Electronics > Repair
What more i can do?
<< < (11/112) > >>
u666sa:
Could be bad solder. You need good microscope with lots of light and good eye. Go over every joint.

Also, connect power supply and see what current is doing. Since you have working controller, you can compare with what it should be doing. Perhaps board is partially shorted, in which case you need to examine it with thermal camera, perhaps inject voltage somewhere.  :popcorn:


VISUAL INSPECTION -> WHAT POWER SUPPLY SAYS -> THERMAL IMAGING


*P.S. Japanese microscopes are good, with nice coated optics, a lot more light enters your eye, can see more things.
222Lab_Test222:

--- Quote from: u666sa on November 01, 2024, 09:34:57 pm ---Could be bad solder. You need good microscope with lots of light and good eye. Go over every joint.

Also, connect power supply and see what current is doing. Since you have working controller, you can compare with what it should be doing. Perhaps board is partially shorted, in which case you need to examine it with thermal camera, perhaps inject voltage somewhere.  :popcorn:


VISUAL INSPECTION -> WHAT POWER SUPPLY SAYS -> THERMAL IMAGING


*P.S. Japanese microscopes are good, with nice coated optics, a lot more light enters your eye, can see more things.

--- End quote ---
Let me see, And where to inject voltage i mean, when i cross check working and non working board in terms of voltage, i found lots of volatges diffenrce in more than 10 ICs, Where is main trouble hard to conclude.
222Lab_Test222:

--- Quote from: Harry_22 on November 01, 2024, 12:45:09 pm ---Please put both boards side by side, clear your phone lens, put it on any suitable box, hold your breath and make a good photo.
May be you will get the best quality if take one by one photo.
It would be good to see chip names near the side connectors.

Also I would to discern dip switches near IC15 as well as chips in red circles.

I have usual Chinese phone. You can see the test photo below.

Your fist photo was very good.

--- End quote ---

From right, the two chips IC26/IC41    D72020GC-8
The center 8 chips, IC45,46,47,48,49,50,51,52 GM53C261 X8 Individual name is M51C262-10
Near CGROM 3 IC38  23C4001EJGZ
IC near GUNZE IC69   MB89363
The one near the MSDOS is JP4/JP6

MB89363/MB89363B, Fujitsu, 5V, Two data I/O LSIs with six ports of 8-bit parallel I/O
http://archive.computerhistory.org/resources/access/text/2013/04/102723432-05-01-acc.pdf (page 180)

MB89254, Fujitsu, Programmable Timer with three independent timer channels, DIP-24:
https://pdf.dzsc.com/autoupload/04ae79cd-5671-4a97-93a6-87bb2b912ffc.pdf

http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 818)

uPD23C4001E, NEC, 512K x 8 mask ROM, SOP-40 (equivalent to KM23C40018)

https://1www.bitsavers.org/components/samsung/_Databooks/1995_Samsung_MOS_Memory_DRAM_1110-4091.pdf (page 56)
These are all equivalent. They appear to be the ROM version of 27C4001 EPROM:

KM23C40008 (Samsung), uPD23C4001E (NEC), HN62335 (Hitachi), HN623448 (Hitachi), TC534000A (Toshiba), LH5341008 (Sharp), M5M23C401AP (Mitsubishi), MB834000A (Fujitsu), CXK384001 (Sony).

uPD72020GC, NEC, CMOS GRAPHIC DISPLAY CONTROLLER, QFP-52:
https://www.datasheetarchive.com/pdf/download/library/Datasheets-ZSAA1/DSAZSAA0006055.pdf?h=dbd324f5048e3bc420cdee7e3d2578a4%3A2caf4572a5cf3e36fee8%3A16029b4090d834c4a20d625f63f821dd

LC3564B, BS, BM, BT-70/10, Sanyo, 64K (8192-word x 8-bit) SRAM, DIP-28:
https://pdf.datasheetcatalog.com/datasheet/sanyo/ds_pdf_e/LC3564BM-70.pdf

M27C2001, STMicroelectronics, 2 Mbit (256Kb x 8) UV EPROM and OTP EPROM, DIP-32:
https://www.farnell.com/datasheets/72409.pdf

GD75232, LGS, 3 RS232 drivers and 5 receivers, 5V, +/-15V, 20-pin:
https://www.ti.com/lit/ds/symlink/gd75232.pdf

MB89255A, Fujitsu, Parallel Data I/O Interface, functionally compatible with the Intel 8255A:
http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 819)

82C55A, Intel, CHMOS PROGRAMMABLE PERIPHERAL INTERFACE, 5V, PLCC-44:
https://www.alldatasheet.com/datasheet-pdf/download/66112/INTEL/82C55A.html

GM53C261, Goldstar, 64K x 4 Bit Multiport Video RAM, 5V, 24-pin ZIP:
http://bitsavers.informatik.uni-stuttgart.de/components/goldStar/_dataBooks/1993_GoldStar_MOS_Memory.pdf

MB89251A, Fujitsu, Serial Data Transmitter/Receiver, 28-pin:
http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 817)

MB8464C, Fujitsu, 16K (2K x 8) CMOS Static RAM, 5V, DIP-28:
http://www.bitsavers.org/components/fujitsu/_dataBooks/1984_Fujitsu_Memory_Data_Book.pdf (page 204)

PALCE16V8H, AMD, Universal Programmable Array Logic, 5V, 20-pin:
https://www.silicon-ark.co.uk/datasheets/PALCE16V8H-datasheet-amd.pdf

PALCE20V8Q, AMD, Universal Programmable Array Logic, 5V, 24-pin:
https://www.tomek.cedro.info/files/electronics/doc/ic_various/GAL20V8.PDF

M51C262, OKI, multiport 64K x 4 (256K bits) DRAM, 5V, ZIP-24:
https://bitsavers.org/components/oki/_dataBooks/1990_OKI_Memory_Data_Book.pdf (page 738)

CXK5863BP, Sony, 64Kbit (8K x 8) SRAM, 5V, 28-pin:
https://www.datasheetarchive.com/datasheet/3271000e66c77fe3?type=O&term=CXK5863BP


Connectors
CN1 /CN2/ CN3: These are used for a controller and RS232 serial ports, facilitating communication with peripheral devices and ensuring robust data transfer capabilities. It is used for RS232 serial communication, ensuring reliable data transfer between the motherboard and connected devices.RS232/ RS232/485 /RAS
CN4: It is used for printer
CN5:
CN6:
CN7: It is used for card slots, connected via a small PCB, allowing the integration of various expansion cards.
CN8:
CN9:
CN10: It is the main power for motherboard.
CN11: It is connected to another board which is a PCB, that's the main board for card slots, there is error in card slots if this have problem.
CN12: This connector is designated for a 12V fan, crucial for maintaining optimal thermal conditions within the system.
CN13: Not used in most boards as far as known.
CN14: This connector is linked to a display monitor that includes a PCB, ensuring effective video output and control.
CN15: No connector
CN16: It is used as video outputs connected directly from the other components, the big machine. Analog RGB
CN17: It is used for mouse
CN18: It is a keyboard connector.

NF could be noise filters, ie ferrite beads.
DA could be ESD protection diode arrays.
RA is probably a resistor array.
TA is NPN transistor arrays.


All ICs
IC 1 (MB3771)
IC23(D4990A)
IC54(TLC27L7)
IC53(74HCT374)
IC22(74LS174)
IC6(74F74)
IC7(74ACT08)
IC15 AND IC16(MSDOS BIOS)
IC21 / IC24 (74LS07)
IC72 / IC73 / IC63 (74HC04A/74HC14A)
IC69(MB89363)
IC70(GUNZE AHL-51A)
IC74(MB89254H)
IC75(MB89251A)
IC28/ IC77 (74LS125A)
IC38(23C4001EJGZ)
IC66(PALCE20V8Q)
IC14(LC3564BS-70)
IC83 / IC61 / IC60 / IC62 / IC82/ IC84/ IC25 (74LS244)
IC87/ IC88/ IC68/ IC89/ IC86/ IC67/ IC30/ IC31(74LS245)
IC2(P79AJ 74F04)
IC56/ IC57/ IC58/ IC59/ IC80/ IC33/ IC32/ IC34/ (PALCE16V8H-15SC/4)
IC85 (74LS373)
IC3 (74HC132)
IC18 (74LS14)
IC64 (74HC244)
IC26/ IC41 (D72020GC-8)
IC27 (MB89255A)
IC19/ IC20/ IC79 (GD75232D)
IC76 (74LS38)
IC78 (74LS153)
IC81 (SN751177N)
IC45,46,47,48,49,50,51,52 (GM53C261 X8).It consists of 8 IC, which is M51C262-10 IC.
IC36/ IC37/ IC39 (CXK5863BP-35)

NOTE: Its a Old Board, lots of IC Markings are gone, I barely can see.










222Lab_Test222:

--- Quote from: 222Lab_Test222 on November 03, 2024, 11:40:24 pm ---
--- Quote from: Harry_22 on November 01, 2024, 12:45:09 pm ---Please put both boards side by side, clear your phone lens, put it on any suitable box, hold your breath and make a good photo.
May be you will get the best quality if take one by one photo.
It would be good to see chip names near the side connectors.

Also I would to discern dip switches near IC15 as well as chips in red circles.

I have usual Chinese phone. You can see the test photo below.

Your fist photo was very good.

--- End quote ---

From right, the two chips IC26/IC41    D72020GC-8
The center 8 chips, IC45,46,47,48,49,50,51,52 GM53C261 X8 Individual name is M51C262-10
Near CGROM 3 IC38  23C4001EJGZ
IC near GUNZE IC69   MB89363
The one near the MSDOS is JP4/JP6

MB89363/MB89363B, Fujitsu, 5V, Two data I/O LSIs with six ports of 8-bit parallel I/O
http://archive.computerhistory.org/resources/access/text/2013/04/102723432-05-01-acc.pdf (page 180)

MB89254, Fujitsu, Programmable Timer with three independent timer channels, DIP-24:
https://pdf.dzsc.com/autoupload/04ae79cd-5671-4a97-93a6-87bb2b912ffc.pdf

http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 818)

uPD23C4001E, NEC, 512K x 8 mask ROM, SOP-40 (equivalent to KM23C40018)

https://1www.bitsavers.org/components/samsung/_Databooks/1995_Samsung_MOS_Memory_DRAM_1110-4091.pdf (page 56)
These are all equivalent. They appear to be the ROM version of 27C4001 EPROM:

KM23C40008 (Samsung), uPD23C4001E (NEC), HN62335 (Hitachi), HN623448 (Hitachi), TC534000A (Toshiba), LH5341008 (Sharp), M5M23C401AP (Mitsubishi), MB834000A (Fujitsu), CXK384001 (Sony).

uPD72020GC, NEC, CMOS GRAPHIC DISPLAY CONTROLLER, QFP-52:
https://www.datasheetarchive.com/pdf/download/library/Datasheets-ZSAA1/DSAZSAA0006055.pdf?h=dbd324f5048e3bc420cdee7e3d2578a4%3A2caf4572a5cf3e36fee8%3A16029b4090d834c4a20d625f63f821dd

LC3564B, BS, BM, BT-70/10, Sanyo, 64K (8192-word x 8-bit) SRAM, DIP-28:
https://pdf.datasheetcatalog.com/datasheet/sanyo/ds_pdf_e/LC3564BM-70.pdf

M27C2001, STMicroelectronics, 2 Mbit (256Kb x 8) UV EPROM and OTP EPROM, DIP-32:
https://www.farnell.com/datasheets/72409.pdf

GD75232, LGS, 3 RS232 drivers and 5 receivers, 5V, +/-15V, 20-pin:
https://www.ti.com/lit/ds/symlink/gd75232.pdf

MB89255A, Fujitsu, Parallel Data I/O Interface, functionally compatible with the Intel 8255A:
http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 819)

82C55A, Intel, CHMOS PROGRAMMABLE PERIPHERAL INTERFACE, 5V, PLCC-44:
https://www.alldatasheet.com/datasheet-pdf/download/66112/INTEL/82C55A.html

GM53C261, Goldstar, 64K x 4 Bit Multiport Video RAM, 5V, 24-pin ZIP:
http://bitsavers.informatik.uni-stuttgart.de/components/goldStar/_dataBooks/1993_GoldStar_MOS_Memory.pdf

MB89251A, Fujitsu, Serial Data Transmitter/Receiver, 28-pin:
http://bitsavers.informatik.uni-stuttgart.de/components/fujitsu/_dataBooks/1987_Fujitsu_8_16_Bit_Microprocessors_Microcomputers_Peripherals.pdf (page 817)

MB8464C, Fujitsu, 16K (2K x 8) CMOS Static RAM, 5V, DIP-28:
http://www.bitsavers.org/components/fujitsu/_dataBooks/1984_Fujitsu_Memory_Data_Book.pdf (page 204)

PALCE16V8H, AMD, Universal Programmable Array Logic, 5V, 20-pin:
https://www.silicon-ark.co.uk/datasheets/PALCE16V8H-datasheet-amd.pdf

PALCE20V8Q, AMD, Universal Programmable Array Logic, 5V, 24-pin:
https://www.tomek.cedro.info/files/electronics/doc/ic_various/GAL20V8.PDF

M51C262, OKI, multiport 64K x 4 (256K bits) DRAM, 5V, ZIP-24:
https://bitsavers.org/components/oki/_dataBooks/1990_OKI_Memory_Data_Book.pdf (page 738)

CXK5863BP, Sony, 64Kbit (8K x 8) SRAM, 5V, 28-pin:
https://www.datasheetarchive.com/datasheet/3271000e66c77fe3?type=O&term=CXK5863BP


Connectors
CN1 /CN2/ CN3: These are used for a controller and RS232 serial ports, facilitating communication with peripheral devices and ensuring robust data transfer capabilities. It is used for RS232 serial communication, ensuring reliable data transfer between the motherboard and connected devices.RS232/ RS232/485 /RAS
CN4: It is used for printer
CN5:
CN6:
CN7: It is used for card slots, connected via a small PCB, allowing the integration of various expansion cards.
CN8:
CN9:
CN10: It is the main power for motherboard.
CN11: It is connected to another board which is a PCB, that's the main board for card slots, there is error in card slots if this have problem.
CN12: This connector is designated for a 12V fan, crucial for maintaining optimal thermal conditions within the system.
CN13: Not used in most boards as far as known.
CN14: This connector is linked to a display monitor that includes a PCB, ensuring effective video output and control.
CN15: No connector
CN16: It is used as video outputs connected directly from the other components, the big machine. Analog RGB
CN17: It is used for mouse
CN18: It is a keyboard connector.

NF could be noise filters, ie ferrite beads.
DA could be ESD protection diode arrays.
RA is probably a resistor array.
TA is NPN transistor arrays.


All ICs
IC 1 (MB3771)
IC23(D4990A)
IC54(TLC27L7)
IC53(74HCT374)
IC22(74LS174)
IC6(74F74)
IC7(74ACT08)
IC15 AND IC16(MSDOS BIOS)
IC21 / IC24 (74LS07)
IC72 / IC73 / IC63 (74HC04A/74HC14A)
IC69(MB89363)
IC70(GUNZE AHL-51A)
IC74(MB89254H)
IC75(MB89251A)
IC28/ IC77 (74LS125A)
IC38(23C4001EJGZ)
IC66(PALCE20V8Q)
IC14(LC3564BS-70)
IC83 / IC61 / IC60 / IC62 / IC82/ IC84/ IC25 (74LS244)
IC87/ IC88/ IC68/ IC89/ IC86/ IC67/ IC30/ IC31(74LS245)
IC2(P79AJ 74F04)
IC56/ IC57/ IC58/ IC59/ IC80/ IC33/ IC32/ IC34/ (PALCE16V8H-15SC/4)
IC85 (74LS373)
IC3 (74HC132)
IC18 (74LS14)
IC64 (74HC244)
IC26/ IC41 (D72020GC-8)
IC27 (MB89255A)
IC19/ IC20/ IC79 (GD75232D)
IC76 (74LS38)
IC78 (74LS153)
IC81 (SN751177N)
IC45,46,47,48,49,50,51,52 (GM53C261 X8).It consists of 8 IC, which is M51C262-10 IC.
IC36/ IC37/ IC39 (CXK5863BP-35)

NOTE: Its a Old Board, lots of IC Markings are gone, I barely can see.

--- End quote ---
Poroit:
I like your tenacity :)

What is the model number of your Komatsu Tunneling machine?

I have a contact at Komatsu who may be able to assist with a circuit drawing?

Have you contacted Komatsu in Japan?

Do you have enough boards and peripherals to make up two full systems for powered up side by side comparative testing?
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