Table 31 Troubleshooting Table

Problem

Suggested Action

Coin Mechanism Problems

Gaine Play Problems

When you first start a character in the middle of a clear space, he does not stand still. When a character walks forward, he jerks, and looks as though he was trying to run backwards.

A character does not move up and down.

A character does not move back and forth.

A screen character does not move or moves intermittently.

Joystick Problems

The handle does not immediately return to center.

Joystick handle sticks.

Sound Problems

1. Check the wiring to the coin mechanism.

2. Check the voltage to the + side of the mechanism.

3. Test the coin mechanisms with the sound test screen in the self-test.

1. Check the harness and connectors.

2. Perform the self-test.

3. Check the voltage levels on the PCBs. See Table 3-2, Voltage Inputs and Test Points.

4. Check What ROM Problems Look Like, Table 3-3, for specific ROM problems.

Calibrate and center the joystick.

Calibrate and center the joystick.

Calibrate and center the joystick. Calibrate and center the joystick.

1. Check the connections.

2. Check if the Hall-effect sensors are bent.

3. Check if the Hall-effect sensors are close enough to the magnets. Be careful not to bend the sensors if you move them.

1. Has the joystick been lubricated with white lithium grease? If not, lubricate.

2. Check the harness and connectors.

3. Calibrate and center the joystick.

4. If you took the joystick apart, have you reassembled it.correctly?

5. Make sure all the parts on the joystick are in good repair. Repair or replace parts.

6. Check the Hall-effect sensors on the joystick PCB. Make sure they are not bent.

7. Replace the joystick PCB.

1. Make sure the actuator is installed with the long end through the slides.

2. Lubricate the joystick assembly.

1. The screws holding the joystick assembly together may be too tight.

2. Lubricate the joystick assembly.

1. Is the speaker volume turned up?

2. Check the voltage on the JAMMA connector.

continued on page 3-2

Table 3-1 Troubleshooting Table, Continued

Problem

Suggested Action

Sound Problems, Continued

3.

Check the wiring from the audio PCB to the speaker.

4.

Check the audio ROM and RAM in the self-test on the Sound Test screen. See

Table 2-4, Bad Sound RAM and ROM Locations.

5.

Check the voltage level to the audio PCB. See Table 3-2, Voltage Inputs and Test

Points.

6.

Replace the speaker.

Video Display Problems

Sync Problems

Does your display need separate positive sync? See the Video Display Sync Problems

section in this chapter.

Screen is Dark

1.

Is the game plugged in?

2.

Is the game turned on?

3.

Are the connections good?

4.

Is the line fuse good?

5.

Is the display brightness turned up?

6.

Are the solder connections on the line filter and transformer good?

7.

Is the JAMMA connector on the PCB tightly?

8.

Check all of the items below. If you answer no to any question, you have a prob

lem with the video display, not with the game circuitry. See your video display ser

vice manual.

a. Do you have power to the video display?

b. Are the video display's filaments lit?

c. Do you have high voltage to the video display?

9.

Is the voltage level to the video display PCB correct? (Power volusge is 100 VAC or

110 VAC, depending on the type of video display. Video signal voltage is 0.5 to 3.5

Volts.)

10

If the level is not correct, check the connectors and the harness.

11. Check the +12 V and the +10 V circuits on the game PCB.

Display area wavers or is too

1.

Do you have voltage to the video display PCB?

small.

2.

Do you have high voltage to the video display?

Picture is wavy.

1.

Is the monitor ground connected to the monitor?

2.

Are the sync inputs connected properly? Does your monitor need a separate posi

tive sync? See the Video Display Sync Problems section in this chapter.

Picture is upside down.

Switch the horizontal or vertical yoke wires on the display.

Convergence, purity

Use the screens in the self-test to adjust the video display.

or color problems

Game is stuck in

Make sure both self-test switches are switched off. If one or both are switched on, then

self-test

the

game will be in self-test.

Table 3-2 Voltage Inputs and Test Points on the PCBs

PCB

Voltage

Test Point or LED

Source and Purpose

¡Main

+5 ± 0.25 VDC

VCCI

Logic power from the switching power supply.

Main

+10 ± 0.5 VDC

+10V or the case of the LM317

Regulated and comes from the +12 V from the audio PCB. Drives the video circuitry.

Main

CR1 LED

Lights when 5 V is applied to the main PCB and the reset (RST) jumper is open.

Audio

CR6 LED

Lights when the +14 V supply is good.

Audio

CR3 LED

Lights when the -14 V supply is good.

Audio

CR13 LED

Lights when the +5 V supply is good.

Audio

CR 12 LED

Lights when the +12 V supply is good (but only if the audio PCB has a 12 V regulator at Q3 on it).

(pin 4 of any TL084)

From +14 V. Positive supply for the analog circuitry.

(pin 11 of any TL084)

From the -5 V regulator. Negative supply for the analog circuitry.

Table 3-3 What ROM Problems Look Like

Problem

ROM Causing the Problem

Check the ROM at:

Program works but letters and numbers appear; wrong.;

Alphanumeric

125D

Program works and the playfield looks OK, but the motion objects are wrong.

Motion object

: 70Uy 43U, 70S. 43S, 64U. 38U. 64S, 38S, ;; i-57U. 32U, 57S, 37S; V

Program works, motion objects look OK, but the playfield is wrong.

Playfield

760, 47U, 76S,. 475.;

Garbage on screen; program doesn't work.

Video processor

45J

Program ROM 0

40A, 50A

Screen is blank even though the power is turned on.

Extra processor

2QP

Program EPROM 0

101 i, K!S

Game program is erratic.

Video program ROM 1, 2, 3

40B, 50B, 40D, 50D, 40E, 50F.

Common ROM

•iOK. 50K

No sound or erratic sound.

Audio ROM

2H on the audio PCB

Video Display Sync Problems

Some video displays cannot use the composite negative sync that is on the JAMMA connector. The Escape kit includes a standard Atari video connector (located at 15K) that provides separate positive sync. Refer to Table 3-4 and make the appropriate connections for your video display.

For other problems, see the video display manual that came with your game.

Joystick Procedures

The Hall-effect joystick provides your game with precise movement and speed control of the player's character. For best performance, lubricate and check the centering of the joystick regularly.

0 0

Post a comment