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Manual Changes/Model 6269B
Manual HP Part No, 06269-90002
Page -2-
CHANGE 5:
The standard colors for this instrument are now
mint gray (for front and rear panels) and olive, gray
(for all top, bottom, side, and other external sur-
faces).
Option X95 designates use of the former
color scheme of light gray and blue gray. Option
A85 designates use of a light gray front panel with
olive gray used for all other external surfaces.
CHANGE 6:
In the Replaceable Parts list and on the schematic,
make the following changes:
A1R24: Change to 127k
Ω, ±25%, 1/8W, HP Part
No. 0698-6659.
A1R25: Change to 90.9k
Ω, ±1%, 1/8W, HP Part
No. 0757-0464.
These changes insure that the Short Circuit Protec-
New part numbers are shown below:
tion circuit operates correctly.
HP PART NO.
DESCRIPTION
STANDARD
OPTION A85
OPTION X95
Front Panel, Complete
I
06269-60005
Front Panel, Lettered
06269-60009
Rear Panel 5000-9475
Cover, Top and Bottom
5000-9476
Chassis, Assembly
(weIded)
5060-7972
06269-60006
5000-6247
5000-6250
5060-6186
CHANGE 7:
with the secondary winding of the new Pulse
Generator Pulse Transformer T70 (HP Part No.
In the replaceable parts table under AI Main P. C.
5080-7192) as shown below:
Board - Electrical and on the schematic (in the
Overvoltage Protection Crowbar circuit), make the
following changes:
C91: Add, 0.0047µF, 200V, HP Part No. 0160-
0157.
R99: Change to 10k Ω, ±5%, ½W, HP Part No.
0686-1035.
T70, T90: Change to HP Part No. 5080-7192.
The above changes have been made to improve the
noise immunity of the overvoltage protection crow-
bar and thereby eliminate spurious triggering of the
crowbar.
Capacitor C91 is connected from between
the collector of Q92 (which also connects to the
base of Q91) and
The top of R99 has been
disconnected fmm +12.4V and connected instead to
the junction of R94-R95 (the other end of R95 still
connects to the base of Q92 through CR91).
In order to eliminate false triggering and ripple im-
balance in the Preregulator Control Circuit, the
following changes have been made:
Diode CR88 and resistor R88 are now in series
CHANGE 8:
In the replaceable parts table under A2 RFI Filter
Assembly, change Triac CR1 HP Part No. to 1884-
0218.