Kenwood RXD-655 Service Manual page 12

RXD-655/755
2-2 RDS Demodulation LSI(TUNER Section, ICT21)
Port No. Port Name
1 VREF
2 MPXIN
3 VDDA
4 VSSA
5 FLOUT
6 CIN
7 TEST
8 XOUT
9 XIN
10 VSSD
11 VDDD
12 MODE
13 RST
14 RDDA
15 RDCL
16 RDS-ID/READY
3. Test Mode
3-1 How to Set up the Test Mode
• During POWER OFF mode, push below each 2 keys and [POWER] key.
Then go to each TEST MODE.
KEYS
[ POWER ] [ SOUND ] + [ CD ]
[ POWER ] [ SOUND ] + [STOP ]
[ POWER ] [ TUN DOWN ] + [ TUNER ]
[ POWER ] [ REC ] + [ CD ]
3-2 Cancelling the Test Mode
• Turn the power off.
12
CIRCUIT DESCRIPTION
I/O
O Reference voltage output.
I Baseband (multiplexed) signal input.
- Analog power supply (+5V).
- Analog ground.
O Subcarrier output (filter output).
I Subcarrier input (comparator input).
I Test input.
O Crystal oscillator output (4.332MHz).
I Crystal oscillator input (4.332MHz).
- Digital ground.
- Digital power supply (+5V).
I Read mode setting (0 : master, 1 : slave).
I RDS-ID/RAM reset (positive polarity).
O RDS data output.
I/O RDS clock output (master mode)/RDS clock input (slave mode).
O RDS-ID/READY output (negative polarity).
TEST MODE
CD TEST MODE
ALL CLEAR (RESET)
PRODUCTION INITIALIZE FOR
CHANGER
CD CHANGER TEST
Function