Revision B • 7/00
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5 Maintenance & Alignment
No Clock nor Timer display:
Check for +12 volts on
J1 or J2, pin 5. Check for +8 volts at the
output of U5 and for +5 volts on U4. Check
for clock signal at CLK.
Clock Frozen:
U8 shorted.
Clock rapidly incrementing:
U6 shorted.
Clock runs very fast:
U7 shorted.
Timer doesn’t work in manual mode:
Shorted Reset
or Hold switch or open Start switch.
Timer doesn’t work in Auto mode:
Auto switch not
turned on. Timer Reset switches on the In-
put modules are not set On or not set for the
selected input (A or B).
One or more segments out:
Each numeric character
is an identical independent seven-segment
display in a socket, so substitution can iden-
tify if the display or the driver is defective.
Note:
Some of the seven-segment displays
are mounted upside down to form the up-
per dot in the H:M:S divider colons.
TIMER CONTROL MODULE
The Keep Alive voltage is generated by two
Lithium AA batteries on the Timer Control Panel.
These batteries power the gate arrays during power
outages so the console powers back up in the same
state it was in when power was lost. There are no
adjustments or DIP switches on this board.
CUE SPEAKER REPLACEMENT
The Cue speaker is 45 ohms/3 watts. To test the
speaker, remove the speaker leads and check the
impedance. To replace the speaker, remove the four
mounting nuts, lock washers and washers from
the speaker. The speaker must be angled on its
mounting screws to clear the meter panel.
AIRWAVE UNIVERSAL POWER SUPPLY
Periodically check that the vent openings on the
top of the chassis are not blocked and that there
is no dust buildup on the heat sink fins.
Caution:
To reduce the risk of electric shock,
perform no servicing other than the fuse re-
placement unless you are qualified to do so.
Refer servicing to qualified service personnel.
Fuse Replacement
The AC line fuse in the power entry module
(PEM) is the only user-replaceable component in
the supply. To access the fuse, unplug the AC cord
and use flatblade screwdriver to pop the top of
the PEM coverplate.
115 VAC supplies use a 2.50 amp slo-blo UL-
type fuse. 230 VAC supplies use a 1.25 amp slo-
blo IEC-approved fuse. Verify the correct AC mains
voltage appears in the PEM cutout after the cov-
erplate is snapped back into place.
If the fuse blows again, switch off the power
supply, unplug the console DC cable and replace
the fuse. If this fuse blows, a serious problem is
indicated within the power supply. If the fuse does
not blow, a problem likely exists in the mainframe.
In either case, refer servicing to qualified service
personnel.
Refer to the AirWave Universal Power Supply
manual (PR&E 75-41) for servicing information.
1
2
3
4
5
6
7
8
9
10 11 12
PIN
SIGNAL
WIRE COLOR
1
+45 V, phantom
Green/Black
2
+16 V, audio
Red
3
Phantom GND
Green
4
Audio GND
Black
5
Audio GND
White
6
-16 V, audio
White/Black
7
+12 V, Lamps
Red/Black
8
+5 V, Logic
Orange
9
Logic GND
Blue
10
No Connection
11
No Connection
12
No Connection
Molex Power Supply Connector
