Cyrus CD6s Service Manual

SERVICE MANUAL

SPECIFICATIONS

Audio output 2.1Vrms

Frequency response 20Hz-20kHz

Distortion <0.002%, (ref. 1kHz, 0dB)

S/N ratio 110dBA

Dynamic range >100dB (20Hz-20kHz)

Channel separation >110dB (1kHz), >90dB (20kHz)

Digital output Optical SPDIF

Clock jitter <100ps

Dimensions (H x W x D) 73 x 215 x 360 (mm), 2.8 x 8.4 x14.1 (inches)

Weight 3.1kg

CYRUS CD6s

CD PLAYER

59:57

CD 6 s

CYRUS CD6s SERVICE CAUTIONS

These two symbols shown are displayed prominently on the Cyrus CD6s base cover label. They indicate that the following cautions must be observed by all personnel-

CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER OR BACK.

THERE ARE NO USER SERVICEABLE PARTS INSIDE THE PRODUCT.

ALWAYS REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CAUTION! LIVE MAINS VOLTAGES!

When undertaking any work on the CD6s, engineers should observe that exposed live mains voltages exist on the PCB attached to the mains inlet socket. For safety, this area must be securely insulated with insulation tape during all repair work.

STATIC PRECAUTIONS

When servicing any Cyrus product, adequate care must be taken during any service work to observe static precautions, particularly when storing, handling or fitting replacement components. The following guidelines must be observed –

• Check that all component purchases are delivered in static-safe packaging.

• Store all components in a static-safe environment.

• Always wear a grounding strap and work on a grounded bench when handling

components or servicing a product. Static damage may not be immediately obvious and may result in a delayed action component/product failure.

CYRUS CD6s SERVICE CAUTIONS

The notice below shows the position of caution labels which alert the service technician to the presence of a laser device –

CLASS 1

LASER PRODUCT

CAUTION!

VISIBLE AND INVISIBLE LASER

RADIATION WHEN OPEN. AVOID

DIRECT EXPOSURE TO BEAM

CYRUS CD6s SERVICE MANUAL INDEX

INDEX

SMD component replacement......................2

Type identification .......................................4

Block diagram ..............................................5

Technical description ...................................6

Fault finding/disassembly ............................8

Alignment...................................................10

Control software.........................................11

Use with a PSX-R.......................................12

MCBus operation .......................................13

Chassis parts drawing.................................14

Chassis parts list......................................... 16

Front panel parts drawing/list..................... 17

PCB parts lists ............................................18

Circuit diagrams .........................................26

CYRUS CD6s SMD COMPONENT REPLACEMENT

Handling

SMD resistors and capacitors are widely used in the Cyrus range of products. When handling SMD components, certain precautions should be observed-

Handling SMD resistors and capacitors

• Always store SMD components in their original packaging or in a cool dry environment.

• Always handle SMD resistors and capacitors with tweezers or a vacuum pencil.

• Never handle SMD resistors and capacitors with fingers.

• Hold the SMD component by the body, not by the ends.

• Do not use SMD resistors or capacitors if the ends are dirty or discoloured.

• Do not use SMD resistors or capacitors if they have been dropped on the floor- they may be

internally damaged.

• Always use replacement components of the correct size and shape. SMD components are

available in many different packages. Where possible, order original parts from Cyrus.

Handling SMD ICs

• Always store these components in their original packaging or in a cool dry environment.

• Always handle SMD transistors and ICs with tweezers or a vacuum pencil.

• Never handle SMD transistors and ICs with fingers.

• Ensure that the connection pins of larger multi-pin ICs are not deformed or damaged before

fitting.

Measuring circuits with SMD capacitors and resistors

• Avoid using sharp, pointed probes directly on the component end caps.

• Measure voltages from the PCB pad next to the component.

Static precautions SMD components, particularly ICs, may be damaged by the static levels present in the

workshop. Damage caused by static may not immediately cause component failure but could cause partial damage and a possible failure in the future. Observing these simple SMD precautions will avoid product failures related to static damage-

• Always wear a grounded wristband when replacing any electronic components.

• Always store components in their original packaging or conductive plastic bags.

• Never store components in plastic trays or bags without protection.

Soldering/desoldering SMD components

• Never re-use old SMD components after de-soldering!

• Always apply solder heat directly to the contact area. Avoid over-heating adjacent

components.

• Always repair SMD PCBs with the correct tools. SMD components can only be replaced

with a hot air pencil or soldering iron designed for SMD components, preferably with temperature control.

• Keep the soldering temperature as low as possible. 260ºC is recommended for SMD rework.

Most SMD components will withstand 260ºC for 5 to 10 seconds

• Use tin/lead/silver solder which has a lower melting point (about 179ºC). Tin/lead/silver

solder paste or small gauge solder (26SWG) is recommended.

CYRUS CD6s SMD COMPONENT REPLACEMENT

• When using solder paste a pressure dispenser should be used to ensure the correct amount of

solder is applied to each pad.

• Solder paste should not be used with direct heating methods as the solder between

component pins may not be melted.

• If necessary, remove excess solder paste with solder braid. Removing SMD resistors and capacitors from the PCB with a soldering iron

1. Fit the soldering iron with a tip large enough to bridge both ends of the component.

2. Place the soldering iron so that its flat tip will heat both ends of the component at once.

3. When the solder melts, remove the component with tweezers.

4. Allow the PCB to cool for a few minutes, removing any excess solder with desoldering braid.

Fitting replacement SMD resistors and capacitors to the PCB with a soldering iron

1. Apply a little flux to the connections.

2. Place the component in position.

3. Tin the soldering iron, bring the tip into contact with the PCB pad and flow solder to the joint. Avoid bringing the soldering iron tip directly into contact with the component.

Removing SMD ICs from the PCB

1. Using fine tipped side cutters or tweezer cutters, snip all the leads of the device and remove the IC body.

2. Desolder the leads from the PCB pads.

3. Clean up the PCB with solder braid.

Removing SMD ICs with a hot air SMD tool

1. Fit a suitable size tip for the IC being removed.

2. Heat the IC evenly until the solder melts.

3. Remove the IC with tweezers.

Fitting replacement ICs to the PCB with a soldering iron

1. Check that the pins of the IC are not distorted.

2. Using tweezers, position the IC over the footprint.

3. Check that all the IC pins are correctly aligned with the pads.

4. With a very fine tip soldering iron, solder in the pins at the corners of the IC.

5. Re-check the alignment and correct if necessary.

6. When the alignment is OK, solder the remaining pins of the IC to the PCB.

CYRUS CD6s TYPE IDENTIFICATION

Rating label

Each Cyrus CD6s carries a rating label on the rear panel, which includes details of the following:

Nominal power voltage This will be either 230V For use on nominal 220V - 240V AC mains supply.

115V For use on nominal 110V - 120V AC mains supply.

Power consumption The power consumption figure is indicated under normal working conditions.

Serial number

Each Cyrus CD6s carries a serial number code, which identifies the following-

• Type of product

• Market destination

• Build number

• Paint finish (colour)

The serial number is on the baseplate. It is therefore important to ensure that a baseplate removed from a product is re-fitted to the same product. In any communications with Cyrus Service or Quality departments it is essential that the full serial number is quoted so that original specification parts and service information may be supplied.

PCB Identification

The Cyrus CD6s PCB is marked with a design revision number and this number should be quoted in all correspondence to the service department when requesting technical advice or requesting spare parts. The table below shows the PCB markings.

Revision number PCB marking

Main board revision 2 IS101332

CYRUS CD6s BLOCK DIAGRAM

RAD

FOC

MOT

AM2088

TDA1300

SAA7327

BCLK

WCLK

DATA

XCLK

DSA

KEYS

DISPLAY DATA

SPI

H8/3644

Microcontroller

74HC14

Buffer

74HC4046

PLL

74HCT86

Data buf fer

and

74HC574

Latch

DAC

PCM1738

LCD

Keys

IC502

IC204

IC202

IC201

/Reset

IC503

DS1811R-15

IC301

IC501

MC BUS

SPDIF ( )

OPTICAL

IC101

AK4103

Main PCBServo

PCB

CYRUS CD6s TECHNICAL DESCRIPTION

Cyrus CD6s PCB assemblies The following is a brief description of the two internal PCBs found in the CD6s. The servo PCB is located just under the base plate, this includes the CD tray motor and sled

drivers, the laser servo microcontroller and CD decoder. The main PCB is mounted under the servo PCB in the base of the chassis and contains

regulated power supplies, DtoA converter, optical SPDIF output and the user interface microcontroller.

Microprocessor control system System control for the CD6s is provided by microcontroller IC502 (H8/3644). The

microcontroller accepts external user commands (IR handset, front panel keys and MCBus loop) and translates them into instructions that operate the CD mechanism, via the servo PCB.

The microcontroller communicates with the servo PCB via the bi-directional serial data bus (marked ‘DSA’ on the circuit diagrams), where the operational status of the CD mechanism is communicated back to the microcontroller and displayed on the LCD.

IC503 (DS1811R-15) is a power supply voltage supervisor for the microcontroller. If the power supply voltage drops below 4.3V it will reset the microcontroller.

Control Software The software contained in the microcontroller is electrically programmed into the internal flash

memory when the CD6s are manufactured. This software may be updated at an authorised Cyrus service centre as later versions are released.

Note. If IC502 is replaced for any reason, new software must be installed after the replacement microcontroller is fitted.

The software version may be checked from the front panel of the CD6s by using the following key sequence -

1. Connect power to the CD6s and set to Standby (power light red).

2. Press and hold the Standby key.

3. The software version and release date will be shown on the display.

Disc reading/decoder module and servo PCB The disc reading laser pickup is a Philips VAM1202/12 mounted in a motor driven tray loader,

which receives its operating commands via the servo PCB. Note. The laser pickup and servo PCB are not serviceable items. If either of these parts is

defective it must be replaced with original parts from the Cyrus spares department.

Digital to Analogue conversion The digital audio data from the servo PCB is fed to the main PCB via cable assembly CON102.

The data is then buffered by IC201 (74HCT86) and reformatted by IC202 (74HC574) before being input to the DAC (IC301 (PCM1728)). The balanced DAC outputs are passed through I/V converters IC302/3 (BA5523) and then buffered by IC304 (OPA2134) to the left and right audio outputs.

CYRUS CD6s TECHNICAL DESCRIPTION

The DAC master clock is generated by the PLL circuit IC204 (74HC4046) and divided by shift register IC205 (74HC161). O/P Pin11 (÷16) XCLK/8 = 2.1168MHz.

O/P Pin14 (÷2) XCLK = 19.99344MHz.

The DAC regulated power supplies are derived from the low voltage secondary windings: +5V (VR604) and +3.3V (VR301).

Digital Optical output The reformatted data from IC202 (74HC574) is converted to SPDIF format by the digital audio

output encoder IC101 (AK4103) then fed to the optical output (TOTX101).

Power supplies The internal regulated power supplies for the Cyrus CD6s are derived from the high and low

voltage secondary windings from a single toroidal transformer. The low voltage windings supply regulated +5V supplies to digital circuitry including the PLL, DtoA converter, microcontroller and CD mechanism.

The high voltage windings supply regulated ±15V supplies to the analogue audio stages and a +9V supply to the servo control motors for CD mechanism.

Front panel display The front panel display is a backlit LCD module mounted in a moulding behind the front panel.

The LCD module is driven by signals from microcontroller IC502 pins 52 and 53 (LCD_DATA and LCD_SCLK). IC502 also reads back an analogue voltage encoded from keys pressed on the front panel (via KEYS_IN1 pin 64), and remote control information from the eye via line REMOTE_IN pin 43.

+ 24 hidden pages

Cyrus CD6s Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual