wd5002_abys 做44、46错误，磁头损坏。如何处理？

duckyer

wd5002_abys 做44、46成功，46有错误，磁头测试损坏。如何处理？

WDC WD5002ABYS-01B1B0 FW:02.03B02 SN:WD-WCASY3257948 (ROYL selected) port 0xA000
Logical: Cyls 16383, Heads 16, Sectors 63, LBA 976773168, 500Gb
Controller Buffer Size: 16384Kb
Family: Atlantis_RE (Royl)

SPT Defect Statistical Chart
Head 0 = 494     ( Tracks: 69     , Sectors: 425    , Max: 53330  )
Head 1 = 518     ( Tracks: 57     , Sectors: 461    , Max: 53330  )
Head 2 = 347     ( Tracks: 57     , Sectors: 290    , Max: 53330  )
Head 3 = 618     ( Tracks: 62     , Sectors: 556    , Max: 53330  )

2023-02-16 08:08:44 All Steps: 59, Current: 57
2023-02-16 08:14:04 Load Permanent Overlay - SUCCESS
2023-02-16 08:14:04 Load Transient Overlay - SUCCESS
2023-02-16 08:14:04 Load Calibrator to PST slot - SUCCESS
2023-02-16 08:14:05 Load DCM to PST slot - SUCCESS
Task:  D - ARCO Reserved Area
Hex:   19
Heads: 6
Madia: K
2023-02-16 08:14:07 Calibrator - Start
2023-02-16 08:14:07 Calibrator Init - SUCCESS
2023-02-16 08:27:27 Calibrator End - SUCCESS
0001 - SUCCESS
01 - SUCCESS
0001 - SUCCESS
01 - SUCCESS

0121 - UNKNOWN ERROR 3603
2023-02-16 08:37:46 Power On Reset Immediate - SUCCESS
WDC WD5002ABYS-01B1B0 FW:02.03B02 SN:WD-WCASY3257948 (ROYL selected) port 0xA000
Logical: Cyls 16383, Heads 16, Sectors 63, LBA 976773168, 500Gb
Controller Buffer Size: 16384Kb
Family: Atlantis_RE (Royl)

0121 - SUCCESS


Write Test on Track -4, Num Heads :4
---------------------------------------
Head 0 - GOOD
Head 1 - GOOD
Head 2 - GOOD
Head 3 - GOOD
2023-02-16 08:43:31 Load Permanent Overlay - SUCCESS
2023-02-16 08:43:31 Load Transient Overlay - SUCCESS
2023-02-16 08:43:31 Load Calibrator to PST slot - SUCCESS
2023-02-16 08:43:32 Load DCM to PST slot - SUCCESS
Task:  F - ARCO User Area
Hex:   32
Heads: 6
Madia: K
2023-02-16 08:43:39 Calibrator - Start
2023-02-16 08:43:39 Calibrator Init - SUCCESS
2023-02-16 12:07:57 Calibrator End - 72DC=UNKNOWN ERROR 72DC  - UNKNOWN ERROR 72DC
做44、46错误加了Permanent Overlay，44成功。46有错误， 内部低格退出，磁头测试，4个磁头全部BAD。更换ROM,磁头测试，磁头全部坏！难道电路板损坏了！

duckyer

用1640电路板测试磁头，4个头全好。1640板Tahoe_LT的rom不敲头，Tahoe_xl 敲头，还没有写1640板的固件，不知道能不能出盘？不知道能不能用1640电路板代换1537？证明盘体是好的。只能够搞一块1537电路板了！

duckyer

磁盘电机旋转，没有磁头寻道的动作，看来是原电路板的磁头循迹驱动电路坏了或脱焊了。

duckyer

  Rf = 5.6k, Ri = 2.5k, Rs = 0.25Ω and Gs = 4.5V/V
Rs = 0.25Ω, Lm = 0.75mH, Rm = 7.5Ω, Gs = 4.5 Gpow = 8, Rf = 5.6K, Cc =
3.3nF, Rc = 33k 磁头循迹电路没有几个元件，看看是不是脱焊了。

duckyer

又测试了一下原来1537的电压，发现测试点P2的电压居然4.20v！远高于1640的2.5v，证明电机驱动电路L7251的2.5v稳压输出电路坏了。2.5v提供88i8845内植内存的供电，悍掉D1处串联的L2，外加2.5v到L2输出端，看看1537电路板能不能正常工作？！

duckyer

外加2.5v到L2输出端，1537电路板，磁头仍然不工作、不循迹磁道，主芯片88I8845内置内存，应该坏了。