Manual Changes/Model 6269B
Manual HP Part No,
Page
| CHANGE 5: |
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| CHANGE 6: | |||||
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| In the Replaceable Parts list and on the schematic, | |||||||||
The standard colors for this instrument are now | ||||||||||||
make the following changes: | ||||||||||||
mint gray (for front and rear panels) and olive, gray | ||||||||||||
A1R24: Change to 127k Ω, ±25%, 1/8W, HP Part | ||||||||||||
(for all top, bottom, side, and other external sur- | ||||||||||||
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faces). Option X95 designates use of the former |
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A1R25: Change to 90.9k Ω, ±1%, 1/8W, HP Part | ||||||||||||
color scheme of light gray and blue gray. Option | ||||||||||||
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A85 designates use of a light gray front panel with |
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olive gray used for all other external surfaces. | These changes insure that the Short Circuit Protec- | |||||||||||
New part numbers are shown below: |
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| DESCRIPTION |
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| HP PART NO. |
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| STANDARD |
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| OPTION A85 | OPTION X95 |
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| Front Panel, Complete | I |
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| Front Panel, Lettered |
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| Rear Panel |
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| Cover, Top and Bottom |
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| Chassis, Assembly |
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CHANGE 7:
In the replaceable parts table under AI Main P. C. 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.
T70, T90: Change to HP Part No.
The above changes have been made to improve the noise immunity of the overvoltage protection crowbar 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
In order to eliminate false triggering and ripple imbalance in the Preregulator Control Circuit, the following changes have been made:
Diode CR88 and resistor R88 are now in series
CHANGE 8:
with the secondary winding of the new Pulse Generator Pulse Transformer T70 (HP Part No.
In the replaceable parts table under A2 RFI Filter Assembly, change Triac CR1 HP Part No. to 1884- 0218.