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Author Topic: Shop Gear Repairs  (Read 23311 times)

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Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #20 on: June 20, 2015, 09:26:04 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Shop Gear Repairs
« Reply #21 on: October 12, 2015, 06:21:38 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Shop Gear Repairs
« Reply #22 on: November 13, 2015, 10:49:18 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Shop Gear Repairs
« Reply #23 on: January 08, 2016, 07:02:06 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #24 on: February 01, 2016, 09:29:52 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Shop Gear Repairs
« Reply #25 on: February 01, 2016, 09:32:49 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #26 on: February 05, 2016, 09:59:21 PM »
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.
« Last Edit: February 06, 2016, 04:20:03 AM by channelmaniac »
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #27 on: February 06, 2016, 04:19:11 AM »
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:

Code: [Select]
Cable - IDP
 37   -  39
 38   -  38
 39   -  40
 40   -  37
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #28 on: February 07, 2016, 07:06:09 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #29 on: February 11, 2016, 07:31:28 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #30 on: February 11, 2016, 07:37:40 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #31 on: February 24, 2016, 07:53:14 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
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Re: Shop Gear Repairs
« Reply #32 on: April 06, 2016, 07:47:04 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #33 on: May 08, 2016, 02:25:27 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #34 on: May 09, 2016, 07:10:21 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Shop Gear Repairs
« Reply #35 on: June 12, 2016, 06:11:25 PM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
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Re: Shop Gear Repairs
« Reply #36 on: October 24, 2016, 10:01:42 PM »
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.
« Last Edit: October 30, 2016, 11:57:48 AM by channelmaniac »
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
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Re: Shop Gear Repairs
« Reply #37 on: October 24, 2016, 10:02:34 PM »
Model: TDS1012B Tektronix Oscilloscope
Symptom: Dim light flash on power up then dark screen

Replaced bad CCFL backlight bulb and tested.
« Last Edit: October 30, 2016, 11:57:05 AM by channelmaniac »
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
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Re: Shop Gear Repairs
« Reply #38 on: October 30, 2016, 11:54:19 AM »
Model: TDS1001B Tektronix Oscilloscope
Symptom: Dark Screen

Replaced bad CCFL backlight bulb and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
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Re: Shop Gear Repairs
« Reply #39 on: October 30, 2016, 11:55:34 AM »
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.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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