0000 1111

When troubleshooting any kind of equipment, intermittent problems are among the most difficult to trace. The first step when troubleshooting any problem is to collect as much information as possible. The following table outlines some basic questions which should be answered before attempting to troubleshoot an analog problem on the CP-3. (Additional troubleshooting techniques can be found in the Diagnostics section earlier in this chapter.) 2. at only certain signal frequencies 3. at only...

0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110

A 500ns low pulse should be present on the CONTRAST line each time the binary value to U37 changes. While pressing and holding the VOLUME or VOLUME keys, this amounts to 16 pulses before the maximum value is reached. The presence of this pulse can be checked with Pulse Detector (LEX 770-90025) or with a scope set for NORM (manual) trigger level set at 2.5VDC. The IR Remote test is a utility program that allows the CP-3 to identify and display the key being pressed on the infrared remote. The...

0111

The MDACs are typically tested by keeping one MDAC element fixed, sending the values shown above to the other element, then checking the resulting gain. The test is started by setting both of the MDACs to unity gain (both elements at ff), and taking a reference of the output level. The MDAC under test is then sent each value shown above, and the resulting gain is checked against the limit. Always return the value to ff before you step to the next MDAC. Troubleshooting the MDACs is fairly...

1

DATA X DATA BIT 0 X DATA BIT 1 X DATA BIT 2 Xj j 6 X DATA BIT 7 X Input Switching input composite video signals can be accepted from three different devices via three switchable input jacks. These inputs are numbered 1-3 and are configured in such a way that they change with the audio inputs. There are four audio inputs versus three video inputs. Audio inputs 1 -3 relate to the corresponding video inputs. If audio input 4 is selected, video input 1 is selected by default. If the CP-3 is turned...

10k 20k

Three SSM2402 analog switches (U220,223,232) are used to choose the signals that will be routed to the left and right outputs. The choices are the direct input signals (LINHP, RINHP), the left and right primary processed outputs (LFrt, RFrt), and the re-equalized primary processed outputs. Two dual op amps (Left U219 Right U231) are configured as summing amps for the three signals from the switches, thereby allowing any combination of the signals to be chosen. The switches are closed by a +5...

1k

Master Z80 Access In order to access Slave RAM and the Lexichip (U30) WCS, the Master Z80 to Slave Z80 Circuitry loads program code from the ROM to the Slave RAM and the Lexichip. The Master Z80 can access Slave circuitry only when 2. Slave Z80 is in the last two clock periods of an instruction fetch operation. (Refresh period) The Master Z80 accesses the Slave Z80 via the Dual Bus Interlace and the Master Buffer (U26-U29, U36) and two PLDs (U13 and U16, GAL16V8,1 B7 and 3 B5). The Slave Z80...

3

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311

Dolby Filter Test This test verifies the functionality of the Rear Left and Right Dolby Filter circuits by checking gain, THD+N, and S N Ratio. Frequency response is not checked as part of this performance verification due to the complexity of the 1. Attach the audio input cable between the Low Distortion Oscillator and the CP-3 Right channel Input 1 jack. 2. Attach the audio output cable between the CP-3 Right Rear Output jack and the input of the Distortion Analyzer. 3. Verify that Input 1 is...

CP3 Master Slave Interface

Master Z80 requests Slave bus access. Decoding circuitry returns a wait signal to the Master Z80 until Slave bus is available. No wait signal is necessary if the Slave Z80 is in Reset. Decoding circuitry asserts the Access signal, removes the wait signal and the Master Z80 gains access to the Slave bus. Access Decoding SLVRAM and LEX are generated by the MasterSiavedecoder(U13).These signals are activated for either processor to access Slave RAM or the Lexichip. When access to the shared Slave...

Digital Circuit Description

Overview The CP-3 Digital board contains both digital and video circuitry. Both, therefore, will be discussed in this section. The CP-3 utilizes two 280 microprocessors (Master and Slave) and the Lexichip Digital Signal Processor (DSP) to perform multiple digital audio effects. These effects are controlled via the front panel user interface or the Standard Expanded remote controls. Each Z80 processor has it own support circuitry, data and address busses. Although each processor is capable of...

Fproc Enable On

Procedure for Front L & R Outputs 1. Apply a 1 kHz signal at +4 dBV (1.58 Vrms) to the CP-3 right input. 2. Set the scale on the Distortion Analyzerto measure +4 dBV (1.58 Vrms) signal level. 3. Verify the output level from the CP-3 is +4 dBV (1.58 Vrms) + -0.5 dB. 4. Adjust the scale on the Distortion Meterto measure 0.025 THD+N and turn on the 30 kHz low pass or audio bandpass filter. Verify that THD is less than 0.025 . 5. Set the oscillator's output level to -10 dBV (316 mVrms). 6....

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...

Info

Select any of these tests to run individually. Clear Non- Slave RAM Volatile RAM Slave WCS Non-Destructive Slave Reset Clear Non- Slave RAM Volatile RAM Slave WCS Non-Destructive Slave Reset To enable Remote keys, hold down any key on the Remote while powering up. To enable Remote keys, hold down any key on the Remote while powering up. Because the development of user presets forthis product is often difficult, and there is no way to back them up, it is desirable to preserve them if possible....

MSYNC Signaling

MSYNC is asserted during a Master Z80 I O write operation. As a result of MSYNC input, Slave Decoder asserts MWAIT until WCE is asserted. C WC is asserted and is extended to produce WCE D On rising edge of ZCLK, Slave Decoder, seeing WCE active, removes MWAIT signal. On rising edge of ZCLK, Master Z80 sees MWAIT removed and finishes the instruction. One wait state is assserted automatically by Z80 during I O operations. Additional wait states ocur if MWAIT is asserted. The Lexichip (U30,4...

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The Expanded Remote

The CP-3 can operate in one of four modes (PANORAMA, AMBIENCE, REVERB, or SURROUND). Each of these modes has a set of preset variations as listed on the Expanded remote (1-15). As many as 30 customized versions of these presets can be stored in User Registers. Allows selection and adjustment of all the interface functions of the CP-3 including Input and Output levels, visual displays, speaker configurations, etc. Saves in memory the settings from the SETUP mode and is used to memorize and store...

The Front Panel

The four INPUT buttons are used to select which input is processed by the CP-3. Pressing any one of these buttons will select that input and light the LED above it. The CP-3 can be programmed to engage a specific operating mode for each input, so changing inputs may change the mode being used. The INPUT LEVEL display monitors the level in the CP-3's digital encoding circuits and is used to indicate the correct Dolby level for video sound sources (marked by the double-D symbol between the LEDs.)...

The Standard Remote

The five operating mode buttons on the Standard Remote can be customized to load any of 45 operating modes. Turns off all outputs, lights both MAIN and EFX MUTE LEDs and displays SYSTEM MUTED. Pressing again will restore normal operation. (Because it is possible to alter the setting of the volume while Main Mute is on, check the volume before you turn the mute off again.) Turns off all signals added by the CP-3, lights the yellow EFFECTS MUTE LED on the front panel, and displays EFFECTS MUTED....

Video Calibration

Required Equipment Clean, antistatic, well lit work area 7-digit resolution with 10 MHz measurement capability Oscilloscope 1. Power off the CP-3 from the rear panel power switch. 2. Remove the CP-3 top cover (16 screws). Video HSYNC Free Running Frequency Adjustment Procedure 1. Install a jumper at W3 on the Digital board. 2. Power on the CP-3 from the rear panel power switch. 3. Connect the X1 probe from the frequency counter to TP1 on the Digital board. 4. For 100V-120V units, adjust R16 for...

Analog Circuit Description

Overview The CP-3 provides simultaneous switching capability for four stereo audio inputs and three composite video inputs. A single composite video output features an on screen display. The associated video overlay circuitry resides on the digital PC board and is described in the digital theory of operation. Eight audio outputs include left front, right front, center, subwoofer, two sides and two rears. Five outputs are created internally by time sharing two 16-bit digital-to-analog converters...

Power Supply Circuit Description

The CP-3 has an internal supply which produces the required DC supplies Overview from various line voltages. It may be strapped for line voltages of 100,120, 220 and 240 VAC at either50 or60 Hz. All DC voltages are produced by linear supplies. A bipolar 15 volt supply is required by the analog electronics and is regulated locally on the lower analog board. The digital and video electronics each require +5 volts. One regulator, located on the power supply board, is used for both supplies....

CP3 ROM Address Space

System ROM space. kXVI Jumpers W1 and W2 IN. System ROM space. KXX1 Jumpers W1 and W2 IN or OUT. Overlapping ROM space allocated for system code and diagnostic reset and interrupt vectors. V , Jumpers W1 and W2 OUT. Diagnostic code ROM space. This figure shows how the physical ROM space is split between the Diagnostic and System code. Shared space is used by the System code, except C000 -C08FH which is reserved for Diagnostic code Reset- and Interrupt- vectors. Master...

204vac

Return the Variac to nominal AC line voltage. 3. Return the Variac to nominal AC line voltage. Power off the CP-3 using the rear panel power switch. Measure the battery voltage at U33 pin 28 to ground and verify that it is > 2.50 VDC. Power on the CP-3 using the rear panel power switch. Alternately set the Variac to both extremes of the AC line voltage operating range given in Table 4.2 and verify that the regulated supply rails remain within their tolerance range. Then, return the Variac to...

CP3 Digital Circuitry Block Diagram

Z80 Diagram Blocks

During normal operation, sampled audio is converted into digital data by successive approximation A D converters. Digital effects processing is performed by the Lexichip under the control of both Master and Slave Z80 processors. The Lexichip controls not only the effects processing, but also the Analog-to-Digital and Digital-to-Analog conversions. The Master Z80, which handles all operator I O and housekeeping functions, is able to pass DSP control information to the other two processors. The...

Antenna Discharge Unit

Service Ground Electrode Location

Read Instructions Read all safety and operating Instructions before operating the unit. Retain Instructions Keep the safety and operating instructions for future reference. Heed Warnings Adhere to all warnings on the unit and in the operating instructions. Follow Instructions Follow operating and use instructions. Heat Keep the unit away from heat sources such as radiators, heat registers, stoves, etc., including amplifiers which produce heat. Ventilation Make sure that the location orposition...