Clarion 28188 2Y900, Service Manual, Page: 4 / 22

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PN-2280D
■ ADJUSTMENT
Switch of diversity
※
How to fix the MAIN channel.
While holding the buttons of CH1 and CH3, turn on the power switch.
※
How to fix the SUB channel.
While holding the buttons of CH4 and CH6, turn on the power switch.
※
To release the MAIN or SUB channel, turn off the power switch.
FM noise
convergence
FM SD
Item Procedure
Measuring
instrument
Dolby level
MAIN channel
1. Fix the MAIN channel.
2. Input the 98.1MHz/55dB
μ (1kHz 30%MOD) signal. (VOL 1.4V=0dB)
3. Adjust the outputs to − 18 ± 1dB( − 14 ± 1dB) by VR101 when the SG output is
set − 20dB μ .
SUB channel
1. Follow the same adjustment steps as MAIN above.(by VR100)
1. Input a 98.1MHz/31dB μ (1kHz 30%MOD) signal.
2 Connect OSC to TP100(SD), and adjust VR102 so that the reading of OSC is
0V to 6V.
1. Insert a Dolby level test tape(400Hz,200nWb/m).
2. Adjust VR1(L)/VR2(R) so that an output of TP401(L)/TP400(R) is 300mV
± 1dB.
(Dolby sw:off)
SSG
AC volt meter
SSG
Oscilloscope
Dolby level tape
Milli-volt meter
■ EXPLANATION OF IC
■ μ PD17718GC-528-3B9 052-1147-30 Tuner / Tape / CD Auto
changer / CD Controller
1.Outward Form : 80 pins QFP
2.Terminal Description
pin 1 : ACC IN : IN : Acc-ON-signal input. Negative logic.
pin 2 : CD EJ : IN : CD-eject-signal input. Negative logic.
pin 3 : TAPE EJ : IN : Tape-eject-signal input. Negative logic.
pin 4 : VOL 1 : IN : Main volume control signal input.
pin 5 : VOL 2 : IN : Main volume control signal input.
pin 6 : FL DO : O : Serial data output to VFD-driver.
pin 7 : FL CL : O : Serial data clock output to VFD-driver.
pin 8 : FL CE : O : Chip-enable signal output to VFD-driver.
pin 9 : KS 0 : O : Key scan signal output. Ref. Table 3.
pin 10 : KS 1 : O : Key scan signal output. Ref. Table 3.
pin 11 : KS 2 : O : Key scan signal output. Ref. Table 3.
pin 12 : KS 3 : O : Key scan signal output. Ref. Table 3.
pin 13 : KS 4 : O : Key scan signal output. Ref. Table 3.
pin 14 : KS 5 : O : Key scan signal output. Ref. Table 3.
pin 15 : POWER SW : IN : Power Key input(alternative). Negative
logic.
pin 16 : KR 4 : IN : Key scan signal input. Ref. Table 3.
pin 17 : FL ON : O : Filament-ON signal output to VFD-driver.
pin 18 : SYS ON : O : System-ON signal output. (Hi-Z)
pin 19 : FM ON : O : FM-ON signal output. (Hi-Z)
pin 20 : AM ON : O : AM-ON signal output. (Hi-Z)
pin 21 : GND : - : Ground.
pin 22 : KR 3 : IN : Key scan signal input. Ref. Table 3.
pin 23 : KR 2 : IN : Key scan signal input. Ref. Table 3.
pin 24 : KR 1 : IN : Key scan signal input. Ref. Table 3.
pin 25 : KR 0 : IN : Key scan signal input. Ref. Table 3.
pin 26 : ILL DC : IN : VFD-brightness control signal input.
pin 27 : REEL PULS : IN : Reel pulse input.
pin 28 : AM IF : IN : AM-IF counter input.
pin 29 : FM IF : IN : FM-IF counter input.
pin 30 : VCC : - : Positive voltage input.
pin 31 : FM OSC : IN : FM VCO ( Local Oscillation ) input.
pin 32 : AM OSC : IN : AM VCO ( Local Oscillation ) input.
pin 33 : GND : - : Ground.
pin 34 : N.C. : O : Not in use.
pin 35 : EO : O : Error out terminal.
pin 36 : GND : - : Ground.
pin 37 : RE MUTE : O : IF-output control. Output "H" in SEEK.
pin 38 : DX/LO : O : "L" = ( AM SEEK ) & ( ILL ON )
"H" = ( FM ) & ( Sub fixed )
pin 39 : TWEET : O : In AM mode, Output "L" in receiving
900kHz.
In FM mode, Output "H" in Main-fixed
mode.
pin 40 : BEEP : O : Beep out.
pin 41 : ILL PULSE : IN : ILL-pulse input.
pin 42 : TEL ON : IN : Tel-on signal input. Negative logic.
pin 43 : DOLBY : O : "H" = DOLBY on.
pin 44 : T/R : O : "H" = Mechanism mute on.
pin 45 : F/R : O : "H" = forward ( Tape ).
"L" = reverse ( Tape ).
pin 46 : MS : IN : Music sensing signal input. "H" = non-re-
corded.
pin 47 : TAPE IN : IN : Tape loading start signal input.
pin 48 : BIT 3 : IN : Mechanism mode switch signal input.
Ref. Table 1.
pin 49 : BIT 2 : IN : Mechanism mode switch signal input.
Ref. Table 1.
pin 50 : BIT 1 : IN : Mechanism mode switch signal input.
Ref. Table 1.
pin 51 : MSGV : O : Music sensing amplifier sensitivity control
signal output. "H" = play, "L" = FF/Rew.
pin 52 : M-MOTOR : O : "H" = Main motor on.
pin 53 : P2 : O : Power motor control. Ref. Table 2.
pin 54 : P1 : O : Power motor control. Ref. Table 2.
pin 55 : VOL STB2 : O : STB2 output for electric volume IC
TC9412F.
pin 56 : VOL STB1 : O : STB1 output for electric volume IC
LC75386.
pin 57 : VOL CLK : O : Serial data clock output for electric vol-
ume IC.
pin 58 : VOL DATA : O : Serial data output for electric volume IC.
pin 59 : AF MUTE : O : Audio frequency mute signal output. Neg-
ative logic.
pin 60 : AMP ON : O : "H" = Power amplifier on.
pin 61 : R VOL DW : IN : Remote control volume input.
pin 62 : R VOL UP : IN : Remote control volume input.
pin 63 : MODE C : O : Remote control mode indicator output.
pin 64 : MODE B : O : Remote control mode indicator output.
pin 65 : MODE A : O : Remote control mode indicator output.
pin 66 : CD RESET : O : Reset signal output to CD mechanism
controller. Negative logic.
pin 67 : CD SRQ : IN : C-BUS service request signal input. "L" =
CD mechanism controller request.
pin 68 : NDS REQ : IN : Request input from NDS-A/C.
pin 69 : NDS TXD : O : TX output to NDS-A/C.
pin 70 : NDS RXD : IN : RX input from NDS-A/C.
pin 71 : CD SCK : O : C-BUS clock output.
pin 72 : CD SI : IN : C-BUS serial data input.
pin 73 : CD SO : O : C-BUS serial data output.
pin 74 : REG : - : Connects a capacitor to reduce voltage
regulator ripple.
pin 75 : GND : - : Ground.
pin 76 : XOUT : O : Connects a crystal.