New Life Games LLC
NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. => Channelmaniac's Arcadecomponents' Old School Repair Logs => Topic started by: channelmaniac on May 04, 2014, 10:38:59 AM
-
Model: Data I/O Model 22 EPROM Programmer
Symptom: Fails self test: ROM ERROR
This was a strange one. Pulled the EPROMs from the unit and read them in on another programmer. Sent the checksums off to the 'official' repair person for the unit. They were good. Burned a new set of ROMs and found 1 that would read but would not work properly at normal operating speed. Replaced that EPROM to fix the programmer.
-
Model: Data I/O Model 22 EPROM Programmer
Symptom: Will not read or program ICs correctly
When troubleshooting this programmer it's important to note what modules are in it. In this case the 351A-064 PROM module was installed. Removed the module and the programmer worked as it should.
Disassembled the module and found that pins 13 and 14 on the left socket were shorted together. The solder on the socket wasn't factory. Pulled the socket and removed a solder bridge from the top of the board. Reassembled and tested the programmer successfully with the module installed.
-
Model: Data I/O Model 22 EPROM Programmer
Issue: Software needed to run optional module
This model of programmer has its software in EPROMs installed on the bottom board. If an optional module is installed the software on ROM must be updated. According to the authorized support person this software is custom for each module. I ended up purchasing a Model 22 and wanted the optional PROM programming adapter, 351A-064, and could not simply acquire one apart from the programmer because of this.
Make sure to get the programmer WITH the adapter installed! Do not buy them separate unless you can verify the correct software is installed. To my knowledge this is not possible to verify from the chip labels or from the front panel.
-
Model: Data I/O Model 22 EPROM Programmer
Issue: How do you get larger amounts of data on it to program an IC?
This is an OLD programmer and it has an archaic RS-232 interface. This interface is well suited to hook into development tools but not really for a PC. If you have a small PROM chip to program it's a simple task to manually key the data in but... that's not the case for a 2708 (1k x 8 EPROM). There you will need to enter up to 1024 values to program into the chip.
To get around this simply program the code on the smallest EPROM your newer programmer can handle. This will most likely be a 2716 EPROM. Insert that chip into the old programmer, read it into RAM, then program it on the needed chip.
-
This tidbit came from Ken Layton:
If you have a Simpson 260 volt-ohmmeter regardless of vintage, here is all about them:
http://www.simpson260.com/ (http://www.simpson260.com/)
-
Model: Andromeda Labs AR-32A EPROM Programmer
Symptom: Will not program ICs
An AR-32A programmer stopped programming ICs. Tested the bank of 8 DIP switches and found that switches 4 through 8 were stuck open. Replaced the DIP switches and tested. The device to be programmed had 8.3 volts on the programming voltage pin that dropped down to 4.3 volts when reading or programming. Replaced a shorted 2N3906 transistor and tested by programming some EPROMs.
-
Model: Fluke 9010A Micro System Troubleshooter
Symptom: Upgrade Firmware
Unit was running revision 2C firmware. Replaced U9, U19, and U21 with 27C128 EPROMs programmed with version 3A firmware. Tested unit.
-
Model: Fluke 9000-Z80 (Fluke Z80 Pod)
Symptom: Fails self test: Code 00
Ribbon cable was physically damaged. Built a replacement ribbon cable and tested.
NOTE: There are 2 ways to rebuild this cable. The first is to use the same type of braided ribbon cables. This pod had 2 of those 40 pin braided ribbon cables - one for odd and one for even pins. The odd pins on one of the ribbon cables were connected to ground. The second way is to use shielded ribbon cable and ground the shield.
After building one with 2 40-pin ribbon cables I would highly recommend using a single shielded ribbon cable.
-
Model: Philips LCDT 19PFL5422D/27B
Symptoms: Loses audio and picture. Shuts off by itself
TV would work for a couple of minutes then lose audio. About 10 minutes later it would lose video. It progressively got worse until it would only power up for a few seconds then go off/on several times by itself before shutting off.
Replaced three bad capacitors on the logic board and tested.
-
Model: TOP853 Universal Programmer
Symptom: Would not program EPROMs
Programmer would create the proper voltage levels but they would drop off quickly during programming. Replaced bad MC34063 voltage converter IC and tested.
This unit uses surface mount 4049 ICs floating above ground and powered by the Vpp voltage levels. These must be checked for failure when replacing the MC34063.
-
Model: BK Precision 1479B Oscilloscope
Symptoms: Input mode switches not working properly on Channel A or Channel B
Scope worked, but the input mode switches (AC - Gnd - DC) had to be jiggled to get them to work in the desired mode.
Cleaned the input mode switches and the Volts/CM adjustment pots. Resoldered all the Molex style board interconnects to fix cracked solder joints. Repaired another 11 cracked solder joints. Tested.
-
Model: DT-1 Dynamic RAM Tester
Symptom: Dead
Replaced broken on/off switch, backed up program ROM, and tested.
-
Model: HP 10529A Logic Comparator
Symptom: Chips in universal socket adapter get hot
When using the 10529-60017 (Series 2204) universal socket, 74LS157 chips get roasting hot. LED 11 flickers on known good chips. Replaced 2 shorted Germanium diodes and tested.
1N270 diodes were successfully used as replacements for the HP diodes, part number 1910-0047.
-
Model: Xeltek Superpro/L+
Symptom: Dead
Power supply had no output. Opened the supply, replaced a 1uf/50v and a 47uf/25v in the high voltage section, and resoldered several cracked solder joints. Tested.
This power supply was sealed. To open such a power supply, simply use a small ball peen or brass hammer to crack the glued joints apart. Repair the power supply and reseal it with epoxy or super glue.
-
Model: Pace SX-70 Desoldering Iron
Symptom: No suction
Iron was purchased as parts.
Replaced bad front seal, cleaned heater bore, and installed a new tip. Replaced broken glass chamber, reinstalled S baffle, and installed a new filter. Tested.
-
Model: Anatek Corp Blue ESR Meter
Symptom: Will not read caps
Looked at a kit a friend built. Unit would read the test resistors but all caps read as .00 ohms. Found a 2N2904 and 2N2906 transistor that were swapped during the kit build. Swapped the transistors and tested caps successfully.
-
Model: HP 1703A Oscilloscope
Symptom: No trace
Cleaned pins on 2 74L00 ICs, Fixed a bent pin on an IC that was folded under the IC. Tested.
-
Model: Data I/O Series 22
Symptom: Dead. Nothing on display.
The voltage to the main board was 4.6v. Removed reseated the cable from the power board a few times, it read 4.98v on the main board, and was booting to a SYSTEM ROM ERR message. Replaced the old EPROMs with ones burned with newer code and it booted and passed self tests.
It has the following options in ROM: 30, 31, 32, 40, 43, 46, 48, 49, 50, 53, 55, 57, 60, 63, 66, 69, 72, and 74.
-
Model: Tektronix PS2521G Programmable Power Supply
Symptom: Missing output
Fixed mulitple cracked solder joints and tested.
Note: This unit will not operate properly until you set an output over-voltage protection limit, voltage level, and current level for the output. Over-current Protection can be turned on or off as needed.
-
Model: APC RackUPS 1500
Symptom: Will not hold charge
Picked up a cheap UPS for $30 as-is for keeping the shop computers running. Opened it up and removed the 4 swollen, cracked lead-acid batteries, replaced one corroded spade lug connector, and installed new batteries. Tested.
Unit used 4 7A 12v standard sized lead acid batteries.
When replacing the swelled batteries in a rack mount UPS it's necessary to remove the top of the unit as well as the battery compartment door. You may need to bend the top bar above the battery door to allow for clearance to remove the old batteries. Put this back into place afterwards.
-
Model: Fluke 87
Symptom: Constant beeping
This model senses if the probes are plugged into the wrong jack on the front of the meter. Removed debris from inside Amp input jack and tested.
-
Model: Stag ZL80A Logic Programmer
Symptom: SELFTEST FAIL 1
Error was caused by bit rot on firmware EPROMs. Replaced 30A39 firmware EPROMs with chips loaded with 30A48 firmware and tested.
-
Model: LM-3 Logic Monitor
Symptom: Broken input connector
Replaced broken input connector and straightened a bent trimmer pot that was shorting out on an adjacent solder joint. Tested.
-
Model: Spectroline PC-1100 EPROM Eraser
Symptom: Flickering light and hissing sound.
Replaced bulb. Found a screw attached to the drawer close magnet. Reinstalled screw in the proper place and replaced two bent screws that hold the bulb drawer in place. Reassembled and tested.
Note: This bulb is mounted by 8 screws and the 2 leads are connected to the transformer by a high voltage screw terminal assembly. The leads for the bulb are too long and must be bent and soldered into an oval shape to minimize any sharp edges and possibility of corona discharge from the high voltage.
-
Model: Fluke 9000A-6809 pod
Symptom: Dead. "POD TIMEOUT - ATTEMPTING RESET"
Replaced a bad 74LS541 at U2 and 74SC374 at U7 on the interface board. Tested.
Note: 74SC series is the military equivalent of 74HCT374. It is OK to replace the 74SC374 with a 74HCT374 on the Fluke pods.
-
Model: Fluke 9000A-6809 pod
Symptom: Dead. "POD TIMEOUT - ATTEMPTING RESET"
Board had attempted repair problems.
Replaced a bad LM311 at U16 on the interface board to fix the power fail detection circuit. Tested. Still stuck in reset.
Replaced bad aftermarket ZIF socket with the correct one from a donor board. Replaced bad 6532 RIOT chip at U1. Replaced defective CPU socket at A23-J3 and tested successfully.
-
Model: Fluke 9000A-68000 pod
Symptom: Dead. "POD TIMEOUT - ATTEMPTING RESET"
Pod had attempted repair problems.
Replaced a missing 74HCT374 IC, one missing hybrid protection module, and 2 cracked hybrid protection modules. Tested.
-
Model: Fluke 9000A-8080 pod
Symptom: Intermittent self test failures.
Crimped a new replacement ribbon cable assembly and installed it.
Note: If crimping a replacement cable, pin 1 is on the right and there are four wires that need to be swapped around when they are inserted into the 40 pin IDP connector:
Cable - IDP
37 - 39
38 - 38
39 - 40
40 - 37
-
Model: Fluke 9000A-Z80 pod
Symptom: Dead. "POD TIMEOUT - ATTEMPTING RESET"
Logic probe showed the CPU address and data lines were dead and the reset line was toggling high/low constantly. Checked clock next and found it missing. Removed the ribbon cable from the ZIF socket and checked pin 6 for the clock signal and it was missing. Replaced a dead 4049 IC in the clock generator circuit and tested successfully.
The clock signal does not connect directly to the CPU on these pods. It goes through the ZIF socket and ribbon cable to the interface board then through the board interconnects to the CPU. This is because the CPU runs at the clock speed of the unit under test and the on board clock is only needed for self-tests.
-
Model: HP 6255A dual power supply
Symptom: Left channel dead
The left channel would output slightly negative voltage and would not adjust. The HP troubleshooting manual's steps made it look like there was a problem with Q5 and its associated circuitry but all of that tested good. Replaced a bad 500 ohm 10 watt resistor at R36 off the base of Q7, in the Series Regulator circuit.
Ran a radio in the shop for a couple of hours to test.
-
Model: Fluke 9000A-80188 Interface Pod
Symptom: Dead. "POD TIMEOUT - ATTEMPTING RESET"
The CPU was receiving a clock signal but the CLKOUT pin on the CPU was stuck low. Resistance readings showed 150 ohms and the resistance went into the megohm range when the CPU was removed from the socket. Cleaned the LCC socket contact pins and installed a replacement CPU to restore the CLKOUT functionality.
The pod was still stuck in reset but would fail to a 00 error if the UUT self test cable was pushed down into the socket firmly. Disassembled the LCC to pin socket from the UUT cable and cleaned the head contacts and the LCC socket contacts. Reassembled and pod successfully passed self tests.
NOTE: This pod uses the same interface board as the 80186 pod. When used on the 80188 the IC at U5 is not needed and the socket is generally empty. It also only uses one SRAM IC on the CPU board and the middle socket will be empty.
-
Model: Madell CA1640-20 Function Generator/Counter
Symptom: "Sloppy wave forms - badly distorted"
Disassembled unit and tested ESR on all electrolytic caps. Resoldered many cracked solder joints and tested.
-
Model: Fluke 9000A-8080 pod
Symptom: Intermittent self test failures.
If you push on the corner of the socket it passes tests. Disassembled pod and straightened 2 bent pins on the connector between the top and bottom boards inside the pod. Tested.
-
Model: SP3000 Memory Tester
Symptom: All memory fails
Reflowed FPGA on the DIMM adapter board and tested. 6 pins on one corner had broken solder joints.
Tested. DIMMs passed almost all tests - they all failed sp.d test. Research shows this is normal for this tester if the DIMM configuration EEPROM cannot be written to or if the tester is set to Read Only mode. Tested again after enabling sp.d write and was successful.
-
Model: Canon Vixia HFM31
Symptom: USB port dead
Disassembled camera and inspected the jack under the stereo microscope. All 5 surface mount solder connections were broken. Reflowed the solder, reassembled the camera, and tested successfully.
Note: When disassembling something this complex, lay the screws out on the bench top or a towel in order/position they were in on the camera. This makes it much easier to figure out how to reassemble something that has many different size screws.
-
Model: Dremel Moto Shop model 57-2
Symptom: Safety issue: crackled power cord.
This old saw sat so long in the pawn shop that all 3 price stickers on it were sunbleached and unreadable. But, it was only $10 cash. :)
Replaced the power cord and tested. The saw would violently jump over an inch in the air off the workbench. Inspection revealed a missing bolt at the pivot point of the C arm inside the saw.
Cleaned all of the sawdust out of the motor assembly and saw body. Disassembled the nylon bushings and thoroughly cleaned the hardened grease from them, the pivot pins on the motor adapter, the bearing inside the adapter, and the blade latch. Relubricated the blade latch, bushings, C-arm points, pivot, and bearing then reassembled the saw with new Phillips head screws, bolts, star washers, and nuts. Tested by inserting a blade and cutting a double-sided fiberglass PCB.
Threw away the crackled power cord and all of the dogbone headed screws with the exception of the 3 screws that mounted the motor to the saw.
-
Model: TDS1001B Tektronix Oscilloscope
Symptom: Dark screen
Replaced bad CCFL backlight bulb and tested.
The bulbs are 128mm, but standard 125mm bulbs will fit and work fine.
-
Model: TDS1012B Tektronix Oscilloscope
Symptom: Dim light flash on power up then dark screen
Replaced bad CCFL backlight bulb and tested.
-
Model: TDS1001B Tektronix Oscilloscope
Symptom: Dark Screen
Replaced bad CCFL backlight bulb and tested.
-
Model: TDS1002B Tektronix Oscilloscope
Symptom: Dark screen. Missing power button
Replaced bad CCFL backlight bulb and made a replacement power switch button on a 3D printer. Tested.
-
Model: Elenco XP-15 power supply
Symptom: Dead. Missing parts.
Replaced cut power cord. Resoldered connections to the output terminals and tightened the ground terminal. Fixed broken traces on C3 and on the adjustment potentiometer. Tested.
-
Model: Elenco XP-15 power supply
Symptom: Dead.
Replaced bad positive output terminal. Fixed multiple bad solder joints. Tested.
-
Model: Elenco XP-15 power supply
Symptom: Dead.
Resoldered LM317 voltage regulator and fixed 2 broken pads on the adjustment potentiometer. Tested.
-
Model: Elenco XP-15 power supply
Symptom: Dead. Rattles. Power LED not flush with case.
Reattached the heatsink to the LM317 voltage regulator. Fixed multiple bad solder joints and replaced the power LED. Tested.
-
Model: Fluke 9000A-6800 Pod
Symptom: Convert to 6502 Pod
Followed the instructions downloaded from the KLOV forums and cut multiple traces and soldered multiple jumper wires on the top and bottom boards of the pod. Replaced the 6800 CPU with a 6502A and the program ROM with one that had the 6502A pod image on it. Tested.
-
Model: Fluke 9000A-6800 Pod
Symptom: Dead. Attempted conversion by a 3rd party
Followed the instructions downloaded from the KLOV forums and verified the cut traces and patched jumpers. Installed a missing 6502A CPU and tested. Pod failed with a timeout error. Replaced the 6532A IC and retested to the same error. Replaced the program ROM with a freshly programmed TMS2516 EPROM that had the 6502A pod image on it. Tested successfully.
[/quote]
-
Model: Fluke 9000A-8080 pod
Symptom: Fails self test
Pod cable had attempted repairs done to it and was missing 3 pins. Crimped a new replacement ribbon cable assembly and installed it but unit would still fail self tests with a different error. Disassembled and fixed a bent contact on the ZIF socket and retested successfully.
-
Model: Fluke 9000A-6809 pod
Symptom: Fails self test
Resoldered cracked joints on the ribbon cable connectors on the interface board then cleaned the IDP header pins and the self-test ZIF socket. Tested with 6809 and 6809E CPUs.
-
Model: Kurz Kasch arcade tester
Symptom: Horrible hum and sizzling noises
Replaced an internally shorted 8,000uf @15v capacitor and tested the rectifier diodes to make sure the weren't shorted. Removed the internal extender for the C board socket and cleaned the edge connector and internal socket of corrosion. Reassembled and tested by repairing a Space Invaders boardset with it.
-
Model: Craftsman Rotary Tool 572610030
Symptom: Will not spin
Motor is spinning but the tool chuck is not.
Replaced the shattered coupling, part # 2615294309, and tested. The old coupling had deteriorated from age, became brittle, and crumbled.
-
Model: OS-5060A Dual Trace 60MHz Oscilloscope
Symptom: Overbright screen. Cannot adjust focus properly
Replaced leaking diode at D645 and tested scope successfully. Original diode read 385K one direction and 780K in the other.
-
Model: Scanmill CNC mill
Symptom: Dead
The mill did not come with power on keys. Replaced the power key switch and powered the mll up. The PC that came with it did not have software installed to run the mill. Removed the CPU board from the control board and set it aside. Connected a Parallel port breakout board to the controller board and converted the mill to run with Mach3 software. Calibrated movements of the X, Y, and Z axis then tested by milling the sample roadrunner file in Mach3
-
Model: Kurz Kasch arcade tester
Symptom: Blows fuses
A shorted tantalum capacitor on a Space Invaders boardset caused the fuse to blow. After that the fuse would blow again. Replaced 2 1N4004 diodes on the 295A card, replaced the fuse again, and tested.
-
Model: PS-1502D adjustable power supply
Symptom: Cannot adjust
Coarse adjustment pot had its shaft snapped off at the body and one wire on the back side was floating in the air. Sourced a replacement part - a small split shaft linear taper 5k pot - in an electronics surplus store in California, installed it, and tested. Voltage output was fixed and not adjusting. Repositioned the floating wire to the center terminal of the pot after referencing the LM723 voltage regulator data sheet and successfully tested the adjustable output.
-
Model: HP 10529a Logic Analyzer
Symptom: Test and repair
Used the test card and discovered 2 dead channels from the clip and cable. Disassembled unit and reattached 2 broken wires. Reassembled and tested. Checked the universal card for shorted diodes. It was good, but the DPDT switch was broken. Walked owner through how to properly configure the individual IC test cards and will install the DPDT switch after he acquires a replacement.
-
Model: DT-1 DRAM Bank Tester
Symptom: Missing Device Key
Unit was purchased as-is without power supply or the device key. Luckily I own another one of these.
Tester recognized and tested 256K x 4 DRAMs but would not recognize 1M x 1. Reverse engineered the device key from one I owned, built a duplicate, installed it, and tested. Unit would successfully test 256K x 1, 1M x 1, and 256K x 4 DRAMs.
-
Model: Kingwin USB 3.0 to NGFF M.2 SATA Adapter
Symptom: Computer will not recognize drive
USB power/data connector broke loose from the PCB. Reflowed the connector pins and housing to board connections and tested.
-
Model: Data I/O Series 29A
Symptom: Dead keys
Unit had dead keys and keys that bounced. Replaced 9 keyswitches and tested.
-
Model: Sencore TF26
Symptom: Unresponsive
This had a lot of issues. The original test leads had the plasticizer problem and got green goo everywhere, and I mean everywhere. I had to clean the thing inside and out and throw the test leads away then had to clean push button switches 4, 5, and 6 because the plasticizer got in there too!
After that was to disassemble, clean, and lube the 2 slide switches. Next, pulled the PCB and fixed the cracked solder joints on the connectors. then the stuck meter was disassembled and cleaned loose ferrite powder from the mechanism then reassembled it.
Now it worked but had some odd behavior. The manual said to connect all three leads together and push each switch and you'll see the meter go full scale. That worked for every switch except 6. Disassembled it again and pulled the small PCB out for switches 4, 5, and 6. Retested all the switches and they were fine. Found a broken trace where the trace met the pad for the Red test lead's connection to switch 6. Fixed that and reassembled an almost fully working tester.
It needs a new speaker now, but it's an oddball size.
-
Model: SG1638N Function Generator / Counter
Symptom: Intermittent output and low output voltage
Unit had attempted repair issues.
Replaced 3 poorly installed and 1 incorrect voltage regulator - a 7815 was installed where a 7915 should have been. Replaced 2 burned 2N3904 and 1 burned 2N3906 SMT transistors. Replaced 1 burned 20 ohm and 2 heat damaged 100 ohm SMT resistors on one side of the output. Tested. Voltage was up to 5.4 peak to peak from 2.4, but still not correct, and newly installed parts were getting hot. Replaced 2 shorted 2N3096 and 1 shorted 2N3904 SMT transistors on the complementary side of the output. Tested unit. Output voltage was correct at 24v peak to peak and components remained cool.
-
Model: Tektronix 7B92A
Symptom: Dead. Kills power to scope when installed.
Replaced bad tantalum capacitor on the +15v power line. Tested.
-
Model: Protoboard PB-503
Symptom: Burnt contacts on breadboard segment
Replaced 3 breadboard section, a crunchy 1K pot, and a burnt 10K pot. Installed new knobs as the replacement parts were split shaft and the originals were D shaft. Tested. Set the adjustable voltage outputs to +12 and -12v.