EW780-4290-00900 MHz Cordless Phone Base Unit

VTECH ENGINEERING CANADA LIMITED TITLEVT3921 Internal Product Specification MODELVT3921 Reference:Revision: 1.0Page: 1 of 98 This document is proprietary to VTECH ENGINEERING CANADA LTD.63187 Specifications are preliminary and are subject to change without notice. VT3921 Internal Product Specification NOT FOR EXTERNAL RELEASE Document ID: SPE-6500.DOC PRC #: Note: All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means. The only controlled copy of this document is kept in electronic form on the VTECH computer network. All printed copies are uncontrolled documents and are not updated. This Procedure is the property of VTECH Engineering Canada Ltd., and shall be returned upon request . Prepared ByLance Fujioka TitleProject Assistant Approved ByJack Minney TitleProduct Manager VTECH ENGINEERING CANADA LIMITED TITLEVT3921 Internal Product Specification MODELVT3921 Reference:Revision: 1.0Page: 2 of 98 This document is proprietary to VTECH ENGINEERING CANADA LTD.63187 Specifications are preliminary and are subject to change without notice. Revision History Revision NoDescriptionPageEffective Date PreliminaryJUN-99 1First Release15-JUN-99 Table of Contents 1.Overview....................................................................................10 1.1General Description................................................................................... 10 1.2System Components ................................................................................. 10 1.3System Supports Add – On Components................................................ 10 1.4Feature List ................................................................................................ 10 1.4.1System Features ..................................................................................................................10 1.4.2Controller Features .............................................................................................................10 1.4.3Cordless Phone Features ...................................................................................................11 1.4.4Speaker Phone Features.....................................................................................................11 2.Speaker Phone ..........................................................................12 2.1General Description................................................................................... 12 2.2Product Overview ...................................................................................... 12 3.User Features ............................................................................13 3.1User Feature Overview .............................................................................. 13 3.2Installing The Speaker Phone................................................................... 14 3.3Using The Speaker Phone ........................................................................ 16 Speaker Phone Keys ........................................................................................... 18 3.5Making Internal (COM) Calls ..................................................................... 19 3.6Making Outside Calls ................................................................................ 20 3.7SPEAKER Button ....................................................................................... 20 VTECH ENGINEERING CANADA LIMITED TITLEVT3921 Internal Product Specification MODELVT3921 Reference:Revision: 1.0Page: 3 of 98 This document is proprietary to VTECH ENGINEERING CANADA LTD.63187 Specifications are preliminary and are subject to change without notice. 3.8Global Hold................................................................................................. 20 3.9Private Hold ................................................................................................ 21 3.10 Call Transfer............................................................................................... 21 3.11 Call Waiting ................................................................................................ 22 3.12 Automatic Answer ..................................................................................... 23 3.13 Redial .......................................................................................................... 23 3.14 Call Connect/Pick Up................................................................................. 23 3.15 Store Last Number Dialed ......................................................................... 24 3.16 ‘One Touch’ Storing .................................................................................. 24 3.17 ‘One Touch’ Dialing ................................................................................... 25 3.18 Uses Of System - Wide Directory ............................................................. 25 3.19 Dialing System - Wide Directory............................................................... 25 3.20 Ring Paging................................................................................................ 26 3.21 Page All....................................................................................................... 26 3.22 Extension Paging....................................................................................... 26 3.23 Conference Calls ....................................................................................... 27 3.24 Call Forwarding.......................................................................................... 28 3.25 Callback/Camp - On ................................................................................... 28 3.26 COM Callback/Camp - On.......................................................................... 29 3.27 Mute 29 3.28 Release Line Privacy ................................................................................. 29 3.29 Do Not Disturb (DND) ...................…

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TECHV ENGINEERING CANADA LTD. 200-7671 Alderbridge Way, Richmond B.C. Canada V6X 1Z9 FAX: (604) 276-9137 TEL: (604) 273-5131 FCC ID: EW780-4290-00 Federal Communications Commission 7435 Oakland Mills Road, Columbia, Maryland 21046 Authority To Act As Agent To The Federal Communication Commissions I appoint KTL Ottawa Inc. to act as agent in the preparation of applications for equipment authorization on our behalf to the Federal Communications Commission. I certify that exhibits submitted properly describe the devise or system for which equipment authorization is sought. I also certify that each unit manufactured, imported or marketed, as defined in the commissions regulations will have affixed to it a label identical to that submitted for approval with this application. Dated this __5th_day of ____October__1999 Agency Agreement Expiration Date: Mar. 1, 2000 By:_ _Joseph Poon (Signature)(Printed) Title: Senior Regulatory Compliance EngineerTelephone: (604) 273-5131 Applicant: VTECH Engineering Canada Ltd.

October 12, 1999 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, Maryland 21046 USA Dear Sir/Madam:Our File Ref. 9R01807 FCC ID: EW780-4290-00 Applicant: VTECH Communications Ltd. Equipment: VTECH VT3921 Cordless PABX Base and Adapter Module FCC Confirmation no.: EA95635 We have successfully electronically filed all the required documentation for an application for certification in accordance with FCC Part 15, Subpart C on the above mentioned equipment, October 12, 1999. Enclosed, please find a cheque in the amount of $940.00 US, a copy of FCC Remittance Form 159, a copy of the FCC Form 731 confirmation number and a copy of the list of exhibits. Please also note that on the FCC Form 731, there is a spelling error for the Contact Name for the Applicant. Your records indicate Bruce V. Kennard as the Contact Name (Section I, item 4). It should state Bruce V. Bernard. Please correct your records. Thank you. If you require additional administrative information, please do not hesitate to contact me at 1-800-563-6336 (extension 232). If you require additional technical information, please contact Mr. Russell Grant at same (extension 223). Thank you in advance for your assistance in this matter. Sincerely, Ruby Dulmage Administrative Clerk KTL Ottawa Encl.

110mm 25mm R1.5 mm (X4) THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: 1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE; AND 2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSURED WHEN USING THIS PHONE. MODEL : VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONS LTD. MANUFACTURED IN CHINA CORDLESS TELEPHONE ® FCC LABEL- VT3921 CORDLESS PABX WITH UL MARK HAC FCC ID: EW780-4290-00 110mm 25mm R1.5 mm (X4) THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: 1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE; AND 2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSURED WHEN USING THIS PHONE. MODEL : VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONS LTD. MANUFACTURED IN CHINA CORDLESS TELEPHONE ® FCC LABEL- VT3921 CORDLESS PABX WITHOUT UL MARK HAC FCC ID: EW780-4290-00

110mm 25mm R1.5 mm (X4) THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00 VT3921 CONTROLLER UNIT 5 NOV,99 FCC LABEL STICK POSITION WITH UL MARK THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00

110mm 25mm R1.5 mm (X4) THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00 VT3921 CONTROLLER UNIT 5 NOV,99 FCC LABEL STICK POSITION WITH UL MARK THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00

110mm 25mm R1.5 mm (X4) THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00 VT3921 CONTROLLER UNIT 5 NOV,99 FCC LABEL STICK POSITION WITH UL MARK THIS DEVICE COMPLIESWITHPART 15 OFTHE FCCRULES. OPERATION IS SUBJECTTOTHE FOLLOWINGTWO CONDITIONS: 1)THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE;AND 2)THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. PRIVACY OF COMMUNICATIONS MAY NOT BE ENSUREDWHEN USINGTHIS PHONE. MODEL:VT 3921 AC18V 2.2A CLASS 2 POWER SOURCE ONLY VTECH COMMUNICATIONSLTD. MANUFACTURED IN CHINA CORDLESSTELEPHONE ® HAC FCC ID: EW780-4290-00

900 MHz DIGITAL Single line ADPCM cordless phone with CIDCW Model: VT1910C THEORY OF OPERATION January 29, 1996 PRC: 001R REVISION 1.0 FILE: PDLPRT15.DOC THIS DOCUMENT IS PROPRIETARY TO: VTECH ENGINEERING CANADA LTD. TABLE OF CONTENTS SECTION 1 RF SECTION OVERVIEW........................................................................... 1 1.0 Introduction ..................................................................................................................................................... 1 1.1 Frequency Tables ............................................................................................................................................ 2 1.1.1 Handset ....................................................................................................................................................... 2 1.1.1 Base ............................................................................................................................................................ 2 1.2 Block Diagram ................................................................................................................................................. 3 SECTION 2 RF SECTION DETAILED OPERATION ...................................................... 4 2.1 Antenna Section................................................................................................................................................ 4 2.1.1 Antenna....................................................................................................................................................... 4 2.1.2 Duplexer ..................................................................................................................................................... 4 2.1.3 RX, TX Bandpass Filters............................................................................................................................ 4 2.2 Receive Section ................................................................................................................................................. 6 2.2.1 RX Amps and SAW Filter .......................................................................................................................... 6 2.2.2 RX Mixer.................................................................................................................................................... 7 2.2.3 RX VCO and LO Buffer............................................................................................................................. 7 2.2.4 RX Synthesizer ........................................................................................................................................... 7 2.2.5 IF Amplifier Stage ...................................................................................................................................... 8 2.2.6 IF Filtering.................................................................................................................................................. 8 2.2.7 Demodulator, Data comparator, Mute Comparator .................................................................................... 8 2.3 Transmit Section............................................................................................................................................... 9 2.3.1 TX Amp...................................................................................................................................................... 9 2.3.2 TX VCO ..................................................................................................................................................... 9 2.3.3 TX Synthesizer/PLL ................................................................................................................................... 9 SECTION 3 BASEBAND SECTION.............................................................................. 10 3.0 General Description ...................................................................................................................................... 10 3.1 Detailed Functional Description................................................................................................................... 10 3.1.1 Protocol Functions.................................................................................................................................... 10 3.1.2 Audio Functions ....................................................................................................................................... 10 3.1.3 System Control Functions......................................................................................................................... 10 SECTION 4 COMPLETE SYSTEM DESCRIPTION...................................................... 13 4.0 General Description for Handset ................................................................................................................. 13 4.0.1 RF / ASIC Interface .................................................................................................................................. 13 4.0.2 Handset Serial Buss Connections ............................................................................................................. 13 4.0.3 Other Handset Connections ...................................................................................................................... 13 4.1 General Description for Base ....................................................................................................................... 13 4.1.1 RF / ASIC Interface .................................................................................................................................. 13 4.1.2 Base Serial Buss Connections .................................................................................................................. 13 4.1.3 Other Base Connections ..............................…

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VTECH Engineering Canada Ltd. VTECH VT3921 – Cordless PABX Description VT 3921 is a home and small business cordless telephone system. The system combines a multi-featured phone system and a fax and modem switching network into one unit. It supports 3 telephone company lines, 1 internal line and 14 stations. All of the stations are connected together on a shared wire like the telephone wire that exists in the walls of most homes. The system greets callers with an electronic voice receptionist at which point the caller can dial an extension number of a particular station. Incoming fax calls are automatically transferred to the fax machine without user intervention. The system includes business telephone features like hold, call transfer, call pick-up, toll-restriction, speed-dialing and many other useful feature. Built-in the system is the 3 independent transreceivers which can communicate with 3 handsets under the 900MHz band. These are equivalent to combine three 900MHz cordless phones onto a PABX system. The handsets has the FCC ID : EW780-4042-00 which were approved under the category of 900MHz telephone. Since the controller unit has 3 transreceiver (900MHz), new approval is required under this application (assigned FCC ID is EW780-4290-00). Following please find :- (1) Connections of the whole system (2) Brief description of system components (except handsets & handset chargers) (3) FCC Part 15 certificate for the handset (original approval on both handset & base)

 BOM203 VTECH Communications Ltd. (TEL) 9/10/99 8.53.04 PAGE 1  BOM MATERIAL LISTING LISTING INDENTED ALL COMPONENTS W/O SIGNED LINE W/O CUSTOMER P/N From Class To 99 From Item 80-4290-00-00 To 80-4290-00-00 Facility C/B Days Cum Bub Seq It Child Rv It Qty Cum Scrap Eff Disc Opr DYS Comp Cost Lead Lead Fac Must Approval Spec. 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(TEL) 9/10/99 8.53.04 PAGE 2 BOM MATERIAL LISTING LISTING INDENTED ALL COMPONENTS W/O SIGNED LINE W/O CUSTOMER P/N From Class To 99 From Item 80-4290-00-00 To 80-4290-00-00 Facility C/B Days Cum Bub Seq It Child Rv It Qty Cum Scrap Eff Disc Opr DYS Comp Cost Lead Lead Fac Must Approval Spec. Country Level No No Ty Item Description No Cl Reqd Qty UM Factor Date Date No OFS Code % Time Time Cd Iss Date Date of Org. 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(TEL) 9/10/99 8.53.04 PAGE 3 BOM MATERIAL LISTING LISTING INDENTED ALL COMPONENTS W/O SIGNED LINE W/O CUSTOME…

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ABCDEFGH ABCDEFGH 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TS1 1 Z4 1 Z3 1 Z2 1 Z1 1 J1 1 2 + - U2 MC34074 6 5 7 + - U2 MC34074 13 12 14 + - U2 MC34074 9 10 8 + - U3 MC34074 2 3 1 + - U2 MC34074 2 3 1 D5 1N5234 A K C20 10UF 12 C17 3300PF 12 C9 0.022UF 12 C8 56PF 12 C7 150PF 1 2 C6 56PF 12 C27 4.7PF 1 2 C26 10PF 1 2 C24 470PF 1 2 C23 3300PF 12 C18 1000PF 1 2 C12 0.47UF 1 2 C21 1000PF 1 2 C25 4.7PF 1 2 C3 0.1UF 12 C4 0.1UF 12 C16 .022UF 12 C14 0.1UF 1 2 C13 0.1UF 1 2 C11 0.1UF 1 2 C19 .047UF 12 C5 150PF 1 2 C15 0.047UF 12 + C1 47UF 12 + C2 47UF 12 D1 1N4148 A K D3 1N4148 A K D25 1N4148 AK D6 1N4148 A K D7 1N4148 A K D8 1N4148 A K D4 1N4148 A K D2 1N4148 A K NRES DGND RD2 DVDD DRET DVSS RD1 OP2 EIPB0 EIPB1 EIPB2 EIPB3 EIPA0 EIPA1 EIPA2 EIPA3 VCXB PLIN PLLO XBA RASW TIB TEA TEB TIA VCPO PKS3 PKS2 PKS1 PKS0 TXFO TAN TGND RAN RA PLIO ESTB ISTB MSTB AVSS AVDD LS TAO MEB RGND RAO RXEN PGND VCIN VCXO VCXI SDL SDCK SDO P4R2 P5R1 P6G2 P7G1 P0G3 P1G4 P2R3 P3R4 TA TXFP RXFP RXI RGND RXEO TXO U1 CIS1000 36 58 17 18 35 68 4 3 2 1 8 7 6 5 34 12 48 46 11 10 9 OP2 19 20 21 22 23 24 25 26 62 13 14 15 16 60 61 59 49 50 44 56 57 51 54 55 52 53 31 33 32 40 42 41 30 29 43 27 28 39 38 37 63 64 67 65 66 45 47 R8 49.9K 12 R7 49.9K 12 R37 36K 12 R86 750 1 2 R4 750 1 2 R3 39K 1 2 R51 1.82K 12 R48 1.0M 1 2 R46 20K 12 R43 20K 12 R41 39K 1 2 R40 62K 12 R38 620 1 2 R35 39K 1 2 R30 9.1K 1 2 R28 12K 12 R27 12K 12 R25 12K 12 R22 49.9K 1 2 R21 36K 1 2 R20 49.9K 1 2 R18 80.6K 12 R16 80.6K 12 R13 49.9K 12 R12 49.9K 12 R1 20K 1 2 R50 1.82K 12 R9 49.9K 12 R23 49.9K 1 2 R11 49.9K 12 R10 249 12 R14 49.9K 12 R15 80.6K 12 R2 20K 1 2 R17 80.6K 12 R29 10K 1 2 R45 33K 1 2 R44 620K 1 2 R39 62K 12 R33 120K 12 R32 470K 1 2 R34 36K 1 2 R31 120K 12 R36 20K 12 R6 49.9K 12 R19 49.9K 12 R47 80.6K 1 2 R5 249 12 R24 33K 1 2 R26 33K 1 2 Q4 2N3904 B C E Q3 2N3904 B C E Q1 2N3904 B C E Q2 2N3904 B C E Q5 2N3904 B C E Q6 2N3904 B C E D11 RD_LED AK D12 RD_LED AK D10 RD_LED AK D9 RD_LED AK SW7DIP SW1 7 8 SW7DIP SW1 6 9 SW7DIP SW1 5 10 SW7DIP SW1 4 11 SW7DIP SW1 3 12 SW7DIP SW1 2 13 SW7DIP SW1 1 14 TP4 1 TP3 1 TP1 1 TP2 1 1504 Brookhollow Dr. Santa Ana, CA 92705 Suite 118 Rev No. Checked by: Drawn by: Sheetof Drawing Number: File: Systems Integrated Creative CIS6158B 7/27/99 12 1:31:48 PM C28 4~20PF 1 2 Y1 8MHZ 2 1 3 VSS VSS 8MHZ {02} TXOI_F VSS GND VSS MLP_F GND GND GND GND GND GND MLN_F VSS GND VDD VDD GNDVOICE GND GND VDD VSS GND GND OHSENSE GND LS {02} VSS ISTB TEA {02} TEB {02} VSS OP2 {02} VDD 7 A 13 12 11 10 1% 1% 1% 1% 1% 63V 63V CIS6158 2SWITCH UP IS CLOSED 2 1% 1% 1%1%1% 1% 1% 1%1% 1%1% 1% 1%1%1% 1% ALL RESISTORS ARE 1/16W 5% LINE JOHN STOCKMAN Adapter Box w/wink NOTES: 1 UNLESS SPECIFIED OTHERWISE =SWITCH UP =SWITCH DOWN L3L2L1COM SWITCH POSITION STA PHONE ANSWER MACHINE MODEM FAX 17 NO 2 1 6 5 4 3 9 8 7 0 ABCDEFGH ABCDEFGH 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 TEST PAD 1 CD4040B U5 10 CLK 11 RESET 9 Q1 14 Q10 15 Q11 1 Q12 7 Q2 6 Q3 5 Q4 3 Q5 2 Q6 4 Q7 13 Q8 12 Q9 Q8 MPSA42 B C E T08A T1 1 45 8 DJ005 J3 1 2 3 J2 1 2 + - U3 MC34074 6 5 7 + - U3 MC34074 9 10 8 + - U3 MC34074 13 12 14 Q10 MPSA92 B C E 4066 U4 12 1110 4066 U4 6 98 4066 U4 13 21 4066 U4 5 43 C36 150PF 1 2 C37 150PF 1 2 C40 N/U 1 2 C34 .047UF 1 2 C35 0.10UF 1 2 C38 .047UF 1 2 C39 .047UF 1 2 + C47 1.0UF 1 2 + C46 4.7UF 1 2 + C45 4.7UF 1 2 + C30 47UF 1 2 + C43 4.7UF 12 + C44 4.7UF 1 2 + C42 4.7UF 1 2 + C32 330UF 1 2 + C29 330UF 1 2 + C31 47UF 1 2 + C41 100UF 1 2 D28 1N4148 AK D24 1N4004 AK D26 1N4002 AK D27 1N4002 AK D33 1N4002 AK D32 1N4002 AK D29 1N4002 A K D30 1N4002 AK D31 1N…

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