10, 11, 12 Multimeters
Service Manual
2-4
Table 2-1. Electrical Components on Main PCA
Circuit and Function Component Designator(s)
Analog Measurement IC U1
Microcomputer IC U2
Input Divider and Ohms Reference Resistor Network Z1
Input Divider AC Coupling Capacitor C14
J2 Input Receptable Voltage Sense Resistor R17
J1 Input Receptable Voltage Sense Resistor R14
Reference Voltage for Volts Measurements VR1, R4, R5, R6, R26
A/D Converter Integrate Capacitor C2
A/D Converter Autozero Capacitor C1
A/D Converter Gain Resistors R1, R3, R15
Active Filter Components R7, R8, C5, C6
Passive Filter Components R9, C7
AC to DC Converter Gain Resistors R11, R12, R13
AC to DC Converter AC Coupling Capacitor C8
Bias Current Setting Resistor R2
DGND-VSS Voltage Setting Resistors R10, R24
Power Supply Bypass Capacitors C3, C15
Reverse Battery Protection CR1
System Clock Y1
VCHEK Input Current Limiters R16, R18, R29
VCHEK input Positive Temp. Coef. Thermistor RT1
VCHEK Input Voltage Clamp Circuit Q1, Q2, CR2, R28
VCHEK Input Fusible Resistor R19
Microcomputer Reset Circuit R23, R25, C10, C13, CR3
On/Off and VCHEK Select Slide Switch S1
Beeper LS1
Beeper Current Limiter R22
Slide Switch Protection E1
Switch Sense Bypass Capacitor C9
Input Divider Bypass Capacitor C16
Zero Ohm Jumpers R20, R21, R27
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