Toshiba ESTUDIO170F, Service Manual

Page: 281 / 492

7
January 2005 © TOSHIBA TEC e-STUDIO170F Circuit Description
7 - 51
48 USBRESX O USB controller reset signal (Low-active)
Resets the USB controller (IC49).
49 CML O CML relay control signal (H: MODEM, L: Telephone)
Switches the CML relay installed on the NCU PBA.
50 LD O Dial pulse generation signal (H: Dial make)
Sends a dial pulse to the telephone line.
53 ERCL/HOOK O External TEL relay control signal (H: External TEL hook
detection L: Normal)
Switches the external TEL relay installed on the NCU
PBA.
54 ATT3DB O Attenuator control signal (H: 3dB inserted)
Connects the attenuator to attenuate the reception
level by 3dB.
55, 57 RLADJ1, 2 O Return loss adjust signal
Adjusts the return loss by switching the circuit.
RLADJ2 RLADJ1
L L SG, HK
L H Not used
H L AU, NZ
H H CTR21
58 NCUOUT O External TEL ring generate signal
Outputs a clock for the external TEL ring signal.
59 HLEB7 - Not used (Open)
62, 63 HSER6, 7 - Not used (Open)
64 PRRDYX I Printer ready signal (Low-active)
The Engine-CPU indicates to the ASIC (I/O port) that
print operation is ready.
65 EPRDYX I Engine power ready signal (Low-active)
The Engine-CPU indicates to the ASIC (I/O port) that
sending and receiving of signals is ready.
66 CPVOP I Cover open detect signal (L: Front or RX cover
opened)
The Engine-CPU indicates to the ASIC (I/O port) that
the front or RX cover is opened.
67 PUDETI I CSIC PBA output signal
Communication data from the CSIC PBA of the toner
cartridge.
68 ILSW I +24VILS detect signal
Detects the +24VILS voltage outputs.
69 MDSEL - Pull-up: +5V
70 5VRESX I Reset signal (Low-active)
Resets the system.
72 PWRSVNACK O Power save non-acknowledge signal (Low-active)
Indicates return from the Super Power Save mode to
the Sub-CPU.
73 PUDETO O CSIC PBA input signal
Communication data to the CSIC PBA of the toner car-
tridge.
74, 75, 76, 78, 79 HCTR1, 2, 3, 5, 6 - Not used (Open)
77 PM22PLL O CODEC PLL control signal
Control signal for PLL function of the CODEC (IC16).
80 G1HZ - Not used (Open)
Pin No. Signal name I/O Function