Service manual

82
Table 6-1. Signal-Name Descriptions (continued)
Mnemonic Function Sheet 1 Sheet 2 Sheet 3
PTX1 \
5B
, 8A
PTX2 |
5B
, 8A
PTX3 |
5B
, 8A
PTX4 |---- Serial data to modules (D)
5B, 8B
PTX5 |
5B
, 8B
PTX6 |
5B
, 8B
PTX7 /
5B
, 7B
P_TRIG* Trigger signal from controller (D)
3A, 5B
READ_TRIG
Indicates to
µP that a trigger has occurred (D)
3B, 3D
R/W* RAM read/write (D)
4C, 6C
RESET_TRIG
Resets trigger latch after
µP reads it (D)
3A, 4B
SA_GATE
Primary-
µP SA gate (D)
4D, 8C
SA_MODE
Primary-
µP SA mode enable (D)
8C, 4C
SC0 \
2C
5B
SC1 |---- Module address to serial data port (D)
2C
5B
SC2 /
2C
5B
SER_IN
Serial data input to
µP (D)
4D
4A
SER_OUT
Serial data output from
µP (D)
4D
5B
SIOEN* Module I/O enable (D)
2C
5B
TRIG_EN Trigger enable/disable (D)
2C
8D, 6C
TRIG* Trigger developed from 1-of-4 sources (D)
6A
7A, 5C
TRIG_IN External trigger input (D)
2A, 6B
TRIG_OUT Trigger output (D) 2A
3B
TSET Trigger input to trigger latch (D) 4A
3C
X AC in to line-sense and line-sync circuits
6B, 8C,
5D
XFER_1 \_______________
AC supply to Fan 2
7C, 1D
XFER_2 /
7B
, 1D
XFER_3 \_______________
AC supply to Fan 1
7B, 1C
XFER_5 /
7A
, 1C
Y AC in to line-voltage sense circuit
6A, 5D
ZERO_REF Reference for line-sync circuit
4D, 7C
1_MODULE_INSTALLED* At least one module is installed (D) 8C, 4A
2_MODULES_INSTALLED* At least two modules are installed (D) 8C, 4A
3_MODULES_INSTALLED* At least three modules are installed (D) 8C, 4A
4_MODULES_INSTALLED* At least four modules are installed (D) 8C, 4A
5_MODULES_INSTALLED* At least five modules are installed (D) 8C, 4A
6_MODULES_INSTALLED* At least six modules are installed (D) 8C, 4A
50*/60 Line-frequency fan-speed compensation (A)
2C
3C, 3B