Tweco 15XC Merlin - Manual (Page 100)

CUSTOMER/OPERATOR SERVICE 5-28 Manual 0-2251
5.12 SERVICE AND TEST PROCEDURES (continued)
1. Check the voltage input from F2 (wire #10) to J6-9 for
100 - 120 VAC. Check the input from F2 to J6-10 for 120
- 140 VAC.
2. If the voltage input is present, check the red LED indica-
tor (D18) on the voltage selection board. If the indicator
is lit, measure voltage output between F2 (wire #10) and
J6-7. If the indicator is not lit, measure between F2 and
J6-12. The voltage output at either point should meas-
ure 110 - 130 VAC.
3. If both or neither J6-7 or J6-12 have high voltage pres-
ent, replace the voltage selection board. Check voltage
between J6-21 and wire #10 on fuse F2 for 110 - 130
VAC. This supplies 120 VAC to the rest of the unit.
120 VAC Test
1. A shorted or frozen motor will cause F1 to fail. To
check the motors, disconnect J20 (pump motor) and J39
(fan motor). Reconnect one at a time to determine
which is component faulty. A shorted or open fan
motor starting capacitor (C32) may also cause F1 to fail.
2. F2 fuses the 110 VAC circuit. MC1 or MC2, T2 and the
gas solenoids are energized when power is first applied.
If shorted, any one of these components would cause F2
to fail. W1 or W2, PCR and T3 energize after the torch
switch or remote start switch is activated. Disconnect
all components and reconnect one at a time to establish
which component is faulty.
B. Blown Fuse (F1 or F2)
Figure 5-J 120 VAC Circuits
K1
J28 TO OPTIONAL STANDOFF CONTROL
T3(HF)
(94)
PSR
PCR
(881)
(89)
SW3-A
(5)
K5
LOGIC PCB
(75)
K3
(110)
SOL3 SOL2 SOL1
(50)
K4 K2
T2
-1 -3
(24)
VOLTAGE SELECTION PCB (24)
(23) K5 K5
(22) (21)
W2 W1 MC2 MC1
(4) (3)
K4 K3
K3 K4
(15)
(14)
T1
SW1-A
ON/OFF
(10) F2 (9) (8)
E-STOP
SWITCHING
CONTROL PCB
A-00965