Repair Briefs - Test Gear, Industrial and Boating gear, Computer.
The following are repair briefs for various
equipment.The infomation is directed
to technically competant repair engineers.Generic terms have
been used to make this info less model specific,eg terms like
replace transistor Q123 have not been used.
The equipment is Test Gear, Industrial and Boating gear, Domestic and miscellany , computer.
I would be interested in finding
any other repair listings on the internet structured as i have
done ie intended to be less model specific. For convenience using search-engines,
use keyword divdevrep to target these files.
There is no point in contacting me about any of the following, the
repair job may have been done 15 years ago .
I cannot clarify or enlarge on any of the following. Mains is 240V, UK.
Should the location of this file change please use the keyword "divdev7" in
a search engine to find it again
A number of the pictures are now apparently not downloadable, because the hosts have disallowed
remote link
Sony CRX 230EE , CD R/W
Clanks but no tray opening.
Eventually a fingernail unde rright hand side aiding while powering on ,
let it open. To assist taking apart , leave the tray open before disconnecting power and ribbon leads.
Remove the bottom cover then reconnect the leads , lift the plastic CD lifter arm while
pressing the tray button if the tray is inside.
Unclip the sides of the front to allow sliding over the open tray and the small slack drive belt
can be easily removed, 58mm circum of the old stretched belt.
If replacement belt is too tight then difficult to manually close the tray , if too slack
then the motor will not spin on manually closing the tray, both with no power connected.
Sony PSP 3003
Leave the 2 screws in apse shaped end of casing. Don't disconnect
ribbon to power sw unless necessary as very fiddley to remake
Arcing and sparking reported. 2x3mm piece of broken off spark erroded
phosphor bronze spring dropped out of the case, on opening. This came from a
2 way power socket of size that could probably take mains V but not 2A it
would seem, wired to the power-in connector and position under the LCD.
Between that and fuse? marking F6602 2.5A on the overlay, a large area of
smoke staining. Cleaning off most of the smoke, one 2 land SMD seems a bit
pitted and which lump is / was? the fuse , some spark erroded pcb trace,
anyone know of a decent pic of this area.
http://www.llamma.com/PSP/repair/images/PSP_fuse/Td-Fuse.jpg
off
http://www.llamma.com/PSP/repair/PSP_fuse_repair.htm
seems a different model, the white block , the 2 wire connector to power
socket is the same
a component that size, as far as I can trace, is the only link to the rest
of the mobo and is o/c to ohms and 2V diode test. It is not burnt-pitted as
I thought but is a neat designed pit and otherwise no burnt appearance. Has
a labelled cover blown off , perhaps the fusing element passes through this
pit to the other land. Being black and only x30 scope, difficult to make
out, let alone probe
Pit was rectangular about 100 x 150 micron, off centre, with a small blob of
ex-molten ? metal, no hole seen set in another very shallow depression about .2x.3mm .
Decided that was the 2.5A fuse not the
5x3.5mm "tensile test piece" shaped intact metal lump nearer the marking.
Under some tinplate screening there were 2 more of these 1.8x.8mm lumps this
time marked LB , not blown apart and 1A on overlay, F0011 open , F7001
closed.
Bridged the first with 3A fuse and second with 1A. Now have current from 5V
supply , pulsing from base level of 5mA to 16mA draw, power sw moved to on
or not, battery in or not. Better than my previous likely timewasting-
inside a Kodak digital camera. Now to find time to track down where the
powerFET is. I would have thought such basic tech info would be out there
somewhere, a "roadmap" of major components, obviously not a schematic
While at it ,the battery only measures 1.26V
Rs nearby all in cct 4K, 1200, 330, 680R
3 land SMD diode? tested .4V between 1 pair only, marked 01 or 10 topmark
At least the one I looked at failed for a respectable reason, Owner decided
to use an opposite polarity supply.
This PSP looks as though it initially failed from pbfitis at the solder
point of internal secondary power connector at the pcb trace, then heat
melted plastic , arcing broke a bit of phosphor bronze . The user accessible
power soocket , unusually, is nicely decoupled from user induced mechanical
failure as it uses wire tails, not soldered to pcb of any sort
BNOAA or BN0AA, B at start not 8, probably DC-DC converter, any knowledge?
3 off them with fuse at p3 to p6 connected
Hopefully with PSPs , the schottky across the i/p and 2.5A fuse , would
knock out fuse before shottky going o/c, in reverse powering. Kodak seemed
not to have that basic protection. Hot chippery resulted in the kodak case.
At least I learnt how to deal with ultra miniature 0.5mm spcing ribbon
connector ALPS KS 8E302 (30x microscope read this), wedge goes in the other
way to usual and see-saw style grip to the ribbon lands. Nothing elucidatory
googling on that connector system. Re-reading this connector not ALPS logo
but read as IRS M8 , other connectors AD3 or Mitsubishi logo for the A
IR5 , AK3
Uses black wedge between pins on the open end of the housing, away from the ribbon.
When assembled the top layer of pins are visible over the holes in the black
and electrical connection via the covered pins under. Wedging the top pins
seesaw style to grip the lands on the ribbon. To reassemble packed out over the
pcb with cloth tape and then wood wedge of a clothes peg to push black wedge into position
whith a finger nail over and making sure the ribbon is home in the housing
I think this "tensile test piece" 5x3,5mm is the tab of the powerfet, active part
completely blown off the tab and as no trace of die, presumably isolated tab
, as also on a ground plane. Or could the 0V line be switched? Cannot even
see what orientation as no top-side traces to G,S,D and no pads seen.
Desoldering the tab and then desolder wicking does not totally remove the
solder and just a neat solder rectangle on the pcb, very odd.
Bat+ and Si diode nearest L speaker on mobo, other end to gnd.
Power in only found at the on board socket, Bat+ also nearby and nowhere else
found on the mobo. So whatever was burnt and blasted away was probably main
power powerFET pass tr and battery charger
Statcounter problem
"A link to the database server 'b019' could not be established."
auto password entry failure trying to login,
"safe mode" text only page emerging or locked out totally, all something to do with
using Firefox browser.
Go away to other sites and return to statcounter URL in
another window then whatever the hickup has cleared. Alternatively
go through a proxy like anonymouse or loband.org
Switch mode power supply failure mechanism?
I have a use for one of these all new unused in 1990s, not stored in a shed or garage over the years. A few dozen ,made in 1992 nice compact 70W Electronic Halogen Transformers (so called including labels as primary and secondary on the external label). Outputs the unrectified HF to drive the 12V lamps. They used to work 15 years or so ago. Now I've tried 3 and all the same , should be 12V HF ac and if attached to high speed diode and a cap and no load then about 10 to 12V dc. No way will they power even a 20 W lamp (supplies are rated 20W to 70W) tried 40W in case load dependent. Scoping, with no load and a complex oscillation signal. Then as little as 27R load very poor mark space ratio of output and fraction of a volt as DC. These units are potted with that white hard-rubber-like stuff but I have one that I excavated out a lot of the fill and that is the same fault. No green corossion stains or oil films seen associated with any components still in the fill (only removed enough to check what components were in there.
Philips EHC 070 S/40 , no controller IC , 2 STL57 driver transistors and the small componentry as SMD on a small daughter board. Stable 350V on the rectified mains caps, polyester, no electrolytics at all in these units. Transformer is good up to 1Gohm on insulation test. Fuse and thermal fuse in the exposed one are good
There are no electrolytics in there, do non-wet caps suffer from that sort of failure? Only polyester or ceramic caps in there AFAICS. Got me thinking, This is quite early SM so perhaps MLCC failure due to silver migration on one or more of the chip caps on the small daughter board, I'll try testing for ohmage/varying ohmage
I'll try powering up some more, but as they are fully potted it would be just go/no go. I had an exploration of the SM caps on the excavated one and nothing stood out. There is one cap on the main pcb that is dark red , maybe silvered mica, I will excavate the remaining "pottage" and desolder it and test for silver migration. Then isolation transformed and scoping the live board as now I've started I've got to get to the bottom of what could be a smps generically fault process. I don't usually have a batch of all the same anything to look over
I powered up 6 more. 3 bad a short duration glimmer, 3 usuable, but not quite right.
IIRC these could have the lamp load connected at power up. These 3 will not do that but connect load after powerup and will power 20W test lamp ok. So presumably something has gone wrong with load sensing/demand somewhere, what to look for in the open exposed one?
Sygate Personal Firewall 5.6 problem with Windows 2000
Installs but at first live startup generates popup message saying
"smc.exe has generated errors" , "error log has been created"
Download version 5 and install, maybe other version between 5 and 5.6
would also work but not tried.
Thunderbird mail+usenet application
Email messages annoyingly disappearing with no reason then a
Pop up messages glimpsed in bottom left corner "2 messages deleted from Inbox".
Seems default is to do this for some weird reason
In Tools/account settings/ disc space
Delete messages more than 14 days old was ticked, change to don't
delete any messages
Twinhead Supernote SX laptop / notebook computer.
I never powered up at first sight as the ribbon cable to the LCD screen was
obviously damaged so don't know what the screen appearance was. Usual long term
flexure at the hinge problem. Replaced the phenolic
brown section of the ribbon to the LCD with standard ribbon cable soldered at one end to
the sort of in line connector in the hinge area and the solder points on the pcb connector
on the daughter board. Could not find much component level info on laptops so here is
some further detail. To open the screen surround; remove the Twinhead label and 3 rubber
bumpers. When surround removed refix the small hinge side back to the body. To remove
the keyboard undo screws and 2 pot knobs and unclip the surround from left and space bar edges and then pull
and lift away from the screen end. The 3V memory battery is located under the cartouche shaped
label under the m/c.
High voltage back light supply. Comes on a couple of seconds after main board power-up.
Mounted under screen in raised pod. 4 wires in - 2 wires out. The T5001 TI SMD in operation
had pin1 6.7V,p2 12.4V,p3 1.6,p4 1.6,p5 .7,p6 3V,p7 1.6V,p8 .5V measured to battery neg.
12Volt pulses on Tx primary/C8 Cap of about 40 KHz. Putting DVM (2KVolt range) on the Tx o/p
loaded and stopped back light. Connected in series between the
2 backlight wires 100 M ohm,1N4006 and 220nF and measured with DVM
voltage over 220nF,should have used high f rectifier but never mind. On first applying DVM
measured rectified voltage greater than 4V dropping to steady state
of 1.1 V all
with the LCD illuminated at the same time.
The secondary resistance of the TX was 215 ohm so step up pulse voltages must
be well in the hundreds (3KV rating capacitor on output).
Changing brightness reduces the pulse amplitude.
With drive disconnected
the 2 wires to the backlight registered 55pF on a 1KHz capacitor meter and no apparent
resistance on 20M DVM range.
On the main board the Linear Technology LT1170CT showed 1.6,1.7,.4,5.4,5.4 volts
relative to battery negative. CMOS setup for Conner CP2064 was spare type number
with 823 cyl,4 heads,0 pre,0 LZ,sec 38
Ubiserfer DW-UB04
splash logo screen display only then goes to white, no function
12sc + 1 under the CE label
2 machine sc go under the keyboard. Next time remove this keyboard fist, those 2 sc and a needle point in the 4 metal
protrusions out of the top row of the
keyboard in the recess of the casing, lever inwards and up.
open up display section, unplug con and ZIF ribbon (pull clamps outwards)
Central pcb missing with the reset sw under the hole in the case
Small RF ? screen lead from display , thru hinge to between 2x USB to a micro SMA
type conn, function unknown
Battery remove outer blue only , not the thickish metal+plastic grey inner packaging.
No voltage measured ove rthe ext batt cons. Get inside and 2.8V over the battery end pads.
Bench ps charged battery to 3.8V via the wires solder points and measured over the ext points. so the SMD device more than
a diode, something active as a lockout
Umax Vista S6E scanner
Steel chassis holding interface sockets slides out rearwards when loose
USB to RS232 converter
This old kit works well with "macros" via Hyperterminal to 25 pin RS-232 and
Win98 but it has to go out on the road so control via a netbook pc would be
ideal. In the meantime of getting a USB to RS232, tried porting win98
hyperterminal to Windows 7 just to see if it will at least open on that OS
but bugger me 7 OS/ Explorer hides DLL files and cannot copy/paste the
hyperterminal .dll from thumbstick, you can't change .dll to .txt or something , to copy across either
I've unzipped the hyperterminal1
http://files.digitizor.com/wp-content/uploads/2009/08/hyperterminal1.zip
and obtained a USB to
RS232 converter "dongle". The Win7 complient driver opens ok under win7 and
established a serial port as COM3 (in Device Manager) on plugging in.
Opening hyper, set up a 9600 serial. The intended use is 25w D serial . So
far I was a bit rushed and think I had 2 hypers up and operating into COM3 ,
but no LED flicker connecting pins 2 and 3 together on a RS232 checker with
25 to 9 adapter.
My error, only found when I closed down the win7 m/c, and 2 hyper apps to
force closure to.
Just tried again and now LED flicker commensurate with baud setting and
ASCII text echoed to screen for text file "sent" with pins 2,3 xconnected.
So when I can clear the decks and get back to the real use, it should work,
thanks for the assistance in unravelling this topic.
Since CP/M days and dumb terminals I've always checked an RS-232 link with
simple LED checker that I made a mod to, of a switch between p2-p3, to
check that if ascii is sent then ascii is echoed back to the VDU (termed in
those days ISTR) and not garbage on the screen and the LEDs flicker at a
rate varying from slow 110 baud to whatever fast upper setting.
Another reminisce , I first went onto this internet malarcky with a 300 baud
modem
This is UK "Maplin" badged 10 quid USB-RS232 converter with Prolific chipset
with win7 on the box and a CDrom. As always? with these adaptors the spec on
the box or manual only refers to speeds up to ... , never down to .... , T
got no help from store "assistant". There was an engineer in the shop when I
was there, saying he uses exactly those ones for updating/transfering from
laptop USB to RS232 industrial process controllers, sometimes at 2400 baud
and usually 9600 baud.
As the assistant said, "I've learnt something today "
Removed a sticker and can just read through the blue translucent plastic, 28
pinner is PL2303 then suffix HK or HX perhaps, the other 28 pinner or so
not readable
E no. is clear
E315599
unzipped on win7 starter
http://files.digitizor.com/wp-content/uploads/2009/08/hyperterminal1.zip
to paper tape speed 110 baud the LEDs flicker pedestrianly on the serial
line checker so presumably can go from 110 baud , through the required 9600
to the 500K or whatever
I measured, wuth checker LED load, -10V on one of the pins of this Maplin/prolific one.
The converter works where intended and the piece of kit can now be taken out
on the road and function changes made via a win7 10 inch notebook pc rather
than win98 desktop machine.
Can also be used for Win7 to old 28K telephone modem via win7 / USB and the dial-up option
and dialup inteconnect section of the WiFi connection utility.
Aide Memoire for use with win7 notebook pc, use USB next to the SVGA conn.
Open hyperterminal/open stored file/
Requires an image on the video projector screen before going into menu mode.
Go into properties/ settings/ ASCII settings and for this projector and 9600 baud
set character delay to 20mS and line delay to 1000mS
Send text file menu, enter, directions etc
Colour wheel delay time left at 433
UnzipThemAll problem with eservice .rar file
Run-time error '91'
Object variable or with block variable not set
Highlight all related part rar files before clicking on start
Windows 7 starter
Annoying Norton pop-ups. As if repeatedly chucking ads at you is going to make you
more likely to buy their product.
Use decrapifier application , does what it says on the tin
Windows SP4 Service Pack installed - then near dead pc
Win2k installed SP4 fine but on reboot it gets to the flying window pane
and then shuts down the power supply just like pressing the machine reset
button.
Then just cycles through this route and never opens windows.
Same trying "Safe Mode" or other f8 options,
also "repair" from original CD or from the 4 floppy start up / boot disks
does the same.
Can only put old DOS on a: drive but cannot access c:
in any way.
Recovery Console just allowed to check
the c: file structure and nothing much else
Tried fixboot , fixmbr from the CD but still no windows access in safe mode.
HD plugged in as D: on a friend's pc with XP, same file structure.
Didn't have to change BIOS setting or anything other than a virus scan,
to copy across to CD-rom, to rescue files.
Wxtide32 Tide calculator.
If your pc keeps latching up if you stray too
far back or forwards from the current date try
changing your pc clock to about the date of interest
and then start the program.
For calendar mode , in the 1970s and pc latches up.
Set back the pc clock to 1980 or whatever is earliest, select clock display mode ,
then calendar , then set 12 months start date in the relevant box
Zoom 286A modem
random flashing LEDs then nothing
Was powered up from 9V ac , not 9V dc.
Replaced the 7805 regulator, beware multilayer board
ing although not saying so. To view them , you have to remove the picture file name
from the picture URL and put this .htm file name in its place
and scroll down to the relevant pic.
Diverse Devices,Southampton,England
Telephone number - the same number as it has been since 1988
but email is now the preferred method of contact so number deliberately not placed here.
I devote time each day to replying to emails.
(obscure/obsolete components,second hand test equipment,
schematics etc)
Postal: 66 Ivy Rd,St Denys,Southampton,England SO17 2JN
There is no point in contacting me about any of the above, the
repair job may have been done 15 years ago .
I cannot clarify or enlarge on any of the above.
A reserve email account is diverse9(commercial at)fastmail.fm.
Please make emails plain text only , no more than 5KByte or 500 words.
Anyone sending larger texts or attachments such as digital signatures, pictures etc will have
them automatically deleted on the server. I will be totally unaware of this - sorry, again
blame the spammers.
More hints & tips and repair briefs on
homepage http://home.graffiti.net/diverse:graffiti.net/
