Service Manual ViewSonic VX2235wm-3 Model No. VS11446 22” Color TFT LCD Display (VX2235wm-3_SM Rev. 1a Nov.
Copyright Copyright © 2006 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.
TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 3 3. Front Panel Function Control Description 8 4. Circuit Description 14 5. Adjusting Procedure 20 6. Trouble Shooting Flow Chart 34 7. Block Diagrams 37 8. Schematic Diagrams 38 9. PCB Layout Diagrams 47 10. Exploded Diagram And Spare Parts List 52 11.
1. Precautions and Safety Notices 1. Appropriate Operation (1) (2) (3) (4) (5) (6) (7) (8) (9) Turn off the product before cleaning. Use only a dry soft cloth when cleaning the LCD panel surface. Use a soft cloth soaked with mild detergent to clean the display housing. Disconnect the power plug from AC outlet if the product is not used for a long period of time. If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
Circuit (IEC60950 or UL1950). Do not connect the CFL in Hazardous Voltage Circuit. 5.2. Handling and Placing Methods Correct Methods: Incorrect Methods: Only touch the metal frame of the LCD panel Surface of the LCD panel is pressed by fingers and or the front cover of the monitor. Do not that may cause “Mura” touch the surface of the polarizer. Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects.
2. Specification TFTLCD PANEL 1st AUO M220EW01 V0 Input Signal Sync Compatibility Compatibility Power Voltage Power Consumption Audio Ergonomics OSD Control Dimension Weight Operating Condition Storage Condition Regulation FEATURES Size Luminance (Typ) Contrast Ratio (Typ) Colors Response Time Viewing Angle (H/V) Recommend resolution Analog Digital Separate Sync Composite Sync Sync on Green PC Power Mac TV Box (NextVision 6) AC 100-240V, 50/60Hz On Mode(Typ) Off Mode (Max) 2.
Sync Signals DDC 1/2B Sync Compatibility Video Compatibility Resolution Compatibility Exclusions 4-3 TTL Compliant with Revision 1.
4-4 ELECTRICAL REQUIREMENT Horizontal / Vertical Frequency Horizontal Frequency Vertical Refresh Rate Maximum Pixel Clock Sync Polarity 24 – 82 KHZ 50 – 85* HZ 170 MHz Independent of sync polarity. Timing Table 640 x 350 @ 70 Hz, 31.5 KHz 2 640 x 350 @ 85 Hz, 37.9 KHz 3 640 x 400 @ 60 Hz, 31.5 KHz 4 640 x 400 @ 70 Hz, 31.5 KHz 5 640 x 400 @ 85 Hz, 37.9 KHz 6 7 640 x 480 640 x 480 @ @ 50 Hz, 60 Hz, 24.7 KHz 31.
36 1280 x 768 @ 85 Hz, 68.6 KHz 37 38 39 40 41 42 43 44 45 46 47 48 1280 x 960 1280 x 960 1280 x 960 1280 x 1024 1280 x 1024 1280 x 1024 1280 x 1024 1280 x 1024 1360 x 768 1400 x 1050 1400 x 1050 1400 x 1050 @ @ @ @ @ @ @ @ @ @ @ @ 50 Hz, 60 Hz, 75 Hz, 50 Hz, 60 Hz, 70 Hz, 72 Hz, 75 Hz, 60 Hz, 50 Hz, 60 Hz, 60 Hz, 49.4 59.7 75.2 52.7 64 74.6 76.8 80 47.7 54.1 64.7 65.
Note1: When the OSD is locked will lock all functions, including “Volume” and “Mute” Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD Locked” Note 3: OSD Lock should not lock Power Button and Power Lock function 4-6 AUDIO INTERFACE (SPEAKER SPECIFICATION) Line input signal Line input impedance Maximum Amp power output (Watt) Amp -THD Speaker Power rating(Ω/Watt) Signal to Noise Ratio Frequency response SPL. Line input connection 1.
3. Front Panel Function Control Description Main Menu with OSD controls Front Control Panel shown below in detail Standby Power On/Off Power light Blue = ON Orange = Power Saving Displays the control screen for the highlighted control. Also toggles between two controls on some screens. Also a shortcut to Auto Image Adjust. Scrolls through menu options and adjusts the displayed control.
Do the following to adjust the display setting: 1. To display the Main Menu, press button [1]. NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu. 2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu. 3. After the desired control is selected, press button [2]. A control screen like the one shown below appears.
Main Menu Controls Adjust the menu items shown below by using the up S and down T buttons. Control Explanation Auto Image Adjust sizes and centers the screen image automatically. Contrast adjusts the difference between the image background (black level) and the foreground (white level). Brightness adjusts background black level of the screen image. Input Select toggles between inputs if you have more than one computer connected to the VX2235wm.
Control Explanation 9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 7500K - Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 6500K-Adds red to the screen image for warmer white and richer red. 5400K-Adds green to the screen image for a darker color. User Color Individual adjustments for red (R), green (G), and blue (B). 1. To select color (R, G or B) press button [2]. 2.
Control Explanation Horizontal Size adjusts the width of the screen image. H./V. Position (Horizontal/Vertical Position) moves the screen image left or right and up or down. Fine Tune sharpens the focus by aligning text and/or graphics with pixel boundaries. NOTE: Try Auto Image Adjust first. Sharpness adjusts the clarity and focus of the screen image. OptiColor Mode provides an optimum display environment depending on the contents displayed. It contains 7 user-selectable presets.
Control Explanation Setup Menu displays the menu shown below: Language Select allows the user to choose the language used in the menus and control screens. Resolution Notice allows the user to enable or disable this notice. If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1680 x 1050, the following screen appears. OSD Position allows the user to move the OSD menus and control screens. OSD Timeout sets the length of time the OSD screen is displayed.
4. Circuit Description RTD2553V LCD Monitor/MFM Controller General Embedded dual DDC with DDC1/2B/CI Zoom scaling up and down No external memory required. Require only one crystal to generate all timing. Programmable 3.3V/5V detection reset output. Embedded crystal output to micro-controller. 3 channels 8 bits PWM output, and wide range selectable PWM frequency.
Embedded OSD Embedded 12K SRAM dynamically stores OSD command and fonts Support multi-color RAM font, 1, 2 and 4-bit per pixel 16 color palette with 24bit true color selection Maximum 8 window with alpha-blending/gradient/dynamic fade-in/fade-out, bordering/shadow/3D window type Rotary 90,180,270 degree Independent row shadowing/bordering Programmable blinking effects for each character OSD-made internal pattern generator for factory mode Support 12x18~4x18 proportional font Decompress OSD font Po
Auto-Position 1. Define the RGB color noise margin: When the value of color channel R or G or B is greater than these noise margins, a valid pixel is found. 2. Define the threshold-pixel for vertical boundary search 3. Define the boundary window of searching for horizontal boundary search. 4. Start auto-function. 5. The result can be read from register. Auto-Tracking 1. Setting the control-registers for the function (auto-phase, auto-balance) according to the Control-Table. 2. Define the Threshold 3.
Crystal Frequency Output RTD can output crystal frequency or 1/2 crystal frequency to external MCU to save a crystal device. Once power state is on and reset is finished, we can set crystal frequency by firmware and output to pin 48 and pin 110 simultaneously, and then can turn off them in Pin Share Part. Pin 48 and PIN 110 is configurable, detail setting is listed in Pin-Share part RTD2120 8051 Embedded Micro-Controller for Monitor Overview This chip is the micro-processor of LCD monitor.
5. Adjustment Procedure 1. Function Test 1.1 Product - 22” LCD Monitor 1.2 Test Equipment - Color Video Signal & Pattern (or PC with WSXGA+ resolution and a sound card) 1.3 Test Condition Before function test and alignment, each LCD Monitor should be run-in and warmed up for at least 30 minutes with the following conditions: (a) In room temperature, (b) With full-white screen, RGB, and Black (c) With cycled display modes, 640*480 (H=43.27kHz, V=85Hz) 800*600 (H=53.7kHz, V=85Hz) 1024*768 (H=68.
Analog 29. 1280 x 720 @ 50Hz, 37.5 kHz 30. 1280 x 720 @ 60Hz, 45 kHz 31. 1280 x 768 @ 50Hz, 39.6 kHz 32. 1280 x 768 @ 60Hz, 47.8 kHz 33. 1280 x 768 @ 75Hz, 60.3 kHz 34. 1280 x 960 @ 50Hz, 49.4 kHz 35. 1280 x 960 @ 60Hz, 59.7 kHz 36. 1280 x 960 @ 75Hz, 75.2 kHz 37. 1280 x 1024 @ 60Hz, 64 kHz 38. 1280 x 1024 @ 75Hz, 80 kHz 39. 1400 x 1050 @ 60Hz, 65.3 kHz 40. 1400 x 900 @ 60Hz, 55.5 kHz 41. 1400 x 900 @ 75Hz, 75 kHz 42. 1600 x 1200 @ 60Hz, 75 kHz 43. 1680 x 1050 @ 60Hz, 64.
Horizontal & Vertical Thickness Pattern (Figure 3) G. Color Pattern (Figure5) R. Color Pattern (Figure 4) B.
Black-White Pattern (Figure 9) 1.5 Function Test and Alignment Procedure 1.5.1 All Modes Reset You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function Controls) first. This action will allow you to erase all end-user’s settings and restore the factory defaults. 1.5.2 Auto Image Adjust Please select and enter “Auto Image Adjust” function on Main Menu to see if it is workable. The “Auto Image Adjust” function is aimed to offer a better screen quality by built-in ASIC.
(a) Select and enter “Manual Image Adjust” function on OSD Main Menu. (b) Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to adjust the video boundary to be full scanned and within screen frame. 1.5.7 White Balance Test Signal: 1680*1050@60Hz Test Pattern: White and Black Pattern 1.5.8 R, G, B, Colors Contrast Test Signal: 1680*1050@60Hz Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern - Check and see if each color is normal and distinguishable.
2. Firmware Upgrade Procedure When you receive the returned monitor, please check whether the firmware version is the latest. If not, please do the following procedures to upgrade it to the latest version. 2.1 Equipment Needed - VX2235WM3 Monitor - Fixture for Firmware Upgrade - VGA Cable - PC (Personal Computer) - LPT Cable - Firmware Upgrade Program - One additional monitor for checking the program execution 2.2 Setup Procedure 2.2.1 Connect P2 of Fixture with printer port of PC by LPT Cable. 2.2.
Step 2: Load file Press the Load MCU File button to select the file will be download. (*.hex) Step 3: Run Pressing the Run Button to start download program. Press OK button to Enter ISP mode. Step 4: Download program finish Pressing the OK Button to finish the download program procedure. Trouble shooting: If you find the status like the follow picture. Please check the following item. a. The connecting status between PC and ISP board. b. The connecting status between ISP status and Monitor.
3. DDC Key In Procedure Note: 1. Every time after replacing the main board, you have to do the DDC key in. 2. If you find the DDC does not conform to the monitor, you have to do the DDC key in. 3.1 Equipment Needed - VX2235WM3 Series Monitor - DDC Card - PC - RS232 cable - DVI-DVI Cable - Barcode Reader - VGA Cable VX2235WM3 RS232 cable DDC Card VGA cable PC BAR code reader 3.2 Setup Procedure 1.Connect VGA Card and DDC Card with RS-232 cable. 2.
3.3 DDC Key In Procedure 1.Run DDC.exe 2.Choose model number and conform the Time then Press “ENTER” key. 3.When appear the PIC “ choose DDC Card”, Press ALT+2 .Enter DDC 2B test interface. Choose DDC Card 4.Press F8 to choose corresponding model.DAT(VX2235WM3A.DAT press“ENTER” key) VX2235WM3_A means the DDC under analog mode. VX2235WM3D means the DDC under digital mode.
5.Press F9 enter the download interface 6.Key in the serial number or use the barcode reader to scan the barcode of the monitor, and press “ENTER” key. 7.The successful picture is as follows. ”Compare EDID ：OK! Press any key to continue”.
Packing For Shipping And Disassembly Procedure Packing For Shipping 1. Packing Procedure 1.1 Paste protection film to protect the LCD TV. (Figure 1) 1.2 Put the LCD TV in the PE bag and seal the bag. (Figure 2~3) Figure 2 Figure 1 Figure 3 1.3 Put the cushions on the LCD TV. (Figure 4) 1.4 Place the LCD TV into the carton and then Put the other cushions on the LCD TV,put all the accessories into the carton. At last, close the carton and seal it with tape. (Figure 5) DVI Cable 1.Power Cord 2.
Disassembly Procedure 1. Disassembly of Stand and Dust Cover from LCD TV. 1.1 Unscrew 4 screws that secure Stand Unit and detach Dust Cover from the LCD TV.
2. Disassembly of Rear Cover. 2.1 Unscrew 8 screws to remove Rear Cover. Rear Cover 3. Disassembly of Main Board,Power Board,IR Board,Speaker,Front Cover and Panel Unit. 3.1 Unscrew 7 screws to remove Shield Plate.
3.2. Unscrew 6 screws and disconnect the wires to remove Power Board. Power Board 3.3. Unscrew 2 screws and disconnect the wires to remove Main Board.
3.4. Unscrew 8 screws to remove Speaker and bracket fix. Bracket,Fix Speaker 3.5. Unscrew 8 screws to remove Front Cover.
3.6. Lay Panel Unit facedown and unscrew 4 screws on its right and left sides, to remove Panel Unit and Panel Bracket.
6.
6.1. NO POWER 6.2.
6.3.
7.
8. Schematic Diagrams 8.1. DC TO DC +5V modify value 7/6 R101 1K C101 R103 0/NC C 1 R102 100 R104 NC/4.7K B E 2 100nF on_BACKLIGHT 4 +5V Q101 NC/MMBT3904 P101 CON9 R105 1K DGND R106 200R 2A 0805 5V_PANEL C102 R107 C L101 100 B R108 NC/1uF NC/1K adj_BACKLIGHT 4 NC/MMBT3904 5V_AMP 5 C103 100nF DGND L102 DGND 200R 2A 0805 +5V LCDVDD C105 100nF + C104 100uF/16V C0603 D DGND 0/NC Q102 E 1 2 3 4 5 6 7 8 9 modify value 6/27 DGND R110 3.
8.2. INPUT P102 P.4 and P.
8.3. SCALER R3.3DVCC L105 3.3DVCC 80R 0805 3.3DVCC Closed to Scaler XI R135 0 4 XO_24M VDA_1V8 C119 C120 C121 100nF 100nF 100nF DGND C126 C127 + 10uF_16V 100nF C128 GND POWER C129 C130 100nF 100nF 100nF DGND DGND R145 2 2 4.7K GND POWER R146 R147 NC/4.7K 1K R3.3DVCC value:80R C133 C134 100nF 100nF GND POWER RX2P RX2N 2 RX1P 2 RX1N TMDS_VDD 2 2 RX0P RX0N 2 2 RXCP RXCN RX2P RX2N RX1P RX1N RX0P RX0N RXCP RXCN R1.
8.4. MCU VCC_MCU 2N3906 8 7 6 5 10uF/16V R182 Q108 100nF 4.7K IICSDA IICSCL K D128 RP03 A R159 R189 2.2K 10K 10K 1 2 3 4 1 on_BACKLIGHT NC/AT24C04N-10SC 2,3 SCL_D2 2,3 SDA_D2 44 45 46 47 48 1 2 3 GREEN ORANGE R160 22 R161 22 UP DGND 5 HDCP_SCL HDCP_SDA 9 10 11 12 13 14 MUTE_S DOWN POWER 2,3 SDA_D1 2,3 SCL_D1 HDCP EEPROM R163 R164 22 22 TX RX MUTE pin change to mcu p5.0 R165 MUTE_S pin change to mcu p3.3 2.2K ADD NET HDCP_SCL HDCP_SDA 8 5 P5.0/DA0 P5.1/DA1 P5.2/DA2 P5.
8.5. Audio Amplifier from two smt 0805 bead modify dip type and make a drill include of the cap 1500UF 060728 3.3DVCC+5V 5V_AMP AMP_VCC L607 modify value 0616 80R DIP 1,3,4 3.3DVCC 1 5V_AMP R601 NC/10K C602 100n C601 1500uF/10V DGND R602 10K/NC R603 C + R604 0 DGND AMP_VCC 4 Q601 NC/MMBT3904 SOT-23 B VOLUME E NC/1K DEL C604 , C623 DGND hunk 06'0706 GND_PG R607 DGND R616 4.
8.6.
8.6.
8.8. INVERTER P901 L901 24V T901 6 7 5 4 3 2 1 10 2374301604P jumper 5 6 7 8 5 6 Q910 1 7 jumper 8 1K L902 3 R906 1 C902 R905 15P,3KV C903 2 3M,3KV P902 15P,3KV 2SC945P 1 2 2 C905 Q905 4 3 2 1 4 3 P2804HVG D907 C912 1N4148 0.
8.9. POWER L803 jumper 1 100K/1/4WS R836 + 8 R821 C821 22 1/2W 1000PF/1KV C822 D806 UF4007 100K/1/4WS 100K/1/4WS L806 3Ts 6*10 5 1 7 C829 + C823 + L804 5.
9. PCB Layout Diagrams 9.1.
9.2.
9.3. CON PCB TOP VIEW 9.4.
9.5.
9.6.
10.
ViewSonic Corporation Confidential - Do Not Copy 53 VX2235wm-3
EXPLODED PARTS LIST (VX2235wm-3) ViewSonic Model Number: VS11446 Rev: 1a Serial No.
PACKING PART LIST (VX2235wm-3 ) ViewSonic Model Number: VS11446 Rev: 1a Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ViewSonic Corporation Confidential - Do Not Copy 55 VX2235wm-3 ViewSonic P/N Ref.
11. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VX2235wm-3) ViewSonic Model Number: VS11446 Serial No. Prefix: QCZ Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Accessories: PC Board Assembly: Cabinets: Cables: Documentation: Electronic Components: Packing Material: Plastics: Rev: 1a Description Power Cord 1.83M Wall ( USA ) Power Cord 1.83M Wall ( CHINA ) Main Board Control Board Power Supply Board Front Panel Back Cover - Black Video IO Cable D15/D15 20276(4.5) 1.
BOM LIST (VX2235wm-3) ViewSonic Model Number: VS11446 Rev: 1a Serial No.
Item 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 ViewSonic P/N E-R-0405-1757 E-R-0405-3235 E-R-0405-3235 E-R-0405-3235 E-R-0405-3235 E-R-0405-3214 E-R-0405-3214 E-R-0405-3214 E-R-0405-3214 E-R-0405-3214 E-R-0405-3221 E-R-0405-3221 E-R-0405
Item 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 ViewSonic P/N N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A E-R-0405-6419 E-R-0405-6419 E-R-0405-6419 E-R-0405-6
Item 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 ViewSonic P/N E-C-0404-1856 N/A N/A N/A N/A E-00005729 E-00003555 E-00003555 N/A N/A N/A E-C-0404-1838 E-C-0404-1833 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N
Item 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 ViewSonic P/N E-C-0404-3815 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A E-Q-0402-1607 E-Q-0402-1607 E-Q-0402-1607 E-Q-0402-1607 N/A N/
Item 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 ViewSonic P/N N/A E-00005306 E-D-0403-1465 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A E-D-0403-0531 E-D-0403-0531 E-D-0403-0531 E-D-0403-0531 E-D-040
Item 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 ViewSonic P/N N/A N/A N/A N/A N/A N/A N/A N/A N/A E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403-1779 E-D-0403
Item 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 ViewSonic P/N E-L-0407-0041 N/A E-L-0407-1606 E-00003533 E-00003533 N/A N/A N/A E-00008180 E-00008181 M-SW-0815-0182 M-SW-0815-0182 M-SW-0815-0182 M-SW-0815-0182 M-SW-0815-0182 N
* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation. Assessment A. What do you think about the content of this Service Manual? Unit Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6.
