Akai AT A2 AT A2 L Schematic

Page 1

AKA]

MODELAT-A 2 /I.

SCHEMATIC. DIAGRAM
AND PC BOARD

1. SCHEMATIC DIAGRAM OF 1C5 ............................ l
2. AT-AZ N0.840821A SCHEMATIC DIAGRAM ................... 2
3. CONTROL PC BOARD, POWER SW (1), (2), TUNER PC BOARD ..... 3
4. CONTROL PC BOARD, POWER SW (2), TUNER PC BOARD ........ 4
5. AT-A2 L NO.840822A SCHEMATIC DIAGRAM ................. 5
6. AT-A2 N0.840820A BLOCK DIAGRAM ...................... 6

TC917I

Pin No.17

l

coauaxmhwtx:

10

Symiboli 7
GND7 7 D
REF
so

SI
CK
STE

ASTP
IF-IN
1N1
0T1
0T3

GND

Description

Reference Frequency/Input Terminal from UOCOM (TC9303N)
Serial Data Output Terminal to U-COM (TC93031N)
Serial Data Input Terminal from U-COM (TC-9303N)

Clock Signal Terminal
Strobe Signal Terminal
Not used

AM/FM-IF signal Input Terminal (Auto scan stop DET)

Not used

,
Pin No. Symbol

Description

12 0T3 Control output H-MONO/LSTEREO
13 0T4 Control output H"-LW MODE AT-A2L only
14 0T5 Control output H"-MW MODE AT-AZL only
l 15 0T6 Control output H»FM MODE/L"VAM MODE
16 D02 Not used
17 D02 Control output of Tuning Voltage
18 TEST Not used
19 AM-IN AM osc Signal Input Terminal
20 GND GND
21 FM-IN FM OSC Signal Input Terminal
l_ 32 V99 :SV 7 7 7 7 7
TC9303
1 Pin, No. Symbol Description 7
l 2 K0
I I Key Matrix Data Input
5 K3
6 DO 1G
I I 3 Digit Output
12 D7 76
13 a a 7 7 7 7
z z fIEIb 7 Segment and Dot FL drive
19 g -‚¬I_Ic -h
20 h
4 D NE 43 W 7
22 P31 7 7 7
FM-AM step Frequency control
t Z Disnation
25 P34 FM OSC Frequency control
26 P21 P22 V .TFLD TUNED Control Input (PP-W
8 2
29 P23
l so P12 N31 used 7 T 7 7
l 3] MUTE Mute Control I-I'T: Mute 7 (scaning and cheng ofbonji) 7 D
l 32 7 TEST 7 _Not used 7 7
33 5TB Strobe signal Terminal
34 CK Clock signal Terminal
35 SO Serial Data Output Terminal to PLL (TC9171)
36 SI Serial data Input Terminal to PLL (TC9171)
37 REF Reference Frequency Output Terminal to PLL(TC9171)
38 TNT
39 [NH
40 XT
41 XT Xtal Terminal
42 VDD +5V
1 GND GND