Sharp PZ-43HV2 Service Manual page 41

Block diagram for Power supply section
SW POWER SUPPLY MODULE
AC IN
100 - 240V
ST-BY
Power Supply
STB5V
Supplementary information
1. Power on/off switch for the large-signal system (SW102)
Function: Only the power for the small-signal system
(15V, 12V, 6.5V, 13.5V, and -9V) is on, and the
power for the large-signal system (VSUS, VADR)
is off.
Usage: Use when only an operational check for the small-
signal system is required.
Supplementary information:
When this switch is to be used, the wires of pin 5
(DIG, ADR, and PD) of the P2 connector of the
power-supply module should be disconnected to
prevent the PD circuit from operating. To turn the
power of the large-signal system off without using
this switch, operation from an external PC
through RS-232C commands "DRF" is basically
required. In this case, the above procedure is not
required, as the PD circuit is muted by software.
Method of power supply ON in the large signal
system OFF state with RS-232C command
1 Confirm that this unit is the standby state.
2 Transmit RS-232C command "DRF."
3 Turn the power supply ON by remote control unit, side
key or command "PON."
∗ When turn the power supply OFF once, return to
setting of large signal system ON.
When turn the power supply ON in the large signal
system OFF, transmit "DRF" command each time.
2. 200V AC power-down switch (SW101)
Function: While 200V AC voltage is applied,
operation of the PD circuit is turned on and off
(ON when the switch is set to 100V AC, and OFF
when the switch is set to 200V AC).
Setting: For the PU model only, the switch is set to 100V,
and for other models, it is set to 200V.
+B395V
Power Factor VSUS DC/DC
Control Converter
VADR DC/DC
Converter
6.5V DC/DC
Converter
(6.5V, 13.5V, -9V)
15V DC/DC
Converter
(15V, 12V)
Y DRIVE ASSY
VOFS DC/DC
Converter
VSUS
215V
VH DC/DC
Converter
VADR
61V
IC5V, VF12V
DC/DC
Converter
13.5V
X DRIVE ASSY
-9V
VRN DC/DC
Converter
12V
DIGITAL VIDEO ASSY
15V DC/DC
Converter
(5V, 3.3V, 2.5V)
3. Temperature compensation of the VSUS voltage for
the drive system
Function: Control the power supply voltage mentioned
above according to temperature. (Temperature
compensation works so that the voltage is
lowered on the lower-temperature side, and is
raised on the higher-temperature side.)
Purpose: To improve the yield by compensating the
temperature characteristics of the panel.
Supplementary information:
For this model, temperature compensation is
perform-ed only for the VSUS voltage, and not for
the VOFS voltage, and it is controlled by
software.
4. When a fuse blows
• If a fuse blows, never turn the power on again only after
replacing the fuse. (In most cases, the fuse itself did not
have any problem. So as long as factors of overcurrent
have not been removed, chances of destruction increase
every time the power is turned on. In the worst case,
about a dozen parts may be destroyed.)
• Principally, the whole power-supply module must be
replaced.
5. Voltage adjustment of the panel drive
As this model employs the electronic VR system for the
VSUS and VOFS voltages, and as the voltage-adjustment
data are stored in the DIGITAL assembly, voltage
adjustment of the panel drive is not necessary when the
power-supply modules are changed. (For VADR, VH, and
VRN, adjustments with semifixed VR controls are
necessary.)
For this model, as the power-supply block has been
developed and designed by an outside vendor, at the point
you know which module is a cause of failure (through
diagnosis described elsewhere in this manual), change the
corresponding modules, and do not diagnose or repair the
module.
Similarly, the switches and the semifixed VRs inside the
power-supply module must not be adjusted without a
special reason.
41
PZ-43HV2, PZ-43HV2E
PZ-43HV2U
VOFS
-45V
VH
130V
IC5V
VF12V
VRN
-280V
5.0V
3.3V
2.5V