Service manual

PT300, Service Manual
Rev B, October, 2000
4
Table of Illustrations
FIGURE 1 BLOCK DIAGRAM.................................................................................................8
FIGURE 2 BATTERY CHARGER ............................................................................................9
FIGURE 3 SWITCH............................................................................................................10
FIGURE 4 INTEGRATOR/COMPARITOR................................................................................12
FIGURE 5 CONVERSION CYCLE.........................................................................................13
FIGURE 6 LCD DRIVE ......................................................................................................15
FIGURE 7 BLANK EEPROM TEST WAVEFORMS ................................................................20
FIGURE 8 BLANK EEPROM TEST, ADDRESS LINES...........................................................21
FIGURE 9 TEST WAVEFORMS ...........................................................................................22
FIGURE 10 SIO MASTER TEST .........................................................................................24
FIGURE 11 SIO SLAVE TEST............................................................................................25
FIGURE 12 LOAD CELL SCHEMATIC...................................................................................26
FIGURE 13 LOAD CELL PLACEMENT ..................................................................................32
FIGURE 14 SUMMING BOARD............................................................................................40