E
Erik Baigar
- Jan 1, 1970
- 0
Hi together,
two months ago the floppy disk drive of my HP/Agilent 1661A analyer
stopped working: One always gets CRC ERROR or BAD DISK. This makes
the analyzer rather unusable since it is not real fun to reenter
the labels etc on each usage...
So I tried to fix it: The floppy disk drive is of type EPSON
SMD1000, Serial N1405001, SupType SMD1040-018, C30601. I got
four SMD1000 drives via eBay and I had to notice that there
exist many different versions of them:
Most originate from laptops and have a 26 pin flexible connection
for shugart bus and power. The drive from the analyzer has the
PC standard pinheader with 34pins but also contains power on
this pinheader. The standard pinouts are readily available on
the WWW and I figured out how power is passed to the SMD1000 in
case of the HP1661A analyzer (7, 9, 11: +5V, NOT GND as usual ->
short circuit if normal PC drive is connected). So I tried another
EPSON SMD1000 haveing the pinheader first. Result: Does not work,
too!
So I suspected the FDC beeing the problem and I changed the WD37C65C
and verified the crystals etc. for proper operation. This did
not improve the situation. A new cable did not change anything
either. So ???
Recently I noticed that additionally to the jumpers on the
drives (which I set properly, of course) there is a short
piece of flexible PCB which is used as a 7-flod jumper
within the drive. But these PCBs are different in the
drives. Within the 5 drives I have, there are tree different
PCBs (Type A (2-3 and 5-11), Type B (2-3, 4-14 and 7-8-11)
and Type L from the analyzer (3-13, 4-12 and 5-9-11)).
They change some internal connections and deliver signals
to undocumented pins of the pinheader, too.
Now my questions are: (1) Has anyone out there experience with
changing the floppy on the HP1660 analyzer series?
(2) Does there exist documentation on the EPSON SMD1000 drive
describing the meaning of the flexible PCB? I already
contacted Epson without success. No, moving the flexible
PCB to one of the other drives does not fix the problem.
(3) Has anyone got documentation about the HP1660 analyzer
series telling someting about the floppies?
(4) I could build a adapter cable to connect one of the
drives needing the flexible notebook connection to the
analyzer but I suspect it does not make things better?
(5) Connecting a PC-drive with seperate power (and of
course disconnecting the analyzers power pins) always
leads to error "TIMEOUT" independent of drive select
jumpering. So I suspect that some kind of ready or
disk inserted signal is missing - maybe this is related
to the undocumented signals mentioned above?
Any hints are welcome,
Erik.
two months ago the floppy disk drive of my HP/Agilent 1661A analyer
stopped working: One always gets CRC ERROR or BAD DISK. This makes
the analyzer rather unusable since it is not real fun to reenter
the labels etc on each usage...
So I tried to fix it: The floppy disk drive is of type EPSON
SMD1000, Serial N1405001, SupType SMD1040-018, C30601. I got
four SMD1000 drives via eBay and I had to notice that there
exist many different versions of them:
Most originate from laptops and have a 26 pin flexible connection
for shugart bus and power. The drive from the analyzer has the
PC standard pinheader with 34pins but also contains power on
this pinheader. The standard pinouts are readily available on
the WWW and I figured out how power is passed to the SMD1000 in
case of the HP1661A analyzer (7, 9, 11: +5V, NOT GND as usual ->
short circuit if normal PC drive is connected). So I tried another
EPSON SMD1000 haveing the pinheader first. Result: Does not work,
too!
So I suspected the FDC beeing the problem and I changed the WD37C65C
and verified the crystals etc. for proper operation. This did
not improve the situation. A new cable did not change anything
either. So ???
Recently I noticed that additionally to the jumpers on the
drives (which I set properly, of course) there is a short
piece of flexible PCB which is used as a 7-flod jumper
within the drive. But these PCBs are different in the
drives. Within the 5 drives I have, there are tree different
PCBs (Type A (2-3 and 5-11), Type B (2-3, 4-14 and 7-8-11)
and Type L from the analyzer (3-13, 4-12 and 5-9-11)).
They change some internal connections and deliver signals
to undocumented pins of the pinheader, too.
Now my questions are: (1) Has anyone out there experience with
changing the floppy on the HP1660 analyzer series?
(2) Does there exist documentation on the EPSON SMD1000 drive
describing the meaning of the flexible PCB? I already
contacted Epson without success. No, moving the flexible
PCB to one of the other drives does not fix the problem.
(3) Has anyone got documentation about the HP1660 analyzer
series telling someting about the floppies?
(4) I could build a adapter cable to connect one of the
drives needing the flexible notebook connection to the
analyzer but I suspect it does not make things better?
(5) Connecting a PC-drive with seperate power (and of
course disconnecting the analyzers power pins) always
leads to error "TIMEOUT" independent of drive select
jumpering. So I suspect that some kind of ready or
disk inserted signal is missing - maybe this is related
to the undocumented signals mentioned above?
Any hints are welcome,
Erik.
