HP 562A Operating Instructions Manual page 44

r!jJ
MANUAL CHANGES
MODEL 562A
DIGITAL RECORDER
Serials Prefixed: 134-
Manual Printed: 9/61
The following changes adapt this manual to instruments having the serial prefixes listed below:
(Ch.
=If
=
Change Number; Sere Pre.
=
Serial Prefix)
Ch.
=If
Ser. Pre. New Data
.1
,.
1
2
3
4
134-
134-
134-
134-
On the Column Board schematics,
The scan signal should be a negative going 25 volt signal.
Resistors RI06, 109, 115, 118, 129, 132, 138, and 141 have been changed to 4.7K.
Change R142 to 22 ohms.
On the Control Board, (Figure 5-5)
R221 should read 68 oluns.
R222 should read 68 oluns.
R279 should read 560 ohms.
Resistor R287 should return to the reset line instead of the + 17 volt line.
On the Wiring and Power Supply diagram (Figure 5-3),
Delete Fuse Fl. Fuse Fl should
be
in the line coming from the upper half
of
the AC
power plug.
P301 and 302 should have the reference voltages applied to pins 1 and 2 instead of pins
3 and 4.
R303 should
be
changed to 100 ohms.
On the Analog Circuitry schematic (Figure 5-6),
C406: Capacitor, 0.05
uf,
should be added from the junction of R433-434 to ground.
Change C406 to C407.
The 2. 4V breakdown diode should have the reference designator CR422.
J501: The wires from pins 17 and 18 should be reversed.
Change R40 to R409.
Change R49 to R439.
R349 should
be
changed to 1. 8K.
R434 should
be
changed to 2. 5K.
R442 should
be
changed to 6.8K.
R446: Resistor, 470 ohms, should be added from -9 V to ground on the analog board.
Change R415 to R415A and R416 to R415B.
Total resistance of both resistors is factory adjusted to 303K.
Change R417 to R417A and R418 to R417B.
Total resistance
of
both resistors is factory adjusted to 606K.
Change R419 to R419A and R420 to R419B.
Total resistance of both resistors is factory adjusted to 606K.
Change R425 to R425A and R426 to R425B.
Total resistance of both resistors is factory adjusted to 1.212 megoluns.
On all sections of S5,
Change pin 15 to 12, 14 to
!.t
13 to !1, and 12 to 15.
11/8/61