Rowe 7770, Руководство по обслуживанию на поле и каталог запасных частей

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Part No. 900-68702
4 - 1
Section 4: Troubleshooting
Section 4:
Troubleshooting
INTRODUCTION
This section contains Troubleshooting
Charts, a Block Wiring Diagram, and an
Interconnect Block Diagram. The first
chart lists the error messages that may
be displayed while in the diagnostic mode.
The second lists possible problems and
suggested solutions.
Clear Errors
Diagnostic error messages are cleared
by pressing <RESET> while in the
diagnostic mode. Following a diagnostic
reset, “NO ERRORS” will be displayed
for 1 second.
Clearing errors does not
correct the problems indicated by the
error messages, it only removes the
message from the machine’s memory.
TROUBLESHOOTING
PROCEDURES
It is important to troubleshoot logically.
Many malfunctions are caused by minor
defects such as loose connections or dirty
contacts. Ensure that the vendor is con-
nected to a good power source and follow
the checklist at right before replacing any
parts.
Voltage and Polarity Check
With a voltmeter, check for proper
voltage, polarity and good ground using
the following example:
Check List
• Check circuit breakers. These are
located on the Transformer Box
assembly at the bottom left hand side
of the cabinet.
• Check to ensure that the Main power
switch is ON - located on the bottom
of the power panel.
• Check to ensure that all plugs are
firmly seated in their receptacles.
• Check to ensure that connector pins
are not bent, broken or pushed
through the back of the connector or
receptacle when mated.
• Check to ensure that wires are not
broken at connector pins.
Locating and Replacing Defective
Motors
1. Open the main door and check the
display for “OVER CRNT=” or
“HOME FAIL=” errors.
2. Record all the selection numbers
that follow these error messages.
3. Check all disabled selection helixes
for improper loading, jams, etc.
4. Run a single selection motor test on
each disabled selection by following
the instructions in Motor Count and
Test Vend on page 3-11.
5. If the motor fails to operate, first
check applicable wires and connec-
tors to the motor. Second, replace
defective motor assembly as follows:
a. Remove helix.
b. Insert hub removal tool (593-902)
and pull hub off.
c. Compress motor retaining tabs and
remove motor.
6. Run a test vend on repaired selections.
7. After all repairs are made, press
<RESET> while viewing the error
messages to clear all faults.
A.C.HOT SET METER RANGE
> 150 V.A.C.
A.C. NEUT
A+B = 117 VAC (± 10%)
EARTH A+C = Less than 1 VAC
GROUND B+C = 117 VAC (± 10%)
B
C