BLAUPUNKT (AUDI) AUTORADIO - AUDI CHORUS CIRCUIT DIAGRAM, EXPLODED VIEW SCHEMATIC DIAGRAM

 BLAUPUNKT (AUDI) AUTORADIO - Audi Chorus - 7 646 243 380, Audi Chorus A8 - 7 647 243 380, Audi Chorus - 7 646 243 380, Audi Chorus A8 - 7 647 243 380, Audi Concert - 7 646 248 380, Audi Concert A8 - 7 647 248 380, Audi Concert Navi - 7 647 249 380, Audi Concert - 7 646 248 380, Audi Concert A8 - 7 647 248 380, Audi Concert Navi - 7 647 249 380

  For the process of handling the LEDs while they are supplied with their operating voltage and not covered by their respective filters or diffuser screens, the following instructions must be observed:

  Repairs and function checks may be carried out with protection glasses only.

The used glass material must have a UV- or sun ray protection filter (e. g. UVEX sport style 9186 088).

The operation with higher currents, also for short duration, is not permitted.

The viewing angle towards the circuit board may not exceed 60°.

(In the case of non-observance of the instructions serious damage to the eyes may result.)

Ex-factory condition

Audi Chorus:  This car radio can be operated with 2 passive front loudspeakers and of choice with 2 active rear loudspeakers. The switching-over takes place by means of the diagnosis bus.

Audi Concert: This car radio can be operated with 2 passive and 2 active loudspeakers or as a Bose sound system. In addition the unit can be switched to the US mode. The switching-over takes place by means of the diagnosis bus.

Pin assignment of quick-fit connector

 (The below illustrated unit must be exchanged completely, as the contact assignment of the foil can only be done in the manufacturing process.)

Exploded View

Schematic

PANASONIC CQ-EH9160A - CAR AUDIO SYSTEM - ALIGNMENT - SCHEMATIC

CQ-EH9160A - PANASONIC CAR AUDIO SYSTEM - ALIGNMENT - SCHEMATIC

Panasonic HONDA CQ-EH9160A _ AM/FM MPX ELECTRONIC TUNING RADIO with Stereo Cassette Tape Player and 6-Disc CD Changer.

VEHICLE: ACURA RSX:  DESTINATION: North America

                                                                                                                   

Dolby NR Alignment & ALIGNMENT POINTS

DO NOT align the FM/AM package block.  When the package box is necessary; it will be supplied already aligned at the factory.

CD DISC ENTERING ALIGNMENT

This adjustment is for assuring that compact discs will be placed in the centre of the turntable.
Adjustment Condition / Jig
Power Supply Voltage : 13.2V
Test Disc : TCD-784M

Adjustment Procedures
* Attach the adjusting screw to the upper chassis (See Figure 1.).
* Insert the test CD (TCD-784M) into the disc No.1 position and play it.
* After checking whether the disc is centred on the turntable, turn the adjusting screw unit it is in the center.

Check Items
1 Check that the disc is correctly centered.
2 Check that the disc is securely clamped.
3 Check that no abnormal noise is produced when clamping the disc.

Directions of Turning the Adjusting Screw
* CD stops before its proper position: Turn the screw counter-clockwise.
* CD overruns: Turn the screw clockwise.
* After the adjustment, lock the screw.

CD SERVO & MAIN BLOCK SCHEMATIC

CLICK ON THE PICTURES TO MAGNIFY

BLAUPUNKT - OPEL CAR 300 NT - OPEL CAR 300 - OPEL CAR 2003 AUTORADIO - SCHEMATIC

BLAUPUNKT - Opel Car 300 NT - Opel Car 300 - Opel Car 2003 AUTORADIO - SCHEMATIC

Circuit Dagram _ Opel Car 300 NT - Opel Car 300 - Opel Car 2003 AUTORADIO

Blaupunkt Opel car radio _ Main board & Keyboard Schematics

KEY BOARD SCHEMATICS

There are three types of keyboards for these sets.

MAIN BOARD SCHEMATIC

CLICK ON THE SCHEMATICS TO MAGNIFY

SONY CAR AUDIO WIRING DETAILS & SOCKETS

SONY CAR AUDIO WIRING Details & Sockets

Sony Car Stereos _ XR-7300, XR-7200, XR-7201, XR-7202, XR-7400,  XR-3700RDS, XR-3750, XR-3690RDS, XR-6700RDS, XR-C700, MDX-U1RDS, XR-7082 _  & Others - Wiring Details

SONY XR-7300, XR-7200, XR-7201, XR-7202, XR-7400 

CDX-R79VF

SONY XR-502

SONY XR-7082

SONY XR-3700RDS, XR-3750, XR-3690RDS, XR-6700RDS, XR-C700

SONY XR-7042, XR-4403

SONY CDX-5072

SONY MDX-U1RDS

SONY XR-C210, XR-C214

SONY XR-4252

Click on the tables to Magnify

PHILCO PCA 230 - AUTO RADIO - SCHEMATIC DIAGRAM [CIRCUIT DIAGRAM] - TDA 8264 – KIA 4558 – TDA 7313

PHILCO PCA 230 - AUTO RADIO - SCHEMATIC DIAGRAM [Circuit Diagram] - TDA 8264 – KIA 4558 – TDA 7313

SCHEMATIC [MAIN] (PCA 230VA, B, C)

SCHEMATIC [MAIN] (PCA 230VD)

CLICK ON THE SCHEMATICS TO ZOOM.

KENWOOD CAR STEREO - KDC-5090B CD RECEIVER – TEST MODE – SECURITY CODES – SPECIAL DISPLAY FOR TUNER MODE – CAR AUDIO REPAIR AND SERVICE

KENWOOD Car stereo - KDC-5090B CD RECEIVER – Test mode – Security codes – Special display for tuner mode – Car audio repair and service

                                                 Category: Car Audio Repair and Service 

Contents of this article 

• How to access Test mode 
• EEPROM security code setting 

KENWOOD KDC-5090B

TEST MODE

How to enter the test mode
While holding the FM and Preset 6 keys, reset the unit.
How to exit from the test mode
While holding the Preset 6 key, reset the unit. (Note) The test mode cannot be terminated by ACC OFF, power OFF or momentary power down.
Initial status in the test mode
# Sources : ALL OFF
# Display : All segments are lit.
# Volume : -10dB (displayed as “30”)
# Loudness : OFF
# CRSC : OFF regardless of the presence of switching function.
# SYSTEM Q : Flat
Special display in Tuner mode
When any of the following messages is displayed in Tuner mode, the F/E may be abnormal.
# “TNE2P NG” : The EEPROM is set to the default (unstable values) because the F/E was shipped without passing through the adjustment process, etc.
# “TNCON NG” : Communication with the F/E is not possible.
Forced switching of K3I
Each press of the Preset 6 key in Tuner mode should switch
K3I from AUTO > Forced Wide > Forced Middle > Forced
Narrow > AUTO.
The initial status is AUTO and the display shows these
modes as follows.
# AUTO : FMA
# Forced Wide : FMW
# Forced Middle : FMM
# Forced Narrow : FMN

Test mode specifications of the CD receiver
# Forced ejection is inhibited in the reset start operation. When the unit is reset while a CD is loaded in it, the CD is not recognized by resetting.

# Each press of the Track Up key jumps to the following track numbers:
No. 9 > No. 15 > No. 10 > No. 11 > No. 12 > No. 13 > No. 14 > No. 9 (The cycle restarts from here.)
# Each press of the Track Down key jumps to the previous track number to the track being played.
Audio-related specifications
# A short press of the Q key initiates the audio adjustment mode.
# Pressing the ✽ key on the remote initiates the audio adjustment mode.
# Continuous holding of a remote control key is inhibited.
# Bass, Middle and Treble are adjusted in 3 steps of Min / Center / Max with the Track Up/Down keys.
# Balance is adjusted in 3 steps of Left Max / Center / Right Max with the Track Up/Down keys.
# Fader is adjusted in 3 steps of Rear Max / Center / Front Max with the Track Up/Down keys.
# HPF is adjusted in 2 steps of Through/220Hz with the Track Up/Down keys.
# LPF is adjusted in 2 steps of Through/120Hz with the Track Up/Down keys.
# Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble f are not dealt with by the audio adjustment.
Menu-related specifications
# A short press of the CLK key initiates the Menu mode.
# Pressing the DNPP/SBF key on the remote initiates the Menu mode.
# Continuous holding of a remote control key is inhibited.
# Contrast is adjusted in 3 steps of 0/5/10 and the default is 5.
Backup current measurement
When the unit is reset while ACC is OFF (i.e. by turning Backup ON), the MUTE terminal goes OFF in 2 seconds in place of 15 second. (The panel and CD mechanism are not activated at this time.)

Security-related information Forced Power ON mode (All models)
Even when the security (Mask key) is approved, resetting the unit while holding the ATT and Preset 4 keys makes it possible to turn the power ON for 30 minutes. After 30 minutes have elapsed, it is not possible to return to the previous condition unless the unit is reset again.

Method of registration of the security code after EEPROM (Tuner Unit Ass’y) replacement (Code security model)
1) Enter the test mode. 
2) Press the CLK key to enter the security registration mode.
3) Enter the code using the Preset 1/2/3/4 keys. Example : To enter “3510”
# Press the Preset 1 key 4 times.
# Press the Preset 2 key 6 times.
# Press the Preset 3 key twice.
# Press the Preset 4 key once.
4) Hold down the DISP key for at least 3 seconds and the message, “RE-ENTER” appears, so once again enter the code according to Step 3) above.
5) Press and hold the DISP key for 3 seconds until “APPROVED” is displayed.
6) Exit from the test mode. 
(Note) All Clear is not applicable to the security code of this model.
Method of writing the Mask key while the EEPROM is in the initial status
1) Enter the test mode. 
2) Press the CLK key to enter the Mask key registration mode. “TRANSMIT1” should be displayed now. The display at this time should show “< >” in place of “ [ ] ”.
3) Point the Mask key remote toward the light sensor, and press and hold its key for more than 0.5 second.
4) When “TRANSMIT2” is displayed, press and hold the key on the Mask key remote for more than 0.5 second again. The first and second counter codes are not compared at this time.
5) When “APPROVED” is displayed, the write operation is complete. Now the demonstration mode is initiated and the test mode is terminated.
(Note) In the same way as previous models, if 30 minutes have elapsed with no code written, an error occurs and the power is turned OFF.

Method of initializing the Mask key (How to reset the unit from the Mask key approved condition to the factory condition)
1) Enter the test mode. 
2) “TRANSMIT1” is displayed and the Mask key entry request mode is initiated. The display at this time should show “** ” in place of “ [ ] ”.
3) Press and hold the key on the Master key remote for more than 3 seconds.
4) When “TRANSMIT2” is displayed, press and hold the key on the Master key remote for more than 3 seconds again.
5) When “APPROVED” is displayed, the Mask key is cleared, the demonstration mode is initiated, the test mode is terminated and the unit returns to the factory condition.
Method of clearing all Mask key-related data
1) Enter the test mode.
2) Press the CLK key to enter the Mask key registration mode. “TRANSMIT1” should be displayed now.
3) Point the Master key remote toward the light sensor, and press and hold its key for more than 3 seconds (until the level display shows the full condition).
4) When “TRANSMIT2” is displayed, press and hold the key on the Mask key remote for more than 3 seconds again. If “TRANSMIT1” is displayed in place of “TRANSMIT2”, restart the procedure from step 3).
5) When “APPROVED” is displayed, all security data is cleared and the unit returns to the condition before Mask key writing with the EEPROM in the initial status.

Hyundai H CDM8042 Car Stereo Circuit Diagram

Used ICs:  SC9257 - SC6579 - S1L9226X

S1L9226X

As a pre-signal & servo signal processor for the DISC-MAN, S1L9226X is a low voltage, low consumption current IC that can read CD-RW, and CD-R discs and can be applied to various products, such as the CDP/VCD/CDMP3 for the DISC-MAN. It is a hard-wired free-adjustment servo, which automatically controlled the control point of the pre-signal portion.

FEATURES
RF Amplifier (CD, CD-R, CD-RW applicable)
Gain setting & monitoring for the CD-R, CD-RW DISC
RFAMP offset adjustment
Focus error amp & Febias adjustment
Tracking error amp & balance, gain adjustment
FOK, defect, mirror detect
Center voltage amplifier
APC (Automatic Power Control)
RF AGC & EQ control (AGC Level Control Compatible)
Enhanced EFM slice (Double Asymmetry Method)
Focus servo loop & offset adjustment
Tracking servo loop & offset adjustment
Sled servo loop
Spindle servo loop
Auto-sequence
Fast search mode (1 - 36000 track jump)
Interruption countermeasure
Focus & Tracking servo muting controlled by EFM duty check
RF peaking prevention system by EFM duty check
Focus, tracking, spindle loop pole move option
Operating voltage 2.7V ¾ 3.3V
Power saving mode
LPC Control used by side beam signal, it related to pick-up assurance.  When used pick-up, the specification is present extra.

SC9257 [PLL FOR DTS]

DESCRIPTION

The SC9257 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers.

All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system.

FEATURES

> Optimal for configuring digital tuning systems in high-fi tuners and car stereos.

> built-in prescalers. Operate at input frequency ranging from 30~150 MHz during FMIN input (with 2 modulus prescaler) and at 0.5~40MHz during AMIN input (with 2 modulus prescaler or direct dividing).

> 16 bit programmable counter, dual parallel output phase comparator, crystal oscillator and reference counter.

> 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be used.

> 15 possible reference frequencies. ( When using 4.5MHz crystal)

> Built-in 20 bit general-purpose counter for such uses as measuring intermediate frequencies (IFIN1 and IFIN2) and lowfrequency pilot signal cycles (SCIN).

> High-precision (±0.55~±7.15µs) PLL phase error detection.

> Numerous general-purpose I/O pins for such uses as peripheral circuit control.

> 4 N-channel open-drain output ports (OFF withstanding voltage:12V) for such uses as control signal output.
> Standby mode function (turns off FM, AM and IF amps) to save current consumption.
> All functions controlled through 3 serial bus lines.
> CMOS structure with operating power supply range of VDD=5.0±0.5V.

Schematic ( Circuit Diagram)

SC6579 [RADIO DATA SYSTEM (RDS) DEMODULATOR]
DESCRIPTION
The integrated CMOS circuit SC6579 is an RDS demodulator. It recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting.  The data signal RDDA and the clock signal RDCL are provided as outputs for further processing by a suitable decoder (microcomputer).

FEATURES
Anti-aliasing filter (2nd order)
Integrated 57 kHz band-pass filter (8th order)
Reconstruction filter (2nd order)
Clocked comparator with automatic offset compensation
57 kHz carrier regeneration
Synchronous demodulator for 57 kHz modulated RDS signals
Selectable 4.332/8.664 MHz crystal oscillator with variable dividers
Clock regeneration with lock on bi-phase data rate
Bi-phase symbol decoder with integrate and dump functions
Differential decoder
Signal quality detector
Subcarrier output.

Panasonic CQ-C3302N Circuit Diagram – Exploded view - WMA MP3 CD Player/Receiver

Schematic - Exploded view - Panasonic  WMA MP3 CD Player/Receiver CQ-C3302N

Power Supply => DC 12V (11V - 16V),
Test Voltage => 14.4V
Negative Ground
Current Consumption => Less than 2.2A (CD mode ; 0.5W 4-channels)
Maximum Power Output => 50W×4 (at 4Ω)
Power Output => 22Wx4 (DIN45 324, at 4Ω)
Pick-Up Type Astigma 3-beam

Use fuses of the same specified rating (15amps). Using different substitutes or fuses with higher ratings, or connecting the product directly without a fuse, could cause fire or damage to the stereo unit.

This model has no servo alignment points because microcomputer controls the servo circuit.

Mechanism Exploded

Unit-Exploded

Connector

Circuit Diagram (Schematic)

Click on the pictures to zoom in

Sony CDX GT41US - FM/AM COMPACT DISC PLAYER – Schematic (Circuit Diagram)

FM-AM COMPACT DISC PLAYER Sony CDX-GT41UW - GT410U - GT460U - GT460US – Schematic – Wiring diagram. Used ICs: TDA8588AJ/N2/R1 – BA8271F-E2 – BD3442FS-E2 – BD9778HFP – NJM2387ADL3 – M880F46PF-0-101E1

Power amplifier section
Outputs Speaker outputs (sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output - 52 W × 4 (at 4 ohms)
FM Tuning range GT41UW/GT410U
87.5 – 107.9 MHz
GT460U/GT460US
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval GT460U/GT460US:
50 kHz/200 kHz switchable.

AM Tuning range GT41UW/GT410U
530 – 1,710 kHz
GT460U/GT460US
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
AM tuning interval GT460U/GT460US
9 kHz/10 kHz switchable.
AUDIO POWER SPECIFICATIONS (US MODEL)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into 4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than 5% total harmonic distortion.
CD Drive Mechanism Type MG-101U-188//Q
Optical Pick-up Name DAX-25A
NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing, the complete SERVO board (A-1206-357-A) should be replaced since any parts in the SERVO board cannot be repaired

Click on the pictures to zoom in

Circuit Diagram (Schematic)

Connection diagram

1 To a metal surface of the car First connect the black ground (earth) lead, then connect the yellow and red power supply leads.

2 To the power antenna (aerial) control lead or power supply lead of antenna (aerial) booster

Notes

• It is not necessary to connect this lead if there is no power antenna (aerial) or antenna (aerial) booster, or with a manually-operated telescopic antenna (aerial).  • When your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control and power supply leads.”

3 To AMP REMOTE IN of an optional power amplifier

This connection is only for amplifiers. Connecting any other system may damage the unit.

4 To the +12 V power terminal which is energized in the accessory position of the ignition switch.

Notes

• If there is no accessory position, connect to the +12 V power (battery) terminal which is energized at all times.  Be sure to connect the black ground (earth) lead to a metal surface of the car first.

• When your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control and power supply leads.”

5 To the +12 V power terminal which is energized at all times.  Be sure to connect the black ground (earth) lead to a metal surface of the car first.

Notes on the control and power supply leads

• The power antenna (aerial) control lead (blue) supplies +12 V DC when you turn on the tuner.

• When your car has built-in FM/AM antenna (aerial) in the rear/side glass, connect the power antenna (aerial) control lead (blue) or the accessory power supply lead (red) to the power terminal of the existing antenna (aerial) booster.

• A power antenna (aerial) without a relay box cannot be used with this unit.

Memory hold connection

When the yellow power supply lead is connected, power will always be supplied to the memory circuit even when the ignition switch is turned off.

Notes on speaker connection

• Before connecting the speakers, turn the unit off.

• Use speakers with an impedance of 4 to 8 ohms, and with adequate power handling capacities to avoid its damage.

• Do not connect the speaker terminals to the car chassis, or connect the terminals of the right speakers with those of the left speaker.

• Do not connect the ground (earth) lead of this unit to the negative (–) terminal of the speaker.

• Do not attempt to connect the speakers in parallel.

• Connect only passive speakers. Connecting active speakers (with built-in amplifiers) to the speaker terminals may damage the unit.

• To avoid a malfunction, do not use the built-in speaker leads installed in your car if the unit shares a common negative (–) lead for the right and left speakers.

• Do not connect the unit’s speaker leads to each other.

Note on connection

If speaker and amplifier are not connected correctly, “FAILURE” appears in the display. In this case, make sure the speaker and amplifier are connected correctly.

KENWOOD - KDC-8021 - KDC-M9021 - KDC-X859 - TEST MODE

TEST MODE

To enter Test Mode.

• While holding [1/5] key and the [3/7] key, reset the unit.
• To exit from test mode, Hold down the [4/8] key, reset the unit.
• Test Mode Reset Status

• Special displays in tuner.
• When the following display appear in tuner mode, it shows a problem with the fond end.

1. "TNEP2 NG":  F/E is not aligned and EEPROM is in reset such as when skipped.
2. "TNCON NG":  Cannot communicate with F/E (fond end).

• K31 switching.  Each time the Preset '6' key is pressed in Tuner Mode, switches one at a time through the following sequence. [AUTO=>FORCED WIDE=>FORCED MIDDLE=>FORCED NARROW=>AUTO].
• When reset, displays the following in AUTO.

1. AUTO  = FMA
2. FORCED WIDE  = FMW
3. FORCED MIDDLE  =  FMM
4. FORCED NARROW  = FMN

CD receiver test mode specifications.

• No automatic ejection during reset-start.  does not make a CD check in reset with a CD is loaded. 
• Using the Track Up key jumps to the following tracks.  NO. 9=> NO.15=>NO. 10=>NO. 12=> NO. 14=> and back to NO. 9.
• Using the Track Down key moves 1 track downwards from the track being played.  
• When total number of MP3 or WMA disc tracks is '9' or less, playback start from the first track.  
• With model equipped with the MP3 or Mp3/WMP mechanism, the mechanism model name and version number are displayed at the bottom line.

Audio Items.

• Momentarily pressing the 'Q' key calls up Audio Adjustment mode.
• Pressing the [*] key on the remote control calls up Audio Alignment mode.
• An initial item is set to Feder.
• Continuous forward is disabled on the remote control.
• Bass/Middle/Treble/NF are settable in '3' steps of [MIN/CENTER/MAX] with track Up or Dn keys.
• Balance is settable in '3' steps of Left Max/Center/Right max, with Track Up/Dn keys.
• Fader is settable in '3' steps of Rear Max/Center/Front Max with Track Up/Dn keys.
• HPF is settable in '2' steps of THRU/220Hz with Track Up/dn keys.
• LPF is settable in '2' steps of THRU/120Hz with Track Up/Dn keys.
• Bass f/ Bass Q/ Bass EXT/Middle f / middle Q.
• Treble f, do not appear in the audio alignment.

Menu Items

• The DNPP/SBF keys on the remote control calls up Menu Mode.
• Continuous forward is disabled on the remote control.

Backup Current Measurement

• The Mute Terminal turns Off '2' seconds after being reset in ACC Off.  The panel and CD mechanisms are disabled during this time.

Channel Space Switching [K/M mode]:  While holding the [1/5] key and the [4/8] key, reset the unit.

Others

• Automatic panel close is disabled when CD is inserted.
• Panel operation is disabled at Power-On or Power-Off.
• Panel open and closes with press long the 'Q' key.
• No displays such as "CODE OFF"during Power-On.
• Pressing the 'T1' [Auto] key during changer operation turns in 2Zone.  Cancel by pressing 'T1'[Auto] key again.
• Pressing the [4/8] key for '1' second or more during all Off, calls up the Mask Key [security] write mode

1. Sources are all Off.
2. All display segments lit up.
3. Volume at [-10db], shows 30 on display.
4. Loud is Off.
5. CRSC is Off.  System Q is in Flat.
6. BEEP sounds at momentary pressing at any time