷Seventh Prince" wrote in message ... ahhhm, new motherboard & printer? Nopes. Am using the existing motheboard and printer. But before initiating repairs, I have tried with new prnter and new cable connector. Same result: "no printer installed". During Some stages of the repair, I have tried with the new printer and cables, and same result also: "no printer installed". |
#6
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Sue D Nim wrote: If hooked up w/ standard serial cable, you may need a null modem between the computer and the printer. "七少爷Seventh Prince" wrote in message ... ahhhm, new motherboard & printer? Nopes. Am using the existing motheboard and printer. But before initiating repairs, I have tried with new prnter and new cable connector. Same result: "no printer installed". During Some stages of the repair, I have tried with the new printer and cables, and same result also: "no printer installed". Hi... Just a coupla thoughts... Is the serial port enabled in bios? If so, is the right type chosen? The correct IRQ? And those silly D connectors, if pushed together carelessly can result in one (or more) pins being bent down. Checked for that possibility? Take care. Ken |
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