C-Lab MK2 CA401332-002-REVC / Repair/Restore log

[Steve]

I have a feeling this poor drive has seen better days, it makes sounds like it's trying to dial-up to SCSI heaven:


Although it did show up as detected once, I haven't able to get it detected again since:

PXL_20210112_154913150.jpg

[exxos]

I have a feeling this poor drive has seen better days, it makes sounds like it's trying to dial-up to SCSI heaven:

wow, is the motor actually running ? Kinda sounds like its stuck.

[Steve]

It is spinning... just sounds like a dial-up modem when it tries to read.

[stephen_usher]

It looks like someone has had it open, given the broken warranty seal.

[MegaSTEarian]

Sounds painful :shock:

Hope the customer hasn't got any data in there.

On another note, how easy is to source an HDD like this?

[Steve]

I think old small 2.5'' scsi's like this would be hard to find. My customer should have his data backed up to tape so hats good.

I'll be recapping the PSU and motherboard next, I'll post photos when I get to it.

[Steve]

BIG UPDATE ON PROGRESS

* Openflops drive installed
* NVRAM replaced
* FPU installed
* Recapped PSU
* Recapped Mobo
* SCSI Terminator installed
* Wait states disabled to increase TOS speed
* Silence fan by wiring to 5v instead of 12, clean dust.

RECAP POWER SECTION
~ BEFORE

power_section_before.jpg

~ AFTER

power_section_done.jpg

RECAP AUDIO SECTION
~ BEFORE

audio_section_before.jpg

~ AFTER Using top-quality Nichicon audio-grade golden caps

audio_section_after.jpg

RECAP MODULATOR SECTION
~ BEFORE

modulator_before.jpg

~ AFTER Note: the 470uf C24 cap is installed the / CORRECT / way, as it is marked incorrectly on board/schematics

modulator_after.jpg

MAKE UP 4700UF MAIN CAP

4700uf_cap.jpg

4700uf_finish.jpg

SILENCE FAN BY WIRING TO 5v & CLEAN DUST

wire_fan_to_5v.jpg

ADD INTERNAL SCSI TERMINATOR (So external drives still work without internal drive)

scsi_terminator.jpg

INSTALL EXXOS NVRAM

nvram_before.jpg

nvram_gone.jpg

NVRAM FINISHED & CAN SEE NEW FPU IN BACKGROUND

nvram_after.jpg

PUT TOGETHER FLASH FLOPPY DRIVE

build_flashfloppy.jpg

~ TEST DRIVE

flashfloppy_test.jpg

INSTALL NEW CF CARD

cfcard_secured.jpg

MOBO FINISHED BEFORE RE-ASSEMBLY

mobo_finished.jpg

TESTING BEFORE CASE FITTING

test_after_shielding.jpg

CLEANING
Cleaned and disinfected with 99% IPA & Keyboard vacuumed of any dust

cleaning1.jpg

cleaning2.jpg

[Steve]

WAITSTATES DISABLED FOR FASTER TOS SPEED

waitstates_before.jpg

waitstates_after.jpg

PSU RE-CAP

PXL_20210119_170434552.jpg

PXL_20210119_173043097.jpg

[exxos]

Assume you replaced the ROM ? The original ROM will bottle out after a few hours normally.

[Steve]

Assume you replaced the ROM ? The original ROM will bottle out after a few hours normally.

I checked and this rom has the exact same serial number as the one in your store, so I think it is a fast rom (assuming serial number is a factor) I will of course run benchmarks and tests in the next few days.

@exxos check the fan silencing photo, you can see the ROM there.