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Author Topic: Apple II+/IIc/IIe/IIgs/III Computers  (Read 15147 times)

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Offline channelmaniac

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #20 on: March 14, 2015, 11:41:14 PM »
Model: Rana Systems Elite One floppy drive
Symptom: Random read errors

Cleaned and lubricated drive. Tested.
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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #21 on: March 14, 2015, 11:42:45 PM »
Model: Apple 3.5" disk
Symptom: Would not eject

Cleaned and lubricated drive mechanism. The grease had turned sticky and was causing the drive eject motor to bind and stop.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #22 on: March 17, 2015, 05:51:29 PM »
Model: //e 80 Column / 64k Memory Expansion card
Symptom: Bad RAM

Fails self test with an error of *1 0 0 0 0 0 0 0

Replaced bad RAM at location 8 and tested
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #23 on: March 17, 2015, 05:52:11 PM »
Model: Disk II interface card
Symptom: Missing chip

Replaced missing 74LS05 IC and tested
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #24 on: January 01, 2017, 08:57:17 PM »
Model: Jameco 16K Language Card (For Apple II+)
Symptom: Crashes computer when installed

Replaced a bad 74LS09 and a bad 74LS175 IC chip. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #25 on: June 06, 2017, 05:56:26 PM »
Model: Apple IIc
Symptom: Dead, flashing garbage on screen. All the RAM chips get very hot.

Board had a short across 2 of the large tinned contact areas on the front left corner of the board. This shorted approx 17vDC across to the +5v bus.

Replaced all 16 RAM chips and tested
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #26 on: July 30, 2017, 11:14:46 AM »
Model: ZIP GSX accelerator for IIgs
Symptom: Will not boot.

Unit had damaged components and attempted repairs.

Removed the old 70ns cache RAM and the .600" sockets and cleaned up the board. Installed .300" sockets and replacement 25ns cache RAM. Removed the 2 burn damaged DIP switches and installed new ones. Removed cut pins from the board and installed replacement tantalum capacitors. Removed hacked on crystal oscillator, installed a new oscillator socket and patched damaged traces. Tested board with a 28, 32, and 33.333MHz oscillator successfully.

CPU on the board was too slow to work with a 40MHz oscillator in accelerated mode. Now that the faster RAM is installed, customer is ordering a higher speed rated CPU to test further overclocking of the accelerator.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #27 on: November 14, 2018, 09:11:58 PM »
Model: Bell & Howell II+
Symptom: Dead. Garbage on screen.

RAMs tested good in a NeoLoch Inquisitor. CPU tested good in a test jig. ROMs tested good in another II+ main logic board.  The 74LS153, LS174, and LS257 chips that control the inputs, outputs, and data line multiplexing tested good. Found a 74LS157 with a dead output on pin 7 at location C12. Replaced it and tested the computer.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #28 on: September 28, 2019, 06:40:36 PM »
Model: Apple IIc w/memory expansion
Symptom: Dead. Graphical checkerboard on screen

Replaced dead 65C02 CPU. Reinstalled memory expansion board and tested - failed RAM. Replaced bad 74LS173 with a rotted pin on the memory expansion board and tested again, successfully.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #29 on: November 26, 2019, 11:14:22 PM »
Model: Apple II+
Symptom: Dead, garbage on screen, missing a chip

Replaced missing 9334 and its socket. 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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #30 on: November 26, 2019, 11:14:58 PM »
Model: Apple II+
Symptom: Dead, missing IC

Another one with a missing 9334 chip and bad socket. Installed a new IC and socket 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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #31 on: November 26, 2019, 11:15:52 PM »
Model: Apple II+
Symptom: Dead

Replaced missing 9334 chip and its bad socket. Replaced bad 6502 CPU and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #32 on: November 26, 2019, 11:17:32 PM »
Model: Apple II+
Symptom: Dead, no power

Replaced bad fuse and bridge rectifier in the power supply. One of the HV side capacitors failed during testing. Replaced all 4 high voltage side capacitors and tested.

The bridge rectifier was not fully shorted, but instead had a leaky diode. This damaged the capacitor and caused it to fail during testing.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #33 on: November 26, 2019, 11:21:10 PM »
Model: Apple II+
Symptom: Will not boot. Sometimes boots to software monitor prompt

Used a donor leg from another IC to fix a broken pin on one ROM. Fixed 2 bent under pins on 2 ROMs and tested. Replaced one bad RAM chip in Bank 0 and retested successfully. Installed the customer's 16K RAM card and successfully booted DOS and loaded Integer Basic onto the card.

Made and installed a replacement keyboard cable.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #34 on: May 22, 2020, 07:32:23 PM »
Model: Apple IIe
Symptom: Dead

Replaced one exploded main filter cap and the 220uf @ 10v cap next to the main switching transistor. Replaced blown fuse, removed the RIFA cap, 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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #35 on: September 15, 2020, 08:56:48 PM »
Model: //e Platinum
Symptom: water damage

Swapped the customs, ROMs, and CPU over to a replacement parts motherboard. Tested. Replaced 5 keys on the keyboard and tested. Replaced bad speaker and retested.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #36 on: September 15, 2020, 08:58:36 PM »
Model: //e Platinum
Symptom: Dead

Replaced 2 1uf@35v and 1 10uf@35v capacitor in the power supply. The 2 1uf caps had leaked and electrolyte was cleaned up. Tested. Replaced bad F key and Caps Lock key. Retested.
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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #37 on: February 23, 2023, 01:27:17 PM »
Model: //c
Symptom: Dead. No video output.

Replaced bad video jack and tested. Dead with garbage on screen. Upgraded from ROM FF to ROM 03 and tested. RAM Error ZP 10000000. Replaced RAM chip 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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #38 on: June 03, 2023, 12:39:24 AM »
Model: Apple IIe
Symptom: Smoked

Opened the power supply and removed the fried RIFA cap. Cleaned the leakage and smoke damage out of the power supply then recapped it. 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: Apple II+/IIc/IIe/IIgs/III Computers
« Reply #39 on: June 03, 2023, 12:42:18 AM »
Model: Apple IIe Astec power supply
Symptom: dead

Replaced shorted Q2 (bottlecap transistor), shorted SCR, and a smoked R17. Recapped the power supply and tested. Power supply made a loud repeating CRACK CRACK CRACK sound. Found a broken wire on the bottom of the leg on part of T3 that connected to the base of Q1. Reattached the wire to the top of the leg and tested successfully.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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