Zenith Data Systems ZVM-124 Service Manual Download | Manualshive

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Summary of Contents for ZVM-124

Page 1: ...tate the manual and list the information in the record below DATE OF ISSUE CHANGED PAGE S PURPOSE OF SERVICE BULLETIN LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of St Joseph M...

Page 2: ...Horizontal Sync Input 4 2 Figures 1 1 The ZVM 124 Video Monitor l l Circuit Description 5 1 2 1 Video Monitor Front View 2 1 Power Supply 5 1 2 2 Video Monitor Rear View 2 1 Video and Highlight 2 3 l...

Page 3: ...10 Waveform at Base of Q501 Horizontal Driver 7 5 7 11 Waveform at Base of Q20S Video Input 7 5 7 12 Waveform at Pin 2 of VX201 Cathode of the CRT 7 5 8 1 Control Panel Assembly Installation 8 1 8 2 P...

Page 4: ...pment and Supplies The following tools test equipment and supplies are recommended for servicing this product DESCRIPTION AND SPECIFICATIONS TOOLS 1 4 nut driver Standard screwdriver 1 4 blade Phillip...

Page 5: ...rimary Fuse secondary Video Bandwidth Rise Time Horiz Frequency Vert Frequency Input Signal CRT Character Type Characters Line Character Block Page 1 2 4 0 amp type FX320 I 2 25 amp type FX70 I 18 MHz...

Page 6: ...background Vertical Size The VERT SIZE control adjusts the vertical size at the top and the bottom of video display Vertical Hold The VERT HOLD control adjusts the vertical sweep for a stable display...

Page 7: ...eN 221 C GIII lU II Tel v o B ex 209 r s o TRANSFORMER GROUND BLACK 120V WHITE BROWN NOT REMOVED Figure 2 3 120 Volt Wiring 5 Refer to Figure 2 4 and unsolder the two 120 volt transformer leads at E a...

Page 8: ...s at N the brown gray lead and C the brown lead on the fuse board 17 Refer to Figure 2 7 and remove and replace the 4 amp fuse at K on the fuse board FX201 part number 136 114 23 with a 160 amp fuse p...

Page 9: ...erface The monitor is designed to be used as a display device for a computer system The shielded cable is used to connect the monitor to the computer CAUTION A shielded cable is required by FCC regula...

Page 10: ...puter use the BASIC program shown in Listing 3 1 to fill the screen with any character as follows a Enter the program shown in Listing 3 1 into the computer You may want OPERATION to save this program...

Page 11: ...t this control interacts with the vertical hold control 6 Locate the width control on the back of the monitor and use it to adjust the horizontal size of the video display Refer to Figure 3 2 for the...

Page 12: ...ed vertical frequency of the monitor may be synchronized with the incoming sync pulse signal The lock on point of the signal is determined by the front panel vertical hold control which is adjusted to...

Page 13: ...TOR HORIZONTAL SYNC AMPLIFIER HIGHLIGHT DRIVER VERTICAL AMPLIFIER 1 HORIZONTAL PROCESSOR DC CONTRAST AMPLIFIER 1 DC CONTRAST AMPLIFIER 2 VERTICAL AMPLIFIER 2 HORIZONTAL OUTPUT DRIVER VIDEO OUTPUT AMPL...

Page 14: ...f Q701 This voltage is compared against a reference voltage generated by the CIRCUIT DESCRIPTION zener diode CR706 4 7 volts and capacitor C708 Any voltage difference will cause the collector current...

Page 15: ...egative horizontal flyback pulse coupled Page 2 from one of the outputs of transformer TXS02 When the sync and sawtooth signals are in phase the current division between the two transistors in the dif...

Page 16: ...ollapses generating the acceleration voltage need by the CRT through an internal rectifier diode Diode CR506 rectifies the focus voltage charging C205 to a static level Diode CR502 and CX514 form a da...

Page 17: ...The difference between the two ramps is coupled to the succeeding amplifier stages which restores the yoke current to the desired levels for producing a linear display on the CRT Schematic In some ins...

Page 18: ...585 77 SERVICE MANUAL Monochrome Video Monitors ZVl 1 124 and ZVl 1 124 E 7 I H Idata systems 860 65...

Page 19: ...l DISASSEMBLY Back Cover Removal 1 Refer to Figure 6 1 and position the monitor as shown Remove the three 8 18 x 625 screws at A from the back top and rear of the cabinet 2 Remove the two 8 18 x 625 s...

Page 20: ...in Board Fuse Board Removal 1 Remove the back cover and power transformer assembly 2 Refer to Figure 6 6 and remove the 8 18 x 312 hex head screw at H that secures the board to the bracket then remove...

Page 21: ...screwdriver or shock and or injury may result 2 Refer to Figure 6 8 and use a screwdriver with a jumper lead attached between it and the ground lug at G to discharge the high voltage anode lead at th...

Page 22: ...switch and LED Control Panel Assembly Removal 1 Remove the back cover the power transformer assembly the CRT socket board and the main circuit board as previously described 2 Refer to Figure 6 10 and...

Page 23: ...Figure 6 11 and disconnect the anode lead from the CRT 4 Unsolder the five wires from the terminals on the CRT deflection yoke as shown in Figure 6 12 5 Refer to Figure 6 13 and remove the four 6 32...

Page 24: ...C LEAKAGE TEST To prevent electrical shock after reassembly perform an AC leakage test on all exposed metal parts of the unit Do not use a line isolation transformer to perform this test Refer to Figu...

Page 25: ...stments that could affect the monitor s performance Refer to the operating controls part of section 3 and the service adjustments in this section FOCUS ADJUSTMENT Refer to Figure 7 2 when making the f...

Page 26: ...the monitor for proper electrical connections Check all circuit boards in the monitor for broken or burnt components or for darkened areas or other signs of component overheating Refer to Table 7 1 fo...

Page 27: ...R602 C60S R612 vertical hold control IC501 R510 R504 C504 C508 C506 C507 R525 Q802 C804 C502 R502 R50S R518 horizontal hold control 1 IC501 R505 2 R518 horizontal hold control 1 TX502 LX505 LX50S CR51...

Page 28: ...VOLTS DIV 0 01 TIME DIV 20uSEC n1 1 v ZERO REF DC i I Figure 7 10 Waveform at Base of Q501 Horizontal Driver VOLTS DIV S TIME DIV 20uSEC CRT SOCKET BOARD TROUBLESHOOTING The voltages on the schematic...

Page 29: ...3 Power Supply Troubleshooting PROBLEM POSSIBLE CAUSES No 12 7 V output 1 FX701 TX201 FX201 from power supply 2 Fuse board jumpers 12 7V adjust RX709 1 RX709 does not vary voltage 2 Q701 Q702 QX703 3...

Page 30: ...Assembly Installation Refer to Figure 8 1 1 Carefully place the control panel assembly in the front of the cabinet and feed the control shafts through the holes in the cabinet 2 Install and tighten th...

Page 31: ...llation Fuse Board Installation Refer to Figure 8 4 1 If there are any disconnected power transformer or other leads solder them in place now Use the chart you prepared in Section 6 Detailed Disassemb...

Page 32: ...nstallation Refer to Figure 8 6 1 Carefully place the monitor s cabinet face down on a smooth flat work surface 2 Carefully place the CRT in the cabinet and align it with the front mounting brackets 3...

Page 33: ...Install the remaining parts and assemblies as described in this section Back Cover Installation Refer to Figure 8 10 1 Before you install the back cover verify that there are no loose connections or p...

Page 34: ...750 20 80 2432 Extension spring CRT ground 25 A 10413 02 Wire and terminal assembly 30 95 3397 02 Transformer deflection yoke 35 A 10888 Shield assembly sweep transformer 40 HE 234 370 Plastic rail l...

Page 35: ...lytic C524 22 7860 11 330 uF electrolytic C525 22 4782 0047 uF ceramic C601 22 7613 24 01 uF ceramic C603 22 7613 24 01 uF ceramic C604 22 7613 08 470 pF ceramic C606 22 7547 0 1 uF polyester C607 22...

Page 36: ...10236 24 150K ohms RX527 63 10565 68 680 ohms Q701 121 699 PNP error amplifier 1 Q702 121 975 NPN error amplifier 2 R528 63 10235 52 150 ohms QX703 121 992 01 NPN regulator RX529 63 10559 24 10 ohms...

Page 37: ...3 10918 01 15 ohms wirewound 7 watt 5 R805 63 10235 58 270 ohms M09 63 10235 64 470 ohms R8Il 63 10235 78 1 8K ohms R815 63 9697 28 3K ohms control contrast R838 63 9697 35 250K ohms control black lev...

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