Rowe BC-1200, Руководство по обслуживанию на поле и каталог запасных частей

Страница: 134 / 217

Section 4: Troubleshooting
25238802 4-63
OUT OF SERVICE LAMP
The
OUT OF SERVICE
lamp is controlled by the sw12 VDC supply through U7G Pins 7 and 10. Whenever
the sw12 VDC supply is
ON
, the power control relay is energized and the
OUT OF SERVICE
lamp is
OFF
.
Whenever the switched 12 VDC supply is turned
OFF
, the power control relay de-energizes and the
OUT OF
SERVICE
lamp will be lit.
STACKER DRIVE
The stacker drive signal though U12D and U14E is applied to the stacker control board in the stacker. The stacker
drive signal is a 200 ms pulse, just long enough to start the stacker motor and move it off its
HOME
switch.
DOLLAR COUNTER
The dollar counter is controlled by signals sent through U6D and U7F. A
HIGH
on U6D Pin 9 turns the counter
ON
while a
LOW
on U6D Pin 9 turns the counter
OFF
. The counter is pulsed 50 ms
ON
, 50 ms
OFF
when counting.
BUCKET DRIVE
All three bucket drive circuits operate in the same manner, so only the left bucket drive circuit will be discussed.
When the bucket circuit is
OFF
, U11D Pin 4 is
LOW
, U11D Pin 13 is open, so R106 keeps Q12
OFF
. With Q12
OFF
, R106 keeps Q8
OFF
. When U11D Pin 4 goes
HIGH
, U11D Pin 13 goes
LOW
, turning
ON
Q12. Q12 supples
base current to Q8, turning it
ON
, which turns
ON
the bucket coil.
STACKER SOLENOID
When the stacker solenoid is
OFF
, U6F Pin 13 is
LOW
, Pin 12 will also be
LOW
, keeping Q4
OFF
. When U6F Pin
13 goes
HIGH
, Pin 12 will open, allowing base current to Q4 through R83, turning Q4
ON
, which turns
ON
the stacker
solenoid in the stacker. The solenoid controls the flipper which determines whether the bill gets stacked in the upper
or lower box.
COIN LOCKOUT
The coin lockout is controlled by signals sent through U6A and U7E. A
HIGH
on U6A Pin 1 turns the coin lockout
ON
, while a
LOW
on U6A Pin 1 turns the coin lockout
OFF
. When the coin lockout is
ON
, coins may pass through
the coin acceptor to the coins switches.
Sheet 4: Input Circuits
Most of the input circuits are straightforward. A series resistor, usually 100 ohms or 1 K-ohms, and either a .01
or .1 microfarad capacitor to ground provide a little noise filtering. Several inputs have pull up resistors.
Seven inputs from P4 are connected to A/D conversion inputs on the processor. All the other inputs are digital signals.
The circuits involving U17A, U17B, Q14, and Q16 convert analog inputs to digital signals.