1, Panasonic (Matsushita) method to zero out of the projector.
Panasonic projector clear way: press "MENU" to find light bulbs to use, then press "ENTER" three seconds, there "POWER OFF" after the power switch to restart the OK! . .
2. Hitachi (Hitachi) projector zeroing..
Hitachi projector clear method: boot, press the RESET Kin 3 seconds, the time the dialogue appears, select 0 on OK. .
3. SONY (Sony) projector zeroing..
Sony's Clear method: RESES + L + R + OK (for most Sony models). .
4, Toshiba (Toshiba) projector zeroing..
Toshiba projector clear: the rejection of power supply, press the power + menu + OK + Enter, then press and hold power for 3 seconds, for 780 all previous machines. .
5. Philips (Philips) zero: projector.
Philips projector clear method: boot, the menu bar lamp time, press the OK button on the projector for 3 seconds. .
6, SANYO (Sanyo), EIKI (love it), Canon (Canon) zero: projector.
All in the menu, there are LAMP words this column, all YES. . .
7, 3M projector zeroing method.
Hitachi OEM's Clear method: at boot, press RESET and health 3 seconds, there will be a time of dialogue, select 0 fine. .
8, Mitsubishi (Mitsubishi) projector zeroing..
Mitsubishi projector cleared Methods: Press the left + right + under standby power. .
While some are more complicated, be careful.
1, Epson (Epson) projector clear way. .
Epson projector zeroing method (only applicable at the lamp resistance) of the machine, in the frame at a low resistance (zero by), as long as the machine corresponds to a four small pin shorted out, this is annoying, and short circuit could not well be possible to burn the motherboard.
2, NEC (Xinhua) projector clear way. .
830/840/850/440 series time to appear second indicator light, including the LAMP led, zero is standby OFF key pressed under 20 seconds or so, the bottom of the remote control has a headphone jack, so if the cable you can connect to the projector's remote control input, so it will be convenient to zero.
3, PLUS (PLUS) projector clear way:. .
PLUS U2-811-815 U2 U2-815C U2-1110 U2-1130 U2-X1130C U2-1150, bulb at 1100 hours zero menu selection to a time, press the ON8 seconds. After using 1100 hours no State direct press ON25 seconds.
PLUS U3-810SFC U3-1080SFC U3-810WZC U3-1080WZC U2-X200UC 4-161 U4-121, V-1080C V-807C V-1100C U2-850 U2-1500 U2-850W U2-1500W U5-121 U5-162 , lamp timer reset menu. .
4. INFOCUS (rich visual) and ASK (u vote for God), Proxima (Bao Shi MA), IBM projectors zeroing:.
Generally clear in the menu, InFocus 500/530 in the boot, press menu + volume minus 3 seconds, then open the menu to see if there is no clear, if not you can try more than once, IBM is INFOCUS OEM reference INFOCUS. .
5. SHARP (sharp) zero: projector.
Sharp Video Machine (PN200/300/500/C10, etc.) clear bulb time, standby, press and hold "volume reduction" + "Select the next" after the boot. .
Sharp 100S/00X/200/220, projector bulb zero method, press standby-, +, AUTOSYNC three keys, after power-on.
Note: SHARP back out of the machine (new 2004) do not arbitrarily clear, clear to zero, then we should replace the bulb, otherwise the lamp will fry in about 200 hours. .
Method.
1, +5 VSB, PS-ON, PW-OK control signal. .
ATX power supply and power AT the most significant difference is that the former was canceled by the traditional power switches, reliance on + 5VSB, PS-ON control signals that the power of the opening and closing. + 5VSB is for the host system in ATX standby power, and open and close automatically managing and remote wake-up communications related circuit of power in standby and controlled start state, its output voltage is 5V, purple line from ATX plugs 9 feet. PS-ON to host opening and closing the power or the network computer remote wake-up power supply control signal, different types of ATX switching power supply, standby voltage value of 3V, 3. .6 V, 4. .6 V varies. When you press the host panel POWER switch or the remote wake-up boot for network, controlled by the PS-ON activated electronic switch motherboard ground, use the green line plug from the ATX 14 pin input. PW-OK is good or bad for the motherboard detect the output signal power, using the gray line from the 8-pin ATX plug leads, standby zero level, controlled start for the 5V voltage output is stable high. .
Offline Live detection of ATX power supply, first measurements of the standby signal, PW-OK PS-ON and former high level, which is a low level, 9 feet except output plugs + 5VSB, not other voltage output. Second is to wake people ATX switching power supply, the ATX plug with a wire 14 feet PS-ON signal, and either to end (3,5,7,13,15,16,17) kick in the shorts, This step is to test the key, the ATX power supply from the standby wake-up to start the controlled state, then PS-ON signal is low, PW-OK, +5 VSB signal is high, ATX plug +3. .3 V, ± 5V, ± 12V with output switching power supply fan rotation. The operation may be used as optional ATX power switch power off-line authentication method. .
Second, the principle of control circuit.
ATX switching power supply, the circuit is divided into its component function: AC input rectifier filter circuit, pulse half-bridge power conversion circuit, auxiliary power supply circuit, PWM control circuit, PS-ON and PW-OK generating circuit, automatic voltage regulator and protection control circuits, multiple DC output circuit. Refer to the following chart. .
1. the auxiliary power supply circuit.
As long as there is AC power input, ATX switching power supply, whether or not to open, its auxiliary power supply has been working for switching power supply control circuitry to provide voltage. Electricity via high-voltage rectifier, filter, output ripple voltage of about 300V DC, all the way through R72, R76 to the auxiliary power switch Q15 base and the other passing switch transformer primary winding T3 added to Q15 collector to Q15 conduction. Feedback winding T3 induction potential (on the under negative) slip through the positive feedback C44, R74 to Q15 base increases, so that Q15 saturated conduction.Feedback current through R74, R78, Q15 b, e very equivalent resistance on the capacitor charging, along with the C44 C44 charging voltage increase base current flowing through the Q15 gradually decrease, T3 feedback winding EMF-RP (responsible under), and voltage overlay to Q15 C44 base, Q15 base electrode potentials becomes negative, switching quickly closing.
Q15 deadline, ZD6, D30, C41, R70 Q15 base composition of negative bias cut-off circuit. Feedback winding EMF's are side by C41, R70, D41 to the induced potential negative side formation charging circuit, C41 negative negative voltage, Q15 base potential as D30, ZD6's turn, was clamped in the ratio of C41 negative high voltage of about 6 . .8 V (diode voltage drop and the regulator value) on the negative potential. Positive feedback also slip through T3 C44 charge voltage feedback winding, R78, Q15 of the b, e very equivalent resistance, R74 form a discharge circuit.With the charge current to gradually reduce the C41, Ub potential rise when Ub potential increased to Q15 of b, e very open voltage, Q15 again breakover, enters into the next cycle of oscillation.
Q15 During the saturation, T3 induction of secondary winding output potential is negative, the rectifier end, flows through a winding of conduction current in the form of magnetic energy stored in the auxiliary power transformer T3. When Q15 shift from the saturated end, the secondary winding of the induction of two potential output is positive, T3 storage of magnetic energy into electricity through BD5, BD6 rectifier output. Which BD5 rectifier output voltage for Q16 7805 three-terminal regulator work, Q16 output +5 VSB, if the voltage is lost, the motherboard will not start automatically wake ATX power supply.BD6 rectifier output voltage supply IC1 PWM TL494 12 foot power input, the output voltage 5V 14 feet, ATX power supply control circuit of all components of the operating voltage.
2. . PS-ON and PW-OK, pulse width modulation circuit. .
PS-ON signal control IC1 's 4 feet voltage, the dead zone, motherboard and close when the standby control circuits of electronic switches disconnected PS-ON signal high level 3 .6V, IC10 precision. regulator of Ur potential rise WL431, Uk on potential, Q7, voltage 5V through c of e, Q7, R80, D25 and the D40 is being fed into the IC1, 4 4 feet above the foot when 3V, block 8, 11-foot pulse width modulation output so that the T1 T2 drive transformer, the main power switch, transformer stop vibration ceased providing + 3 .3V, + 5V., ± 12V output voltage. Controlled startup, PS-ON signal from the hoist control circuit board ground electronic switch, IC10 of Ur zero potential, Uk potential rose to +5 V, Q7 end, c is extremely zero potential, IC1's 4 feet low, 8,11 feet to allow the output PWM signal.IC1 's output control voltage 5V 13 feet then, pulse width modulator for parallel push-pull output, 8, 11-foot output phase 180 degrees of pulse width modulation control signal, the output frequency to IC1 's 5, 6 foot external timing components of oscillation frequency control of the half, Q3, Q4 of c is the primary winding of the transformer T2 promoting incentive oscillation, T2 subordinate its oscillation effects of EMF in T1 main power switch on a winding of the transformer, the secondary winding of EMF through rectifier formation + 3 .3V, + 5V., ± 12V output voltage.
Help implement Q3, Q4 are connected emitter of D17, D18 and C17 for the elevation Q3, Q4 emitter level, to Q3, Q4 base a reliable cut-off low pulse. C31 blocked for instant power output of IC1 of 8,11 foot pulse, ATX power supply charged moment, not because the voltage across C31 mutation, IC1's 4 feet high there, 8,11 no driving pulse output pin. With the C31 charge, IC1's start from the PS-ON signal. .
PW-OK generation circuit by IC5 voltage comparator LM393, Q21, C60 and the surrounding components. Standby IC1 feedback control-3 feet for low-level, Q21 saturated breakover, IC5 in 3 feet being input, low-voltage is less than 2 feet negative side entered Fixed divider ratio, 1 foot low voltage, output to host PW-OK zero-level power on self test signal, host stops working in standby state leisure. IC1 controlled post up to 3 feet potential, Q21 into the amplification by the saturated conduction state, e great potential of 5V from the regulator on the C60 charge through R104 to establish, with the gradual charging C60, IC5 control level of 3 feet gradually increased to 3 feet once IC5 potential greater than 2 feet of the fixed partial pressure ratio, by the positive feedback of hysteresis comparators, a foot high in the PW-OK output signal. This signal is equivalent to AT power supply PG signal, the switching power supply output voltage and then delayed several hundred milliseconds from the zero-level jump from +5 V, the host detects PW-OK after the power good signal to start the system.The host is running in the event of a mains power failure or a user shuts down, ATX power supply + 5V output voltage must fall, the amplitude of the feedback signal is sent to IC1 component in-phase voltage sampling amplifier-1 foot, caused a chain reaction will be as follows: make the IC1 feedback control-3 foot potential, R63 coupled to the Q21 's base electrode, with the potential base Q21, once the Q21 e, b very potential reach 0. 7V, Q21 saturated conduction, IC5 potential decreased rapidly to 3 feet, 3 feet when the potential is less than 2 feet of the fixed points piezoelectric usual, IC5 output of a pin will immediately jump from zero the next level 5V, shutdown PW -OK output signal than the ATX switching power supply +5 V output voltage of a few hundred milliseconds before disappearing, to inform the host to trigger the system automatically shut down before power loss in power to prevent a sudden power-down when the hard disk heads to move the landing zone was too late scratch disk. .
3. automatic voltage control circuit.
1,2 IC1 pin voltage sampling amplifier positive and negative input, sampling resistor R31, R32, R33 constitute a +5 V, +12 V automatic voltage regulator circuit. When the output voltage rises (+5 V or +12 V), obtained from the R31 sample voltage sent to the IC1 1 foot and 2 feet compared to the reference voltage, the output error voltage and sawtooth wave generation circuit chip oscillation pulses in PWM comparator compared to enlarge, so that the output pulse width of 8,11 feet lower, the output voltage down to within the standard value, whereas the opposite regulator control process, so that switching power supply output voltage.IC1 's current sampling amplifier negative side input voltage regulator 5V received 15 feet, just enter the 16-foot grounding, the current sampling amplifier in PWM control circuit is not in use.
1. ATX Power Supply ATX power supply block diagram of the principle block diagram shown. Can be seen from the chart, ATX power supply AT power supply circuit and the main change is similar to using dual half-bridge circuit is excited. The core of the whole circuit pulse width modulation (PWM) control chip, most ATX power supplies are used TL494 (or its replacement chip), the use TL494's ④ foot "dead zone control" feature to achieve the main transform circuit opened and closed. .
2. how to determine the scope because the computer power is set over voltage, over current protection circuit, power failure, mostly to host power no indicates that the host is not started, the monitor has no display, the power supply fan is not turning. As a part of the motherboard ATX circuit called "power detection module", it is possible to control the power of the opening and closing, this part of the circuit has failed to show for the above symptoms. So, how determined is the ATX motherboard power failure or malfunction? ATX power supply and motherboard through a 20 feet between the double rectangular integrated plug connections, 14 feet (green line) for the PS-ON signal, the motherboard is the signal to control the power supply through the opening and closing. When the board power supply, "Power detection components" to PS-ON signal is high, the power is turned off; when the board so that PS-ON signal is low, the power supply work, supply to the motherboard.When an ATX power supply is not connected to the motherboard, power supply internal provides PS-ON signal, ATX power supply does not work on standby. When the computer is powered on after opening, all power plugs, 14 feet and ground (black line) wire, if the power supply fan rotation, the output is correct, you can determine the power is normal, it is a power failure.
3. ATX Power Supply Fault Maintenance (l) no 300V DC voltage. This failure, first check from the AC input socket, the fuse, rectifier diode (bridge), filter capacitor is always a bad element. After finding faulty components, but also check the main power switch converter circuit and its subsidiaries, in ensuring its normal, can increase power, because power failures are usually caused by damaged components.The use of high-power tube MJE13007 (400V/8A/75W), is the failure rate highest component, replace the selection parameters when you want to is equal to or greater than the original parameters of the pipe, it is necessary to pay attention to the parameters of the two tubes should be consistent. (2) powered auxiliary power supply properly, start the main power supply voltage and the output. This failure has two possibilities: one is the primary circuit failure, the second is to control the portion of the damage. First, check the half-bridge power control static and its subsidiary circuit and driver circuit, without failure, check the TL494 ④ foot in the PS-ON signal is low when it becomes low, if not change, is the PS-ON processing circuit fault there are changes, then check 8, 11 feet with or without pulse output, if no damage is TL494. (3) 300v DC voltage, the auxiliary power supply does not work. This is the most common faults. +300 V showed normal, no +5 VSB voltage, Tl494 12-foot no-voltage, you can determine the auxiliary power supply failure, the auxiliary power supply common circuit diagram shown in Figure 3.This is typical of single-tube since switching power supply circuit, the transformer secondary and two-channel T3 output through rectifier filtering the 7805 voltage, output voltage Vo1 5VSB; the other, directly after the rectifier filter added to the 12 feet, TL494 as TL494 work power, because the voltage TL494 ranges (7 ~ 40V), this way is not and stabilizing measures. 14 foot TL494 benchmark + 5V output (VREF), to protect the circuit, P. .G generation circuit and PS-ON processing circuit, as these circuit voltage. As the circuit is simple, not well regulated control and protection circuit, so that the auxiliary power supply circuit as ATX power supply in the higher part of the failure rate, often damaged component is the power control and power resistors (4. .7 Ω), in particular, power management start-up resistor (300kΩ). In addition, the auxiliary power supply fails, the output is too high, they may cause parts of its power supply circuit without damage, such as the TL494, etc. This is the ATX power supply features out of the decision.When the computer is turned off, the city has not broken, the auxiliary power supply always work, especially at night, the city may be very high, and the auxiliary power supply is relatively simple, so easy to damage the auxiliary power supply circuit. In general there are no special circumstances if soft shutdown for a longer period of time without cutting off the power supply should be.
(4) separate ways voltage normal, non-P. . G signal. In the power-supply, the auxiliary power supply first establish VREF (LM393 power for VREF), TL494's ③ feet to provide a lower voltage, transistor A733 turn, LM393's output low ① feet. When open the main ATX power transformation circuit, TL494's ③ feet to maintain than high, so diode A733 is off, VREF through a capacitor (4. .7 UF) charge, after a period of delay, the output +5 V for P. . G signal, the host to work.When the output voltage is low, detection circuit TL494 and sent to the detection voltage is reduced, if the voltage is lower than the rated range, TL494 ③ foot level will be lowered to low level, transistor breakover A733, l. ① feet of M393 outputs, host to stop working. The failure occurred is generally bad, IC P LM393. .G constant low-level, but may be shorted triode, P A733. .G signal clamp at low level. This part of the circuit due to the low operating voltage, resistive and capacitive components rarely fails. More exchange the defective component, you can rule out the failure. .
