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3. Checking the Electronic Board
The DBS boards and their signal allocations are summarized below. Numbers in parentheses ((1), (2), (3),
and so on) indicate pin numbers, and a checkmark
3.1
Main Board Assembly (B2)
ASSY P/N
Board P/N
Circuits Mounted
3.2
Analog Board Assembly (B3)
ASSY P/N
Board P/N
Circuits Mounted
Voltage for Checking
(when connected to
detector assy)
38
321-71373-41 (same for all models)
321-71372
CPU (calculates measurement data and controls key switches)
Dedicated LCD driver IC chip
EEPROM with connector J3 for writing with Flash Writer
Main clock (20 MHz), used to form a +5 V logic system
Dedicated calendar IC chip
321-64556-14 (same for all models)
321-64558
Mechanical sensor PID control (feedback) circuit
Measurement system (A/D converter) circuit and reference power supply
generator circuit
Magnet temperature correction and measurement circuits
TPG
Signal ground (0 V)
TP1
During pre-amp control signal output feedback: 0 V
TP2
Coil current control voltage
TP3
Voltage on output resistance end (about 0.6 to 2.3 V)
J2 (1)
Beam sensor LED positive potential about -5.2 V
J2 (2)
Beam sensor LED negative potential about -6.8 V
J2 (3)
Magnet temperature sensor output voltage about 0.6 V
J2 (4)
Signal ground (0 V)
J2 (5)
During beam sensor photodiode output feedback: 0 V
J2 (6)
Signal ground (0 V)
J2 (7)
During beam sensor photodiode output feedback: 0 V
J1 (1)
Signal ground (0 V)
J1 (2)
Power supply for analog system: about -12 V
J1 (3)
Power supply for analog system: about +12 V
J1 (4)
Temperature A/D digital signal
J1 (5)
Temperature A/D digital signal
J1 (6)
Weight A/D digital signal
J1 (7)
Weight A/D digital signal
J1 (8)
Weight A/D digital signal
J1 (9)
Weight A/D digital signal
(
) indicates a point that should be checked, if possible.
DBS-SH-e-1210
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Troubleshooting
