Hardware Overview
Theory of Operation
1 - 4
0070-10-0591-01
Trio™ Service Manual
FIGURE 1-3
Block diagram of
Trio
power supply board
Key Test Points
NO. NAME
LOCATION
FUNCTION
1
Rectified voltage
C12
Primary rectified voltage, range: 107~354 V
2
RTN1
C12 negative
electrode
Primary ground
3
Driving
waveform
Q1.1
There is a driving waveform of about 100 KHZ
between Q1.1 and the negative electrode of C12
4
VIN
C19 positive
electrode
17.5 V provide input voltage for DC-DC
5
GND
C19 negative
electrode
Secondary ground
6
5B
C47 positive
electrode
5 V spare output, provide power for on/off circuit
7
5 V
ZD3 cathode
5 V output, voltage range is 4.75~5.25 V
8
12 V
ZD3 cathode
12 V output, voltage range is 11.0~13.0 V
AC
input
AC/DC
12V output
REC POWER
SOURCE
Power on/off
control circuit
5VDC-DC
converter
Voltage
test
Battery
and
Charging
Management
Circuit
