As an aid in troubleshooting, critical dc voltages for proper operation are indicated at several
nodes on the accompanying schematic.
If the resolution bandwidths from 3
to 3 MHz have low gain or incorrect bandwidth,
either this board or the
Bandwidth Filter board may be defective. To determine which
board is faulty, disconnect the 97 cable from
and connect it to
If the signal
is then 3 to 5 lower than expected (CAL OUTPUT is -13 to -15
or the bandwidth
is 30 to 60 percent wider than expected
is 1.3 to 1.5 MHz), then
is
suspect.
Control line BW5 determines whether the LC filters or the crystal
are selected. If this
line does not switch,
on the IF control board should be checked. BW63 controls the
crystal mode resolution bandwidths from 3
to 30
The LC resolution bandwidths
from 100
to 3 MHz are controlled by BW7. If any of the control line voltages in Note 5 of
the schematic diagram are incorrect, signals from
IF Control should be checked.
Operation of the
and
circuitry can be determined by the following method.
Connect a 355D attenuator between the CAL OUTPUT and the input of the spectrum
analyzer. Set this attenuator to 90 db, press Instrument Preset, and key in the following:
equal to the CAL OUTPUT frequency
. . . . . . . . . . . . . . . .O Hz
. . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 10 Hz
. . . . . . . . . . . . . . . . 20 s
. . . . . . . . . . -10
Press the
sweep key and then repeatedly press the DATA STEP
key. Figure 8
shows the display of a properly working instrument. If either of the first two steps is missing,
the
or
circuitry is faulty. Note 6 on the schematic diagram indicates the
correct control line voltages from the
IF Control board.
6
Содержание 85662A
Страница 13: ......
Страница 14: ......
Страница 17: ...can cause the CRT to be disabled If U14 is operating correctly visually inspect the A4A9 assembly Al 3 ...
Страница 18: ......
Страница 27: ......
Страница 28: ...AlA KEYBOARD Al Front Panel Assembly and Component Locations ...
Страница 30: ......
Страница 49: ......
Страница 51: ...3 AlA XYZ Driver Amplifier Component Locations 85662 60236 ...
Страница 52: ......
Страница 53: ......
Страница 54: ......
Страница 72: ......
Страница 73: ......
Страница 77: ......
Страница 78: ......
Страница 84: ......
Страница 92: ...V I E W A AlA lII1 0 O0 4 JII fi V I E W B Figure 1 IF Display Section internal Fuse Replacement 8 Al A6 Al A7 ...
Страница 108: ......
Страница 109: ......
Страница 111: ...I 1 AlA f15 V Regulator Component Locations 85662 60232 85662 60250 ...
Страница 113: ......
Страница 114: ......
Страница 115: ......
Страница 122: ......
Страница 124: ...DSl M A I N S I N D I C A T O R C6 CATHODE 4 1 El r l CR9 P I AlA Rectifier Component Locations 85662 60204 ...
Страница 125: ...c 4 C 6 R 6 I 0 C R 9 0 CR10 AlA Rectifier Component Locations 85662 60234 ...
Страница 126: ...0 El E2 r r L J L J _ I 0 0 0 0 AlA Bus Transition Component Locations 85662 60056 ...
Страница 127: ......
Страница 128: ......
Страница 129: ......
Страница 131: ......
Страница 133: ......
Страница 142: ......
Страница 161: ......
Страница 163: ......
Страница 178: ......
Страница 179: ... R51 Y S H BAL R50 X S H BAL R12 LL THRESH A3A2 Intensity Control Component Locations 85662 60025 85662 60245 ...
Страница 180: ......
Страница 181: ......
Страница 195: ......
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 ...
Страница 198: ......
Страница 203: ......
Страница 205: ......
Страница 210: ......
Страница 212: ......
Страница 216: ...Verify binary count sequence starting at the least significant bit SO 500 ns square wave to S7 64 ps square wave 4 A3A6 ...
Страница 219: ......
Страница 221: ......
Страница 226: ......
Страница 228: ......
Страница 241: ......
Страница 256: ......
Страница 258: ...R 5 7 T H G A I N R59 T H O F S A3A9 Track and Hold Component Locations 85662 60165 ...
Страница 259: ......
Страница 260: ......
Страница 262: ...ASXAlPI I A3XA2P 1 AJXAJP 1 A3XA4P 1 A3XA5P 1 A3XA6Pl A3XA7P 1 A3XA9P 1 AJXAlP2 A3XA2P2 A3XASP2 A3XA6P2 A3XA7P2 ...
Страница 263: ......
Страница 266: ......
Страница 274: ......
Страница 275: ...R2 LG OS p 10 C6 I I R14 ar OS 1 5 1 A4Al Video Processor Component Locations 85662 60122 ...
Страница 276: ......
Страница 293: ......
Страница 294: ...2 k 4 5 7 J2 F1 TEN R91 12VTV R14 LG 20 A4A2 Log Amplifier Detector Component Locations 85662 60132 ...
Страница 295: ...2 4 5 1 0 N a R79 ZERO 4 E N TV R14 LG 20 A4A2 Log Amplifier Detector Component Locations 85662 60166 ...
Страница 296: ......
Страница 297: ......
Страница 315: ......
Страница 316: ...10 A 1 2V T Y P 7 V T Y P A4A3 Log Amplifier Filter Component Locations 85662 60009 ...
Страница 318: ......
Страница 319: ......
Страница 321: ... 15v t15v cl7 ETC Figure 2 A4A4 Input Buffer Amplifier Current Sinks 2 A4A4 ...
Страница 334: ......
Страница 336: ...c 4 3 L C D I P c41 L C D I P A4A4 Bandwidth Filter Component Locations 85662 60189 TR ...
Страница 337: ......
Страница 338: ......
Страница 352: ......
Страница 354: ......
Страница 363: ......
Страница 365: ...A4A8A2 Down Converter Component Locations 85662 60005 ...
Страница 366: ...c31 R29 1 8 4 M H z NULL W I D E G A I N A4A6Al Up Converter Component Locations 85662 60006 ...
Страница 367: ......
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 ...
Страница 380: ......
Страница 399: ......
Страница 402: ......
Страница 403: ......
Страница 409: ...Table 4 Video Bandwidth Truth Table 6 A4A9 ...
Страница 428: ......
Страница 429: ......
Страница 430: ......
Страница 434: ......
Страница 447: ......
Страница 452: ...A4A6A2 Output Driver Component Locations 85662 60170 Option 067 Tab ...
Страница 453: ...A4A6Al Input Buffer Component Locations 85662 60171 Option 067 Tab ...
Страница 454: ......
Страница 470: ......
Страница 473: ...Table 4 Video Bandwidth Truth Table Option H96 3 ...
Страница 498: ......
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 ...
Страница 514: ......
Страница 523: ......
Страница 531: ......
Страница 548: ......
Страница 549: ......
Страница 550: ......
Страница 582: ...This page intentionally left blank 32 General Parts Listing ...
Страница 594: ...HEWLETT PACKARD HP Part No 85662 90085 Printed in USA ...