6-5. D Board P1 and P2This output is also controlled by the output signal from
microprocessor in the same manner as in the case of ? 6 V
1. D board - P1power.
The P1 block of the D board is the DC-DC converterThe floating power voltages (HC+, HC_ and HC N) are
circuit that generates the following power voltages to begenerated by rectifying and smoothing out the output
used in the monitor: Standby 5 V (abbreviated as ST5voltage form the secondary winding of the transformer
hereafter), +/- 12 V, +/- 6 V, +/- 5 V, + 24 V and theT3601 that receives the DC. IN voltage to its primary
floating power source (HC+, HC-, HC N) for the H.winding after the DC. IN voltage is switched by the +12 V
CENTER circuit.regulator FET.
The DC-DC converter receives the DC power input (the24 V power is generated by rectifying and smoothing out
DC input voltage line is called DC. IN) from variousthe voltage that is induced across pin-5 and pin-6 of T3601
sources such as the DC input that is generated by thethat receives the input power at its primary winding pin-7.
external power supply board (G board) or the DC input
from lithium-ion battery or the DC input that is directly2. D board - P2
supplied from any external DC power supplies. TheThe P2 block of the D board consists of the horizontal and
acceptable range of the DC. IN input voltage is from 11 Vvertical sync signal processing, sync signal delay process-
to 17 V. The DC. IN input voltage is compared with theing, deflection system control, BLKG signal processing,
output of the shunt regulator IC1601 by the comparator+B power supply circuit for horizontal output, horizontal
Q1601. When the DC voltage of 11 V or less or 17 V orand vertical output circuits and the H. CENTER circuit.
higher is input, the relay RY1601 that is inserted in the
input line, is activated to turn off the DC power input in..... Sync Signal Processing, Sync Signal Delay Processing
order to protect the subsequent circuit from being dam-and Deflection System Control Circuits
aged. The DC voltage that is supplied from the powerThe horizontal and vertical sync signals that are input
supply board is 13 V.ST5V is generated by the PWMfrom CN2501 (pins-1/-2) are sent to the H/V DELAY
controller consisting of IC1602 and FET Q1604 that is atiming circuit consisting of IC2513, IC2512, IC2509 and
regulator. The output voltage from the regulator is volt-IC2519. The H/V DELAY timing circuit outputs the
age-divided and is compared with the reference voltagesignal that repeats H/L at every half-cycle of the H. and
that is created by IC1601, by the comparator IC1602. TheV. input signals. This output signal is shaped of its
error output from the comparator controls the ON time ofpulse-width by IC2505 and is sent to IC2503 that is the
the pulse amplitude (frequency of the pulse is about 66deflection system signal processing IC. During normal
kHz) that is applied to Q1604 gate. ST5V is always outputoperation of the monitor, the H/V DELAY timing circuit
whenever the DC. IN voltage is input, and does notoutputs the sync signals that have the same phase as
depends upon the POWER switch operation. The circuitthose of the input signal. However, during the H.
Q1608 to Q1610 is the switch that turns off the PWM ICDELAY mode and the V. DELAY mode, the signal that
output when the DC. IN input voltage is outside theis inverted of its phase by IC2517 and IC2516 is input to
operating range of this regulator circuit. Q1611 to Q1613IC2505, the output sync signals are generated from the
are the transistors to drive Q1614.edges that correspond to the half-cycle of both horizontal
+6 V power is generated by the PWM controller IC2601and vertical periods. Thus the H. DELAY and the V.
and the regulator FET Q2607. -6 V power is generated byDELAY are realized.
the PWM controller IC2601 and the regulator FET Q2612.The deflection signal processor IC2503 (TDA9106)
? 6 V power depends on the POWER switch. Output ofoutputs the various signals that are required for deflec-
the ? V power is controlled by the control signal that istion, such as horizontal drive signal, parabola signal for
supplied from microprocessor. When the POWER switchdynamic focusing, parabola signal for picture distortion
is turned off, output from IC2601 is turned off by Q1617,correction, vertical drive signal and H/V blanking
Q2601 to Q2603 so that ? 6 V power output is turned off.signals. These output signals are controlled directly by
? 5 V power is generated by the 3-terminal regulatorthe microprocessor in the MA board through I2C bus.
IC2602 and IC2603 from the ? 6 V input power.The horizontal free-running frequency is set for about 18
? 12 V power is generated by the PWM controller IC3601kHz. The pull-in range of the input signal frequency is
and regulator FET Q3607, Q3609 and Q3613.from 15 kHz to 45 kHz.
6-4BVM-D9H1U/D9H5U/D9H1E/D9H5E/D9H1A/D9H5A |
ACEC
