akira CT-21XF9, Service Manual

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Model No: CT-21XF9A
Version 1.0
2. INTRODUCTION FOR CPU IC TMP87CM38N-3673 (N001)
The pin functions and repair data of TMP87CM38N-3673 is listed in the table 4.
Table 4 Pin functions and repair data of TMP87CM38N-3673
Index type multimeter (r=20k )
Resistance for GND
(RxlK)
Pin Symbol Function
Quiescent
state (v)
Dynamic
state (v)
Red pen
measure Black pen
measure
1 Vss Ground 0 0 0 0
2 VT
Tuning voltage output
PWM phase-reversed
wave.
1 0.1 6 19
3 KARA-ENA NC 0 0 6 21.5
4 MUTE
Sound mute signal output,
high level=Mute
4.9 0 6 21.5
5 EXT-MUTE NC 0 0 6 13.5
6 S.ID NC 0 0 6 23.5
7 POWER
Supply on/off control
signal output, high level =
off, low level = on
4.9 0 6 21.5
8 KARA-CLK NC 0 0 6 23.5
9 BAND1
Tuner band switching
control signal output
4.9 5 6 16.7
10 BAND2
Tuner band switching
control signal output
0 0 6 14
11 SCL1 Inter IC Bus clock line 4.3 4.3 5.8 21.3
12 SDA1 Inter IC Bus data line 1 4.5 4.5 5.6 21.3
13 AFC IN
Automatic frequency
control input
0 1.8 6 10
14 AV0
AV switch control signal
O output
0 4 6 18
15 EXT G IN NC 0 0 0 0
16 EXT B IN
Keypad analog voltage
input 1
4.2 4.2 6 21.5
17 RGB VCC
Keypad analog voltage
input 2
4.2 9 6 24.8
18 R OUT
Supply protect checkout
signal input, low level=
protect
1.8 4.9 6 24.8
19 G OUT NC 0 0 6.4 28
20 B OUT BUS on/off control output 4 3.9 6 21.5
21 ABCL Ground 0 0 0 0
22 R OUT OSD character It output 4.4 0 1.4 1.3
23 G OUT OSD character G output 4.5 0 1.4 1.3
24 B OUT OSD character B output 4.5 0 1.4 1.3
25 Y OUT
Character window
signal/fast blanking signal
for OSD 4.5 0 2 2