manuals/manuals_Support_Center_Bulletins_PDF_csbull05

TSB5 6-26-95

Customer Service Bulletin

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6/26/95

merit industries, inc.

Problem:

Monitor failure;

R103 and R104 resistors can open.

Games affected:

Games equipped with Eygo monitors. To determine if your game
uses an Eygo monitor, look at the sticker on the neck board of the
monitor; Eygo monitors are represented as Type 2, Type 3, Type 4,
Type 5, Type 6 or Type 7.

Symptoms:

Monitor fails to come on after power up.

Cause:

Low power capacity of existing R103 and R104 resistors.

Solution:

Replace existing 75K ohm 1/2W resistors with 75K ohm 1W
resistors.

TOOLS:

Long screwdriver
Small wire cutters/small needle nose pliers
Soldering iron
Solder sucker (if available)

WARNING

SERVICE PERSON SHOULD BE WELL-EXPERIENCED IN

WORKING WITH CRTs AND THEIR ASSOCIATED HIGH-

VOLTAGE PARTS.

IF YOU ARE NOT WELL-EXPERIENCED, DO

NOT ATTEMPT TO SERVICE THIS MONITOR BY YOURSELF.

19” Upright Model

Refer to Figure 2 for component locations on the monitor board.

Power down the game and unplug the line cord from the power source.

Open the rear door, to access the monitor section of the cabinet.

Customer Service Bulletin

TSB5-062795

MAKE SURE, BEFORE DISCONNECTING THE RED HIGH-VOLTAGE WIRE

FROM THE MONITOR, TO DISCHARGE THE PICTURE
TUBE ANODE BY TOUCHING THE SCREWDRIVER (OR
SIMILAR METAL OBJECT) TO THE METAL CLIP

UNDER THE “RUBBER CUP” AND TO THE METAL CHASSIS. BE CAREFUL
NOT TO TOUCH THE PICTURE TUBE ANODE, OR THE METAL OF THE
SCREWDRIVER, WHILE GROUNDING THE ANODE. NEGLECTING TO
REMOVE THIS CHARGE CAN LEAD TO A SERIOUS SHOCK. Disconnect the
red high-voltage wire from the rear of the monitor, by gently pulling up on the
“rubber cup” (picture tube anode), and simultaneously touching the screwdriver
against the clip underneath and to the metal chassis (ground). See Figure 1.

Disconnect the monitor from its power source.

Remove the monitor control board from the neck of the picture tube by gently
pulling at it (and gently rocking it). BE CAREFUL NOT TO BREAK THE NECK
OF THE PICTURE TUBE.

Disconnect the black ground wire from the monitor control board. Cut any tie
wraps that may be holding the ground wire to other wires.

Disconnect the 18-pin header from the front edge of the board.

Disconnect the 6-pin connector that goes from the main header to the monitor
board.

Disconnect the 4-pin connector, in the middle of the board, attaching the
horizontal and vertical hold control wires.

Remove the screws holding the board in place and remove the board from the
cabinet.

Disconnect the 3-pin connector attached to J50.

10.

Disconnect the 2-pin connector, on the monitor side of the board, attaching the
two red wires from the degaussing coil to the board.

11.

Remove the existing resistors from R103 and R104, by heating the soldered
area on each side of the resistor and gently pulling the resistor from the board.
Remove the excess solder with a solder sucker if one is available.

12.

Carefully solder the new resistors into place. BE SURE NOT TO GET SOLDER
ON ANY OTHER PIN POSITIONS AS YOU CAN CAUSE A SHORT.

TSB5 6-26-95

Customer Service Bulletin

13.

Reattach the 2-pin connector from the degaussing coil and the J50 connector
first, as they are much harder to connect once you’ve put the board back in the
cabinet.

14.

Install the board back in the cabinet.

15.

Discharge the picture tube anode again before reattaching the red high-voltage
wire.

16.

Reattach the high-voltage wire by putting one half of the clip in the hole and
using the screwdriver to push in the other half.

17.

Reattach the remaining wires to the board. Be sure to reconnect the 4-pin
connector to the “A” connector on the board.

18.

BE VERY CAREFUL WHEN REATTACHING THE MONITOR CONTROL
BOARD, SO AS NOT TO BREAK THE NECK OF THE PICTURE TUBE. Align
the notch on the board with the end of the neck and press GENTLY, but firmly
until the board is in place. Reconnect the 8-pin connector to the monitor control
board.

19.

Close the rear door, plug in the line cord and power up the game.

13” Cabaret Model

Refer to Figure 2 for component locations on the monitor board.

Power down the game and unplug the line cord from the power source.

Open the rear door, to access the monitor section of the cabinet.

MAKE SURE, BEFORE DISCONNECTING THE RED HIGH-VOLTAGE WIRE

FROM THE MONITOR, TO DISCHARGE THE PICTURE
TUBE ANODE BY TOUCHING THE SCREWDRIVER (OR
SIMILAR METAL OBJECT) TO THE METAL CLIP

Disconnect the monitor from its power source.

Customer Service Bulletin

TSB5-062795

Remove the monitor control board from the neck of the picture tube by gently
pulling at it (and gently rocking it). BE CAREFUL NOT TO BREAK THE NECK
OF THE PICTURE TUBE.

Disconnect the black ground wire from the monitor control board. Cut any tie
wraps that may be holding the ground wire to other wires.

Disconnect the 18-pin header from the front edge of the board.

Disconnect the 6-pin connector that goes from the main header to the monitor
board.

Disconnect the 4-pin connector, in the middle of the board, attaching the
horizontal and vertical hold control wires.

Remove the screws holding the monitor assembly to the monitor shelf and
remove the whole assembly. (Some models of 13” cabaret will allow you to
access all the screws securing the monitor board, without removing the monitor
assembly. If you can remove the board without removing the monitor assembly,
skip this step and Step 11. If ou are unsure, it is safest to remove the monitor
assembly.)

Remove the screws holding the picture tube to the chassis and remove the
tube.

10.

Remove the screws holding the board in place and remove the board from the
cabinet.

11.

Disconnect the 3-pin connector attached to J50.

12.

Disconnect the 2-pin connector, on the monitor side of the board, attaching the
two red wires from the degaussing coil to the board.

13.

14.

Carefully solder the new resistors into place. BE SURE NOT TO GET SOLDER
ON ANY OTHER PIN POSITIONS AS YOU CAN CAUSE A SHORT.

15.

Reattach the 2-pin connector from the degaussing coil and the J50 connector
first.

16.

Install the board back in the chassis.

TSB5 6-26-95

Customer Service Bulletin

17.

Discharge the picture tube anode again before reattaching the red high-voltage
wire.

18.

Reattach the high-voltage wire by putting one half of the clip in the hole and
using the screwdriver to push in the other half.

19.

Reattach the remaining wires to the board. Be sure to reconnect the 4-pin
connector to the “A” connector on the board.

20.

Reinstall the monitor chassis into the cabinet.

21.

22.

Reconnect the monitor to its power source.

23.

Close the rear door, plug in the line cord and power up the game.

Countertop Model

Refer to Figures 3 and 4 for chassis disassembly information and Figure 2 for component locations on
the monitor board.

Power down the game and unplug the line cord from the power source.

Open the rear door to gain access to the monitor section. To change the
resistors, you will have to remove the lid and then remove the monitor chassis.

To remove the lid, unscrew the thumbscrews on each side of the chassis, push
the lid forward, and pull up. You may have to disconnect the ground braid that
runs from the power entry to the lid.

Remove the metal plate across the rear of the CPU section. Note the location of
any ground straps attached to the back plate for later replacement.

Disconnect the monitor from its power source.

Disconnect the touchscreen cable from the board.

Disconnect the ground wire running from the touchscreen cable to the power
supply.

Disconnect the 6-pin connector that goes from the main header to the monitor
board.

Customer Service Bulletin

TSB5-062795

Take the monitor controls off the Velcro strip so they can be removed with the
monitor.

10.

Remove the six nuts (three on each side, at the bottom) securing the monitor
chassis to the main chassis.

11.

Unscrew the nut on the top of the monitor chassis which secures the hook
holding the monitor flyback.

12.

Remove the monitor chassis and lay it on the flat surface on the back of the
monitor board.

MAKE SURE, BEFORE DISCONNECTING THE RED HIGH-VOLTAGE WIRE

FROM THE MONITOR, TO DISCHARGE THE PICTURE
TUBE ANODE BY TOUCHING THE SCREWDRIVER (OR
SIMILAR METAL OBJECT) TO THE METAL CLIP

Remove the monitor control board from the neck of the picture tube by gently
pulling at it (and gently rocking it). BE CAREFUL NOT TO BREAK THE NECK
OF THE PICTURE TUBE.

Disconnect the black ground wire from the monitor control board.

Disconnect the 4-pin connector, in the middle of the board, attaching the
horizontal and vertical hold control wires.

Remove the screws holding the board in place and remove it from the monitor
chassis. Disconnect the 2-pin connector, on the monitor side of the board,
attaching the two red wires, from the degaussing coil, to the board.

Remove the existing resistors from R103 and R104 by heating the soldered
area on each side of the resistor and gently pulling the resistor from the board.
Remove the excess solder with a solder sucker if one is available.

Carefully solder the new resistors into place. BE SURE NOT TO GET SOLDER
ON ANY OTHER PIN POSITIONS AS YOU CAN CAUSE A SHORT.

TSB5 6-26-95

Customer Service Bulletin

Discharge the picture tube anode, again, before replacing the red high-voltage
wire.

Reattach the 2-pin connector from the degaussing coil.

10.

Re-secure the board chassis to the monitor chassis.

11.

Reattach the high-voltage wire by putting one half of the clip in the hole and
gently using the screwdriver to push in the other half.

12.

Reattach the remaining wires to the board. Be sure to reconnect the 4-pin
connector to the “B” connector on the board.

13.

BE VERY CAREFUL WHEN REATTACHING THE MONITOR CONTROL
BOARD TO THE PICTURE TUBE, TO MUCH FORCE WILL BREAK THE
NECK OF THE TUBE. Align the notch on the board with the end of the neck
and press

GENTLY, but firmly, until the board is in place.

14.

Carefully put the monitor chassis back into the main chassis and secure it in
place. Reattach the hook, holding the monitor flyback in place.

15.

Replace the back plate across the CPU section and resecure any ground
straps.

16.

Put the lid back on and secure the thumbscrews.

17.

Close the rear door, plug in the line cord and power up the game.

Customer Service Bulletin

TSB5-062795

“Rubber cup”
covering the picture
tube anode

Touch the clip under the

“rubber cup” and then touch

the metal chassis to remove

any remaining charge. Be

prepared for a spark and a

“snapping” sound.

Be careful not to touch the

metal of the screwdriver

while performing this

operation

Picture tube
anode (inside
the hole, under
the rubber cup)

Figure 1 - Discharging the Picture Tube Anode