Snack - Based Troubleshooting and Repair Guide
September, 2002 Page 5 of 54 1670065
5. Main Circuit Breaker
a. The main circuit breaker is placed in line just after the main switch. The main circuit
breaker is designed to protect the merchandiser from over-current conditions that may
be produced at the wall outlet in the electrical circuitry of the location. These conditions
could cause erratic operation of the merchandiser, damage internal components and even
electrical shock and personal injury.
WARNING:
The over-current protection provided by the main circuit breaker must never be
compromised. Shorting or jumping across this breaker WILL compromise this
protection and cause, potentially, severe problems. (SEE ABOVE PARAGRAPH)
6. EMI Filter
a. The EMI, or line load filter is rated at 5 amp, 115/250-volt ac, 50/60Hz. The internal
components consist of two 850 uH (micro Henry) inductors, a.01 uF (MicroFarad)
capacitor and two 2800 pF (Pico Farad) capacitors. The purpose of the filter is to filter
“noise” that may be riding the ac signal. This unstable, tag along voltage riding the ac
signal could adversely effect the operation of the electronic components within the mer-
chandiser and cause erratic operation of those electronics i.e. main controller, Interface
Board etc. Failure of any of the internal components within the filter could prevent
proper power distribution within the merchandiser. Light failure, improper board opera-
tion, or tripping of main breaker could be attributed to internal component damage in the
EMI Filter.
7. Transformer
a. The transformer is a double primary winding, 120-volt ac step-down that provides 24-
volt ac to the main controller board for distribution to other low voltage components
within the merchandiser. The voltage is filtered, rectified and dropped to accommodate
the various circuits respectively. (See Main Controller and Interface Board).
8. Electronic Circuit Breaker
a. A 3 amp rated electronic circuit breaker completes the power circuit. It is designed to
provide protection from over current conditions that may potentially damage low volt-
age electronics. Circuit boards and other low voltage component are vulnerable to high
current and a three amp rating is the limit with which to prevent board damage, fire and/
or electrical shock.
WARNING:
The over-current protection provided by the electronic circuit breaker must never
be compromised. Shorting or jumping across this breaker WILL compromise this
protection and cause, potentially, severe problems.
B. Coin Power Board(Optional)
1. The coin power board, though considered part of the power circuit, is also part of the mone-
tary circuit. The coin power board uses a full wave rectifier which takes 120 volts ac and
converts it to 120 volts dc for coin mechanism use.
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