NEC JC-1531 VMA-2 Service Manual Download Page 39

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(e)

Error detection amplifier circuit

The output voltage 80V is divided by the network resistors. This divided voltage is compared to the reference

voltage at the error amplifier lC651. An error signal is applied to the control circuit via the photocoupler PC601.

R655

C653

A R R654

VR651

R654

GND

(Fig l-l-5) Error Detection Amplifier Circuit

(f)

Oscillating and control circuit

The oscillating, control, and drive circuits are contained in IC601.

IC601 has a built-in oscillator whose frequency is determined by R608, and C605 connected to pin

and pin

respectively.

The output of the error detection amplifier circuit is fed back to the control circuit pin

from pin

PC601 to

control the duty cycle of Q601 so that output voltages are kept constant.

R608

R612

I C601

(Fig l-l-6) Oscillating and Control Circuits

Summary of Contents for JC-1531 VMA-2

Page 1: ...pp Positive Display Colors Analog Input Unlimited colors Depends on the graphics Board Synchronization Horizontal 27 kHz to 62 kHz Automatically Vertical 55 Hz to 90 Hz Automatically Resolution Horizontal 1024 dots Vertical 768 dots non interlaced Video Band Width 80 MHz Active Display Area Horizontal 260 mm Active display area is changed Vertical 195 mm by signal timing Active Display Area Horizo...

Page 2: ...djust the monitor to the video card s scanning frequency thus displaying the resolution you require The MultiSync 4FGe also supports multiple operating platforms including IBM compatible and Macintosh family systems Increased resolution adds to the image clarity and the MultiSync 4FGe monitor provides a wider range of higher resolution to meet your needs for now and in the future A wide Range of G...

Page 3: ... Power Switch Brightness Control Contrast Control Color Switch Sync Switch H Size Increase H Size Decrease H Position Left H Position right V Size Increase V Size Decrease V Position Up V Position Down Memory Recall Button Mode Status LED Degauss Switch 6 Input Signal Terminal Mini D SUB 15P Connector MALE D SUB 15P Connector MALE See page 3 for Pin Assignments Table 2 ...

Page 4: ...ini D Sub 15P D SUB 15P 1 RED GROUND 2 GREEN RED 3 BLUE H V COMP SYNC 4 GROUND GROUND 5 SELF TEST GREEN 6 GROUND GROUND _ 7 GROUND NC 8 GROUND N C 9 N C BLUE 10 GROUND NC 11 GROUND GROUND 12 RESERVED NC __ 13 H SYNC GROUND 14 V SYNC GROUND __ 15 N C N C MINI D SUB 15P D SUB 15P 3 ...

Page 5: ...Timing Charts Separate Sync Vertical I H t J Composite Sync Horizontal F A 1 Vertical uulr _________ G w 4 ...

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Page 7: ... face down as shown Top VIEW Remove the screw a with washer then remove the revolving stand from the display Move the revolving stand so that the FRONT mark is aligned with the cabinet side The removable parts consist of a dis play revolving stand spindle revolv ing and screw a with washer as shown I Revolving stand ...

Page 8: ...d Remove the three screws b Remove the CABINET BACK 3 Place the monitor on its base as shown Remove the four screws c from the case shielding CRT and remove the case shielding CRT 4 ew c Remove the four screws c and re move the four screws d from the case shielding BACK Remove the case shielding BACK and case shielding TOP ...

Page 9: ...emove the VIDEO PWB ASSY with VIDEO BRACKET Screw c Screw e 6 Remove the four screws c Remove the two screws f Remove the screw k Remove the BRACKET L Screw f Screw e BRACKET L Screw k Screw c S c rew f 7 Disconnect the connectors CN SW CN Z CN D C and CN K from the SW REG UNIT Remove the screw f Remove the screw k Remove the two screws d Remove the SW REG BRACKET R ASSY with SW REG UNIT Screw k 8...

Page 10: ...t the connectors CN E CN F CN VDY CN HDY and CN K NOTE Carefully discharge the CRT anode cap by shorting it to ground before removing the anode cap 9 Remove the three screws g Remove the MAIN PWB ASSY Screw e Screw g BRACKET BOTTOM 10 Screw k Screw i Remove the three screws k Remove the screw e Remove the screw i Remove the BRACKET BOTTOM ...

Page 11: ...e Revolving Cabinet Bottom Power Line Filter Signal Cable SW REG UNIT DISASSEMBLY CN K Cf fD C CN Z CN S 1 2 Disconnect the connectors TN K CN Z CN D C and CN SW Remove the two screws e and lift up the SW REG UNIT Screw e 1 0 ...

Page 12: ... L PWB ASSY BOARDS MAIN PWB ASSY PWE 365 VIDEO PWB ASSY PWE 315A CRT PWB ASSY PWE 3158 CONTROL PWB ASSY PWE 318 SW REG UNIT VMA SMP 120BB SW REG UNIT VMB R B EE SMP 12088 l UNIT PWB ASSY H OSC UNIT PWE 366A UNIT PWB ASSY DISTORTION UNIT PWE 366B UNIT 2 HV PROTECTOR CRT PWB ASSY S W REG UNIT UNIT2 HV PROTECTOR On the MAIN PWB ASSY 11 ...

Page 13: ...CONNECTORS CN D CN V DY CN K MAIN PWB ASSY PWE 365 CN F CN E CONTROL PWB ASSY PWE 318 12 CN E CN H DY FBT ...

Page 14: ...CN A CN C CN J CN L CN I VIDEO PWB ASSY PWE 315A CN R CN G I CN B CN HC CN CE CN M CRT PWB ASSY PWE3158 13 ...

Page 15: ...SW REG PWB ASSY VMA CN SW CN Z CN D C CN K SW REG PWB ASSY VMB R B EE 14 ...

Page 16: ...Y RECALL 10 N C 2 AUTO ADJUSTMENT PULSE OUT 11 CONTROL DOWN CONTROL SELECT O H S 12 USER LEVEL ID TEST POINT TP 3 13 CONTROL UP 5 CONTROL SELECT l H P 14 COLOR N TEST POINT TP 2 15 5v CONTROL SELECT 2 V V S 16 COLOR 1 8 TEST POINT TP 1 17 GND 9 CONTROL SELECT 3 V P 18 COLOR 2 Ill09 8 7 6 5 4 3 2 1 TP A 0 0 0 0 0 0 0 0 0 0 0 PIN NO TEST POINT TP 1 TEST POINT TP 2 7 H V PROTECTOR 10 8 H V PROTECTOR ...

Page 17: ... BIAS 0 VR707 R SUB BRIGHT 0 V R 7 0 5 G B I A S VR706 B BIAS VR701 R GAIN 0 n VR702 G GAIN VR703 B GAIN V I D E O PWB ASSY PWE 315A TP903 B TP901 R TP905 GND a 0 0 TP902 G l TP904 SCREEN C R T P W B ASSY PWE 315B 16 ...

Page 18: ...ADJ Mechanical center Heater Voltage Adjustment a Receive character H Signal 9 1024X768 70 b Supply 24V to the MAIN PWB c Adjust VR551 so that the voltage across HC and is 6 1V O O5V H V Adjustment Signal 11 42 5kHz a b c d e f g h Connect CNP HV Turn VR505 H V ADJ VR fully counterclockwise Receive crosshatched pattern and adjust VR501 H HOLD 1 and VR502 H HOLD 2 to sychronize the screen Brightnes...

Page 19: ... user level to level 1 Changing the user level To LEVEL 1 Simultaneously press DEGALlSS SW110 and V POS UP SW107 To LEVEL 2 Simultaneously press DEGAUSS SW110 and H POS RIGHT SW103 To LEVEL 3 Simultaneously press DEGAUSS SW110 and V POS DOWN SW108 User switch functions a LEVEL 1 POSITION SIZE V SIZE UP v POSI U P I H POSI L E F T 0 H SLHT I 0 I I I 0 MEMORY H SIZE RECALL D O W N 1 H S I Z E UP 0 M...

Page 20: ... limits space between bezel and raster right and left space difference 2 m m Vertical Linearity Signal 6 800x600 56 Perform this procedure only necessary If needed a Receive a crosshatch pattern b Adjust VR401 V SUB HEIGHT so that the vertical screen size is approximately 195mm c Adjust VR402 V LIN to obtain the best vertical linearity Vertical Sub Height Signal 1 VGA350 a Receive a crosshatch pat...

Page 21: ...al 6 800x600 56 a Receive a crosshatch pattern with outside border b If the vertical lines at left and right edges of the screen are not straight Adjust VR403 again 9 Horizontal Width Signal 12 EVGA480 a Receive a crosshatch pattern b i dbrightness control so that the raster is faintly C Adjust the H POS SWITCHES SW103 104 to center the horizontal screen position in the raster if needed decrease t...

Page 22: ...A and 0 Adjust the screen position and size to within the limits listed above using the user control switches SWlOl 108 Push MEMORY RECALL SWITCH SW109 for at least 2 seconds If more than one signal requires readjustment repeat steps b I through e Release the short 10 2 Side Pincushion Signal 1 6 7 9 Repeat the following procedure for each of the 4 signa a Receive a crosshatch pattern b Check to i...

Page 23: ...13 VGA480 WINDOW b Turn the contrast control fully clockwise c Adjust VR854 so that the voltage across TP41 on Adjustment jig TP B I and 0 is 3 OOV O O3V ll 4 Gain adjustment a Receive the window pattern signal 13 VGA480 WINDOW b Turn the contrast control fully clockwise Turn the brightness control fully counterclockwise c Adjust VR7Ol R VR702 G VR703 B so that the terminals TP9Ol R TP902 G and TP...

Page 24: ...ight with same brightness as the reference color lf even it the reference color will not appear VR710 turned fully clockwise turn VR705 clockwise unitil the green horizontal display appears faintly Use as the reference color Next turn VR704 and VR706 until their corresponding colors light with the same brightness as the reference color g Open the short SW45 on Adjustment jig TP B between and 0 NOT...

Page 25: ...osition N leftmost position Receive signal 13 Short CN TP I and Use CN TP on Adjustment jig Switch to level 2 and confirm that the LED lights Short SW42 on Adjustment jig TP A and 0 Use the user controls to adjust the color temperature to x 0 300 O 003 Y O 305 0 003 Push MEMORY RECALL SWITCH SW109 for at least 2 seconds Release the short CN TP I and 0 Receive an all black signal of signal 3 Turn t...

Page 26: ... e p o s i t i v e The sync polarity can also be negative 14 27kHz 55 SEPARATE p o s i t i v e negat i ve Fh 27kHz FV 55kHz 15 62kHz 90 SEPARATE negative p o s i t i v e Fh 62kHz FV 90kHz 1 When SYNC On GREEN output simultaneously output a COMPOSITE SYNC signal to the H SYNC line V SYNC connect to ground COMPOSITE SYNC polarity is NEG NEG SERRATION is ON IH 2 Video H o r i z o n t a l s i z e 1 8 ...

Page 27: ...P A TP B SW46 TP A 89 T P B 0 O sw44 T P B O 8 SHORT t OPEN TP43 TP A 8 ov a 0 GND TP 3 SW41 SW42 SW43 This part is used for 4FG and 4FGe TP B TP41 0 T 42 Gnd 1 0 1 2 85v 2 0 No V WY i 0 open H bl 0 Faint Ad just I s5 0 For 4FG 4FGe A d j u s t m e n t j i g S c h e m a t i c D i a g r a m 26 ...

Page 28: ...form the adjustment by opening the angle between the tabs __ i_ 1 I Perform the adjustment by synchronous rotation of the two tabs B RG Perform the adjustment by synchronous rotation of the IWO t a b s 1 Perform the adjustmenl by opening the angle between the tabs Red to Blue Convergence Green to Magenta Convergence Magenta White Convergence Adjustment 1 2 3 4 5 6 7 Produce a magenta crosshatch on...

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Page 33: ...__ __ _ __ _ _ _ A _ _ _ _ _ _ T _ I 101 i 74 i 72 91 i 55 100 _ ___ _ _ _ _____ _ _ _ _ _ _ __ _ _4 _ _ _ _ 4 _ _ _ 79 i 57 i 52 70 f 43 80 _ __ _ _ _ _ _ _ ai i ____ __ _ __ _ _ _ _______ _ _ _ _ _ _ 1 _ 61 i 54 _ _ _ _ ____i__ _ _ _ _____ _ _ _ _ _ _ i _ _ _ _ _ _ i __ _ 77 i 44 i a2 7 j ___ ____ ____ _ _ _ _ i_ _ _ _ ___ ___ _ _ ___ __ _ _ _ _ _ _ _ _ _ _ _ 9 ___ _ _ _ _t_ _ _ _ _ _ i _ _ 4 i ...

Page 34: ..._ ___ _ _ ___ _ __ _ _ _ _ _ _ _ _I I _ _ _ __ _ _ __ _ _ __ _ _ _vs 94 i 100 i 104 i 62 I I _ _ _ i _ __ __ i ___ _ _ _ _ i _ _ _ I _ _ _ __ _ _ _ ___ _ __ __ i __ _ _ __ I 77 i 58 83 i 50 I _ _ I f __ _ _ _ ___ ____ e _ _ 1 I _ _ ___ ___ ___ j __ _ _ _ j _ ___ _ _ __ J 10 i 10 j 12 I 10 __ _ _ _ _ __ _ _ 607 524 i 520 i 689 _ i _ _ 8 _ 8 __ 1 55 1 18 40 62 _ _ _ _ I _ _ _ A _ 6 2 3 6 _____ ___ _...

Page 35: ... Interface circuit 49 2 l Sync Interface Circuit 49 2 2 Sync switch and Video Clamp pulse Circuit 50 2 3 Self Test Circuit 51 3 Video System 52 3 l Video Signal Amplifier 52 3 2 Brightness and cut off circuit 53 3 3 Video Mute and Video Blanking Circuit 54 3 4 ABL Circuit 54 4 Digital Control System 55 4 l Digital Control Circuit 55 5 Deflection System 59 5 l Horizontal System 59 5 1 l H synchroni...

Page 36: ... 24V L Fig l l BLOCK DIAGRAM of the 4FGe s Power Supply BRIGHTNESS AND CUT OFF CONTROL SUB BIAS CONTROL VIDEO OUTPUT AMPLIFIER D A STARTUP CIRCUITS AND BRIGHTNESS CONTRAST CONTROL D A and OP AMP IC SUPPLY VOLTAGE HORIZONTAL OSCILLATION UNIT and POWER INDICATOR LED s VIDEO BOARD OP AMP SUPPLY VIDEO PRE AMPLIFIER SUPPLY and VERTICAL DEFLECTION OUTPUT SUPPLY CRT HEATER and LOW B PROTECTOR VOLTAGE CPU...

Page 37: ...liary power supply circuit is needed to activate IC601 At the time when the power is turned on the charging current flows into the capacitors C603 via R601 Oscillation starts when the voltage of IC601 pin reaches 16V by this charging operation After the start of oscillation the flyback voltage of the auxiliary winding for the switching transformer is rectified and filtered by D608 and C603 The res...

Page 38: ...age is applied to the primary winding of T601 FILTERING T601 CIRCUIT C602 f R602 From IC601 Pin _ DRIVE CIRCUIT Fig l 1 3 Converter Circuit d Output rectifying circuit The flyback voltages generated at the secondary windings of the switching transformer T601 are rectified by D651 D681 and D691 Then these voltages are filtered by C692 C693 C651 C652 C656 C681 and C682 so that rectified DC voltages ...

Page 39: ...on Amplifier Circuit f Oscillating and control circuit The oscillating control and drive circuits are contained in IC601 IC601 has a built in oscillator whose frequency is determined by R608 and C605 connected to pin and pin J respectively The output of the error detection amplifier circuit is fed back to the control circuit pin from pin via PC601 to control the duty cycle of Q601 so that output v...

Page 40: ... D608 T601 Fig 2 l 7 Over Voltage Protection h Auto and Manual Degaussing circuit 1 2 Auto Degaussing Circuit When the unit is turned ON The 24V DC output at k3 rises This will cause 0671 to turn ON The ON period for this transistor is determined by R673 ZD671 R674 and C671 approx 2 seconds When 0671 is ON current will flow through the Degaussing Coil Manual Degaussing Circuit When the Degauss Swi...

Page 41: ...converter circuit is composed of a step down chopper FET drive and control circuit This chopper circuit is composed of L507 D518 and C539 This circuit supplies DC voltage of 35 l 20V to FBT for H V regulation The relationship between output DC voltage of chopper circuit and horizontal frequency is shown in Fig l 2 6 The FET drive circuit is composed of the buffer circuit of Q520 0521 R571 and leve...

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Page 45: ... D507 and ZD503 The DC level of the output pulse from the control circuit pin of IC5A4 is shifted and is supplied to FET Q510 by this circuit Fig 1 3 2 The control circuit is a negative feedback circuit and supplies PWM Pulse Width Modulation pulse through FET drive circuit to FET Q510 The output pulse of T502 is clamped by C526 D510 and is rectified by D511 and C527 The value of this rectified vo...

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Page 48: ... raster centering power supply can be obtained As for 12V power supply it is obtained as below After adding the pulse induced between pin B 0 of T551 and the generated 6V it is rectified by D553 and C 5 6 1 Then the rectified voltage of 13V or a little more voltage is obtained 12V power supply is obtained from this voltage by using 12V 4 terminal regulator of lC552 As for lOV power supply it is ob...

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Page 50: ... S Y N C O N G vj S Y N C H SEPARATE H V COMPOSITE SHAPER I V SEPARATE Fig 2 l l BLOCK DIAGRAM of the SYNC INTERFACE CIRCUIT b The outputs of the distinction circuit are as follows These outputs are supplied to IC851 CPU on the main PWB l H SYNC signals s polarity CN A PIN 1 L POSITIVE POLARITY H NEGATIVE POLARITY l V SYNC signal s polarity CN A PIN 2 1 L POSITIVE POLARITY H NEGATIVE POLARITY V SY...

Page 51: ...sync If the Comp Sync and Sync on Green are input at the same time ex Macintosh II the Comp Sync is CUT by the Sync SW When Sync SW is OFF the base of Q803 is High level and Q803 is turned ON Then the Comp Sync is CUT The SYNC SW operation is effective in case of no separate V sync at pin I of IC801 If the separate V sync is input at pin 8 of IC801 the base of Q804 is High level and Q804 is turn O...

Page 52: ...N and pin of IC851 CPU are set High Then H sync pin a V sync pin and video pin 0 compose the CPU generated self test pattern 12V CN IN 3 I SELF ID R D715R C703G N II 0701G G D715G R706G G c704G v b q IC701 B D7i5B R705G 0 A II L J t5v RKO r RI38 4 Ic651 I CPU 5 Ic801 I F Fig 2 3 l Self Test Circuit 51 ...

Page 53: ...gnal is attenuated by IC701 and the attenuation level is controlled by the user contrast control The output signal of IC701 is supplied to IC702 The output signal of IC702 pin I is supplied to IC703 IC702 is preamplifier and the gain is adjustable by the GAIN VR702 IC703 is output amplifier R702G CN IN Video input clamp G GAIN VR702 I ABL Ifrr i Blanking Pulse Video Mute CN C User Contrast Control...

Page 54: ...of R780G which is basically determined by the current of Q78lG The raster brightness level is determied by the voltage at ihe output of lC704 3 When the voltage of 0781 G emitter is same voltage as the output of lC704 3 the DC clamping level is at cut off level 120v 0 C781G R905 CATHOD it dvvvu L902 I R78OG IAS R790 v vvu w I FC701 5 I5 Ic851 CPU Fig 3 2 l Brightness and cut off Circuit 53 ...

Page 55: ...at the video mute signal is generated y R774G 0770 0 w A8 VIDEO MUTE 0 0772 J4 7777 0 T BLANKING PULSE 77i7 Fig 3 3 l Video Blanking and Mute Circuit 3 4 ABL Circuit The maximum average current flowing through the CRT is controlled to under 450uA by limiting the video Vp p swing The voltage of CN J3 is clamped at 12 6V by 0720 when the anode current is 450uA or less If the anode current exceeds 45...

Page 56: ...tic Signal Identification Automatic Sizing Automatic Centering Memory of Picture Data The relationship of the input and the output of CPU IC851 is shown on Fig 4 l l Model USER CONTROLS V POSITION Mode2 R GAIN I G CAIN B CAIN SIO PINCIJTION Mode3 R SUB BRIGHT B SUB BRIGHT Single Chip Computer lC851 UPD78ClZA CPU PROGRAM 8bit MEMORY ROM RAM 1 o D A Converter lC852 M62359 EEPROM lC855 7 XRM93C55B XR...

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Page 60: ...d by R5A7 and R5A6 Horizontal Output pulse is input to IC5Al pin and the Saw Tooth Wave is generated at IC5Al pin 0 AFC circuit is composed by C5A3 C5A2 C5A1 R5A3 and R5A2 Horizontal Oscillation Control current f ows into the C5C7 through IC5A2 pin 0 When the voltage at IC5Al pin I reaches l 3 Vcc Charge and Discharge of C5C7 is switched by IC5Al and the Saw Tooth Wave is generated Horizontal Osci...

Page 61: ...t varies with the H position control voltage The sync signal phase can be delayed by triggering to LA7850 on the breaking edge INPUTHV 1 1 b S oisdOTH WAVE I _ I L J OUTPUT COMPARATOR TRIGGER SAW TOOTH lC5A2 CONSTANT CURRENT CIRCUIT t J7 H POS control voltage 4 C15A3 IL IL Fig 5 l 3 PARALLEL0 DISTORTION correct circuit and SAW TOOTH OSC circuit Parallel0 distortion is corrected by the H Position c...

Page 62: ...e is controlled by both H F V and H size voltage The relationship of Q504 collector voltage H FN voltage and H size voltage is shown Fig 5 l 6 I PWE 366A H OSC UNIT 24 R507 TO 0501 R511 ti R509 IC5Al Q502 Fig 5 l 5 H Drive circuit Q504 COLLECTOR VOLTAGE VI 25 t hf 27kHz HF V 11 8V lOI hf 62kHz H F V 5V I I I 1 I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 IO 11 Fig 5 l 6 The Relationship Q504 collec...

Page 63: ...E of Q506 Q507 and Q508 via PWE 366A Consequently S capacitors C507 C508 C509 and C510 are rearranged by H frequency bands The relationship of signals from PWE 366A H frequency and S capacitors is as Fig 5 l 8 L501 and L502 are Linearity coils If horizontal frequency is higher than 40 5kHz L501 is shorted by RL501 The 4FGe has several types of CRTs L501 L502 and C506 to C510 values are determined ...

Page 64: ...x19 T3 c505 C506 c507 C508 c509 c510 1501 L502 CF93P1 4KV272HB CF93P1 4KV272HB CF93P1 4KV272HB 42817011 42817011 42817011 CF93P1 4KV292HU CF93P1 4KV292HB CF93P1 4KV242HB 42817091 42817091 4281701C CF93P2G364JB CF93P2G394JB CF93P2G394JB 42839709 42839710 4283971C CF93P2G154JBW CF93P2G154JBW CF93P2G104JBW 42839303 42839303 42839601 CF93P2G274JBW CF93P2G274JBW CF93P2G334JBW 42839307 42839307 42899124...

Page 65: ... by R409 and VR403 The parabola wave and the H deflection B are applied to each terminals of IC4A3 the user control adds to subtracts from the divided B H deflection voltage The positive or negative user control voltage is obtained transforming the control voltage from the microprocessor The B H deflection voltage varies as the H frequency varies the necessary range of control voltage is also prop...

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NEC JC-1531 VMA-2, Service Manual

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Summary of Contents for JC-1531 VMA-2

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