Classic Mode

Star Tech Journal

Issue: 1997-June - Vol 19 Issue 4

June 1997
STAR* TECH JOURNAL
MARS INTELLITRAc Co1N CHANGER T'SHOOTING Gu10E
Mars Electronics
West Chester, Pennsylvania
To properly troubleshoot and re-
pair the IntelliTrac Series of coin
changers, it is imperative to have
a solid understanding of the se-
quential operation of the changer.
FAILURE CATEGORIES
All failures can be grouped into six
categories:
1. Power Failures
2.
3.
4.
5.
6.
Acceptance Failures
Dispense Failures
Coin Routing Failures
Credit Failures
Peripheral Failures
1. POWER FAILURES
]
Changer is ''Dead"
All coins are rejected. A loss of
+5V will disable all of the digital
circuitry, including the micropro-
cessor. No coin recognition, gate,
dispense or peripheral operations
can be accomplished.
AREAS To INVESTIGATE
Models TRC-6000/TRC-6010
• +5V Supply from the vending
machine controller
• Defective logic component
loading
A loss of full-wave rectified l I0V
(TRC-6000), full-wave rectified
24 V (TRC-6010) or the regulated
l IOV (TRC-6800) will disable all
solenoid drive functions (First
Gate, Second Gate, Dispensers,
Vend Relay, Exact Change Light
and Cash Meter). The coin rec-
ognition, coin tube sensor and
microprocessor circuitry should
operate properly.
AREAs To INVESTIGATE
Models TRC-6000/TRC-6010
• Full-wave rectified ll0V or 24V
from the vending machine con-
troller
• All solenoid drive circuits
NOTE: It is advisable to check
the resistance between pins 10
and 12 of the Main Cable Assem-
bly for a short prior to applying
power to the unit.
Model TRC-6800
• l lOVac from vending machine
• + l IOV Power Supply circuit
• All solenoid drive circuits
NOTE: It is advisable to check
the resistance between pins I and
2 of the Main Cable Assembly
for a short prior to applying
power to the unit.
+5V Output
Model TRC-6800
A failure of the +BV supply.
• l lOVac Supply from the vend-
ing machine
• +SV Power Supply circuit
• Defective logic component
loading +SV output
This will disable the HFI, HF2,
and Strobe oscillators. No coins
will be sensed by the HFI coils
and the transaction will never be
started.
AREAs To INVESTIGATE
Models TRC-6000/TRC-6010
+SV Supply from the vending
machine controller "Charge
Pump" circuit HFI, HF2, and
Strobe oscillator circuits
Model TRC-6800
• ll0VAC from the vendor
• +8V Power Supply circuit
• HFI, HF2, and Strobe oscilla-
tor circuits
(
2. AccEPrANCE FAILURES
J
All or some coins are rejected.
When a valid coin meets all the
criteria for acceptance the First
Gate will be enabled. These cri-
teria include the presence of a
Blocker or Accept Enable Signal,
the proper Option Switch set-
tings, an adequate change in-
ventory ( dependent on the Op-
tion Switch settings), HFI and
HF2 oscillator output values
within predetermined, statisti-
cally sound windows, established
through the teach and massage
operations, proper microproces-
sor program execution and the
proper operation of the First
Gate circuit. Poor acceptance
may be corrected by dropping a
large number of coins of the ap-
propriate denomination. This
massaging technique will statisti-
cally adjust the acceptance win-
dows for improved acceptance.
June 1997
AREAs To INVESTIGATE
Models TRC-6000 /TRC-6010
AREAs To INVESTIGATE
All models
• Accept Enable signal from
vending machine controller
• HF2 oscillator circuit
• Central Processing Block
• Dispenser circuits
Model TRC-6800
• Blocker signal
CHANGE MAKING
All models
• option Switches
• Coin Tube Sensor circuits
• HFl and HF2 oscillator circuits
• First Gate circuit
• Central Processing circuit
• Reset circuitry
[
3. DISPENSE F AIWRES
]
Incorrect, or no change or Escrow
Return.
The dispensers are enabled dur-
ing three operations:
1. Escrow Return Request
2. Change Making
3. Manual Dispense Request
ESCROW RETURN REQUEST
The changer's microprocessor
periodically enables the HF2 os-
cillator to detect an Escrow Re-
turn Request. If, during this time
frame the HF2 oscillator output
frequency should decrease, the
microprocessor will enable the
appropriate dispensers to pay-
back all credit accumulated dur-
ing the current transaction.
Be aware that the option Switches
of the TRC- 6800 or the exter-
nal vending machine controller
of the TRC-6000 or TRC-6010
may disable the Escrow Return
function, entirely.
n most cases, when a vend is
complete, the vending machine
controller will enable the dis-
pensers to payback accumulated
credit above the vend price in the
fewest coins available. In certain
modes, the dispensers may be
enabled even though no change
is available.
AREAs To INVESTIGATE
All models
• Central Processing Block
• Dispenser circuits
MANUAL DISPENSE REQUEST
A dispenser will be enabled
when a Manual Dispense Switch
is closed on the changer, vend-
ing machine controller or vendor.
Proper operation in this mode
will verify proper Dispenser cir-
cuit operation.
The status of the Coin Tube Sen-
sors and the High 25c / Low 25c
Option Switch determine coin
routing. A coin will be routed to
the cash box when the Upper
Coin Tube Sensor for that par-
ticular coin, or in the case of the
Quarter, the Lower Coin Tube
Sensor if the Low 25c Option is
selected, is covered. In this sce-
nario the Second Gate solenoid
is not enabled, the gate remains
open and the coin goes to the
cash box.
If the conditions noted above do
not exist, the Second Gate sole-
noid will be enabled, blocking
the path to the cash box and rout-
ing the coin to the appropriate
Coin Tube. US and Canadian
Dollar coins will always go to the
cash box.
AREAs To INVESTIGATE
All models
• Central Processing Block
• Coin Tube Sensor circuit
• Second Gate circuit.
No or Incorrect Credit.
AREAs To INVESTIGATE
All models
• Central Processing Block
• Dispenser circuits
( 4. Co1N ROUTING FAIWRES )
Coins that have gone to the cash box
instead of a Coin Tube or coins that
go to Coin Tube instead of cash box.
Once a coin is through the First
Gate it will encounter the Strobe
coil. A change in the frequency
of the Strobe oscillator output will
trigger the microprocessor into
applying appropriate credit to the
accumulator, based on the coin's
validated identity.
AREAs To INVESTIGATE
Model TRC-6800
• Central Processing Block
Coins which are rejected do not
fit this category. Coin routing is
determined by the microproces-
sor during the recognition cycles
All models
• Strobe oscillator
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