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Table 8-1
GENERAL PROBLEMS
Table 8-2
COUNTER INTEGRITY ERRORS
PROBLEM
MEASUREMENTS ARE STABLE BUT NOT ACCURATE.
ERROR CODE
SUSPECT CIRCUITRY
SUSPECT CIRCUITRY
I .
CHECK THAT INPUT SIGNAL I S WITHIN TRIGGER LEVEL RANGE) O R NO INPUT.
2.
MAKE SURE ARM INPUT I S HIGH.
@
3.
CHECK +12V) -12V)-5V.
4.
SUSPECT FET Q1410, CHECK FOR SIGNAL ON T I 4 1 8
TIME BASE OSCILLATOR ( + I 8V SUPPLY FOR OPT. 1 1
.
BUFFER
-
Q1500) DIVIDER
-
U1411) AND PHASE
LOCKED LOOP COMPONENTS O R JUMPERS 51511
O R 51515 LOOSE.
5.
CHECK MR AND
~ i i i
LINES.
@
6 .
CHECK CH A DAC.
7.
CHECK CH A AMP.
8 .
CHECK GATING.
9.
CHECK INPUT TO ACCUMULATOR.
@
10. SUSPECT U1000A.
11. SUSPECT U11028, U1121.
DUAL DMOS I N AMPLIFIER
@
,+12V) -12V) -5V)
+5V
SUPPLIES
@
)
AMPLIFIER COMPONENTS
DOES NOT TRIGGER PROPERLY (MAY BE INDICATED
BY INCORRECT SHAPED OUTPUTS).
SWITCH
@
@,RELAYS
@
,
RELAY DRIVERS
U1520E
@
INPUT CONDITIONING DOES NOT FUNCTION PROPERLY,
1,
SUSPECT U1000A) U l 0 l l
2.
SUSPECT U1710D) U1121
OISPLAY CIRCUITRY
@ @
OISPLAY DOES NOT FUNCTION PROPERLY.
AUTO TRIGGER DOES NOT FUNCTION PROPERLY.
1.
SUSPECT U l 0 l l A
3
0
2.
CHECK CABLE W528
*2-5V SUPPLY
8
5
D/A CONVERTERS
-
U1210)
0
U l 3 1 8
@
,
SERI AL-TO-PARALLEL
SHI FT REG I STERS
-
U12222) U1220) U1221
,INPUT AMPLIFIERS
BUFFERS
-
U1200
3.
SUSPECT U1810A
4
0
4.
SUSPECT U1710B) U1121
@
1
LEVEL SHIFTER 41702) Q1701
=SIGNAL@)@
SUSPECT U1102C) U1410 @,SCHMITT
TRIGGERS
)
AMPLIFIERS
0
)
0.
MEASUREMENTS WITH LOW FREQUENCY INPUT
SIGNAL ARE NOT STABLE.
-
1
.
SUSPECT LEVEL SH I FTER Q 1 7 0 2
Q l 7 0 l
' I
2.
SUSPECT U 1 1 28A
3 .
SUSPECT U1121
@
J
GATE LIGHT ALWAYS ON.
NO MEASUREMENT
COMPLETED.
fi
SIGNAL
SUSPECT U1102C) U1410
@.
ARM STUCK LOW
:
Q1510)P1511
@
- -
- - -
- -
1.
SUSPECT CABLE W528 O R ANY ACCUMULATOR CHIP
1.
CHECK CH B DAC
@
2 .
CHECK CH B AMP
1
00
3.
CHECK FET 91430
4.
CHECK FOR SIGNAL ON T I 4 3 0
5 .
CHECK GATING
3
0
6.
CHECK INPUT TO ACCUMULATOR
@
7.
SUSPECT U1011C
@
8.
SUSPECT U1102A O R "1122
6
- - -
- - - -
1.
SUSPECT U1011C) Ul011B
2.
SUSPECT U1710C) U1122
4
0
1
.
SUSPECT U1011
)
O R CABLE US38
3
2.
SUSPECT U1810B
6
0
3.
SUSPECT U1103 4
0
1.
SUSPECT U1810B) LEVEL SHIFTER Q1704, 91703
2.
SUSPECT U1122
4
0
1,
SUSPECT LEVEL SHIFTER a17043 91703
2.
SUSPECT U1120B) U1122
1.
SUSPECT CABLE W529 O R ANY ACCUMULATOR CHIP
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