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HL-2030/2040/2070N SERVICE MANUAL
Confidential
3-5
The functions of the interface block communication with external devices are described below;
1.3.2 USB
interface
Stores the data received from the PC into DRAM as controlled by the DMA controller. The
transmission speed is 12Mbps.
< HL-2030/2040 >
R50
100k
ZD3
R65
1M
ZD2
UDZS6.8B
IF_FG
0V
R68
22k
0V
ZD1
TP71
0V
C35
C101
R49
1.5k
0V
TP47
4C
USBDN
4C
USBDP
4C
USBCTL
3C
USBVCC
C52
C101
0V
R27
27
R26
27
TP30
TP24
CN5
1
PC5V
3
DP
2
DN
4
GND
5
FG
UBR24-4K2300
6
FG
USB
Fig. 3-5
< HL-2070N >
R33
100k
R32
1M
IF_FG
0V
R37
22k
0V
TP42
0V
C43
C101
R34
1.5k
0V
TP49
2F
USBVCC
C42
C101
0V
R25
27
R23
27
C36
C68P
C38
C68P
0V
TP31
TP21
U6
MB87S1200
USBCTL
172
USBDP
170
UDBDN
169
DA1
DF5A6.8FU
C3
C1
C2
A
C4
CN5
1
PC5V
3
DP
2
DN
4
GND
5
FG
UBR24-4K2300
6
FG
NC
USB
Fig. 3-6