Diagrams; Ic Pin Function Description - Sony ICF-CD2000 Service Manual
Fm/sw/mw cd clock radio
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Also See for ICF-CD2000:
- Operating instructions manual (14 pages) ,
- Manual (3 pages) ,
- Operating instructions (2 pages)
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Focus bias Check
Condition:
• Hold the set in horizontal state.
Check Procedure:
oscilloscope
(AC range)
MAIN board
TP (RF)
+
TP (VC)
–
(See page 14)
1. Put the disc. (YEDS-18)
2. Set the equipment to service mode stop state. (See page 11)
3. Connect the oscilloscope to the test point TP (RF) on the MAIN
board.
4. Move the optical pick-up to the center by pressing the >
and . keys.
[BAND]
5. Press the
key. (Both tracking and sled are turned ON)
6. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.
RF Signal Reference Waveform (Eye Pattern)
VOLT/DIV : 200 mV (With the 10:1 probe in use)
TIME/DIV : 500 ns
RF level
0.9 to 1.3 Vp-p
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy watch-
ing.
7. Stop revolving of the disc motor by pressing the
[ OFF ALARM RESET]
x
key.
8. After the completion of adjustment, reset service mode. (See
page 11)
Check Location: MAIN Board (See page 20)
– 19 –
Check Location:
– MAIN Board (Conductor Side) –
TP
(MDV)
TP
(DV)
TP
(+3.4V)
TP
(OPDV)
TP
(+3V)
TP
(POWER +B)
TP
(RF)
TP
TP
(GND)
(VC)
TP
TP
(PRE VC)
(TE)
TP
(PRE +B)
– 20 –
SECTION 7
DIAGRAMS
7-1. IC PIN FUNCTION DESCRIPTION
• LCD BOARD IC401 LC867124A-5M74 (SYSTEM CONTROLLER, LCD DRIVER)
Pin No.
Pin Name
I/O
Description
C2 flag shock detection once danger signal output to the LC78626KE (IC502)
1
SHOCK
O
"L": shock detection danger
2
PAUSE
O
Pause signal output to the LC78626KE (IC502) "H": pause
3
WOK
O
D-RAM writing enable signal output to the LC78626KE (IC502) "H": writing enable
4
BUZ
O
Buzzer sound drive signal output terminal
External reset signal output to the CD control signal counter (IC404) and LC78626KE (IC502)
5
CORES
O
"L": reset
6
LMT
I
Sled limit-in detection switch (S603) input terminal
System reset signal input from the reset signal generator (IC402) "L": reset
7
RES
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
8
XT1/P74
I
Sub system clock input terminal (32.768 kHz)
9
XT2/P75
O
Sub system clock output terminal (32.768 kHz)
10
VSS1
—
Ground terminal
11
CF1
I
Main system clock input terminal (3 MHz)
12
CF2
O
Main system clock output terminal (3 MHz)
13
VDD1
—
Power supply terminal (+2.8V)
Key input terminal (A/D input)
14
KEY1
I
S402, S403, S421, S422, S424 (WORLD/LOCAL, D.S.T. SUMMER T., ESP, CD PLAY
MODE, CLOCK) keys input
Key input terminal (A/D input)
15
KEY2
I
S711 to S715 (TUNE/SCAN TIME SET – ., ALARM TRACK/STATION, ALARM TIME,
ALARM MODE, BAND) keys input
Key input terminal (A/D input)
16
KEY3
I
S706 to S710 (STATION zSELECT/zPRESET 1/2/3/4/5) keys input
Key input terminal (A/D input)
17
KEY4
I
S701 to S705 (TUNE/SCAN TIME SET + >, SNOOZE SLEEP OFF/LIGHT, x OFF
ALARM RESET, RADIO SLEEP, CD u ) keys input
18
OPEN
I
CD door open/close detection switch (S423) input terminal
19
AFC
O
AFC control signal output to the CXA1111N (IC1) when FM reception
Input of monitor signal of constant-voltage power supply generated form CXA1111N (IC1)
20
REG
I
(A/D input)
21
BATT
I
Battery voltage detection input terminal
22
EMPN
I
D-RAM low capacity alarm signal input from the LC78626KE (IC502) "L": less capacity
Data connection point detect completion signal input from the LC78626KE (IC502)
23
CNTOK
I
"H": detection completed (D-RAM writing starts)
D-RAM writing interruption signal input from the LC78626KE (IC502)
24
OVR
I
(RZP pulse signal input in case of overflow or shock)
25
DRF
I
DRF (focusing detection) signal input from the LA9251M (IC501)
26
WRQ
I
Subcode Q output standby input from the LC78626KE (IC502)
27
C2F
I
C2 flag signal input from the LC78626KE (IC502)
28
AC IN
I
Power failure detection input terminal "L": power on, "H": power failure
29
SHIFT
O
Shift clock output of the main system clock (3 MHz) "H" active
30
BEEP MUTE
O
Beep sound muting on/off control signal output terminal "L": muting on
31 to 40
S4 to S13
O
Segment drive signal output to the liquid crystal display (LCD401)
41
VDD3
—
Power supply terminal (+2.8V)
42
VSS3
—
Ground terminal
43 to 60
S14 to S31
O
Segment drive signal output to the liquid crystal display (LCD401)
– 21 –
Pin No.
Pin Name
I/O
Description
61
CE2
I
Setting terminal for the model Not used
62
CE3
I
Setting terminal for the model
"L": ICF-CD2000, "H": ICF-CD2000S
63
J
I
Setting terminal for the model
"H": E, Singapore, Tourist model
64 to 67 COM0 to COM3
O
Common drive signal output to the liquid crystal display (LCD401)
68
VSS2
—
Ground terminal
69
VDD2
—
Power supply terminal (+2.8V)
70
CD ON
O
Power on/off control signal output for the CD mechanism section "L": power on
71
TU ON
O
Power on/off control signal output for the tuner section "L": power on
72
A MUT
O
Audio line muting on/off control signal output terminal "L": muting on
LED drive signal output of the liquid crystal display (LCD401) back light (D405 to D408)
73
LED ON
O
indicator
74
SL –
O
Sled servo drive signal output to the LA9251M (IC501)
75
SL +
O
Sled servo drive signal output to the LA9251M (IC501)
76
RCK
O
Serial data latch pulse signal output to the CD control signal counter (IC404)
At tuner mode : PLL serial data latch pulse signal output to the FM/AM PLL (IC3)
77
RWC
O
At CD mode : Reading/writing control signal output to the LC78626KE (IC502)
(shumitt output)
At tuner mode : PLL serial data input from the FM/AM PLL (IC3)
78
COIN
I
At CD mode : Command serial data input from the LC78626KE (IC502)
At tuner mode : PLL serial data output to the FM/AM PLL (IC3)
79
SQOUT
O
At CD mode : Subcode Q data output to the LC78626KE (IC502)
At tuner mode : PLL serial data transfer clock signal output to the FM/AM PLL (IC3)
80
CQCK
O
At CD mode : Subcode Q data reading clock signal output to the LC78626KE (IC502)
– 22 –
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