Hitachi dp4x schematic
September 2006 (ver v)
HITACHI
PROJECTION
TELEVISION
2004 MODEL RELEASE
DIGITAL HD READY PTV
Model Chassis Remote P/N
57S715
51S715
65F710
57F710
51F710
51F510
57F510
DP-47 CLU-3842WL HL02062
DP-47 CLU-3842WL HL02062
DP-45 CLU-4341UG2 HL02071
DP-45 CLU-4341UG2 HL02071
DP-45 CLU-4341UG2 HL02071
*DP-43 CLU-4341UG2 HL02071
*DP-43 CLU-4341UG2 HL02071
* Does Not Have a
Digital Module. No
ATSC Tuner.
Service Web Site
http://www.hitachiserviceusa.com
CONTENTS... 2004 DP-4X Chassis Projection Television Information
Materials Prepared by… Alvie Rodgers C.E.T. (Chamblee, GA.)
DP-4X BLANK PAGE (NOTES)
BLANK PAGE
September 2006 (ver v)
TOPICS PAGE
SECTION (1) POWER SUPPLY DIAGRAMS:
DP-4X TABLE OF CONTENTS
• Generic Power Supply Circuits Explained ---------------------------------------------------------- 01-01
• Deflection Side Shutdown Circuit Diagram Explained ------------------------------------------- 01-04
• Deflection Side Shutdown Circuit Diagram Explained ------------------------------------------- 01-05
• PROT_OVP and PROT_OCP Shut Down Circuit Diagram Explanation -------------------- 01-06
• PROT_OVP and PROT_OCP Shut Down Circuit Diagram ----------------------------------- 01-07
• Deflection Power Supply Shutdown Output Circuit Diagram Explained -------------------- 01-08
• Deflection Power Supply Shutdown Output Circuit Diagram --------------------------------- 01-09
• Signal Power Supply Shutdown Circuit Diagram Explained ----------------------------------- 01-10
• Signal Power Supply Shutdown Circuit Diagram ------------------------------------------------ 01-12
• Stand By +5V Power Supply Generation Circuit Diagram and Explanation ----------------- 01-13
• Power Supply Relay Control Circuit Diagram Explained --------------------------------------- 01-14
• Power Supply Relay Control Circuit Diagram ---------------------------------------------------- 01-15
• SW +115V Hi Voltage Regulation Circuit Diagram Explained --------------------------------- 01-17
• SW +115V Hi Voltage Regulation Circuit Diagram ---------------------------------------------- 01-18
• IP01 Voltages and Waveforms ---------------------------------------------------------------------- 01-18A
• 5.7V Volt Regulation Circuit Diagram Explained ------------------------------------------------- 01-19
• 5.7V Volt Regulation Circuit Diagram -------------------------------------------------------------- 01-20
• LEDs (Visual Trouble Shooting) Deflection Power Supply Circuit Diagram Explained ----- 01-21
• LEDs (Visual Trouble Shooting) Deflection Power Supply Circuit Diagram ------------------ 01-22
SECTION (2) MICROPROCESSOR INFORMATION:
• Microprocessor DATA COMMUNICATION Explanation ------------------------------------- 02-01
• Microprocessor DATA COMMUNICATION Circuit Diagram ------------------------------------ 02-05
• Audio Video Mute Circuit Diagram Explanation -------------------------------------------------- 02-06
• Audio Video Mute Circuit Diagram ------------------------------------------------------------------ 02-09
• Microprocessor NTSC Sync Input Circuit Diagram Explained --------------------------------- 02-10
• Microprocessor NTSC Sync Input Circuit Diagram Circuit Diagram ------------------------------ 02-11
SECTION (3) VIDEO CIRCUIT INFORMATION:
• Video Signal Selection Circuit Diagram Explained ------------------------------------------ ----- 03-01
• Video Signal Selection Circuit Diagram ------------------------------------------------------------ 03-03
• Composite Video Signal Path 1H NTSC Circuit Diagram Explanation ----------------------- 03-04
• Composite Video Signal Path 1H NTSC Circuit Diagram ------ ----------------------- --------- 03-06
• RGB Processor (Rainforest) Circuit Explanation ------------------------------------------------- 03-07
• RGB Processor (Rainforest) Circuit Explanation ------------------------------------------------- 03-09
• ABL Circuit Diagram Explanation ------------------------------------ ----------------------------- --- 03-10
• ABL Circuit Di agram ----------------------------------------------------------------------------------- 03-11
• H and V Sync to the Rainforest IC Circuit Diagram Explanation ----------------------------- 03-12
• H and V Sync to the Rainforest IC Circuit Diagram --------------------------------------------- 03-14
Materials prepared by
Alvie Rodgers C.E.T.
Continued on Next Page
Table of Contents Page 1 of 2
September 2006 (ver v)
TOPICS PAGE
SECTION (4) AUDIO CIRCUIT INFORMATION:
DP-4X TABLE OF CONTENTS
Materials prepared by
Alvie Rodgers C.E.T.
• Audio Signal Selection Circuit Diagram Explanation --------------------------------------------- 04-01
• Audio Signal Selection Circuit Diagram Explanation --------------------------------------------- 04-03
SECTION (5) DEFLECTION CIRCUIT:
• Horizontal Drive Circuit Diagram Explanation ----------------------- ----------------------------- 05-01
• Horizontal Drive Circuit Diagram ------------------------------------- ------------ --------- --------- 05-03
• IH01 Horizontal Drive IC Voltages and Waveforms (Also, Not Running Info.) ------------- 05-04
• Sweep Loss Detection Circuit Diagra m Explanation ----------------------------------------------- 05-05
• Sweep Loss Detection Circuit Diagram --------------------------------------------------------------- 05-06
• Vertical Output Circuit Diagram Explanation ----------------------------------------------------- 05-07
• Vertical Output Circuit Diagram --------------------------------------------------------------------- 05-08
• Side Pincushion Circuit Diagram --------------------------------------- --- --------------------------- 05-09
• Side Pincushion Circuit Diagram --------------------------------------- --- --------------------------- 05-10
SECTION (6) DIGITAL CONVERGENCE CIRCUIT INFORMATION:
• Digital Convergence Interconnect Circuit Diagram Explanation ------------------------------- 06-01
• Digital Convergence Interconnect Circuit Diagram ---------------------------------------------- 06-06
• CLU-3842WL Re mote Control ------------------------------------------------ ----------------------- 06-07
• CLU-4341UG2 Remote Control ------------------------- --------------------------------------------- 06-08
• Adjustment Marker On/Off Explanation ----------------------------------------------------------- 06-09
• Adjustment Marker Movement by CH UP and CH DOWN Explanation --------------------- 06-10
• Convergence Adjustment Using and Outside Signal Explanation ------------------------------ 06-12
• Sensor Error Codes Explanation and Chart ----------------------------- --------------------------- 06-13
SECTION (7) CHASSIS PICTURES:
• Main Chassis Picture ----------------------- ------------------------------------------- ---------------- 07-01
• Signal PWB Picture ------------------------------------------------------------------------------------ 07-01
• Deflection PWB Picture ------------------------------------------------------------------------------- 07-02
• Convergence Output PWB Picture ----------------------------------------------------------------- 07-02
• Digital Convergence Unit (DCU) Picture --------------------------------------------------------- 07-03
• Sub (Signal) Power Supply PWB Picture ------------------------------ ------------- -------------- 07-03
• Tuner PWB Picture ------------------------------------------------------------------------------------ 07-04
• HDMI to DVI Adaptor Cable Comparison Picture --------------------------------------------- 07-04
• DP-43 Rear Panel (Rear Inputs) Picture ---------------------------- ------------------------------ 07-05
• DP-45 Rear Panel (Rear Inputs) Picture ---------------------------- ------------------------------ 07-06
• DP-47 Rear Panel (Rear Inputs) Picture ---------------------------- ------------------------------ 07-07
SECTION (8) SERVICE ADJUSTMENTS:
• See the index for this section after the Section 8 Divider. -------------------------------------- 08-00
SECTION (9) THINGS YOU SHOULD KNOW: Must be downloaded separately.
• See the index for this section after the Section 9 Divider. -------------------------------------- 09-00
SECTION (10) SERVICE POLICY:
Service Policy and PWB Part Numbers. --------------- ------ ------- ----- ------ ------- ----- ------ ------- ----- 10-01
Table of Contents Page 2 of 2
POWER SUPPLY
INFORMATION
DP-4X
CHASSIS INFORMATION
SECTION 1
DP-4X BLANK PAGE “NOTES”
BLANK PAGE
DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
GENERIC SHUTDOWN CIRCUITS EXPLAINED:
The following circuits are commonly used in Hitachi product and relate to the drawings for Shutdown:
SW +115V EXCESSIVE CURRENT DETECTION
(See Figure 1)
One very common circuit used in many Hitachi television products is the B+
circuit. In this circuit is a low ohm resistor
ing
in series with the SW +115V. The value of this resistor is
0.39 ohm
creases, the voltage drop across the resistor increases. If the voltage drop is sufficient to reduce the
voltage on the base of
duct, producing a Shutdown signal that is directed to
the appropriate circuits indicated on the drawing for
Deflection Power Supply Shutdown Output Circuit,
OCP & OVP.
NEGATIVE VOLTAGE LOSS DETECTION
(See Figure 2)
The purpose of the Negative Voltage Loss detection circuit is to
compare the negative voltage with its counter part positive voltage. If at any time, the negative voltage drops or disappears, the
circuit will produce a Shutdown signal.
In Figure 2, there are two resistors. One to the positive voltage
+5V and one to the negative voltage –5V. At their tie point,
(neutral point), the voltage is effectually zero (0) volts, actually
about 1 Volt negative. If however, the negative voltage is lost,
the neutral point will go positive. This in turn will create a Shutdown Signal through
dicated on the drawing for Deflection Power Supply Shutdown
Output Circuit, OCP & OVP.
VOLTAGE TOO HIGH DETECTION
(See Figure 3)
Another circuit used is the
circuit. In the example shown in Figure 3, the
tion
zener diode
and
RP38
the voltage at the divider center point will rise as well
and trigger or fire the zener diode which produces a
Shutdown signal through
priate circuit indicated on the drawing for Deflection
Power Supply Shutdown Output Circuit, OCP & OVP.
. When the current demand in-
DP39
. If the voltage source rises too high,
RP39
Excessive Current Sens-
RP34
, the transistor will con-
QP05
and on to the appropriate circuit in-
DK18
Voltage Too High Detec-
is connected to a voltage divider
and on to the appro-
DP38
SW+115V
CP46
Voltage Loss
RK23
2.7K
DP39
DP38
RP34
Current Sensor
QP05
Figure 1
Shutdown Signal
Negative
Detector
SW +5V
RP38
RP39
Figure 3
0.39
RP35
Base
Bias
RP36
Shutdown Signal
DK18
RK22
1.8K
SW -5V
Figure 2
SW +115V
Voltage Too
High Detector
Shutdown
Signal
(Continued on page 6)
PAGE 01-01
DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
VOLTAGE LOSS or SHORT DETECTION
(See Figure 4)
One circuit used is the Voltage Loss Detection circuit. This is a very simple circuit that detects a loss of
a particular power supply and supplies a Pull-Down
path for the base of a PNP transistor.
This circuit consist of a diode connected by its cathode to a positive B+ power supply. Under normal
Voltage
Loss
Detector
conditions, the diode is reversed biases, which keeps
the base of Q1 pulled up, forcing it OFF. However, if
there is a short or excessive load on the B+ line that’s
being monitored, the diode in effect will have a LOW
on its cathode, turning it ON. This will allow a cur-
Figure 4
Shutdown Signal
rent path for the base bias of Q1, which will turn it
ON and generates a Shutdown Signal.
GENERAL INF O RMATION:
This explains the Overall Power Supply Shutdown Circuits:
Which turns off the Relay Driver for the Deflection Power Supply and the Relay for the Signal Power Supply.
DEFLECTION (High Voltage) POWER SUPPLY:
The Deflecti on Po wer supply is centered around th e Switching Transfor mer TP01 and the driver IC, IP01.
This power supply creates vo ltag es tha t are Swit ched on wh en the Set is turned on.
1. SW +115V 2. +220V
3. +28V 4. SW-28V
5. +7V 6. SW +6.3V
Other supplies are generated from these 6 main voltages.
SIGNAL (Low Voltage) POWER SUPPLY:
The Signal Power supply is centered around the Switching Transformer T201 and the driver IC, I201.
This power supply creates vo ltag es tha t are Swit ched on wh en the Set is turned on.
1. 38.5V or 29V 2. +10.5V
3. +21V 4. SW-5.6V
5. +16V 6. SW +5.7V
Other supplies are generated from these 6 main voltages.
Q204 and Q203 Relay Inhibit Activation. (SHUTDOWN) called COMMON ACTION CIRCUIT.
All Shutdown events will cause the main power relays to turn off. This action will stop all secondary power supplies.
The Low Voltage power supply (Stand-By) will Shutdown along with the Deflection Power Supply.
See the DP-4X Signal Power Supply Sh ut d ow n Circuit for detail s.
If any of the shutdown circuits activate, the base of Q203 will go High. This turn s on Q203 and r emoves the Power On Highs
from PPS1 connector pins 9 (Power_Sig) an d 11 (Power_Def) called Power_1 and Power_3. With this, the main power sup-
plies will STOP . Q204 ope r at es a s a “latch”. Th i s pr e vents Q203 from turning off if the shutdown signal disappears after
shutdown.
SOME SHUTD OW N CIRCUITS ARE DEF E AT ED IN STANDBY M O DE . (Set Off).
When the set is turned off (called Stand By), some of the shutdown inputs are not active because the voltages being monitored
are not on.
• Shorted FAN +10V (from from pin 3 of IC303). This voltage is monitored by D313.
• Stopped Fans PPF2 and PPF3 pin 2. This is monitored by D313.
• Shorted Drv 16.5V (from pin 2 of IC301) This voltage is monitored by D312.
• Prot_Drv (from pin 48 of PPS1) This voltage is monitored by D312.
• Prot_OCP (6 shutdown inputs) This voltage is monitored by D944.
1. SW +2.2V (IV01) * 2. SW +3.3V (IY01) * 3. SW +9V (IY07) *
4. VM +220V (QEA8) * 5. SW +6.3V (QP04) ** 6. SW +28V (DP30) **
* See the PROT_OVP and PROT_OCP Shutdown Diagram.
** See the Deflection Power Supply Shutdown Output Circuit Diagram.
Any Positive
B+ Supply
B+
Q1
(Continued on page 3)
PAGE 01-02
DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
(Continued from page 2)
See the DP-4X Signal Power Supply Shutdown Circuit for details.
These shutdown circuits are defeated because the SW (Switched) power supplies are turned off in standby. So to prevent
faults triggering of the shutdown circuit, the sensing circuits are turned off also..
Q206
generates the shutdown high signal if any of the shutdown circuits attached to its base become low.
ter voltage to operated.
When the set is turned off,
SHUTDOWN INPUTS EXPLAINED:
GENERAL INFORMATION CONTINUED:
All of the Power Supply Shutdown circuitry can be broken down into the following categories;
Voltage Missing Detection or Short Detection or Negative Voltage Loss Detection
•
Voltage Too High Detection
•
Excessive Current Detection
•
COLD GROUND SIDE SHUTDOWN SENSING CIRCUITS.
All shutdown events arrive at the base of
The shutdown circuit are broken down into four pages. The shutdown outputs from each page are interconnected and indicated by symbols shown below;
A
B C D E F
Please refer to the following Diagrams as you continue to read the following explanations.
The DP-4X Deflection Side Shutdown Diagram for (A), (B), (C), (D).
1.
The DP-4X PROT_OVP and PROT_OCP Shutdown Diagram for (A), (B), (E), (F).
2.
The DP-4X Deflection Power Supply Shutdown Output Circuit Diagram for (C), (D).
3.
The DP-4X Signal Power Supply Shutdown Circuit for (E), (F).
4.
RY05
supplies the 5.7V to the Emitter of
RY05
opens and the 5.7V disappears so
(See previous two pages for generic shutdown circuit details)
Q203
. The shutdown events are categorized in the following pages.
Q206
. This voltage must be active for
Q206
can no longer operate.
(AC must be removed to recover).
Q206
requires emit-
Q206
to function.
:
PAGE 01-03
DP-4X DEFLECTION SIDE SHUTDOWN DIAGRAM EXPLANATION
See The DP-4X Deflection Side Shutdown Diagram for (A), (B), (C), (D).
HIGH VOLTAGE TOO HIGH DETECTION: One of the Shutdown circuits for outp ut (A).
•
DH15 High Voltage Too High Sensing Circuit.
This circuit monitors the
. If the voltage created by rectifier
7
zener will fire. This high will be routed to pin 8 of
PROT_OCP Shutdown Diagram
• At the same time, the zener diode
Horizontal Drive for High Voltage and this IC will shut off, turning off High Voltage drive pulses.
• The ABL is tied to the cathode of
as the screen brightness fluctuates and caused the High Voltage to bounce. By tying ABL to the Excessive
High Voltage detection voltage, the firing point is slightly altered.
VERTICAL OUTPUT CI RCUIT EXCESSIVE CURRENT DETECTION: One of the Shutd own circuits for
output (A).
•
Q604 Vertical Circuit Excessive Current Sensing Circuit.
This circuit monitors the
rent,
this transistor. When this happens, its collector will go high. This high will be routed through
pin 8 of
-5V NEGATIVE VOLTAGE LOSS DETECTION: One of the Shutdo wn circuits for output (A).
•
DK18 –5V Loss Detection Circuit.
The purpose of the Negative Voltage Loss detection circuit is to compare the negative voltage with its
counter part positive voltage. If at any time, the negative voltage drops or disappears, the circuit will produce a Shutdown signal.
There are two resistors. One to the positive voltage +5V
RK22
voltage is lost, the neutral point will go positive. This in turn will create a Shutdown Signal through
DK18
Shutdown Diagram.
PROT_OVP INPUT INDICATED BY (C) One of several Shutdown outputs for item (A).
• The
put from the Deflection Power Supply Shutdown Circuit Diagram. There are 3 circuits from the Deflection Power Supply Shutdown Circuit Diagram that provide inputs to this diagram.
• This is explained on Page 01-06.
SW +10.5V SHORT DETEC T INDICATED BY (D) Shutdown output for item (B).
•
D723
age disappears or is shorted,
output as a shutdown signal on the
will develop a larger voltage drop. This will cause the base voltage of
R629
PDS3 PROT_OVP (A)
. At their tie point, (neutral point), the voltage is approxima tely (-1V). If however, the negative
. This high wi l l be routed to pin 8 of
PROT_OVP
is attached to the B+
signal (Active High) is shown in the center left hand side of the diagram. This is an in-
High Voltage
SW+28V
SW +10.5V
D723
line generated by rectifying the pulse from the flyback
and capacitor
DH13
PDS3 PROT_OVP (A)
.
will fire and this high will be routed to pin 7 of
DH14
via
DH15
line going to
to the
PROT_OVP and PROT_OCP Shutdown Diagram.
PDS3 PROT_OVP (A)
line which is generated on the Signal PWB by
cathode will be pulled low generating a Low on Pin 9 of
PROTECT_OCP
. This resistor offers sli ght “Trigger Point” deviations
RH32
Vertical Output IC. If the IC draws too much cur-
I601
indicated as item
at the cathode of
CH17
and one to the negative voltage –5V
RK23
to the
(B)
DH15
to the
Q604
PROT_OVP and PROT_OCP
.
TH01
goes too high, this
PROT_OVP and
. This is the
IH01
to fall turning on
and to
D608
. If this volt-
QY62
and
PDS3
pin
PAGE 01-04
DP-4X DEFLECTION SIDE SHUTDOWN DIAGRAM
Any fluctuations in High Voltage will also be
reflected by the 50P output P/P.
By monitoring the 50P (50 Pulse) rises in High Voltage
will be sensed. If High Voltage climbs too high, DH15
will fire and trigger a shut down event.
DH14 will fire and stop High Voltage Horz. Drive
Flyback
RH32 allows ABL fluctuations to
manipulate the Trigger Point of Shut
Down as screen brightness varies.
ABL is inverse proportionate to
brightness.
This prevents false Shut Down triggering.
C
3
Active
PROTECT _OVP
From Deflection Power Supply Shut
Down Output Circuits Diagram.
Vertical Output Circuit
I601
SW 28V
7
R629
C604
L603
Q604
R630
C610
Excessive Vertical Current Det.
0.68 Ohm
D608
R631
Normal
R632
TH01
TH02
8
5OP
4
RH25
Hi Volt
H. Drive
IH01
H. Drive
110
7
OVP
ABL
RH32
DH15
RH24
Excessive Hi
Voltage Det.
1
DK18 Monitors the -5V and +5V lines going to the DCU.
If the -5V line is loss, the +5V line provides the Shut Down Hi.
On the Convergence Circuit Diagram Power Def. page 2 of 3.
High Voltage
Sensing Circuit
RH23
LH06
29.01V
CH17
Stops H. Drive
7
DH13
DH14
RH26
CH10 RH09
+5V
DK18
RK23
2.7K
-5V Loss Det.
-5V
RK22
PDS3
1.8K
If the Vertical Output IC has a problem, R629
will sense the current rise. The voltage drop will
be reflected at the base of Q604 turning it on
and producing a Shut Down high.
SW +10.5V
D723
D
SW +10.5V From QY62 SW +10.5V Regulator on Signal 5 of 5 Schematic.
8
10
9
SW
+10.5V
6
1
PROTECT _OVP
To Signal PWB
See Protect_OVP and Protect_OCP
Shut Down Diagram for Details.
PROTECT _OCP
To Signal PWB
PAGE 01-05
A
B
DP-4X PROT_OVP and PROT_OCP SHUTDOWN DIAGRAM EXPLANATION
PROT_OVP and PROT_OCP SHUTDOWN CIRCUITS EXPLAINED: (A) (B) (E) (F)
(See the PROT_OVP and PROT_OCP Shutdown Diagram for Details).
CPT PROTECT (+200V Excessive Current Detection):
•
On the RED CRT PWB +220V (VM 200V) Excessive Current Detection
Monitored by
The collector will go high. This high will go to the connector
high continues to the Green CRT PWB connector
and
CPT PROTECT
• This line is connected to the
Circuit, identified as
• Any High from this line is then routed to the
is routed to the Signal Power Supply Shutdown Circuit Diagram identified as
VM GAIN CONTROL (VM 200V Excessive Current Detection):
•
On the BLUE CRT PWB VM+220V Excessive Current Detectio n
Monitored by
it on.
The collector will go high. This high will go to the connector
high continues to the Green CRT PWB connector
• This line is connected to the
• This line is also connected to the base of
High to a Low on its collector.
• The collector of
and the
PROT_OCP (B)
VOLTAGE LOSS DETECTION CIRCUITS:
•
•
•
•
PROT_OCP
generates the SW +2.5V. If this line is shorted or missing, this line will drop Low.
IV01
generates the SW +3.3V.
IY01
missing, the cathode of
generates the SW +9V.
IY07
ing, the cathode of
PROT_OCP: LABELED AS OUTPUT (F).
Any low from this line is then routed to the
. From here this low is routed to the Signal Power Supply Shutdown Circuit Diagram and
(F)
again identified as
. If the
RE35
on the Signal PWB.
6 inputs active High.
(A)
. If the
REF1
is tied to several circuits. The
QY60
from the Deflection Side Shutdown Circuit from
which represents 1 shut down input from the Deflection Side Shutdown circuits.
DY04
draws too much current, the base voltage of
220V
connector which ties the inputs from the Deflection Side Shutdown
PDS3
VM220V
VM Signal
DY03
goes low which pulls the
(F)
draws too much current, the base voltage of
generation circuit and turns it off.
QY60
One of several Shutdown outputs for (F).
is connected to the SW +3.3V line. If this line is shorted or
DY03
goes low which pulls the
is connected to the SW +9V line. If this line is shorted or miss-
DY04
.
One of several Shutdown outputs for (E).
will fall turning it on.
QE08
pin 7 labeled as
ERG1
pin 3 labeled
PSC
connector pin
PPS1
One of several Shutdown outputs for (F).
EGB1
pin 2 labeled
PSC
. This transistor acts as an inverter to change the output
Voltage Loss Detection Circuits
PROT_OCP
PROT_OCP
connector pin
PPS1
VM PROT
identified as
47
pin 8 labeled
VM GAIN
PDS3
line low.
line low.
45
connector pin 9. Labeled as
identified as
VM PROT
on the Green CRT PWB
. From here thi s high
(E)
.
(E)
QEA8
GAIN CONT
.
will fall turning
explained below
PROT_OCP
. This
. This
PAGE 01-06
DP-4X PROT_OVP and PROT_OCP SHUTDOWN DIAGRAM
PROT_OVP SHUT DOWN DIAGRAM
+220V
VM
220V
PDC1
EGB2
2
QEA8
1
RE35
2.2 Ohm
QE08
CE10
REF1
10 Ohm
REF2
REE9
SW +2.2V Reg
RED CRT PWB
R.G.B. Drives
RE27
RE31
VM 200V
RE34
VM PROT
ERG1
7
GREEN
CRT
PWB
PSC
VM PROT
SIGNAL PWB
3
CPT
PROTECT
RE29
Text Indicates the Labels on the Schematic
PROT_OCP SHUT DOWN DIAGRAM
BLUE CRT PWB
VM Circuit
REF4
REF5
CEC1
SIGNAL PWB 2 of 3
DEB6
REF5
CONT
GAIN
EGB1
8
GREEN
CRT
PWB
PSC
VM GAIN
CONT
Also Shuts Off
VM Signal
Generation Circuit
2
1
Active Hi
VM GAIN
CONT
DEF. PWB /
DEF. POWER
PDS3PDS3
6
8
PROT_OVP
From Deflection
Side Shut Down
Circuit
Active Hi
PROT_OVP
7
5
PROT_OCP
Active Lo
A
PPS1
47
45
SIG
POWER
PWB
See Signal
Power Supply
Shut Down
Circuit
E
F
SW +5.7V
DM +10.5V
IV01
1
3 8
SW +3.3V Reg
IY01
1
SW +9V Reg
IY07
7
SW +2.5V
DEF. PWB /
DEF. POWER
PDS3
CZ04
3
SW +3.3V
DY03
RZ62
4
RL50
QY60
RZ60
35
SW +9V
DY04
3
RZHD
1
9
B
PROT_OCP
From Deflection
Side Shut Down
Circuit
SIGNAL PWB
PAGE 01-07
DP-4X DEFLECTION POWER SUPPLY SHUTDOWN OUTPUT DIAGRAM EXPLANATION
DEFLECTION POWER SUPPLY SHUTDOWN OUTPUT CIRCUIT DIAGRAM EXPLAINED: (C)
(See the Deflection Power Supply Shutdown Output Circuit Diagram for Details).
PROT_OVP: Identified as (C).
EXCESSIVE DEFLECTION 115V B+ CURRENT DETECTION: Part of several Shutdown outputs to (C).
•
•
•
•
EXCESSIVE DEFLECTION 115V B+ VOLTAGE DETECTION: Part of several Shutdown outputs to (C).
•
•
•
SW -28 VOLT SHORTED or MISSING DETECTION: Part of several Shutdown outputs to (C).
•
•
monitors
QP05
enough to turn on
ing an increase in the voltage drop across this resistor. If there is enough current the base voltage of
will drop enough to turn on t his transistor . When
fire zener diode
and
CP49
out and fluctuations on the anode of
DP37
and identified as
PROT_OVP
DP39
Deflection
DP37
and identified as
PROT_OVP
identified as
SW -28V Shorted or Missing Detection
Monitored by
zener to fire. This high will be routed through
PROT_OVP
PROT_OVP
identified as
RP37
cathode is connected the anode of
is routed to the Deflection Side Power Supply Shutdown Diagram also identified as
monitors the Deflection
115V B+
cathode is connected the anode of
Identified as
(C)
DP46
and identified as
Identified as
(C)
current draw.
RP34
. However, if there is a problem, the current draw through
QP05
and generate a high on the anode of
DP36
prevent faults triggering of the shut down line due to High Voltage bounce by smoothing
.
(C)
115V B+
line goes to o high,
.
(C)
is routed to the Deflection Side Power Supply Shutdown Diagram also
(C)
.
. If the
SW-28V
.
(C)
is routed to the Deflection Side Power Supply Shutdown Diagram also
(C)
.
is a 0.39 low ohm resistor. Normally the current draw isn’t
RP34
increases caus-
RP34
turns on, its collector goes high. This high will
QP05
DP37.
.
DP36
. This line is connected to the line labeled
DP38
line via the Voltage divider consisting of
will fire and generate a high on the anode of
DP39
. This line is connected to the line labeled
DP38
is shorted or missing, the cathode will be pulled high causing the
. This line is connected to the line labeled
DP47
RP38
PROT_OVP
and
RP39
.
DP37
PROT_OVP
QP05
(C)
. If the
.
PAGE 01-08
TP01
DP-4X CHASSIS
Deflection Power Supply Shutdown Output Circuit Diagram
OCP and OVP
+28V
-28V
16
15
14
DP30
CP30
CP32
CP33
DP31
CP31
+
+
CP49
RP37
LP30
LP31
LP33
RP46
+
CP34
DP50
+
CP35
RP47
DP37
DP36
GREEN
L.E.D.
-28V Short or Loss Detection
DP46 DP47
LP34
DP38
1.26A
0.65A
SW -28V
Active High
3
PROT_OVP
C
To Deflection Side
Power Supply Shut
Down Diagram
SW+ 28V
10
11
11
18
17
CP39
+115V
2
DP34
14
3
CP45
CP46
+7V
2
DP32
14
3
CP36
DP48DP49
0.39 Ohm
+115V Over Current
Detection
QP04
RP34
RP36
QP05
RP35
0.19A
0.69A
EP02
2 Amp
RP38
DP39
RP39
DP40
SW + 7V
SW + 6.3V
LP37
GREEN L.E.D.
SW + 115V
0.85A
+115V Over Voltage
Detection
PAGE 01-09
DP-4X SIGNAL POWER SUPPLY SHUTDOWN CIRCUIT EXPLANATION
See the DP-4X Signal Power Supply Shutdown Circuit for details. This includes inputs (E) and (F).
There are a total of 20 individual Shutdown inputs to the Relay Inhibit transistor Q203 shown on the Signal
Power Supply Shutdown Circuit.
• There are 8 individual Shutdown detection circuits on the Signal Power Supply Circuit Diagram.
• There are a total of 5 individual Shutdown inputs from the Deflection PWB via PROT_OCP (active
Low). Input from the PPS1 connector pin 45
• There are a total of 7 shutdown inputs from PROT_OVP (active High) input from the PPS1 connector
pin 47.
SHUTDOWN INPUTS EXPLAINED:
Q204 and Q203 Relay Inhibit Activation. (SHUTDOWN) called COMMON ACTION CIRCUIT.
All Shutdown events will cause the main power relays to turn off. This action will stop all secondary power
supplies. The Low Voltage Signal Power Supply will Shutdown along with the Deflection Power Supply.
• Q203 CIRCUIT EXPLAINED:
• If any of the shutdown circuits activate, the base of Q203 will go High. This turns on Q203 and removes
the Power On Highs from PPS1 connector pins 9 (Power_Sig) and 11 (Power_Def) called Power_1 and
Power_3. With this, the main power supplies will STOP. Q204 operates as a “latch”. This prevents
Q203 from turning off if the shutdown signal disappears after shutdown.
POWER ON/OFF RELAYS RY101 and RY102:
RY101 Explained:
• The Relay RY101 supplies AC to the Signal Power Supply bridge rectifier DS201. When this relay en-
gages, the Signal Power Supply starts up and supplies the voltages mentioned below.
SIGNAL (Low Voltage) POWER SUPPLY:
• The Signal Power supply is centered around the Switching Transformer T201 and the driver IC, IP01.
• This power supply creates voltages that are Switched on when the Set is turned on.
1. 38.5V or 29V 2. +10.5V 3. +21V
4. SW-5.6V 5. +16V 6. SW +5.7V
• Other supplies are generated from these 6 main voltages.
RY102 Explained:
• The Relay RY102 supplies AC to the Deflection Power Supply bridge rectifier DP01. When this relay
engages, the Deflection Power Supply starts up and supplies the voltages mentioned below.
DEFLECTION (High Voltage) POWER SUPPLY:
• The Deflection Power supply is cente r ed arou nd the Switching Transf o r me r TP01 and the driver IC, IC201.
• This power supply creates voltages that are Switched on when the Set is turned on.
1. SW +115V 2. +220V 3. +28V
4. SW-28V 5. +7V 6. SW +6.3V
• Other supplies are generated from these 6 main voltages.
CIRCUITS ATTACHED TO THE BASE OF Q203:
This year, Hitachi is utilizing a three legged diode OR gate style of input device for feeding shutdown inputs
to the base of Q203. These diode OR gates and circuits attached are explained next.
(Continued on page 11)
PAGE 01-10
DP-4X SIGNAL POWER SUPPLY SHUTDOWN CIRCUIT EXPLANATION
(Continued from page 10)
D214 Left Hand Input Circuits:
The left hand input to
base inputs a re monitoring DC voltages for short s .
Q205 base input circuits.
•
•
The Emitter of
right hand i nput is
these voltages without fail. If either the
D214 Right Hand Input Circuit:
The right hand input to
over voltage condition. If this voltage rises too much, the zener will fire generating a high on its anode and
through
D217 input circuits.
•
D217 Left Hand Input:
1.
•
D217 Right Hand Input:
1.
D218 input circuits.
•
D218 Left Hand Input:
1.
•
D218 Right Hand Input:
1. This monitors the
D220 input circuits.
The anode of diode
input is monitoring the
inputs will be Low in nature. There are a total of 5 inputs fed to this pin described in the previous 9 pages.
• See references to (F) on the PROT_OVP and PROT_OCP SHUTDOWN DIAGRAM.
D115:
1. The left hand input monitors the 5.7V line for shorts.
2. The right hand input monitors the 35V line for shorts.
D116:
1. The left hand input monitors the 10.5V line for shorts.
2. The right hand input monitors the 3.3V line for shorts.
Q205
10.5V
to the
D214
ZD202
much, the zener will fire generating a high on its anode and through
Circuit
ZD203
much, the zener will fire generating a high on its anode and through
Circuit
ZD205
tive voltage fed through R241 will pull the cathode of zener diode
generating a high on its anode and through
total of 7 inputs fed to this pin described in the previous 9 pages. If this voltage goes high, the high
will be dir ected through
Common Action Circuit
. This monitors the DC voltage
.
. This monitors the DC voltage
.
. This monitors the DC voltage -
• See references to (E) on the PROT_OVP and PROT_OCP SHUTDOWN DIAGRAM.
D220
is connected to the collector of
D214
pull up voltage is supplied through
. This assures the emitter voltage is always present and allows
or the
10.5V
is connected to the anode of
D214
.
5.7V
10.5V
5.6V
PROT_OVP
is connected to the collector of
PROT_OCP
inputs also labeled as
to the
D218
inputs also identified as
Common Action Circuit
D213
3.3V
for an over voltage condition. If this voltage rises too
for an over voltage condition. If this voltage rises too
for a loss or short. If this voltage disappears, the posi-
D218
Q206
. This transistor works as an inverter. Its
Q205
. The left hand input to
line is shorted, this transistor will still function.
. This monitors the DC voltage 3.3V for an
ZD204
D217
D217
ZD205
to the
Common Action Circuit
to the connector
(E)
.
. This transistor works a s a n inverter. Its base
from the connector
(F)
is
D213
Q205
to the
Common Action
to the
Common Action
high. The zener will fire
.
pin 47. There are a
PPS1
pin 45. These
PPS1
and the
5.7V
to monitor
PAGE 01-11
DP-4X SIGNAL POWER SUPPLY SHUTDOWN CIRCUIT
Power 1
Power 3
Power 2
PPS1
EF
PROT_OVPPROT_OCP
For
Signal
Power
Supply
DS201
Relay
Driver
For
Deflection
Power
Supply
DP01
AC
Q101
AC
SBY +5V
RY101
SBY +5V
RY102
D104
D109
R118
D105
R110
D110
9
onoff
D111
R122
11
R125R120
5.7V
12
R126
R236
Q104
35V 3.3V
RY105
SBY +5V
10.5V
Q206
C232
R238
45 47
5
Active Low Active High
D219
R237
R239
7
D213 D115 D116
ZD206
C237
R224
R235
-5.6V
R240
Q205
R233
ZD204
ZD202
R241
ZD203
ZD205
PAGE 01-12
Relay
Driver
Q102
R121
R230
Q203
C235
C238
Q204
R231
R232
D214 D217 D218
20
D220
5825
DP-4X STAND BY +5V POWER SUPPLY GENERATION EXPLANATION
STAND-BY +5V POWER SUPPLY GENERATION EXPLANATION:
The Stand By power supply operates anytime the set is plugged into an AC outlet. Shown
below in Figure 1 is the Stand By power supply.
a self contained Oscillator, Driver IC. It switches the primary of
The secondary of
the voltage is clamped by
T101
produces the SBY +5V via the rectifier
ZD101
.
A feedback to
IC101
is supplied by the photo coupler
IC102
•
IC102
works as a variable resistor attached to the cathode of the internal LED inside
. As the
SBY +5V
changes so will the resistance of
tance goes Down. As the Resistance goes down the Light emitted from the LED will increase. As the Light increases from the LED, the receiver will conduct more heavily.
This decreases the voltage fed back to
to reduce the primary switching of
IC101
T101
IC101
is the Driver IC for this supply. It’s
T101
.
D103
and filter
PC102
for regulation purposes.
IC102
. Voltage Up, Resis-
causing the internal circuits within
and reduce the
SBY 5.7V
line back to normal.
C106
. Then
IC101
L102
F103
DS101
-+
C105
IC101
D102
C110C107
C106R110
T101
PC102
IC102
D103
C106
R112
SBY +5V
ZD101
R111
R113
C109
R114
R115
Figure 1
PAGE 01-13
DP-4X POWER SUPPLY RELAY CONTROL EXPLANATION
See The DP-4X Stand By +5.7V Generation Circuit Explanation for details.
See The DP-4X Power On and Off Circuit Diagram for details.
Power Supply On and Off Circuit Explanation:
The DP-4X Chassis utilizes 5 relays.
RY101
1.
RY102
2.
RY103
3.
RY104
4.
RY105
5.
RY104
(4)
Starting with
supplies AC to the Bridge Rectifiers for the Signal and Deflection Power Supplies.
When The Stand By Power Supply develops the
voltage is delivered to the primary windings of
RY104
RY101
(1)
When the set is turned on, the
croprocessor
high is sent to
From here this high goes to the Deflection PWB through
Q101
of
coil inside
DS201
fier
RY102
(2)
When the set is turned on, the
croprocessor
high is sent to
From here this high goes to the Deflection PWB through
Q102
of
turn for the coil inside
Then to the Deflection Power Supply rectifier
gins to operate.
RY103
(3)
When the set is turned on, the
croprocessor
labeled
Base of
ground return for the coil inside
connector
on to the Audio Output IC
AC Supply to the Signal Power Supply Relay
AC Supply to the Deflection Power Supply Relay
DC Supply to the Audio Output Relay
AC Supply to all AC Relays Relay
DC (SW +5.7V) Supply to the Low Voltage Regulators Relay
AC Supply to all AC Relays Relay
RY104
. This turns on the relay and supplies AC to the above mentioned circuits.
AC Supply to the Signal Power Supply Relay
I004
Q018
goes high and the transistor turns on. This action supplies a ground return for the
RY101
and the Signal Power Supply begins to operate.
AC Supply to the Deflection Power Supply Relay
I004
Q023
. The base goes high and the transistor turns on. This action supplies a ground re-
DC Supply to the Audio Output Relay
I004
POWER 2
Q103
. The Base goes high and the transistor turns on. This action supplies a
PPS1
because this Relay supplies AC to
POWER SIG
. (This high also turns on the Power LED on the front of the set). This
Q021
and
and the relay turns on supplying AC to the Signal Power Supply recti-
. (This high also turns on the Power LED on the front of the set). This
and
RY102
. This high is sent to
. From here this high goes to the Deflection PWB through
pins 1,
2
then to the
POWER DEF
Q024
then to the
and the relay turns on supplying AC to the connector
POWER DM
RY103
and 3. Then to the Signal PWB and
IA02
.
SBY +5V
RY104
command is supplied from pin 59 of the Mi-
PPS1
connector pin 9 labeled
command is supplied from pin 58 of the Mi-
PPS1
connector pin
DP01
command is supplied from pin 91 of the Mi-
Q028
and the relay turns on supplying Audio B+ to the
and
Q029
(Page 01-16)
RY101
and to the relay driver Q105 for
R120, R110, D109
R125, R122, D110
and the Deflection Power Supply be-
then to the
and
, (see previous page) this DC
11
(Previous Page)
RY102
labeled
PPS1
Continued on Next Page
which in turn
POWER 1
to the Base
POWER 3
to the Base
connector pin
R124
.
.
PC2.
to the
12
PAGE 01-14
DP-4X POWER SUPPLY RELAY CONTROL EXPLANATION
Continued from Previous Page
See The DP-4X Power On and Off Circuit Diagram for details. (Page 01-16)
RY105
(5)
DC (SW +5.7V) Supply to the Low Voltage Regulators Relay
When the set is turned on, the
Microprocessor
I004
. This high is sent to
pin 12. From here this high goes to the Deflection PWB through
Q104
. The Base goes high and the transistor turns on. This action supplies a ground
return for the coil inside
nector
PPS1
pins 25,
26
POWER DM
RY105
27.
and
command is supplied from pin
Q028
and
Q029
then to the
R126
and the relay turns on supplying
SW 5.7V
Then to the Signal PWB and on to the following Low
Voltage Regulators and ICs.
•
SIGNAL 5 of 5 DIAGRAM (AV Selector).
IY01 +
◊
IY02 +
◊
IY08
◊
•
SIGNAL 4 of 5 DIAGRAM (3D Y/C)
IV01 +
◊
•
SIGNAL 1 of 5 DIAGRAM (Micro).
I010
◊
I013
◊
I006
◊
I008
◊
3.3V Regulator.
5V Regulator.
SW +5V Regulator.
2.5V Regulator.
Bus Select Switch.
+3.3V Regulator.
AV Control IC
IR Blaster Select Switch.
91
of the
PPS1
connector
to the Base of
to the con-
PAGE 01-15
DP-4X POWER ON and OFF CIRCUIT DIAGRAM
Audio 38.5V or 29V
SW +5.7V
For Signal
Power Supply
AC
Relay
Driver
SBY +5V
AC to
DS201
Q101
RY101
PPS1
D104
D109
R118
R120
R110
9
onoff
POWER 1
For Deflection
Power Supply
AC
Driver
Relay
AC to
PC2
Q102
RY102
R125
11
38V
531
12
POWER 3 POWER 2
RY103
For
D105
D110
R121
R122
onoff
Audio
Outputs
Q103
Relay
Driver
D106
R124
R123
R126
R127
28 27 25
5.7V
RY105
D108
5.7V38V
Q104
Relay
Driver
Microprocessor
PAGE 01-16
POWER LED
I004
POWER SIG
POWER DM
POWER DEF
SW +10.5V
59
91
58
Signal PWB
Q018 Q021
Q028 Q029
Q023 Q024
QY63
QY62
PPS1
9
12
11
PDS3
10
POWER 1
POWER 2
POWER 3
Signal Power Supply PWB
ZD102
R126
R125
D107
RY104
For Signal and
Deflection Power
Supply
AC Relays.
AC
Q105
Relay
Driver
DP-4X POWER SUPPLY SW +115V REGULATION EXPLANATION
Hi-Voltage Power Supply Regulation Circuit Diagram explanation:
(See Power Supply SW+115V Regulation Circuit Diagram for details)
THIS POWER SUPPLY RUNS ONLY WHEN THE SET IS TURNED ON:
TURNING ON THE SW +115V POWER SUPPLY
RY102 AC Supply to the Deflection Power Supply Relay
When the set is turned on, the POWER DEF command is supplied from pin 58 of the Microprocessor I004.
(This high also turns on the Power LED on the front of the set). This high is sent to Q023 and Q024 then to the
PPS1 connector pin 11 labeled POWER 3. From here this high goes to the Deflection PWB through R125,
R122, D110 to the Base of Q102. The base goes high and the transistor turns on. This action supplies a ground
return for the coil inside RY102 and the relay turns on supplying AC to the connector PC2. Then to the Deflec-
tion Power Supply rectifier DP01 and the Deflection Power Supply begins to operate.
DP01 develops raw 300V via the doubler circuit comprised by CP03 and CP04. This voltage is routed through
FP01 to the Drain of QP01. A sample of this DC is routed through RP03 as Start Up voltage for IP01 at around
309V. From the Source of QP01 (when switched) the pulsed DC is routed to pin 9 of TP01. This voltage is
routed through the primary coil inside TP01 and out pins 7. One path from here is sent to pin 9 of IP01 which is
the Over Current Detection pin. The Ground return path for the primary voltage is routed through three 0.22 ohm
resistors R911, R912 and R913.
The Source of QP01 is also connected to the Drain of QP02. In this way, QP01 acts to connect raw B+ to the
primary of TP01 during the field build up period and QP02 acts as a ground switch during the collapse of the
primary field. QP01 gate control is via pin 16 of IP01.
After the Deflection Power Supply begins to operate, IP01 needs Run Voltage. This is accomplished by the pulse
from TP01 pin 5 being rectified by DP04, filtered by CP13 and the DC component arrives at pin 8 of IP01.
SW +115 REGULATION
SW +115V pulse is generated from pin 10 and 11 of T901. This pulse is rectified by DP34, filtered by CP45 and
then routed through the Excessive Current sensing circuit RP34 and QP05.
The primary route for the SW +115V is through EP02, LP37 and output as SW +115V to the Deflection and
High Voltage generation circuit.
However, the regulation route is to pin 1 of IP03. Internally, the regulator circuit works as a variable resistor
whose resistance is dependant upon the SW +115V voltage fluctuations. The internal variable resistor manipulates the current flow from pin 6 to pin 7 ground. This will cause the voltage at pin 2 of IP02 to be controlled.
Internally, the LED is illuminated by degrees dependant upon the SW +115V voltage fluctuations. The internal
receiver receives this light and acts as a variable resistor from pin 4 which is the regulation control signal to pin 3
hot ground.
This action causes pin 2 of IP01 to manipulate the internal oscillator within IP01. This in turn causes the timing
of the drive pulses delivered to the Gate of QP01 and QP02 SMOSFET (Switch Metal Oxide Semiconductor
Field Effect Transistor) to manipulate the frequency of the pulse generated on the primary of TP01. The current
drain of these SMOSFETs is monitored by three low ohm resistors mentioned above. If this current exceeds a
specific value, the voltage developed by these low ohm resistors is routed through RP14 ba ck into pin 9 of IP01
which is the Over Current Protection circuit. This pin will inhibit the drive signal to the ga te of the SMO SFETs.
As soon as the excessive current situation is eliminated, the IC will recover and continue functioning.
B+ GENERATION FOR THE POWER SUPPLY DRIVER IC:
Vcc for the Driver IC is first generated by the AC input. This voltage is called Start Up Voltage. IP01 requires
23.3V DC to operate normal. However, it will begin operation at a much smaller voltage on pin 18.
When AC is applied to the main full wave bridge rectifier DP01 where it is converted to Raw 300V DC voltage,
voltage doubler filter CP03 and CP04, routed through RP03 and made available to pin 18 of IP01 as start up
voltage. This voltage climbs to 300Vdc and the internal Regulator of IP01 is turned On and begins operation.
When the power supply begins to operate, the magnet field collapses and the EMF is coupled over to the secondary windings, as well as the drive windings. The drive windings at pin (5) produce a run voltage pulse of around
43 V p/p which is rectified by DP04, filtered by CP13 and becomes run voltage (20.3V) for IP01 pin 8.
: (See Relay Controls on previous page).
QP02 gate control is via pin 12 of IP01.
PAGE 01-17
PPD3
AC
DP-4X CHASSIS POWER SUPPLY SW +115V REGULATION CIRCUIT DIAGRAM
Deflection Power Supply
From Relay RY102
13
AC Ground Side
-
CP03
4
-
3
2
+
1
+
CP04
+
-
Hot
Ground
DP01
FP01
Start Up
4Amp
RP03
D
QP01
G
S
DP02
S
D
G
QP02
TP01
9
TP01
5
3
Floating Ground
Pin 12, 14, 15, 16
All 58.5Khz
14
162V
309V
18
155V
16
4.87V
12
151V
15
0V
9
43.3Vp/p 42.5Vp/p
Primary
RP16
1 of 2
Run
1.83V
2
F/B
20.3V
8
Vc1
VD
P Gnd511
VG (H)
Gnd
VG (L)
VS
OCP
0V
0V
1 2.53V
3 2.27V
4
2.52V
6 4.46V
DP04
RP19
CP13
B+ 115V
58.5Khz
Regulator
Photocoupler
IP02
4
FB
3
IP03
1 6
7 19V
RP14
IP01
Driver IC
10
10.3V
SW +7V
RP30
1
RP31
2
RP32
CP47
7
CP07
Primary
2 of 2
TP01
11
10
CP45
DP34
QP05
15
Secondary
3 of 3
PROT_OVP
See PROT_OVP,
PROT_OCP Shut Down Diagram
R911, 12, 13
CP46
0.22 Ohm
RP34
0.39 Ohm
DP36
DP37
DP38
RP36
CP20
2 Amp
RP35
DP39
EP02
RP38
RP39
DP40
Regulator
LP37
Deflection
B+ 115V
5
7
CP48
0.85A
Hot Ground from pin 4 of
Bridge Rectifier DP01
Cold Ground from
pin 15 of TP01
DP35
SW +115V
PAGE 01-18
V
4
DP-4X CHASSIS IP01 VOLTAGES AND WAVEFORMS
PAGE 01-18A
Pin
1 2.53V
2 1.83V
3 2.27V 2.76V P/P
4 2.52V
50V
6 4.46V
7 19V
8 20.3V
90V
10 10.39V
11 0V
12 4.87V 12.6V p/p 58.5Khz
13 0V
oltage Waveform
14 162V 314V p/p 58.5Khz
15 151V 308V p/p 58.5Khz
16 155V 317V p/p 58.5Khz
17 0V
18 309V
TP01
Pin 5 45.3V p/p 58.5Khz
Anode DP0
Anode 42.5V p/p 58.5Khz
DP-4X SIGNAL POWER SUPPLY 5.7V REGULATION EXPLANATION
5.7V Power Supply Regulation Circuit Diagram explanation:
(See Signal Power Supply 5.7V Regulation Circuit Diagram for details)
THIS POWER SUPPLY RUNS ONLY WHEN THE POWER 1 COMMAND IS ACTIVE HIGH:
TURNING ON THE 5.7V POWER SUPPLY
directs AC to the Low Voltage Power Supply.
RY101
When the set is turned on, the
high is sent to
through
supplies a ground return for the coil inside
nal Power Supply rectifier
DS201
Q201
As the current draw across
IC201
until the over voltage condition disappears.
After the Signal Power Supply begins to operate,
from
5.7V REGULATION
5.7V pulse is generated from on the secondary of
C229
The primary route for the
However, the regulation route is to the cathode of
whose resistance is dependant upon the
flow from pin 2 of
tuations which causes the resistance of
variable resistor from pin 4 to pin 3, which is the regulation control signal to pin 2 labeled as
This action causes pin 2 of
ing of the drive pulses delivered to the Gate of
fect Transistor) to manipulate the frequency of the pulse generated on the primary of
these SMOSFETs is monitored by the low ohm resistor
value, the voltage developed by this low ohm resistor is routed through
the Over Current Protection circuit. This pin will inhibit the drive signal to the gate of the SMOSFETs. As soon
as the excessive current situation is eliminated, the IC will recover and continue functioning.
B+ GENERATION FOR THE POWER SUPPLY DRIVER IC201:
Vcc for the Driver IC is first generated by the AC input. This voltage is called
23.3V
When AC is applied to the main full wave bridge rectifier
filtered by
up voltage. When this voltage reaches 12Vdc, the internal Regulator of
When the power supply begins to operate, the magnet field collapses and the EMF is coupled over to the secondary windings, as well as the drive windings. One drive winding produces a run voltage pulse which is rectified
by
R110
develops raw 150V which is routed through
(when switched) the primary of
which is the Over Current Detection pin. If this voltage goes too high, the power supply will shut down
which is rectified by
T201
.
DC to operate normal. However, it will begin operation at a much smaller voltage on pin 6.
C201
, filtered by
D204
and
Q018
and then
PC201
and
C202
C206
POWER SIG
then to the
Q021
to the Base of
D109
and the Signal Power Supply begins to operate.
DS201
T201
rises and falls due to the load, the developed DC Voltage is sent to pin 3 of
R204
, filtered by
D204
is through
5.7V
5.7V
. Internally, the LED is illuminated by degrees dependant upon the
IC203
to manipulate the internal oscillator within
IC201
, routed through
and becomes run voltage (
(See Power On/Off Circuit Diagram).
:
command is supplied from pin 59 of the Microprocessor
connector pin 9 labeled
PPS1
. The base goes high and the transistor turns on. This action
Q101
and the relay turns on supplying AC through
RY101
primary to the Drain of
T201
is grounded through a 0.1 low ohm resistors
gate control is via pin 5 of
Q201
needs
IC201
and the DC component arrives at pin 6 of
C206
. This pulse is rectified by
T201
and output as
L204
. This regulator circuit works as a variable resistor
IC203
voltage fluctuations. This variable resistor manipulates the current
to fluctuate. The internal receiver receives this light and acts as a
SMOSFET (Switch Metal Oxide Semiconductor Field Ef-
Q201
R204
R202, R203
and
23.3V
I004
POWER 1
Run Voltage
DM 5.6V
mentioned above. If this current exceeds a specific
where it is converted to Raw 150V DC voltage,
DS201
and made available to pin 6 of
R210
) for
IC201
. This is accomplished by the pulse
to the Digital Module.
R213
IC201
pin 6.
. From here this high goes
to the Sig-
F102
. From the Source of
Q201
.
R204
.
IC201
.
IC201
, filtered by
D210
. This in turn causes the tim-
IC201
. The current drain of
T201
back into pin 3 of
Start Up Voltage
is turned On and begins operation.
voltage fluc-
5.7V
.
F/B
IC201
.
IC201
IC201
C228
which is
requires
as start
. This
and
PAGE 01-19
DP-4X CHASSIS SIGNAL POWER SUPPLY 5.7V REGULATION CIRCUIT DIAGRAM
AC
Relay RY101
AC
Gnd
Side
-
F102
6 Amp
-
C202
Hot
C203
+
-
C201
+
Ground
Start Up
R209
C208
+
DS201
R208 R210
T201
6
1
Primary
1 of 2
IC201
Vcc
CS
F/B
Gnd
Out
FB202
2
4
5
D204
Run
R207
C206
T201
C212
D210
C228
FB
4
3
DM 5.6V
5.7V
C229
PC201
Regulator
Photocoupler
L204
R223
R225
1
R222
2
R226
R203
T201
Primary
2 of 2
C214
R213
D201
D202
3
OCP
D
S
C211
Q201
G
R204
0.1 Ohm
D203
R205
R206
ZD201
R224
C234
IC203
Regulator
R227
Hot Ground from pin 4 of
Bridge Rectifier DP01
Cold Ground from
pin 15 of TP01
PAGE 01-20
DP-4X LED (Visual Trouble Detection) CIRCUIT EXPLANATION
This explains the LEDs used in the Deflection Power Supply used for Visual Trouble Shooting Circuit Diagram explanation:
(See the LED (Visual Troubleshooting) for the Deflection Power Supply Diagram on the next page for details)
2 GREEN LEDS
In the DP-4X chassis, there are 2 Green LEDs that can be used for Visual Trouble shooting. The Service Technician can use these LEDs to determine if the set is experiencing a problem within these two Power Supplies..
The LEDs can be used in the following ways.
OFF:
If the LED is off, then the power supply that is being monitored is unavailable. (Excluding the possibility that the LED itself is malfunctioning). NOTE: If
condition because of its current flow explained below.
If the LED turns on but then quickly goes off before the others, then the power supply that is being
monitored can be suspected.
ON:
If the LED is on, then the power supply that is being monitored is working normal. (There is the possibility that the power supply being monitored may in fact be present but low. If after making visual inspection and all seems OK, but there’s still a problem, be sure to check the accuracy of the power supply
in question.
GREEN LEDs DP50 and DP40.
DP50 (SW + & - 28V)
• Monitors the SW +28V output from
• Note: This LED requires the SW –28V power supply to be functioning to operate. Current flow for light-
ing DP50 is from the SW+28V through RP46, DP50, RP47 to the SW-28V. If the LED opens, or the
negative SW –28V is missing, this LED will not illuminate. If the SW –28V is missing, the set will shut
down.
DP40 (SW +115V)
• Monitors the
• This power supply is used for Deflection and High Voltage generation.
NOTE: Both of the Green LEDs are also involved in the Shut Down Circuit.
•
DP50
cause the zener to fire and supply a high through
(See the Deflection Power Supply Shutdown Output Diagram Explanation Page 01-08 for details).
•
DP40
turn are connected to the
the zener will fire and supply a high to the
(See the Deflection Power Supply Shutdown Output Diagram Explanation Page 01-08 for details).
There are additional components in the Shut Down circuit that are not shown in this diagram. Please see the Deflection Power Supply Shutdown Output Diagram Explanation Page 01-08 for details.
LED opens, then the set will be in shut down
DP40
pin 16 and rectifier
TP01
SW +115V
supplies
supplies the Ground return path for the Voltage divider comprised of
SW+28V
output from
to the Cathode of
SW +115V
pins 10 and 11. Rectified by
TP01
if the negative
DP46
to the
DP47
deflection B+. If the voltage on the cathode of
PROT_OVP
shut down Circuit.
. Filtered by
DP30
DP34
SW-28V
PROT_OVP
is missing. This action will
and
CP32
, filtered by
shut down Circuit.
and
RP38
DP39
CP34
CP45
. These in
RP39
goes too high,
.
.
PAGE 01-21
TP01
DP-4X CHASSIS
L.E.D. (Visual Troubleshooting) for the Deflection Power Supply
2 Total L.E.D. for visual trouble sensing observation.
+28V
-28V
16
15
14
10
11
11
DP30
CP30
CP32
CP33
DP31
CP31
LP30
+
+
2
3
+
+
LP31
+115V
DP34
14
QP05
CP45
CP46
CP34
CP35
LP33
RP46
DP50
RP47
+115V Over
Current
RP34
0.39 Ohm
GREEN L.E.D.
SW-28V Loss Detection
RP35
+ & - SW 28V Active (LED)
DP46 DP47
LP34
See the Deflection Power Supply Shut
EP02
2 Amp
RP38
DP39
1.26A
0.65A
PROT_OVP
Down Circuit Diagram for details.
LP37
RP39
0.85A
+115V Over
Voltage
SW+ 28V
SW -28V
SW + 115V
SW +115V Active (LED)
DP40
GREEN L.E.D.
There are additional components within the Shut Down Circuit not shown here.
Please see the Deflection Power Supply Shut Down Output Circuit Diagram on Page 01-09 for details.
PAGE 01-22
DP-4X BLANK PAGE “NOTES”
BLANK PAGE
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