Electronics > Repair
HP 53310A - Power supply troubles
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SoundTech-LG:
I have a different theory now. Having acquired another 53310A, as well as a 54501A for parts (PS in particular), I now can see 3 different Revision PS boards J, L, & E. They do not seem to correlate chronologically with the age of the instrument. I think maybe HP had a huge stockpile of these supplies, and used them, in no particular order. My original 53310A is of the first generation (Made in U.S.A.) circa 1988, (Rev J PS). The latest one, from what I can tell, Made in Korea, 1997 date code marked on the Lithium backed NVRAM (Rev E PS). The scope, was mfg'd early 90's if I remember correctly, and using a (Rev L PS) . I do not know what changes were made in each Rev.
The latest manufactured 53310A came to me with the earliest Rev PS. (Rev E)

So the Rev E supply has no signs of leakage, smell, or corrosion.
The Rev J supply has no signs of leakage, smell, or corrosion.
The Rev L supply from the scope is basically a swamp of sticky, stinky cat pee smell, and corrosion to the screw heads, some circuitry corrosion around the smaller components. It appears it was stored on it's left side (CRT side down), because the swamp was draining out that side, even down the 20 pin connector and cable. The L Rev board also had a look of a shiny coat to it everywhere, and a darker green appearance. Possibly some kind of conformal coat.

Considering all this it makes me think, there may have been some bad production run/s on these caps.
Wouldn't be the first time. It would be interesting to know the Rev levels of other PS boards in these instruments, and the conditions of the boards.

Tomorokoshi:
Data on my power supply:

HP silkscreen:
Hewlett Packard P/N 0950-1879

Manufacturer's part label:
Computer Products
XL131-3604E
115/230VAC
3.0/1.5A
50/60HZ
CSA LR50913

Manufacturer's serial label:
P/N: 700040-01
S/N: HPQ S173
REV: S
DATE: HD36S

Agency label:
"TUV Product Service"

Written on PCB:
"790019 REV. S"

PCB information:
"COMPUTER PRODUCTS BOSCHERT INC"

Date code 9301 on Q3 transistor in power supply.

No RIFA yellow capacitors. No observed leakage or bulging capacitors.
syau:
Data on my power supply:

HP silkscreen:
Hewlett Packard P/N 0950-1879

Manufacturer's part label:
Computer Products
XL131-3604E
115/230VAC
3.0/1.5A
50/60HZ
CSA LR50913

Manufacturer's serial label:
P/N: 700040-01
S/N: HZW 0195
REV: S
DATE: HE36S

Agency label:
"TUV Product Service"

Written on PCB:
"790019 REV. S"

PCB information:
"COMPUTER PRODUCTS BOSCHERT INC"

No RIFA yellow capacitors.
Few 1000uF capacitors show sign of leakage on removal.
SoundTech-LG:
Thank you for the info...

Once I dipped the 54501A PS board in 99% IPA overnight, it lifted a considerable amount of gooey stinky slime. Pulled all 14  1000uF 35V caps. A bit of goo under there.  Rather than clean off 1/4 pound of solder I twisted the caps off, after pulling all the bent over leads, heated the mounds of solder and pushed a small drill bit through. Saved considerable time. I had a whole bag of 50V Panasonic caps. They were fatter, and shorter, but made them fit, and NO, I did not bend over each lead, like Boschert did. Simply inserted, soldered, and clipped off the the leads. Works good now. I also found a corroded meter Pin jack at the 5.1V PS test point next to the pot, that corroded right off. This was supposed to be a parts item, now working...  oops not so fast...  it also needs a NVRAM/battery combo Dallas. Well it can still be parts. Most of the case parts, CRT, CRT board, PS, all in common with 53310A. This scope also came with the nice HP Rack mount with 4 BNC Front Panel connectors. Immediately came off, and went to the 53310A.
m3vuv:
any idea what caps c32 and c34 are?
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