Very old Conner CT210 problem

[rd-simone]

Hello everybody,

I have here a very old Conner HDD model CT210 (10.2GB).

It doesn't spin up, so I suspect bad PCB.

As donor, I have a CT210 but not from Conner but from ExcelStor (that acquired Conner, I think). PCB is VERY similar, but FW is different... (I attach pics).

With donor PCB, Conner HDD spins up but makes bad noise (continous TRRRRRRRRR) with heads.

I opened it in clean room and heads SEEM ok.

There is something to transfer from patient PCB to donor PCB or something I can try with this vintage HDD?

Thanks
Simone

pics:
https://ibb.co/LvDXrXz (Patient HDD)
https://ibb.co/89Sh2hd (Patient PCB)
https://ibb.co/JrKbdKj (Donor HDD)
https://ibb.co/0QZzsQH (Donor PCB)

[fzabkar]

U4A and U5 are parallel flash.

[fzabkar]

I notice that the 8-pin IC (part marking?) has a dimple. Perhaps it is damaged?

Here is the brief datasheet for a similar (?) MCU:

L5510 / AIC-5465-DIE, STMicroelectronics, HIGHLY INTEGRATED, AUTOMATED SINGLE-CHIP DRIVE MANAGER AND DISK DRIVE CONTROLLER, 2.5V core, 3.3V logic, QFP-208:
https://pdf1.alldatasheet.net/datasheet-pdf/download/103639/STMICROELECTRONICS/AIC-5465-DIE.html

I suspect that the Vio (3.3V) and Vcore (2.5V) voltages are provided by the transistors at U12 and Q1 (right hand edge of PCB).



MX29F100BTC, Macronix, 1Mbit [128Kx8/64Kx16] CMOS FLASH MEMORY, 5V, TSOP-48:
https://www.datasheetarchive.com/datasheet?id=2939697e74bfbe5cb9f894c09453552e9260b2&type=M&term=MX29F100

M29F102BB, STMicroelectronics, 1 Mbit (64Kb x16, Boot Block) Flash Memory, 5V, TSOP40:
https://pdf.datasheetcatalog.com/datasheet/SGSThomsonMicroelectronics/mXyyqus.pdf

FDC6561AN, Dual, N-Channel, Logic Level, POWERTRENCH MOSFETs, 2.5A, 30V, 95mOhm RDSon, marking 561 / 561x, TSOT23-6:
https://www.onsemi.com/pdf/datasheet/fdc6561an-d.pdf

[fzabkar]

Could U11 constitute a supply for the preamp?

The DRAMs ...

SM81C256K16CS-35, Silicon Magic, 256K x 16 EDO DRAM, 5V, 66 / 83 / 100 MHz, TSOP-44:
https://www.ic72.com/pdf_file/s/11555.pdf

IS41C16256-35T, ISSI, 256K x 16 (4-MBIT) DYNAMIC RAM with EDO PAGE MODE, 5V, TSOP-40:
https://www.mouser.com/catalog/specsheets/issi_IS41C16256.pdf

[kotel]

Doesn't spin up as in theres no attempts to spin or the motor attempts to spin up, but can't?