120v Ac

Set the variable AC supply to 0 volts 2. Connect the power cord between the supply and the DC-1. 3. Turn the DC-1 rear panel Power switch ON and slowly bring up the voltage to 120VAC. The current should not exceed 0.3 Amps for 100 120V testing (0.15Amps for 220 240V) . If the unit draws excessive current, turn the DC-1 off and check the supply rails for shorts. 4. Use a DMM to measure all the power supply rails by using the DC-1 chassis ground as the 0VDC reference. Verify that all voltages are...

164

049,50,59,60,79,80,89,90,109, 0110,119,120,139,140,149,152, 0173-176,181,182,189,190 048,250,251,309 R60,63,84,87,108,111,132,135, R166-169,221 R60,63,68,71,74,77,84,87,92,95, R98,101,108,111,116,119,122,125, R132,135,140,143,146,149, R166-169,221 R40,48,171,172,174-176,178,222 R165,170 R72,73,78,79,96,97,102,103,120, R121,126,127,144,145,150,151 R69,70,75,76,93,94,99,100, R117,118,123,124,141,142,147,148 R68,71,74,77,92,95,98,101,116, R119,122,125,140,143,146,149 R69,70,75,76,93,94,99,100,...

3

The information in this section can help determine whether or not a unit is Quick Performance operating correctly. Always complete the performance verification before pro- heck ceeding to the troubleshooting procedures. 1. Check each front panel switch for smooth mechanical operation and verify that the display acknowledges its function. 2. Verify that all of the front panel LEDs light. 3. Check all the buttons on the remote and verify that the display is responding to all the remote commands....

37

700-10472 COVER, TOP, 2U X 10.3 701-09863 CLAMP, HEATSINK, TO-220 704-10481 HEATSINK, T0-220 703-10479 LENS, DC-1 703-11334 LENS, SDP-2 023-10404 PL, MAIN BD ASSY, DC-1 023-11204 PL, THX MAIN BD ASSY, DC-1 023-11209 PL, AC 3 MAIN BD ASSY, DC-1 023-11433 PL, AC 3 MAIN BD ASSY, SDP-2 _ 024-10406 PL, VIDEO MAIN BD ASSY 024-10407 PL, VIDEO RCA BD ASSY 024-10408 PL, IR BD 024-10409 PL, ENCODER BD 024-10410 PL, PWR SWITCH BD 024-11237 PL, AC 3 DGTR BD ASSY 024-11275 PL, LOGO LED BD 430-10988 DISP,...

475525

Clean, antistatic, well lit work area Digital Multimeter (DMM) 3.5 digit, 0.5 , or better, accuracy Two trigger outputs are available on the rear panel 5-pin DIN connector labeled PWR CTL. The Remote Power Control Trigger is high wheneverthe DC-1 son. This trigger goes low in Standby, or off. The Remote Aux Control Trigger may be assigned to be activated for specific inputs, or it may be controlled via the remote control by holding down ACCY while pressing BAL (on) or Bal (off). Each trigger...

4f

Lett Right Center Subwoofer L Side R Side Sheets 11 and 12, which show the left and right inputs, respectively, are virtually Analog Audio Inputs identical. Each input also uses similar components. Series ferrite beads and (sheets 11 & 12) 150pF ceramic caps to ground are installed to reduce RFI. 100Q series resistors serve two purposes to limit current to the BAV99 diodes under overvoltage conditions, and to provide a minimum load of 100Q rather than a short to ground to other equipment...

5

DC-1 Theory of Operation is divided into three sections digital, analog and Operation video. The digital section discusses the Z80 host processor and its peripherals, system clocks, the PIC microcontroller, the Lexichip and 56004 digital signal processors, and the upgrade path for discrete 5.1 sound capability. The analog section includes the signal paths for both analog and digital audio inputs, A D and D A conversion, level controls and the power supply. The video signal paths and on-screen...

6 Video Inputs

Five video input sources are provided. VCR1, VCR2 and V DISC, have both composite and S-video capabilities. (S-video is selected in preference to the composite signal.) AUX and TV accept composite only. Video inputs are selected with their corresponding audio inputs and fed to the appropriate monitor output jack. Record sources can be selected independently. To prevent a feedback loop with the record outputs, VCR1 and TAPE are normally restricted from assignment as record outputs. TAPE, TUNER,...

A

Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument. Indicates dangerous voltage. (Terminals fed from the interior by voltage exceeding 1000 volts must be so marked.) - The WARNING sign denotes a hazard. It WARNING ca s attention to a procedure, practice, condition or the like which, if not correctly performed or adhered to, could result in injury or death...

Caution

Electrostatic Discharge (ESD) Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper insertion. Keep parts in original containers until ready for use. Avoid having plastic, vinyl or styrofoam in the work area. . Wear an anti-static wrist-strap. Discharge personal static before handling devices. Remove and insert boards with care. When removing boards, handle only by non-conductive surfaces and never touch open-edge connectors...

Cd

Separate OFF and ON buttons are provided for learning remotes, so that an automated key sequence does not require information regarding the current on off status of the unit. OFF puts the unit into standby with audio muted, video blanked, the LCD and all LEDs, except for IR activity, turned off. The IR LED remains illuminated and the IR receiver remains active. The selected input, record status, current effect, volume and balance settings, and bypass state are saved. ON umutes audio and...

Cvvd

Lexichip Audio Memory Address Bus not used AC3 output bitclock (256x wordclock) AC3 output word-select (4x wordclock) AC3 Input bitclock (64x wordclock) AC3 DSP Serial-control Chip Select AC3 input output framing signal (1x wordclock) AC3 general purpose I O bit 0 AC3 general purpose I O bit 1 reset to AC3 DSP AC3 serial audio output (256x wordclock) not used A D Converter Framing Signal (1x wordclock) A D Calibration Enable (active high) A D Calibration Enable (active low) AES bitstream...

Hinh

Record source select Record Y enable Monitor chroma enable Record chroma enable Monitor composite, inhibit SY out Record composite, inhibit SY out Select 625 50 (PAL) OSD crystal SECAM overlay 'transparency' Inhibit OSD crystal oscillator Inhibit OSD dotclock oscillator Five status bits are brought to the host connector, as described above the 3 bits from the S-video DIN auxiliary contacts, signal detectfrom U9, and vertical sync. Most of the analog video circuitry is powered by +5VA, which is...

I

Eight stereo analog audio inputs are switched with corresponding video inputs and fed to the Main outputs. Inputs are nominally labeled as originating from an audio tape player, tuner, CD player, an unspecified auxiliary source, a TV tuner, a Laser or Video Disc player, asecondary, and a primary VCR. Each pair of stereo audio outputs supplies the same signal according to the record input selection. ZONE2 signal levels can be controlled independently for use with a second set of amplifiers and...

Info

The OSD chip is natively PAL-capable. Selecting PAL mode involves both programming internal OSD registers and selecting the 4xfsc crystal with U12-4. The OSD generates the 625-line 50Hz PAL raster and encoded PAL color. For SECAM compatibility, the fullscreen OSD is configured for 50Hz monochrome grayscale. During overlay, switch U8-15 bypasses the high-frequency SECAM color-subcarriers around the OSD. With SECAM, overlaid characters are not carved out of the thru video as well as they are in...

Knobs 55010486

SW,ROCKER,2P1T,16A 250,VER,1-0 CONN,AC,2C,SNAP,04TH,IEC,10A TIE,CABLE,NYL,.14X5 5 8 CLIP,WIRE HRNS,.15DIA,ADH B K BUMPER,FEET,,98DIAX.2,RVT MTG KNOB,1.25,6MM FL,BLK INSUL SPACERS 630-07846 SPCR,PCB FOOT,.250,NYL 630-09983 INSUL,SEMI,SIL RUB,ADH,1.95X1 630-11229 GASKET,BUTTONS,DC-1 630-11233 SPCR,SNAP-IN,.18DX1,25L,NYL 635-10970 SPCR,2-56X3 16,1 8HEX,S,ZN MACHINE SCREWS 640-01700 SCRW,4-40X1 2,PNH,PH,SS 640-09698 SCRW,2-56X5 8, PNH, PH,ZN 640-10467 SCRW,M3X6MM,FH,PH,BZ 640-10489...

Monitoren

Monitor input-select audio multiplexer enable Monitor input-select audio multiplexer control bits Monitor input-select video multiplexer control bits Monitor input-select luminance multiplexer enable Serial-control chipselect, video OSD Output Volume Control Serial-control select

Mosiihao

The 56004 receives and transmits 24-bit words. Every time the Z80 initiates a serial transfer, the 56004 simultaneously clocks in the receive word and clocks out a transmit word. When HREQ is asserted low, it indicates that the 56004 is ready to receive and transmit data. This interface has independently programmable receive and transmit sections. The SAI receive section runs in slave mode with 4FS as the framing signal and 256FS as the bitclock. This provides for eight time slots which...

Notes

1 UNLESS OTHERWISE INDICATED, RESISTORS ARE 1 1OW 2 UNLESS OTHERWISE INDICATED, RESISTORS ARE 5 3 UNLESS OTHERWISE INDICATED, CAPACITORS ARE UF V 4 DIGITAL ANALOG J_ CHASSIS I POWER 777 GROUND v GROUND GROUND GROUND 5 XX XX DENOTES SHEET NUMBER SECTOR I 6 LAST REFERENCE DESIGNATORS USED BAT 1, C339, CP2, D49 , FB24, J20, PI, DIE R37I, RY4, SW12, U100, VRC6, W8, Y6 7 U77 IS A 27C010 FOR BASE 8, THX VERSIONS 27C020 FOR AC-3 VERSION ONLY. DOCUMENT CONTROL BLOCK 8060-10448 Sheet number- revision...

O

ON OFF alternately puts the DC-1 into and out of standby mode. Turning the DC-1 off with this button (or with the remote) deactivates the unit while leaving power to the signal processing circuitry to keep it at optimum operating temperature. Turning the DC-1 on with this button (or the remote) will restore the previous operating state. Pressing any of these buttons (VCR1, VCR2, V DISC, TV, AUX, CD, TUNER, TAPE) selects the Input at the corresponding rear panel connector as the current input...

Record Output Disabled

To assign a different input via the front panel, simultaneously press REC ZONE 2 and the desired input selector. To change the input assignment via the remote, first de-assign the current input by holding down the RECORD ZONE 2 key, then press the desired input selector. This will change the input assignment for the Main outputs. Assign this new input to the Record Zone 2 outputs by pressing and holding RECORD ZONE 2. As protection against feedback, the TAPE and VCR1 inputs are normally blocked...

Serial Boot Mode

Two interrupts are provided between the Z80 and the 56004.56004_NMI goes to the non-maskable input which is edge sensitive. To interrupt the 56004, the Z80 clears the bit and then immediately sets it high again. This bit is high when the 56004 comes out of reset to select serial boot mode. The second Z80 control bit, 56004J RQB , is cleared low before the 56004 is released from reset to select serial boot mode. It is then set high again during run time. To interrupt the 56004, the Z80 clears...

Sram

When Q8 turns on to unprotect the SRAM, it also turns on Q9, which switches BAT_VCC to +5VD. When protection is re-entered, Q9 turns off, leaving BAT_VCC near 5 V, held up by C280. The RAM CS1 and VCC pins are nevertheless equal, because there is no current through R228. This remains true as BAT_VCC decays and ultimately gets maintained by the battery. During normal operation, the SRAM VCC is close to the 5VD that supplies all the other logic. This design supports an upgrade path to...

W3

One of two circuit topologies may be found in a particular DC-1. The specific topology can be determined by checking if ferrite beads or 5.1 2 resistors are installed in locations FB1 and FB2. The following table gives an indication of output voltage and drive capability for each topology. 1. Enter the Extended Diagnostics mode. 2. Press TV on the remote to enter the Video Test. 3. Press MENU . The output frequency at TP2 on the Video board becomes the NTSC calibration frequency. 4. Set the...

Z80 Interrupt

Program ROM has an address range of 18 bits, comprised of 15 bits from the (sheet 1) Z80 address bus and 3 bits derived from a programmable bank-select register. Bank-select bits are placed in the Z80 l-register and appear on the upper half of the address bus during the refresh phase of every instruction fetch. The bits are latched by U70 and U76 when ZMREQ and ZRFSH are both low. U71 gates the latched bits with Z80 address bit 15 to form the address bits 17,16 and 15 of ROM U77. When the Z80...

Zone 2 Mode Enabled Key Invalid

To exit Zone 2 Remote mode and return the remote control to normal operation, press and hold ACCY while pressing SELECT. The message NORMAL IR REMOTE MODE ENABLED will be displayed to confirm that normal operation has been restored. The DC-1 can also be used as an exclusive Zone 2 controller, allowing remote use of the system while the local room (the room in which the DC-1 is located) remains muted. To use the DC-1 in this manner, turn on the DC-1 by pressing the RECORD ZONE2 key on the...

Dc1

Minimum Input Level 500 mVrms for maximum output 200 mVrms for Dolby level (Input Gain 0dB) Input Impedance 100 kQ in parallel with 150pF Video 5 composite (RCA), 3 S-video, NTSC, PAL, SECAM compatible Input Level and Impedance 1Vpp, 75Q Digital 4 2 coaxial (RCA), 2 optical (TOSLINK ), conforms to S PDIF standard Outputs Audio 8 outputs Left, Center, Right, L& R Sides, L& R Rears, Subwoofer (RCA) Maximum Output Level minimum 6 Vrms (System Volume +12dB) Output Impedance 100 Q in parallel...

4

There are two sets of DC-1 Diagnostics Power On Diagnostics, and Extended Diagnostics Diagnostics. Power On Diagnostics are automatically executed each time power is applied to the DC-1 via the rear panel Power switch. Extended Diagnostics are not automatically executed, but can be invoked by the user for specific purposes. Extended Diagnostics include additional tests to verify front panel controls, infrared communications, and audio and video performance, as well as those used to troubleshoot...

Rom Banko

The Z80 runs off a 10MHz crystal oscillator, the Lexichip off a 22.9MHz crystal, Lexichip WCS (512fs, fs 44.1 kHz + 1.42 ). The Z80 and Lexichip communicate asynchro- (sheets 1& 6) nously, which has the following implications. Wait states are imposed on the Z80 to ensure successful A-phase access of the Lexichip. Two wait states lengthen the Z80 write strobe to three T-states (300ns), which covers the worst-case requirement of five Master Clock periods (218ns). The two wait states are...

8

Clean, antistatic, well lit work area High quality music source playback system Compact Disc Player with stereo amplifier and 2 full range stereo speakers Audio patch cables 2 single-ended,shielded audio cables with RCA plugs on both ends for connecting the outputs of the compact disc player to the inputs of the DC-1 2 single-ended shielded audio cables with RCA plugs on one end and appropriate connectors on the other end for connection to the input of the stereo amplifier. Low Distortion...

Power

Each video input is terminated with 75Q to ground. The terminated signals are applied in parallel to both the monitor and record input multiplexers (sheets 1,2). The monitor circuitry (sheet 1) and record circutry (sheet 2) have many common features. The main difference is that the monitor path includes the OSD. The DC-1 has 5 composite video inputs and 3 S-video inputs. Composite video (CV) and S-video luminance (SY) are selected by one 8-input multiplexer U6 (74HC4051). The multiplexer...

Aux Cd Tuner Tape

Deactivate Zone 2 Control ' and restore normal operation Remote Trigger ON 5dB Volume Step Remote Trigger OFF Press and hold ACCY while pressing DONE to activate a You Are Here mode which Disables mute Sets volume to -30dB Centers Balance controls Loads the Pro Logic Effect Selects the VCR1 input Sets all tone controls to OdB or OFF Location The dC_- s a highly specialized signal processing computer and requires Considerations special care during installation to ensure optimum performance. The...

1

There is one ZCLK cycle from the Lexichip per four MC cycles ZCLK is logically sheet 6 LEXPHASEAB. Inverted, it becomes LEXPHASECD, which is used to latch the Z80 address and is clocked by MC in the LEXI GAL to create LEXPHASEDA. These two signals enable the detection of the Lexichip instruction phase. The Lexichip is slaved to an external asynchronous word clock. It is synchronized in the LEXI GAL U90 . The incoming word clock FS is first clocked by MC. The resulting signal FSD is then...

C

Ado r100 sheet 3 per eco 9 60126 01 update signal names per ocr 560314-00 unless otherwise indicated, resistors are 1 1 oh unless otherwise indicated, resistors are 5 5 ixx xx denotes sheet number sector j 6 last reference designators used on video board c49, 014, fb2, j8, li, c r100, tp6, u1s, y3 CxJCumSNT C NTR l bl ck b i -i 4 5

Ground The Instrument

To minimize shock hazard the instrument chassis and cabinet must be connected to an electrical ground. The instrument is equipped with a three-conductor AC power cable. The power cable must either be plugged into an approved three-contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet. The power jack and mating plug of the power cable meet International...

Lexicon Dc-1 Service Manual

Parts Grounded Conductors

Save these instructions for later use. Follow all instructions and warnings marked on the unit. Always use with the correct line voltage. Refer to the manufacturer's operating instructions for power requirements. Be advised that different operating voltages may require the use of a different line cord and or attachment plug. Do not install the unit in an unventilated rack, or directly above heat producing equipment such as power amplifiers. Observe the maximum ambient operating temperature...