Troubleshooting
2-67
Test 309.5 – Amps; 200mA range
Pass/Fail
Cannot measure (0.475V + Test 309.4) ±0.0475V at A/D.
The 9.2mA ohms source is switched through U323 (/ACAL pulled low), Q309 and
Q307 (/200mA = +15v), R592 and R591 to common. Op Amp U322 is conÞgured for
x50 gain. Measure approximately 475mV at A/D IN (9.2mA
×
1.01
Ω
×
50) + (zero ref-
erence reading from test 309.4).
Q309, Q307, R592 and R591.
DC_STB
Registers
R1_STB
Registers
R2_STB
Registers
U801
Q1:
0
Q2:
1
Q3:
1
Q4:
1
Q5:
1
Q6:
0
Q7:
0
Q8:
0
U307
Q1:
0
Q2:
0
Q3:
0
Q4:
1
Q5:
1
Q6:
0
Q7:
1
Q8:
1
U505
Q1:
0
Q2:
0
Q3:
1
Q4:
0
Q5:
0
Q6:
0
Q7:
0
Q8:
0
U800
Q1:
1
Q2:
1
Q3:
0
Q4:
0
Q5:
0
Q6:
0
Q7:
1
Q8:
1
U305
Q1:
1
Q2:
0
Q3:
1
Q4:
0
Q5:
0
Q6:
0
Q7:
1
Q8:
1
U500
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
1
Q7:
1
Q8:
1
U300
Q1:
1
Q2:
1
Q3:
1
Q4:
1
Q5:
1
Q6:
1
Q7:
1
Q8:
0
U302
Q1:
1
Q2:
0
Q3:
1
Q4:
1
Q5:
1
Q6:
0
Q7:
1
Q8:
0
U530
Q1:
0
Q2:
0
Q3:
0
Q4:
0
Q5:
0
Q6:
0
Q7:
0
Q8:
1
U303
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
0
Q7:
X
Q8:
X
U501
Q1:
1
Q2:
1
Q3:
0
Q4:
1
Q5:
1
Q6:
1
Q7:
X
Q8:
X
Note: Tables 2-10 through 2-12 provide functional descriptions of the register bits.
Type
Failure analysis
Description
High suspect
components
Bit pattern
Содержание 2001
Страница 1: ...Model 2001 Multimeter Repair Manual Contains Servicing Information...
Страница 129: ...Troubleshooting 2 116...
Страница 139: ...Replaceable Parts 4 4...
Страница 149: ...Replaceable Parts 4 14...
Страница 153: ...Replaceable Parts 4 18...
Страница 156: ...A Model 2001 Specifications A 1...
