# Tektronix 2465

S

#### satelitko

Jan 1, 1970
0
Is there anyone who have a service manula for this oscilloscope? I bought
used one, but found that an IC on fan motor board is missing - so fan
doesnt work at all.
Regards, Gregor

J

#### James F. Mayer

Jan 1, 1970
0
satelitko said:
Is there anyone who have a service manula for this oscilloscope? I bought
used one, but found that an IC on fan motor board is missing - so fan
doesnt work at all.
Regards, Gregor
\

Ebay has some on CD.

J

#### James Sweet

Jan 1, 1970
0
satelitko said:
Is there anyone who have a service manula for this oscilloscope? I bought
used one, but found that an IC on fan motor board is missing - so fan
doesn`t work at all.
Regards, Gregor

Might be quicker to just ask what that IC is, I wonder if that's the only
problem though, seems odd someone would harvest that IC from a working
scope.

J

#### Jim Yanik

Jan 1, 1970
0
pment.com...

Might be quicker to just ask what that IC is, I wonder if that's the
only problem though, seems odd someone would harvest that IC from a
working scope.

ISTR that it was a 5-transistor array.
IIRC,the same chip was used in 400 series scope fan circuits(465?,485),they
both used the same Hall-effect fan motor.Also in some 7000 series
mainframes(78xx79xx,IIRC).

In later 2445/65 series scopes,that fan assy was replaced by a simple 12v
fan like used in PC power supplies.The rear chassis panel was modified to
accept the new fan. I would probably mod that 2465 myself if the fan was
bad,rather than try to find a IC and find the motor was bad,or do without a

T

#### tekman

Jan 1, 1970
0
Jim said:
ISTR that it was a 5-transistor array.
IIRC,the same chip was used in 400 series scope fan circuits(465?,485),they
both used the same Hall-effect fan motor.Also in some 7000 series
mainframes(78xx79xx,IIRC).

In later 2445/65 series scopes,that fan assy was replaced by a simple 12v
fan like used in PC power supplies.The rear chassis panel was modified to
accept the new fan. I would probably mod that 2465 myself if the fan was
bad,rather than try to find a IC and find the motor was bad,or do without a

--

It is as Jim said a 5 transistor array. A CA3046 or 3086 should work
well.

The letter series scopes ("A" or "B") have the PC style fan.

The non letter 24xx scopes have the Siemens Hall effect controlled
motor.
Same as 465/466/465B/475 and 7844/7834/7904A etc. The 7904 has no fan,
so it's really an ease for long hours work (less noise ,-) )

If you want to modify a 245/2465 for the PC style fan: Go and find a
different rear plastic; e.g. from a junker A or B model.
By not replacing the fan you will fry your hybrids sooner or later
(especialy the U800 IC for horizontal drive). Which means your scope
will be completely dead. Do NOT risk this.

hth,
Andreas

J

#### Jim Yanik

Jan 1, 1970
0
It is as Jim said a 5 transistor array. A CA3046 or 3086 should work
well.

The letter series scopes ("A" or "B") have the PC style fan.

The non letter 24xx scopes have the Siemens Hall effect controlled
motor.
Same as 465/466/465B/475 and 7844/7834/7904A etc. The 7904 has no fan,
so it's really an ease for long hours work (less noise ,-) )

Thanks for the clarification!
If you want to modify a 2445/2465 for the PC style fan: Go and find a
different rear plastic; e.g. from a junker A or B model.

It's not just the rear plastic cover,the rear metal chassis plate must be
changed or altered;there are several holes for the PC fan's airflow instead
of the single large hole for the H-E fan's impeller,and I believe the PC
style rear plate has a depression for the PC style fan.

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