Samsung FACSIMILE SF40 Service Manual page 35

DO
D1
D2
D3
D4
D5
D6
D7
RSO
RS1
RS2
RS3
RS4
cs
READ(02)
WRITE(R/W)
iRQ
+5VD1 +5VD2 +5VA_ ENB86
BYPASS
POR
ADOUT
ADIN
RCVO
RCV1
RXIN
R96DFXL ~~ aout
PQFP RAMPIN
AGD
OVA
XCLK
YCLK
TXOUT
DAOUT
DAIN
oVvD2
ovD1
SWGAINO
SWGAIN1
U9
EYEX TXLOSS3
EYEY TXLOSS2
EYECLKX4
TXLOSS1
EYECLK
ECLKIN1
EYESYNC
SYNCIN1 QP16-17
SYNCIN2 QP19-21
QP02,03-07
QP11,13
[Fig. 17]
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5) Pin Description
Pin No. | Signal Name Description Pin No. | Signal Name Description
1 GPO3 General Purpose Input Output 51 NC
2 GPO4 General Purpose Input Output 52 ARQ Interrupt Request
3 GPO5 General Purpose Input Output 53 WRITE WRITE Enable
4 GPO6 General Purpose Input Output 54 /CS Chip Select
5 GPO7 General Purpose Input Output 55 /READ Read Enable
6 OVD2 Connect to Digital Ground 56 RS4 Register Select 4
7 OvbD2 Connect to Digital Ground 57 RS3 Register Select 3
8 D7 Data Bus Line7 58 RS2 RS2Register Select 3
9 D6 Data Bus Line6 59 RS1 Register Select 1
10 D5 Data Bus Line 5 60 RSO Register Select 0
L 11 D4 Data Bus Line 4 | 61 GP13 General Purpose Input
12 D3 Data Bus Line 3 | 62 NC
13 D2 | _Data Bus Line 2 | 63 GP11 General Purpose Input
14 D1 Data Bus Line 1 | 64 /RTS
15 DO Data Bus Line 0 | 65 /EN85 Enable 8085 Bus
16 OvD2 Connect to Digital Ground | 66 OVvD2 Connect to Digital Groud
17 OVA Connect to AnalogOV Ground || 67 | /PORI | Power-ON-Reset Input
| 18 RAMPIN Receiver Amplifier Input oe Connect to Crystal
119 NC | 69 | XTLO Connect to Crystal
20 | 70 [| XCLK | 12MHz Output
| 21 OVA Connect to Analog OV Ground 71 6MHz Output
| 22 Connect to Digital +5V Power 72 +5VD2 Connect to +5V Digital Power
23 Connect to Digital Ground [73 [ DCLKI | ConnecttoDCLK
| 24 SWGAIN1 Connect to SWGAINO | 74
| 25 Connect to EYECLK 75 GP16 General purpose Input
| 26 SYNCIN1 Connect to EYESYNC | 76 GP17 General purpose Input |
| 27 NC | 7 | ovoe Connect to EYESYNC
28 | NC | ICTS
|__29 TXD
30__| OVA comes mag 7a' | to over {Some la rd
31
32 | 82 | DCLK.
33 NC | 83 | EYESYNC | Serial Eye Pattern Strobe
34__| DAIN Connect to DAOUT | 84 | EYECLKX | Serial Eye Pattern Clock |
35 ADOUT ADC OUT EYECLK Serial Eye Pattern Clock
Receive High-pass Filter | 56 EYEX Serial Eye Pattern X Output
Connect to RCVO 87 ADIN Connect to ADOUT
2dB of Analog Tx Level Att 88 DAOU DAC/AGC Output
4qB of Analog Tx Level Att. 89 OVD2 Connect to Digital Ground
8dB of Analog Tx Level Att. 90 EYEY Serial Eye Pattern Y Output
91 GP21 General purpose Input
92 OVD2 Connect to Digital Ground
Connect to Analog OV Ground 93 GP20 | General purpose Input
Connect to TXA Filter Input 94 GP19 | General purpose Input
Connect to RXA Filter Output 95 RXD | Receive Data
Receive Line Signal Detected
Connect to Digital Ground
Mode Select Output
Connect to SWGAIN1
General purpose Input Output
46 +5VA Connect to Analog +5V Power|| 96 /RLSD
47 Connect to Analog OV Gronud || 97 OVD2
48 AGD +2.5V Analog Ground | 98 RCVO
49 AOUT Smoothing Filter Output | 99 SWGAINO
50 OVD1 Connect to Digital Ground 100 GP02
5. LIU PBA. UNIT
The LIU PBA Unit composed of the following 4 sections:
* Telephone (No Power Operation)
¢ Ringer and Ring detect
¢ Signal/Data Interface
¢ Hook detect
* Telephone Section
in the off - hook state , the phone line is connected to rectifier.
Diode BD1 through SW-3 and speech network IC U2.
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