If the BW5 control line is not switching, Q3 is most likely defective. If Q3 is found to be
defective, check to determine if it has failed also.
Figure 1 is reproduced from the troubleshooting for the
Step Gain. It shows the
results of a quick test to determine proper operation of the 0.0 to 1.9 attenuator section
of the
to A15.9 control. As the figure shows, the steps are not exactly 0.1
If the
steps are not continuously increasing (monotonic), either a control line is not switching or
a switching diode is defective. Table 6 will be useful in determining when a control line is
active.
REF
LINEAR
CENTER
- 9 . 9
1 0
M K R
1 9 . 3 6
1 . 9 0
1 0 0 . 0 0 0 M H z
SPAN 0 Hz
RES BW 3 MHz (1)
VBW 3
2 0
Note
Center Frequency readout will be 20.000 000 MHz for an
HP
85678.
Figure 1. 0.1
Step Gain Display
The absolute step amplitudes can be determined with the MARKER A function. The
reference steps are 0.0 and 0.9
In the Linear mode the error should be less than
The 1
1.4
and 1.8 steps are controlled by factory selected resistors. If one of these
steps is in error by more than 0.12 in the Linear mode, refer to the adjustment section
of the Performance Tests and Adjustments Manual for the procedure to determine the correct
value. The other steps should be f0.2 in the Linear mode.
3
Содержание 85662A
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Страница 17: ...can cause the CRT to be disabled If U14 is operating correctly visually inspect the A4A9 assembly Al 3 ...
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Страница 28: ...AlA KEYBOARD Al Front Panel Assembly and Component Locations ...
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Страница 196: ...R 8 YSL L Il ln R IC7n XSL 0 0 0 R 5 I I Y G A I N R 2 Y E X P A3A3 Line Generator Component Locations 85662 60128 ...
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Страница 262: ...ASXAlPI I A3XA2P 1 AJXAJP 1 A3XA4P 1 A3XA5P 1 A3XA6Pl A3XA7P 1 A3XA9P 1 AJXAlP2 A3XA2P2 A3XASP2 A3XA6P2 A3XA7P2 ...
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Страница 275: ...R2 LG OS p 10 C6 I I R14 ar OS 1 5 1 A4Al Video Processor Component Locations 85662 60122 ...
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Страница 294: ...2 k 4 5 7 J2 F1 TEN R91 12VTV R14 LG 20 A4A2 Log Amplifier Detector Component Locations 85662 60132 ...
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Страница 316: ...10 A 1 2V T Y P 7 V T Y P A4A3 Log Amplifier Filter Component Locations 85662 60009 ...
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Страница 365: ...A4A8A2 Down Converter Component Locations 85662 60005 ...
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Страница 379: ...c40 c 4 1 PK SYM y Hz A M P L 10 Hz AMPL A4A7 3 MHz Bandwidth Filter Component Locations 85662 60004 85662 60174 ...
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Страница 409: ...Table 4 Video Bandwidth Truth Table 6 A4A9 ...
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Страница 452: ...A4A6A2 Output Driver Component Locations 85662 60170 Option 067 Tab ...
Страница 453: ...A4A6Al Input Buffer Component Locations 85662 60171 Option 067 Tab ...
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Страница 473: ...Table 4 Video Bandwidth Truth Table Option H96 3 ...
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Страница 504: ...Table 4 Video Bandwidth Truth Table 100 Hz H 30 Hz H H 10 Hz H 3 Hz H 1 Hz 6 Option 462 ...
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Страница 594: ...HEWLETT PACKARD HP Part No 85662 90085 Printed in USA ...