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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 LED | Localize 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
CREDIT AND MATCH FEATURE COUNTER LED MAN 74 A
Parts of the module
| Description | Quantity |
| LED MAN 74 A | 2 |
| Lamps 12 V miniature | 3 |
| Fuse 1K 1/4W 10% | 3 |
| " 4K7 1/4W 10% | 2 |
| Transistor 2N3794 | 5 |
| Condenser FACO MOA 0,22 uF 100V | 1 |
| Printed circuit ref. 510050 | 1 |
| Plastic plate credit and match feature IS- 149 | 1 |
| Plastic divider MG-16 | 4 |
| Screws 1/8 x 15 c/p F-156 | 4 |
| Nut 1/8 AD-2 | 4 |
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