HP 6034A User Manual page 69

Table 5-7. Power Mesh/Control Board Bias Voltages
(All bias voltages measured at Control Board test fingers (A2P2) with respect to bias common\2
at pin 12 or at A2U1 heatsink. Table 5-8 lists semiconductor components operating on each bia£
supply.)
Bias
Voltage
Measurement
Point
Normal
Range Check these Components
+- 5 V Reg Pin 21 + 4.75 V to +5.25 V Check for presence of + 5 V Unreg (+ 12 to +19 V,
pin 16). If absent, check A1T5 pins 7 and 9,
A1CR22-23, A1C35, A1R61, A1VR5. If present,
check A2U1.
4 15 V Reg Pin 20 + 14.10 V to 15,90 V
Check for presence of +15 V Unreg ( + 19 V to
+ 31 V, pin 11). If absent, check A1T5 pins 6 and 10,
A1U3, A1C36. if present, check A2Q1, A2U2, A2R2-
R7, A2VR1, A2C3.
- 12 V Reg Pin 24 -12.96 V to -11.4 V
Check for presence of -12 V Unreg (-19 V to
-31 V, pin 8). If absent, check A1C37. if present
check A2Q2, A2U3, A2R8-R11, A2C4.
Table 5-8. Semiconductor Components Operating on Each Power Mesh Bias Supply
+ 5 V REG + 15 V REG -12 V REG
A1U2
A1Q8 ( + 6.5 V) A2U11
A2Q4
A1UH+ 14.5 V)
A2U12
A2Q6
A2Q12 A2U13
A2Q7
A2Q8
A2Q9
A2Q14
A2U4
A2Q13
A2U11
A2U13
A2U14
A2U14
+ 15 V UNREG -12 V UNREG A2U5
A2U6
A2U7
A2U8
A2U2
A2U3
A2U9
A2U10
+ 5 V UNREG — 8 V UNREG
A2U12
A1Q11 A1Q6
A2Q5
A1U5
A2U1
5 23