AppendixC
~MANUAL
BACKDATING
CHANGES
Model209A
Sine/Square Oscillator
Manual Serial Prefixed: 818-
This manual backdating sheet makes this manual applicable to earlier instruments.
Instrument-eomponent values that differ from those in the manual, yet are not listed in
the backdating sheet, should be replaced using the part number
given
in
the manual.
Model209A
I
nstrument
Serial
Prefix
Make
Manual Changes I
nstrument
Serial
Prefix
Make
Manual Changes
818-00800 and below No.1
818-00950 and below
No.l,2
818-01876 and below
No.1,
2, 3
CHANGE NO.1 (818-00800 and below)
Table 6-1: Delete
Al
C30*.
Figure
7-1
: Delete AlC30*.
CHANGE
NO.2
(818-00950 and below)
Table
6-1
:
Change AICR6 to "Diode: silicon" -hp- Part No. "1902-0041.
Change Al R43 to "R: fxd,
18
kilohms"
-hp-
Part No. 0684-1831.
Figure 7-1:
Show AlCR6
as
a conventional diode.
Change the value
of
Al R43 to
18
kilohms.
NOTE (818-01776 and below)
Replacement
of
AlCR12
Tunnel diode (-hp- Part No. 1912-0009)
is
the replacement part for -hp-
Part No. 1912-0026. The ANODE and CATHODE connections
of
the new
diode are reversed with respect to the discontinued diode (see below
figure).
ANODE--Q:J--
CATHODE
ANODE--[]--
CATHODE
.....
4_----DOT
PC
BOARD---
.............
NEW
DIODE
(-hp- Part No. 1912-0009)
Case
Marked IN3712GE
DISCONTINUED DIODE
(-hp- Part No. 1912-0026)
Case
Marked TD712GE
The replacement diode should be placed in the circuit with the case
(CATHODE) away from the dot on the Al printed circuit board.
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