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PN-1741D, N
COMPONENTS
PN-1741D-A,D-B,D-C,N-A,N-B
Main unit
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1
NOTE
We cannot supply PWB with component parts in prin-
ciple. When a circuit on PWB has failure,please repair it
by component parts base. Parts which are not mentioned
in service manual are not supplied.
To engineers in charge of repair or
inspection of our products.
Before repair or inspection, make sure to follow the
instructions so that customers and Engineers in
charge of repair or inspection can avoid suffering
any risk or injury.
1. Use specified parts.
The system uses parts with special safety features against
fire and voltage. Use only parts with equivalent character-
istics when replacing them.
The use of unspecified parts shall be regarded as remod-
eling for which we shall not be liable. The onus of product
liability (PL) shall not be our responsibility in cases where
an accident or failure is as a result of unspecified parts
being used.
2. Place the parts and wiring back in their original positions
after replacement or re-wiring.
For proper circuit construction, use of insulation tubes,
bonding,gaps to PWB, etc, is involved. The wiring connec-
tion and routing to the PWB are specially planned using
clamps to keep away from heated and high voltage parts.
Ensure that they are placed back in their original positions
after repair or inspection.
If extended damage is caused due to negligence during
repair, the legal responsibility shall be with the repairing
company.
3. Check for safety after repair.
Check that the screws, parts and wires are put back se-
curely in their original position after repair. Ensure for safety
reasons there is no possibility of secondary ploblems
around the repaired spots.
If extended damage is caused due to negligence of repair,
the legal responsibility shall be with the repairing company.
4. Caution in removal and making wiring connection to the
parts for the automobile.
Disconnect the battery terminal after turning the ignition
key off. If wrong wiring connections are made with the bat-
tery connected, a short circuit and/or fire may occur. If ex-
tensive damage is caused due to negligence of repair, the
legal responsibility shall be with the repairing company.
5. Cautions regarding chips.
Do not reuse removed chips even when no abnormality is
observed in their appearance. Always replace them with
new ones. (The chip parts include resistors, capacitors,
diodes, transistors, etc). The negative pole of tantalum
capacitors is highly susceptible to heat, so use special care
when replacing them and check the operation afterwards.
6. Cautions in handling flexible PWB
Before working with a soldering iron, make sure that the
iron tip temperature is around 270 . Take care not to apply
the iron tip repeatedly(more than three times)to the same
patterns. Also take care not to apply the tip with force.
7. Turn the unit OFF during disassembly and parts replace-
ment. Recheck all work before you apply power to the unit.
EXPLANATION OF IC
052-3162-11
M30624MGA-123GP
Main System Controller
1.Terminal Description
pin
1: DISP CLK OUT : O : The clock pulse output to the display driv-
er.
pin
2: DISP DATA
:I/O: The serial data output to the LCD driver,
or the serial data input/output for the VFD
driver.
pin
3: DISP INT/DI
: IN : The serial data input from the LCD driv-
er, or the interrupt signal input from the
VFD driver.
pin
4: ILL PULSE
: IN : ILL-pulse input.
pin
5: TIME BASE
: IN : Time base signal input.
pin
6: BYTE
: IN : The data length selection(8bit/16bit_).
pin
7: CN VSS
: IN : Inputting "L" at single mode operation.
pin
8: TEST_
: IN : Test enable signal input.
pin
9: ILL ON
: IN : "H"= Illumination ON.
pin 10: RESET
: IN : Reset signal input.
pin 11: X OUT
: O : Crystal connection.
pin 12: GND
: - : Ground.
pin 13: X IN
: IN : Crystal connection.
pin 14: VDD
: - : Positive supply voltage.
pin 15: NU
: - : Not in use.
pin 16: B/U DET
: IN : Backup voltage ON signal input.
pin 17: ACC ON
: IN : ACC ON signal input.
pin 18: TEL
: IN : The telephone interrupt pulse input.
pin 19: SB SYNC
: IN : Sub code sync.
pin 20: AMP ON
: O : Audio power amplifier ON signal output.
pin 21: SYS ON
: O : System-ON signal output.
pin 22: DSP ON
: O : The ON signal for the VFD filament or the
back light of LCD.
pin 23: AF MUTE
: O : Audio frequency mute signal output.
pin 24: BEEP
: O : Beep out.
pin 25: NAVI MUTE
: O : Mute signal output to suppress the noise
signal at Navigation sound interrupting.
pin 26: 6 CD REQ
: IN : The request signal input.
pin 27: 6 CD RX
: IN : The signal input of NDS.
pin 28: 6 CD TX/ON
: O : The signal output of NDS, or the CD ON
signal output.
pin 29: NDS TX
: O : NDS TX
pin 30: NDS RX
: IN : NDS RX
pin 31: FLASH CLK
: O : The flash clock output.
pin 32: NAVI ON
: O : Navigation ON signal output.
pin 33: ES TX
: O : ES TX.
pin 34: ES RX
: IN : ES RX.
pin 35: NDS CNT
: O : The selection signal output for the exter-
nal CD automatic changer.
pin 36: NDS REQ 2
: IN : Request signal input from NDS.
pin 37: NDS REQ 1
: IN : Request signal input from NDS.
pin 38: SOURCE CHG : O : The selection signal output for the exter-
nal CD automatic changer.
pin 39: FLASH EPM
: O : FLASH EPM.
pin 40: VOL/EEP DO
: O : The serial data output to the electric vol-
ume or the EEP ROM.
pin 41: VOL/EEP CL
: O : The clock pulse output to the electric vol-
ume or the EEP ROM.
pin 42: VOL CE
: O : Chip enable signal output to the volume
IC.
pin 43: EEP CE
: O : The chip enable signal output to the EEP
ROM.
pin 44: FLASH CE
: O : FLASH CE.
pin 45: EEP DI
: IN : The serial data input from EEP ROM.
pin 46: AUX REQ
: O : AUX request signal output.
pin 47: AUX ON
: IN : AUX ON flag input.
pin 48: COMB ON
: O : COMB ON flag output.
pin 49: BUC 0
:I/O: CD IC Data input / output.
pin 50: BUC 1
:I/O: CD IC Data input / output.