Insert a CD. Playback starts automatically.

Labelled side up

CDX-C4850R/C4840R: Each time you press (DSPL) during CD or CD TEXT disc playback, the item changes as follows:
$ Track number/ Elapsed playback time $ Disc name*1/Artist name*2 $ Track name*1 $ Clock
If a CD is already inserted, press (SOURCE) repeatedly until CD appears to start playback.
CD indication Elapsed playing time
*1 If you inserted a non-CD TEXT disc, NO NAME appears in the display. *2 If you play a CD TEXT disc, the artist name appears in the display after the disc name. (Only for CD TEXT discs with the artist name.)
CDX-4260R/4250R/4240R/4250RV: Each time you press (DSPL) during CD playback, the item changes as follows:
Track number/Elapsed playing time Clock
Track number Note To play back an 8 cm CD, use the optional Sony compact disc single adapter (CSA-8).
To Stop playback Eject the CD

Press 6 or (OFF) 6

After you select the desired item, the display will automatically change to the Motion Display mode after a few seconds. In the Motion Display mode, all the above items are scrolled in the display one by one in order.
Tip The Motion Display mode can be turned off. (See Changing the sound and display settings on page 19).
Automatically scrolling a disc name Auto Scroll (CDX-C4850R/C4840R only)
If the disc name, artist name, or track name on a CD TEXT disc exceeds 8 characters and the Auto Scroll function is on, information automatically scrolls across the display as follows:
The disc name appears when the disc has changed (if the disc name is selected). The track name appears when the track has changed (if the track name is selected).
Locating a specific track Automatic Music Sensor (AMS)
During playback, push the SEEK/AMS control up or down and release for each track you want to skip.
To locate succeeding tracks
To locate preceding tracks
If you press (DSPL) to change the display item, the disc or track name of the CD TEXT disc is scrolled automatically whether you set the function on or off.
Locating a specific point in a track Manual Search
During playback, push the SEEK/AMS control up or down and hold. Release when you have found the desired point.

To search forward

During playback, press (SHIFT). Press (2) (SET UP) repeatedly until A.SCRL appears. Press (4) (n) to select A.SCRL-ON. Press (SHIFT).
To search backward Note If or appears in the display, that means you have reached the beginning or the end of the disc and you cannot go any further.

To cancel Auto Scroll, select A.SCRL-OFF in step 3 above.
Note For some CD TEXT discs with very many characters, the following cases may happen: Some of the characters are not displayed Auto Scroll does not work. Tip To manually scroll the long name of a CD TEXT disc after activating the Auto Scroll function , press (SHIFT), then (1) (N) (manual scroll).
Playing a CD in various modes
You can play CDs in various modes: REP (Repeat Play) repeats the current track. SHUF (Shuffle Play) plays all the tracks in random order.
Memorising stations automatically

Best Tuning Memory (BTM)

The unit selects the stations with the strongest signals and memorises them in the order of their frequencies. You can store up to 10 stations on each band (FM1, FM2, MW, and LW). Caution When tuning in stations while driving, use Best Tuning Memory to prevent accidents.
Playing tracks repeatedly Repeat Play
During playback, press (SHIFT). Every time you press (SHIFT), only the items you can select light up.
Press (6) (REP) repeatedly until REP-1 appears.
Press (SOURCE) repeatedly to select the tuner. Each time you press (SOURCE), the source changes as follows:

z TUNER z CD z MD*

Repeat Play starts.
* If the corresponding optional equipment is not connected, this item will not appear. (CDX-C4850R/C4840R only)
To return to normal playback mode, select REP-OFF in step 2 above.
Playing tracks in random order Shuffle Play
Press (MODE) repeatedly to select the band. Each time you press (MODE), the band changes as follows:

z FM1 z FM2 z MW z LW

During playback, press (SHIFT). Press (7) (SHUF) repeatedly until SHUF1 appears.
Press (SHIFT), then press (3) (PLAY MODE) repeatedly until B.T.M appears. Press (4) (n). The unit stores stations in the order of their frequencies on the number buttons. A beep sounds when the setting is stored. Press (SHIFT).

Shuffle Play starts.

To return to normal playback mode, select SHUF-OFF in step 2 above.
Notes The unit does not store stations with weak signals. If only a few stations can be received, some number buttons will retain their former setting. When a number is indicated in the display, the unit starts storing stations from the one currently displayed. If a CD is not in the unit, only the tuner band appears even if you press (SOURCE).
Memorising only the desired stations
You can preset up to 20 FM stations (10 each for FM1 and 2), up to 10 MW stations, and up to 10 LW stations in the order of your choice.
Receiving the memorised stations
Press (SOURCE) repeatedly to select the tuner. Press (MODE) repeatedly to select the band. Press the number button ((1) to (10)) on which the desired station is stored.

Press (SOURCE) repeatedly to select the tuner. Press (MODE) repeatedly to select the band. Push the SEEK/AMS control up or down to tune in the station that you want to store on the number button. Press and hold the desired number button ((1) to (10)) until MEM appears. The number button indication appears in the display.
If you cannot tune in a preset station
Push and release the SEEK/AMS control up or down to search for the station (automatic tuning). Scanning stops when the unit receives a station. Push the SEEK/AMS control up or down repeatedly until the desired station is received.
Note If the automatic tuning stops too frequently, press (SHIFT), then press (3) (PLAY MODE) repeatedly until LOCAL (local seek mode) is displayed. Then press (4) (n) to select LOCAL-ON. Press (SHIFT). Only the stations with relatively strong signals will be tuned in. Tip If you know the frequency of the station you want to listen to push the SEEK/AMS control up or down and hold until the desired frequency appears (manual tuning).
Note If you try to store another station on the same number button, the previously stored station will be erased.
If FM stereo reception is poor Monaural Mode
During radio reception, press (SHIFT), then press (3) (PLAY MODE) repeatedly until MONO appears. Press (4) (n) repeatedly until MONOON appears. The sound improves, but becomes monaural (ST disappears). Press (SHIFT).
Overview of the RDS function
Radio Data System (RDS) is a broadcasting service that allows FM stations to send additional digital information along with the regular radio programme signal. Your car stereo offers you a variety of services. Here are just a few: retuning the same programme automatically, listening to traffic announcements, and locating a station by programme type.
Notes Depending on the country or region, not all of the RDS functions are available. RDS may not work properly if the signal strength is weak or if the station you are tuned to is not transmitting RDS data.
To return to normal playback mode, select MONO-OFF in step 2 above.
Each time you press (DSPL), the item changes as follows:

Frequency Clock

Displaying the station name
The name of the current station lights up in the display. Select an FM station (page 9). When you tune in an FM station that transmits RDS data, the station name appears in the display.
Note The * indication means that an RDS station is being received.
Changing the displayed item
Frequency (Station Name) Clock
After you select the desired item, the display will automatically change to the Motion Display mode after a few seconds. In the Motion Display mode, all the above items are scrolled in the display one by one in order. continue to next page n

Tip The Motion Display mode can be turned off. (See Changing the sound and display settings on page 19). Note NO NAME appears if the received station does not transmit RDS data.
Each time you press (AF/TA), the item changes as follows:
TA-ON AF-ON AF TA-ON* AF TA-OFF
* Select this to turn on both the AF and TA functions. Notes When NO AF and the station name flash alternately, it means that the unit cannot find an alternative station in the network. If the station name starts flashing after selecting a station with the AF function on, this indicates that no alternative frequency is available. Push the SEEK/AMS control up or down while the station name is flashing (within eight seconds). The unit starts searching for another frequency with the same PI (Programme Identification) data (PI SEEK appears and no sound is heard). If the unit cannot find another frequency, NO PI appears, and the unit returns to the previously selected frequency.
Retuning the same programme automatically
Alternative Frequencies (AF)
The Alternative Frequencies (AF) function automatically selects and retunes the station with the strongest signal in a network. By using this function, you can continuously listen to the same programme during a longdistance drive without having to retune the station manually.
Frequencies change automatically.
Listening to a regional programme

98.5MHz 96.0MHz

Station

102.5MHz

The REG-ON (regional on) function lets you stay tuned to a regional programme without being switched to another regional station. (Note that you must turn the AF function on.) The unit is factory preset to REG-ON, but if you want to turn off the function, do the following.
Select an FM station (page 9). Press (AF/TA) repeatedly until AF-ON appears. The unit starts searching for an alternative station with a stronger signal in the same network.
During radio reception, press (SHIFT), then press (3) (PLAY MODE) repeatedly until REG appears. Press (4) (n) repeatedly until REG-OFF appears. Press (SHIFT). Note that selecting REG-OFF might cause the unit to switch to another regional station within the same network.
Note When there is no alternative station in the area and you do not need to search for an alternative station, turn the AF function off by pressing (AF/TA) repeatedly until AF TA-OFF appears.
To return to regional on, select REG-ON in step 2 above.
Note This function does not work in the United Kingdom and in some other areas.
Local link function (United Kingdom only)
The Local Link function lets you select other local stations in the area, even if they are not stored on your number buttons.
Listening to traffic announcements
The Traffic Announcement (TA) and Traffic Programme (TP) data let you automatically tune in an FM station that is broadcasting traffic announcements even if you are listening to other programme sources. Press (AF/TA) repeatedly until TA-ON or AF TA-ON appears. The unit starts searching for traffic information stations. TP appears in the display when the unit finds a station broadcasting traffic announcements. When the traffic announcement starts, TA flashes. The flashing stops when the traffic announcement is over.

Tip If the traffic announcement starts while you are listening to another programme source, the unit automatically switches to the announcement and goes back to the original source when the announcement is over. Notes NO TP flashes for five seconds if the received station does not broadcast traffic announcements. Then, the unit starts searching for a station that broadcasts it. When EON appears with TP in the display, the current station makes use of broadcast traffic announcement of other stations in the same network.
Press a number button that has a local station stored on it. Within five seconds, press the number button of the local station again. Repeat this procedure until the desired local station is received.
To cancel the current traffic announcement
Press (AF/TA) or (SOURCE). To cancel all traffic announcements, turn off the function by pressing (AF/TA) until AF TA-OFF appears.
Presetting the RDS stations with the AF and TA data
When you preset RDS stations, the unit stores each stations data as well as its frequency, so you dont have to turn on the AF or TA function every time you tune in the preset station. You can select a different setting (AF, TA, or both) for individual preset stations, or the same setting for all preset stations.
Presetting the volume of traffic announcements
You can preset the volume level of the traffic announcements beforehand so you wont miss the announcement. When a traffic announcement starts, the volume will be automatically adjusted to the preset level.
Select the desired volume level. Press (AF/TA) for two seconds. TA appears and the setting is stored.
Presetting the same setting for all preset stations
Select an FM band (page 9). Press (AF/TA) repeatedly to select either AF-ON, TA-ON or AF TA-ON (for both AF and TA functions). Note that selecting AF TA-OFF stores not only RDS stations, but also non-RDS stations. Press (SHIFT), then press (3) (PLAY MODE) repeatedly until BTM appears. Press (4) (n) until B.T.M flashes. Press (SHIFT).
Receiving emergency announcements
If an emergency announcement comes in while you are listening to the radio, the programme will be automatically switched to it. If you are listening to a source other than the radio, the emergency announcements will be heard if you set AF or TA to on. The unit will then automatically switch to these announcements no matter which source you are listening to at the time.

Presetting different settings for each preset station
Select an FM band, and tune in the desired station (page 10). Press (AF/TA) repeatedly to select either AF-ON, TA-ON or AF TA-ON (for both AF and TA functions). Press the desired number button until MEM appears. Repeat from step 1 to preset other stations.
Tip If you want to change the preset AF and/or TA setting after you tune in the preset station, you can do so by turning the AF or TA function on or off.
Locating a station by programme type
You can locate the station you want by selecting one of the programme types shown below. Programme types News Current Affairs Information Sports Education Drama Culture Science Varied Popular Music Rock Music Easy Listening Light Classical Classical Other Music Type Weather Finance Childrens programmes Social Affairs Religion Phone In Travel Leisure Jazz Music Country Music National Music Oldies Music Folk Music Documentary Not specified Display NEWS AFFAIRS INFO SPORT EDUCATE DRAMA CULTURE SCIENCE VARIED POP M ROCK M EASY M LIGHT M CLASSICS OTHER M WEATHER FINANCE CHILDREN SOCIAL A RELIGION PHONE IN TRAVEL LEISURE JAZZ COUNTRY NATION M OLDIES FOLK M DOCUMENT NONE
Press (PTY/LIST) during FM reception until PTY appears.
The current programme type name appears if the station is transmitting the PTY data. - - - - - appears if the received station is not an RDS station, or if the RDS data has not been received.
Press (PTY/LIST) repeatedly until the desired programme type appears. The programme types appear in the order shown in the above table. Note that you cannot select NONE (Not specified) for searching.
Push the SEEK/AMS control up or down. The unit starts searching for a station broadcasting the selected programme type. When the unit finds the programme, the programme type appears again for five seconds. NO and the programme type appear alternately for five seconds if the unit cannot find the programme type. It then returns to the previous selected station.
Note You cannot use this function in some countries where no PTY (Programme Type selection) data is available.
Setting the clock automatically
The CT (Clock Time) data from the RDS transmission sets the clock automatically.
You can also control this unit with an optional rotary commander.
During radio reception, press (SHIFT), then press (2) (SET UP) repeatedly until CT appears.

Labelling the rotary commander
Depending on how you mount the rotary commander, attach the appropriate label as shown in the illustration below.
Press (4) (n) repeatedly until CT-ON appears. The clock is set.
Press (SHIFT) to return to the normal display.

LIST MODE SOUND

To cancel the CT function
Select CT-OFF in step 2 above.
Notes The CT function may not work even though an RDS station is being received. There might be a difference between the time set by the CT function and the actual time.

SOUND MODE LIST

Using the rotary commander
The rotary commander works by pressing buttons and/or rotating controls. CDX-C4850R/C4840R only: You can also control optional CD or MD units with the rotary commander.
By rotating the control (the SEEK/AMS control)
By pressing buttons (the SOURCE and MODE buttons)

(SOURCE)

(MODE)
Rotate the control momentarily and release it to: Locate a specific track on a disc. Rotate and hold the control until you locate the specific point in a track, then release it to start playback. Tune in stations automatically. Rotate and hold the control to find a specific station.
By pushing in and rotating the control (the PRESET/DISC control)
Each time you press (SOURCE), the source changes as follows:
TUNER n CD n MD* * If the corresponding optional equipment is not connected, this item will not appear. (CDX-C4850R/C4840R only)
Pressing (MODE) changes the operation in the following ways;
Tuner: CD unit: MD unit: FM1 n FM2 n MW n LW CD1 n CD2 n MD1 n MD2 n
Push in and rotate the control to: Receive the stations memorised on the number buttons. Change the disc. (CDX-C4850R/C4840R only)

Other operations

Rotate the VOL control to adjust the volume. Press (ATT) to attenuate the sound.
Adjusting the sound characteristics
You can adjust the bass, treble, balance, and fader. You can store the bass and treble levels independently for each source.
Press (OFF) to turn off the unit. Press (SOUND) to adjust the volume and sound menu.
Select the item you want to adjust by pressing (SOUND) repeatedly. VOL (volume) n BAS (bass) n TRE (treble) n BAL (left-right) n FAD (front-rear)
Adjust the selected item by rotating the dial. Adjust within three seconds after selecting the item. (After three seconds, the dial function reverts to volume control.)

If you press (DSPL) to change the display item, the disc or track name of the MD or CD TEXT disc is scrolled automatically whether you set the function on or off.
Note For some CD TEXT discs with very many characters, the following cases may happen: Some of the characters are not displayed Auto Scroll does not work. Tip To manually scroll the long name of an MD or CD TEXT disc after activating the Auto Scroll function, Press (SHIFT), then (1) (N) (manual scroll).
Playing tracks repeatedly

Repeat Play

You can select: REP-1 - to repeat a track. REP-2 - to repeat a disc.
To locate succeeding tracks To locate preceding tracks
During playback, press (SHIFT). Press (6) (REP) repeatedly until the desired setting appears.
z REP-1 z REP-2 REP-OFF Z
To search forward To search backward
Locating a disc by disc number Direct Disc Selection
Press the number button that corresponds with the desired disc number. The desired disc in the current unit begins playback.
You can select: SHUF-1 - to play the tracks on the current disc in random order. SHUF-2 - to play the tracks in the current unit in random order. SHUF-ALL - to play all the tracks in all the units in random order.
During playback, press (SHIFT). Press (7) (SHUF) repeatedly until the desired setting appears.
z SHUF-1 z SHUF-2 SHUF-OFF Z z SHUF-ALL*
* SHUF-ALL is available for CD changer(s) only.

Labelling a CD Disc Memo

(For a CD unit with the custom file function)
You can label each disc with a personalised name. You can enter up to eight characters for a disc. If you label a CD, you can locate the disc by name (page 24) and select the specific tracks for playback (page 24).

Displaying the disc memo

Press (DSPL) during CD or CD TEXT disc playback.
Each time you press (DSPL) during CD or CD TEXT disc playback, the item changes as follows:
$ Track number/ Elapsed playback time $ Disc memo name
Play the CD and press (PTY/LIST) for two seconds.
Enter the characters. 1 Rotate the dial clockwise to select the desired characters. (A n B n C n Z n 0 n 1 n 2 n 9 n + n n * n / n \ n > n < n.n_)

$ Track name* $ Clock

If you rotate the dial counterclockwise, the characters will appear in reverse order. If you want to put a blank space between characters, select _ (underbar). 2 Press (4) (n) after locating the desired character. The flashing cursor moves to the next space.
* If you connect an optional CD unit with the CD TEXT function, the CD TEXT information will appear in the display when you play a CD TEXT disc.

Erasing the disc memo

Press (SOURCE) repeatedly to select CD. Press (MODE) repeatedly to select the CD unit. Press (PTY/LIST) for two seconds. Press (DSPL) for two seconds. Rotate the dial to select the name you want to erase. Press (5) (ENTER) for two seconds. The name is erased. Repeat steps 5 and 6 if you want to erase other names. Press (PTY/LIST) for two seconds. The unit returns to normal CD playback mode.

If you press (1) (N), the flashing cursor moves to the left. 3 Repeat steps 1 and 2 to enter the entire name.
To return to normal CD playback mode, press (PTY/LIST) for two seconds.
Tip To erase or correct a name, enter _ (under-bar) for each character.
Note When a personalised label is erased, the original CD TEXT information will appear in the display.

Locating a disc by name

List-up (For a CD unit with the custom file function or an MD unit )
You can use this function for discs that have been assigned a custom name. For more information on disc names, refer to Labelling a CD (page 23).
Selecting specific tracks for playback
Bank (For a CD unit with the custom file function)
If you label the disc, you can set the unit to skip or play the tracks of your choice.
Press (PTY/LIST). The name assigned to the current disc appears in the display.
Start playing the disc and press (SHIFT), then press (3) (PLAY MODE) for two seconds.

Bank edit mode.

When you assign a disc memo label to a CD TEXT disc, it takes priority over the original CD TEXT information.
Note If you have not labelled the disc, the bank edit mode does not appear. To go back to normal playback mode, press (SHIFT).
Press (PTY/LIST) repeatedly until you find the desired disc. Press (5) (ENTER) to play the disc.
Push the SEEK/AMS control up or down to select the track number you want to skip and press (5) (ENTER).
Notes After a disc name has been displayed for five seconds, the display returns to normal playback mode. To turn off the display, press (DSPL). The track names are not displayed during MD or CD TEXT disc playback. If there are no discs in the magazine, NO DISC appears in the display. If a disc has not been assigned a custom file, ******** appears in the display. If the disc information has not been read by the unit, NOT READ appears in the display. To load a disc, first press the number button, then choose the disc that has not been loaded. There are also some letters which cannot be displayed (during MD or CD TEXT disc playback).
The indication changes from PLAY to SKIP. To return the indication to PLAY," press (5) (ENTER) again.
Repeat step 2 to set PLAY or SKIP for all the tracks. Press (3) (PLAY MODE) for two seconds. The unit returns to normal CD playback mode. Press (SHIFT).

Notes You can set PLAY or SKIP for up to 24 tracks. You cannot set SKIP for all the tracks on a CD.
Playing specific tracks only
You can select: BANK-ON - to play the tracks with the PLAY setting. BANK-INV (Inverse) - to play the tracks with the SKIP setting.

Precautions

If your car was parked in direct sunlight resulting in a considerable rise in temperature inside the car, allow the unit to cool off before operating it. If no power is being supplied to the unit, check the connections first. If everything is in order, check the fuse. If no sound comes from the speakers of 2-speaker systems, set the fader control to the centre position. If your car is equipped with a power aerial, it will extend automatically while the unit is operating. Connecting this unit may cause some car battery wear when your car has no ACC (accessory) position on the ignition key switch. If you have any questions or problems concerning your unit that are not covered in this manual, please consult your nearest Sony dealer.
During playback, press (SHIFT), then press (3) (PLAY MODE) repeatedly until BANK appears. Press (4) (n) to repeatedly until the desired setting appears.
z BANK-ON z BANK-INV z BANK-OFF
Playback starts from the track following the current one.
To return to normal playing mode, select BANK-OFF in step 2 above.

Notes on handling CDs

A dirty or defective disc may cause sound dropouts while playing. To enjoy optimum sound, handle the disc by its edge. To keep the disc clean, do not touch the surface.
Do not stick paper or tape on the labelled surface.

continue to next page n

Do not expose the discs to direct sunlight or heat sources such as hot air-ducts, or leave them in a car parked in direct sunlight where there can be a considerable rise in temperature inside the car.

Maintenance

Fuse replacement
When replacing the fuse, be sure to use one matching the amperage rating stated on the original fuse. If the fuse blows, check the power connection and replace the fuse. If the fuse blows again after replacement, there may be an internal malfunction. In such a case, consult your nearest Sony dealer.

Tuner section

Tuning range Aerial terminal Intermediate frequency Usable sensitivity Selectivity Signal-to-noise ratio 87.5 108.0 MHz External aerial connector 10.7 MHz 12 dBf 75 dB at 400 kHz 65 dB (stereo), 68 dB (mono) Harmonic distortion at 1 kHz 0.8 % (stereo), 0.6 % (mono) Separation 35 dB at 1 kHz Frequency response 30 15,000 Hz
Tuning range Aerial terminal Intermediate frequency Sensitivity MW: 531 1,602 kHz LW: kHz External aerial connector 10.7 MHz/450 kHz MW: 30 V LW: 50 V

Power amplifier section

Outputs Speaker impedance Maximum power output Speaker outputs (sure seal connectors) ohms CDX-C4850R/C4840R/ 4260R: 40 W 4 (at 4 ohms) CDX-4250R/4240R/ 4250RV: 35 W 4 (at 4 ohms)
Design and specifications are subject to change without notice.

Troubleshooting guide

The following checklist will help you remedy the problems you may encounter with your unit. Before going through the checklist below, check the connection and operating procedures.
Problem No sound. Cause/Solution Cancel the ATT function. (CDX-C4850R/4250R/4250RV only) Set the fader control to the centre position for two-speaker systems. Rotate the dial in a clockwise direction to adjust the volume. The power cord or battery has been disconnected. The reset button has been pressed. n Store again into the memory. Remove the front panel and clean the connectors. See Cleaning the connectors (page 26) for details. An optional power amplifier is connected and you are not using the built-in amplifier. The beep sound is canceled (page 19).
The contents of the memory have been erased. Indications do not appear in the display. No beep sound.

CD/MD playback

Problem A disc cannot be loaded. Cause/Solution Another CD is already loaded. The CD is forcibly inserted upside down or in the wrong way (MD). Defective MD or dirty CD. Press 6 for two seconds. Press the reset button. The unit is installed at an angle of more than 60. The unit is not installed in a sturdy part of the car.

Playback does not begin.

A disc is automatically ejected. The ambient temperature exceeds 50C. CD will not eject. The operation buttons do not function. The sound skips due to vibration.

Radio reception

Problem Preset tuning is not possible. Automatic tuning is not possible. The ST indication flashes. Cause/Solution Memorise the correct frequency. The broadcast signal is too weak. The broadcast signal is too weak. n Use manual tuning. Tune in the frequency accurately. The broadcast signal is too weak. n Set to the MONO mode (page 11). continue to next page n
Problem The SEEK starts after a few seconds of listening. No traffic announcements. Cause/Solution The station is non-TP or has a weak signal. n Press (AF/TA) repeatedly until AF TA-OFF appears. Activate TA. The station does not broadcast any traffic announcements despite being TP. n Tune to another station. The station does not specify the programme type.

PTY displays NONE.

Error displays (when an optional CD/MD unit is connected)
The following indications will flash for about five seconds, and an alarm sound will be heard. Display Cause The disc magazine is not inserted in the CD/MD unit. No disc is inserted in the CD/MD unit. A CD/MD cannot play because of some problem. A CD is dirty or inserted upside down.*2 An MD does not play because of some problem.*2
Solution Insert the disc magazine in the CD/ MD unit. Insert discs in the CD/MD unit. Insert another CD/MD. Clean or insert the CD correctly. Insert another MD. Play an MD with tracks recorded on it.
NO MAG NO DISC NG DISCS ERROR

BLANK *

No tracks have been recorded on an MD.*2

RESET NO READY HI TEMP

The CD/MD unit cannot be operated Press the reset button of the unit. because of some problem. The lid of the MD unit is open or MDs are not inserted properly. The ambient temperature is more than 50C. Close the lid or insert the MDs properly. Wait until the temperature goes down below 50C.
*1 When an error occurs during playback of an MD or CD, the disc number of the MD or CD does not appear in the display. *2 The disc number of the disc causing the error appears in the display.
If the above-mentioned solutions do not help improve the situation, consult your nearest Sony dealer.

Bienvenido!

Enhorabuena por la adquisicin del reproductor de discos compactos Sony. Esta unidad le permitir disfrutar de una serie de funciones, as como de un mando rotativo opcional.

Slo CDX-C4850R/C4840R

Adems de las operaciones de reproduccin de discos compactos y de la radio, es posible ampliar el sistema mediante la conexin de una unidad de CD/MD*1 opcional. Si utiliza esta unidad o conecta una unidad opcional con la funcin CD TEXT, el visor mostrar la informacin CD TEXT al reproducir discos CD TEXT *2.
*1 Tambin es posible conectar un cambiador de CD, un cambiador de MD, un reproductor de CD o un reproductor de MD. *2 Un disco CD TEXT es un CD de audio que contiene informacin, como el ttulo del disco, nombre del cantante y ttulos de los temas. Esta informacin est registrada en el disco.

CDX-C4840R/C4850R

SERVICE MANUAL

AEP Model UK Model

Photo: CDX-C4850R
Model Name Using Similar Mechanism CD Drive Mechanism Type Optical Pick-up Name
CDX-C570R/C580R MG-363T-121 KSS-521A

SPECIFICATIONS

CD player section
System Signal-to-noise ratio Frequency response Wow and flutter Compact disc digital audio system 90 dB 10 20,000 Hz Below measurable limit

Power amplifier section

Outputs Speaker outputs (sure seal connectors) Speaker impedance ohms Maximum power output 40 W 4 (at 4 ohms)

Tuner section

FM Tuning range Aerial terminal Intermediate frequency Usable sensitivity Selectivity Signal-to-noise ratio 87.5 108.0 MHz External aerial connector 10.7 MHz 12 dBf 75 dB at 400 kHz 65 dB (stereo), 68 dB (mono) Harmonic distortion at 1 kHz 0.8% (stereo), 0.6% (mono) Separation 35 dB at 1 kHz Frequency response 30 15,000 Hz MW/LW Tuning range

General

Outputs Line outputs (2) (CDX-C4850R) Line output (1) (CDX-C4840R) Power aerial relay control lead Power amplifier control lead Telephone ATT control lead (CDX-C4850R) Bass 8 dB at 100 Hz Treble 8 dB at 10 kHz 12 V DC car battery (negative ground) Approx. 185 mm (w/h/d) Approx. 162 mm (w/h/d) Approx. 1.2 kg Parts for installation and connections (1 set) Front panel case (1)
Tone controls Power requirements Dimensions Mounting dimension
MW: 531 1,602 kHz LW: kHz Aerial terminal External aerial connector Intermediate frequency 10.7 MHz / 450 kHz Sensitivity MW: 30 V LW: 50 V
Mass Supplied accessories
Design and specifications are subject to change without notice.
FM/MW/LW COMPACT DISC PLAYER

MICROFILM

SECTION 4 DIAGRAMS

4-1. IC PIN DESCRIPTION

IC801 MB90574APMT-G-199-BND (SYSTEM CONTROL) Pin No. Pin Name I/O 55 LD ON FOK XLAT25 DATA25 XRST GFS NIL VCC NIL FLS SI/NOSE1 LCD SO/FLS SO LCD CKO BEEP NIL SQ SI NIL SQ CKO UNI SI UNI SO UNI CK C IN SIRCS TXT SI NIL TXT CKO CLOK25 SYSRST DEEMPH AMP ATT MD ON VSS C CD ON BUS ON NIL DVCC DVSS NIL ANGLE AVCC AVRH AVRL AVSS KEY INRC IN0 QUALITY NIL MPDH S-METER VCC NS MASK O I O O O I I O O O I O I O I/O I I I O O O O O O O O O O I I I I I O Laser ON/OFF control output Focus OK signal detection input CD signal processing latch output CD signal serial data output Reset output to CD signal processor IC. GFS signal detection input Not used. (Connect to ground in this set.) Power supply pin (+5 V) Not used. (Open) Front panel attachment detection input LCD serial data output LCD serial clock output BEEP output Not used. (Open) Sub Q data input Not used. (Connect to ground in this set.) Sub Q read clock output BUS system serial interface input BUS system serial interface output BUS system serial clock input/output Track jump No. count input Remote commander input CD-TEXT data input Not used. (Connect to ground in this set.) CD-TEXT data read clock output CD signal processing serial clock output System reset output De-emphasis output Power amplifier attenuator control output CD mechanism power control output Ground Power stabilization capacitor pin CD power control output BUS ON control output Power control output of A/D conversion. VREF input of D/A converter. Ground of D/A converter. Not used. (Open) LCD view angle alignment output (Not used in this set.) Analog power supply pin (+5 V) VREF + input of A/D converter. VREF input of A/D converter. Analog ground Key input Rotary commander input 0 Noise detection input Not used. (Connect to ground in this set.) Tuner multi path input S-meter voltage detection input Power supply pin (+5 V) Noise detection output Pin Description

Pin No. 88, 101 102, 105 106, 109 110
Pin Name AMP ON TXT ON VOL ATT NIL ATT RC IN1 TU ATT VSS NIL SSTOP TEST DAVN FM ON/AM ON TU ON SDA SCL NOSE2 X1A X0A SCOR BU IN DQSY CD SENS NIL TEL ATT ST/MONO SEEKOUT SD IN WIDE NARROW HSTX MD2 MD1, 0 RESET VSS X0 X1 VCC COM8V ON NIL AREA1 AREA2 LOUD BAND ACC IN PH3, 2 LCD CE FLS W RE IN0, 1 ILL ON PW ON NIL
I/O O O O O I O I I I O O I/O O I O I I I I I I I I/O O I O O I I O O I I I I I I O I I O O
Pin Description Power amplifier power control output Reset output to CD-TEXT decoder IC. Electric volume mute control output Not used. (Open) System attenuate control output Rotary commander shift key input 1 Tuner attenuate output Ground Not used. (Open) IF counter result signal detection input of PLL. Test mode initial setting detection input RDS IC data acquisition detection input FM ON output Tuner power control output I2C BUS serial data input/output I2C BUS serial clock output Front panel OPEN detection input Sub ceramic oscillator output (32 kHz) Sub ceramic oscillator input (32 kHz) SCOR signal detection input Backup power detection input CD-TEXT data setting completion signal detection input CD SENS signal detection input Key input acknowledge Telephone attenuate detection input Tuner stereo signal detection input/forced monaural output SEEK output Signal detector input WIDE select output (Not used in this set.) NARROW select output (Not used in this set.) Hardware standby input (Connect to pin ( (RESET).) Operation mode input (Connect to ground in this set.) Operation mode input (Connect to VCC in this set.) Reset input Ground Main ceramic oscillator input (4.19 MHz) Main ceramic oscillator output (4.19 MHz) Power supply pin (+5 V) COM 8V control output Not used. (Open) Destination select input 1 (Fixed at L in this set.) Destination select input 2 (Fixed at L (AEP, UK model) or H (German model) in this set.) Fixed at L in this set. Fixed at H in this set. Accessory power detection input Disc insertion detection photo sensor input (Fixed at H in this set.) LCD chip enable output Flash write input (Fixed at H in this set.) Rotary encoder input Illumination power control output System power control output Not used. (Open)

Pin No. 119 120

Pin Name ANT REM NIL CTL2 CD LD CD EJ L SW IN SW/(PH1) D SW VSS SELF SW/(IN SW)

I/O O O O I I I I

Pin Description ANT REMOTE power control output Not used. (Open) Not used in this set. Loading motor control output (Loading direction) Loading motor control output (Eject direction) Sled limit switch detection input Disc insertion detection input DOWN switch detection input Ground Disc self store detection input
4-7. SCHEMATIC DIAGRAM CD MECHANISM SECTION Refer to page 32 for Waveforms. Refer to page 51 for IC Block Diagrams.
Note: Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : CD PLAY : Impossible to measure

(Page 41)

4-9. SCHEMATIC DIAGRAM MAIN SECTION (1/3) Refer to page 53 for IC Block Diagrams.

(Page 36)

C4850R

(Page 44)

(Page 46) Note: Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ( ) : MW < > : CD PLAY
4-10. SCHEMATIC DIAGRAM MAIN SECTION (2/3) Refer to page 51 for IC Block Diagrams.
Note: Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ( ) : MW < > : CD PLAY

(Page 45)

4-11. SCHEMATIC DIAGRAM MAIN SECTION (3/3) Refer to page 53 for IC Block Diagrams.

(Page 42)

(Page 47)
4-12. SCHEMATIC DIAGRAM DISPLAY SECTION

(Page 46)

Note: Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM
IC Block Diagrams IC1 CXD2507AQ
XLON SPOD SPOC SPOB SPOA CLKO VDD XLTO DATO CNIN SEIN CLOK XLAT

IC602 SAA6588T-118

52 PSWN 11 MAD 12 SERVO AUTO SEQUENCER IIC-BUS SLAVE TRANSCEIVER 10 SCL 9 SDA
SIGNAL QUALITY DETECTOR 5
FOK MON MDP MDS LOCK TEST FILO FILI PCO VSS AVSS CLTV AVDD

CPU INTERFACE

SUB CODE PROCESSOR 4 DIGITAL CLV

DIGITAL PLL

EFM DEMODULATOR
DATA XRST SENS MUTE SQCK SQSO EXCK SBSO SCOR VSS WFCK EMPH

AFIN 13

PAUSE DETECTOR

INTERFACE REGISTER

VDDA VSSA MPX VREF
CLOCKED COMPARATOR POWER SUPPLY AND RESET 57kHz 8th ORDER BAND-PASS

RDS/RDBS DEMODULATOR

RDS/RDBS DECODER
OSCILLATOR AND CLOCK TEST CONTROL MULTI-PATH DETECTOR

DAVN VDDD VSSD OSCI OSC0

SCOUT 18 CIN 19 LVIN 20

3 TCON 2 MPTH 1 MRO

3 ASYMMETRY CORRECTOR 5 D/A INTERFACE DIGITAL OUT

CLOCK GENERATOR

39 DOUT 34 C4M FSTT XTSL XTAO XTAI

RF BIAS ASYI ASYO ASYE

16K RAM

ERROR CORRECTOR 3

WDCK 19

33 MNTO

LRCK PCMD BCLK GTOP XUGF XPCK VDD GFS RFCK C2PO XROF MNT3 MNT1

IC3 BA6796FP-T1

OP IN OP IN + CH3-IN CH2-IN CH1-IN CH1 + CH2 + CHDRIVE BUFFER DRIVE BUFFER 14 CH3

CH1 17

LEVEL SHIFT

VCC LEVEL SHIFT

DRIVE BUFFER

THERMAL SHUT DOWN

LOGIC CTL1 CTL2 FWD REV

1 OPOUT

2 CH4-IN

4 CTL1

5 CTL2

8 TRAY

10 CH5

11 COM

12 CH4 +

13 CH3 +

IC2 CXA1782BQ
PHD 2 PHD 1 RF M RF O PHD RF I

CC2 IIL

LEVEL S

MIRR RF IV AMP1 DFCT

FOK 24 23

SENS C.OUT

TTL RF IV AMP2 FE BIAS 37 TTL IIL DATA REGISTER INPUT SHIFT REGISTER ADDRESS DECODER FE AMP

XRST DATA XLT CLK

IIL IIL OUTPUT DECODER 19
38 F IV AMP TOG1-3 BAL1-3 FZC COMP FS1-4 TG1-2 TM1-7 PS1-4
E IV AMP EI 40 TE AMP BAL1 BAL 3 BAL2

HPF COMP VEE

LPF COMP
TRACKING PHASE COMPENSATION TM6
41 TGTOG1 TOG2 TOG3 TM5 TM4 TZC COMP FCS PHASE COMPENSATION TM3 WINDOW COMP ATSC DFCT DFCT TM1 FS1 TM7 FSTA O TMSL P 15 SL O SL M

TED 42

LPFI 43 TEI 44

ATSC 45 TZC 46

TDFCT 47 TG2

3 FDFCT

6 FE O

7 FE M

SRCH TGU

10 TG2

11 FSET

12 TA M

IC401 TDA7462
PAUSE DETECT INPUT GAIN & AUTO ZERO TREBLE/ BASS CONTROL CIRCUIT FRONT FADER
SE3L SE3R MUTE SDA SCL PAUSE
SE1L SE1R MD+ MD CDL+ CDL CDR CDR+ PDR PDGND PDL SE2L SE2R

FRONT SIDE SELECTOR

LOUDNESS CONTROL CIRCUIT

VOLUME CONTROL CIRCUIT

SOFT MUTE

VOICE BANDPASS HP LP

22 OUT FL
INPUT MULTIPLEXER & MIXING STAGE
FRONT FADER COMPANDER REAR FADER LOUDNESS CONTROL CIRCUIT

21 OUT FR

REAR SIDE SELECTOR

20 OUT RL

INPUT GAIN

REAR FADER

19 OUT RR

SUBWOOFER LP

FADER 18 SUBOUT+ 17 SUBOUT SDA

SUBWOOFER OUT IIC BUS

DIGITAL CONTROL CIRCUIT

SCL 16 VDD 15 GND

CREF 14

POWER SUPPLY

IC702 PCM1717E-ST2

IC901 BA4903

XTI DGND VDD

CLK CONTROL

20 XTO 19 CLKO

LRCIN 4 DIN BCKIN ZERO 7

INPUT INTERFACE
18 ML/MUTE MODE CONT ROL 17 MC/DMMD/DMRSTB 14 MODE

DIGITAL FILTER

REGULATOR VREF
NOISE SHAPER 5LEVE DAC LOWPASS FILTER CMOS AMP 5LEVEL DAC LOWPASS FILTER CMOS AMP
1 AMP ON CIRCUIT ON 2 AMP OUT 3 GND

OVER VOLTAGE PROTECT

5 VDD OUT

13 D/C L 12 VOUTL 11 VCC

VOUTR 9 AGND 10

IC601 TDA7427AD1TR

28 LPOUT VDD1 LP FM LP HC LP AM V REF INLOCK DETECTOR TEST LOGIC SWITCH LP1/LP2 CHARGE PUMP PHASE COMP 11 BIT PROG COUNTER SWITCH SWM/DIR 6 BIT PROG COUNTER SWITCH SWM/DIR PRE COUNTER :32/33 SWITCH AM/FM 27 VDDGND AM

25 AM IN

LCL/DX SEEK NIL MONO

24 FM IN

PORT EXTENSION
OSCIN 9 OSCOUT 10 NC 11 SCL 12 SDA 13 BUS INTERFACE I2C

REF OSCILLATOR

16 BIT PROG COUNTER
SUPPLY & POWER ON RESET
22 GND D 21 VDDADDR 19 HFREF 18 AMOSC

14 BIT PROG COUNTER

CONTROL

SWITCH OUT

17 DOUT/INLOCK

IF AM 14

SWITCH AM/FM

11-21 BIT PROG COUNTER

16 SSTOP 15 IF FM

IC703 LC89170M-T

IC803 BA8270F-E2

VDD EXCK VDD

BUS ON 1
BUS ON SWITCH RESET SWITCH BATTERY SWITCH

14 VCC

SBSO WORD X 8 BIT DUAL PORT RAM CRC CHECKER 13 DQSY

SCOR 3

12 SRDT

BATT 3

RST BUS ON CLK IN BU IN

WFCK 4

11 SCLK

XMODE 6 GND 7

TIMING & SYNCHRONIZATION SIGNAL PROTECTION

10 SW2

CLK 4 VREF 5 DATA 6 GND 7

9 DATA IN 8 DATA OUT

8 TEST