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Credit and match module

Sympton Cause Procedure
A) The 00 of the match feature or the 1 of the credits do not turn on. a) Blown bulbs Checking with the test point on the collector of transistor 2N3794, TL has to turn on. If it does not turn on replace bulb.
b) There is no command impulse Checking with the test point on the transistor base TL has to turn on. If it does not turn on, see failure in MPU.
c) Open transistor Checking with the test point, there will be a command impulse at the base and TL will be lighted. In the collector TL will be lighted too. Replace transistor.
B) The 00 of the match feature or the 1 of credits play is always on. a) Closed transistor Checking with the test point and with the machine on TL will not turn on at the base and neither at the collector. Replace transistor.
C) The LED, which shows the credits and the match feature never turn on.a) If the LED is the match feature one. Check in the MPU module that the switch is not in Extra Ball position. switch the ball in extra ball position
D) The LEDs that show the credits and the match feature are always on and show the same number. a) Closed match feature LED transistor Checking with a voltimeter at the base of the transistor (before the resistor), there will be 2VDC. If there is a different voltage, see failure in MPU. If not replace transistor.
E) One of the LEDs does not count correctly and appear strange numbers. a) Defective LEDLocalize which is the segment that fails. Check if on the corresponding module input TL turns on. If this happens, replace LED.
b) The command impulse does not arrive.If at the module input, TL does not turn on, see failure in MPU module.

COMPONENTS USED IN THE CREDIT AND MATCH FEATURE

TRANSISTOR 2N3794 transistortransistor CREDIT AND MATCH FEATURE COUNTER LED MAN 74 A ledled

Parts of the module

DescriptionQuantity
LED MAN 74 A2
Lamps 12 V miniature3
Fuse 1K 1/4W 10%3
" 4K7 1/4W 10%2
Transistor 2N37945
Condenser FACO MOA 0,22 uF 100V1
Printed circuit ref. 5100501
Plastic plate credit and match feature IS- 1491
Plastic divider MG-164
Screws 1/8 x 15 c/p F-1564
Nut 1/8 AD-24
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