Pioneer DEH-2237ZF X1R/UC, Service Manual

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DEH-2237ZF/X1R/UC

No. Symbol I/O Explain

1 STIND

O

stereo

"Low" when the FM stereo signals are received.

indicator

To be pulled up to the "VDD" at 47k

Ω

.

2 FMSD

FM station

"High" when signals are received. To be pulled up to the "VDD" at 47k

Ω

detector

Meanwhile, 10k

Ω 

should be used when taking diver FIX trigger from here

and "High: 0.9VDD or more" and "Low: 250mV or less".
(Should satisfy the diver IC specifications) 

3 NL1

O

noise level-1

"High" when noise is received.  Output for the RDS. GND at 47k

Ω

//1,800pF.

4 NL2

O

noise level-2

"High" when noise is received.  Output for the RDS. GND at 36k

Ω

//330pF.

5 Rch

O

R channel

FM stereo "R-ch" signal output or AM audio output.

output

Add the specified de-emphasis constant. 

6 Lch

O

L channel

FM stereo "L-ch" signal output or AM audio output.

output

Add the specified de-emphasis constant. 

7 WC

write control

EEPROM write control.  Writing permissible at "Low". Normally open.

8 SDBW

O

SD bandwidth

SD bandwidth signal output.  For detection of detuning data for the RDS.

9 AMDET O

AM detector

AM detector output.  r out < 100

Ω

output

10 VDD

power

Power supply pin for the digital section.

supply

DC 5V +/- 0.25V. Be careful about overlapping noise in the logic section.

11 DGND

digital ground

Grounding for the digital section.

12 CE2

I

chip enable-2

EEPROM chip enable.  Active a "Low"
To be pulled up to the "VDD" at 47k

Ω

13 SL

I/O signal level

Received FM/AM signal level (strength) output.
Connect the specified load resistor and capacitor (10k 

Ω

+ 39k 

Ω

//4,700pF)

14 DI/DO

I/O data input/

Data input/Data output

data output

To be pulled up to the "VDD" at 47k

Ω

15 CK

I

clock

Clock input To be pulled up to the "VDD" at 47k

Ω

16 CE1

I

chip enable-1

AF·RF chip enable.  Active at "High"To  be grounded at 47k

Ω

17 AMPNS

AM PNS IF signal IF signal output for AM PNS circuit.

18 LDET

O

lock detector

Active at "Low".  To be pulled up to the "VDD" at 47k

Ω

19 CREQ

I

current request

Active at "Low".  To be grounded at 47k

Ω

20 AMINI

AM audio input

The frequency response and the level are set by connecting an external CR
network with terminal AMIN as terminal AMDET.  r in = 50k

Ω

21 COMP

O

composite signal

FM composite signal output.  r out < 100

Ω

22 VCC

power supply

Analog section power supply pin.DC 8.4V +/- 0.3V 

23 LOCH

I

local high

FM local high pin. When seeking local high, apply 5V together with "LOCL". 

24 FMLOCL I

FM local low

FM local low pin. When seeking local low, apply 5V to the base of the NPN 
transistor with which the specified resistor is being connected to the emitter. 
Keep it open in case of ordinary marketed models. 

25 LOCL

I

local low

FM/AM local low pin.  When seeking local low, apply 5V to the base of the 
NPN transistor.Since this pin is exclusive for AM when the FMLOCL is in use,

do not drive it under FM. 

26 RFGND

RF ground

Grounding for the antenna section.

27 FMANT I

FM antenna input FM antenna input.  75

Ω

. Surge absorber (DSP-201M-S00B) is necessary.

28 AMANT I

AM antenna input AM antenna input.  High impedance.

Connect to the antenna through an L (LAU type) of 4.7

µ

H.To cope with the

power transmission line hums, insert a series circuit consisting of an L
(a coil of about 100mH) + R (a resistor of 470 

Ω 

to 2.2k

Ω

) between the GND.

IC 3

EEPROM

28

27

FM/AM 1ST IF 10.7MHz

T51 Q51 CF51 CF52 CF53

IC1

MIXER, IF AMP, DET.

6

21

18

LDET

COMP

22

25

10

14

12 15 16

8

13

3

CF202

VDD

VCC

DI/DO

CE2

CK

CE1

SDBW

SL

FMSD

NL1

NL2

IC 2 FM MPX

AMANT

FMANT

ATT

ATT

AMRF

FMRF

IMG ADJ

RF ADJ

X901

10.25MHz

ANT ADJ

LOCL

23

LOCH

AMDET

MPXREF 41kHz

AM 2ND IF

450kHz

19

CREQ

11

DGND

1

STIND

L ch

5

R ch

9

24

AMDET

FMLOCL

20

17

7

AMPNS

WC

26

RFGND

AMIN

-

FM/AM Tuner Unit

O

O

4

2