User's Manual

1. GENERAL DESCRIPTION
The new refreshed M32 using conventional 17” CRT, it is so-called “Digital Controlled Auto-scan Color
Display Monitor” with high resolution which can operate at horizontal scan frequency from 30KHz up
to 70KHz, and the vertical scan frequencies can operate from 50 to 160 Hz.
The monitors are equipped with an micro-controller, which is adjustable for all modes by OSD control,
The monitors comply with TCO99/MPRII low emission standard and also fulfill E2000 automatic power
saving requirements; to reduce power consumption less than 2 watts in power saving mode, the monitor
also can complies with VESA standard and energy star computer program initiated by the EPA.
2. DESCRIPTION OF CIRCUIT DIAGRAM
This description mainly introduces the functions including power supply, horizontal / vertical deflection,
video amplifier, micro-controller, etc.
A. POWER SUPPLY
The monitor is designed to adopt switching mode power supply which can operate mains input from
90VAC to 264VAC, this switching power supply apply an IC TEA1507controller, that power MOSFET
is packed inside as well. The control scheme transforms a switching converter from a voltage source
into a multi-output voltage, the control concept is exhibited many desirable properties such as inherent
over-load protection, stable and fast system response, the maximum output power capability is up to 90
watts for different models, then a power limiting circuit is added for different power delivery and safety
reason, on main power supply circuit, secondary feedback via a photo-coupler is used to obtain a stable
output voltage, the secondary outputs supply all necessary voltages for deflection and video and rest
except micro-controller.
In order to meet the power consumption less 2 watts @ off mode, introduction the new controller IC
TEA1507, this design has been considered and executed in low and high mains voltage.
All rectified diodes on secondary site are without lead frame ( heat-sink), it gains some cost saving in
thermal design, but the turn ratios of main transformer should be fixed to maintain a adequate voltage
derating of primary switching MOSFET and secondary +190V rectified diode BYV36C (with better
thermal performance), this is trade off design in between, the other hand, a primary DC power switch
which can replace AC power switch is also reserved but symbol on the bezel must be modified for the
approbation reason.
This monitor can save power consumption while no sync pulses and automatically recover to normal
power on when sync signals are detected by micro-controller, the power saving off mode still exist in
new designed monitors but suspend / stand-by mode are deleted due to pattern infringement issue, but
still reserve them for the option and future implementation required.
During Off mode operation, all the output voltages of main power are reduced to zero, only the required
voltage of micro-controller is supplied by second power, then it will be used to restart the main power
while monitor wake-up is required.