Mephisto

Note: This page is a work in progress. Please help get it to a completed state by adding any useful information to it.

1 Introduction

This pinball machine was manufactured in 1987 by a Spanish company, Universal de Desarrollos Electronics, S.A. Their various trade names were Unidesa/Cirsa/Stargame.

It is horror-themed and has both 2 and 3-ball multiball.

The boardset is unique and the playfield parts are as well.

The manual for the game is in Spanish. The available scans of the manual available on the internet (see the manual on IPDB) are not good quality and there are some mistakes (to be pointed out below).

2 Technical Info

There are 4 major boards used in this game:

• Power Feed Board (Carta Alimentacion)
• Solenoid Driver Board (Carta Potencia)
• CPU Board (Carta Control)
• Sound Board (Carta Sonido)

The game used LED displays and there are 4 displays for the players and a credit/match display. As a result, there is not high voltage generation in the machine.

The basic architecture of the game's electronics is:

• The Transformer sends various A/C voltages to the Power Feed Board
• The Power Feed Board turns most of these A/C voltages to D/C voltages through the use of 4 bridge rectifiers and sends those voltages to other boards in the game. Also the Power Feed Board holds most of the fuses on the game (the only exception being the main fuse, which is located in the bottom of the cabinet, next to the transformer).
• The Solenoid Driver Board is responsible for driving the solenoids (actually coils and flashers) in the game.
• The CPU Board runs the game code and is responsible for driving the displays, the feature lamps, and handling switches
• The Sound Board generates sound and speech

More t.b.s.

2.1 Power Feed Board

More t.b.s.

2.2 Solenoid Driver Board

t.b.s.

2.3 CPU Board

t.b.s.

2.4 Sound Board

t.b.s.

2.5 Flasher Lamps

This game uses two types of flasher lamps:

• 12V 15W (9x)
• 12V 3W (2x)

Lamps with these specs are difficult to find, especially the 12V 15W. The original 12V 15W lamps had a large bayonet base (BA15s) and smaller glass bulb shape (G-6). Today, the only available 12V 15W replacement with a BA15s base is a #7533 bulb, which a longer (2.0") and wider (1.04") glass bulb with S-8 glass bulb shape. In comparison, the original lamps with a G-6 glass bulb shape were 1.44" long and 0.75" wide. The #7533 is not very common, but is still manufactured by CEC Industries. Use of this bulb requires some rework of the mounts for the bulbs to add spacers and longer screws, and in some cases (i.e. the eyes behind the backglass), cutting the plastic tubes that surround the bulbs to focus the light and replacing them with larger tubes. A downside to using #7533 bulbs is the average life hours is short, namely 75 hours.

Another option is to change the resistors used to drop the voltage for the flashers, so that more commonly available lamps with the smaller G-6 glass bulb shape could be used. Each set of flashers uses a resistor board (sometimes 1 board is used for a single flasher, sometimes multiple flashers share a board) to drop the voltage used by the flashers. In theory, you could determine a different mix of resistors to use to get the desired voltage for the flasher lamps you want to use. If anyone has any experience doing this, please share the details in this forum...

More details are t.b.s.

3 Charts

3.1 Fuse Chart

Fuse	Type	Usage	Location
F1	7A SB	GI	Power Feed Board
F2	7A SB	GI	Power Feed Board
F3	5A SB	Flippers	Power Feed Board
F4	4A SB	Solenoids	Power Feed Board
F5	2A SB	Audio	Power Feed Board
F6	7A SB	Feature Lamps	Power Feed Board
F7	7A SB	A/C Leg 1 to PR4 (used to generate 12VDC/5VDC)	Power Feed Board
F8	7A SB	A/C Leg 2 to PR4 (used to generate 12VDC/5VDC)	Power Feed Board
X	2A SB	Main	Cabinet

3.2 Lamp Chart

Feature Lamp Map

Lamp	Description
1	Top Lane (center)
2	Top Lane (right)
3	30K When Lit
4	Not used
5	Not used
6	Not used
7	Multiball Arrow 1 (top)
8	Multiball Arrow 2
9	Multiball Arrow 3
10	Multiball Arrow 4
11	Pop Bumper (top)
12	Pop Bumper (bottom)
13	Pop Bumper (right)
14	Ramp Arrow (right)
15	Left Ramp Arrow 1 (top)
16	Left Ramp Arrow 2 (middle)
17	Left Ramp Arrow 3 (bottom)
18	Drop Target Bonus (top)
19	Drop Target Bonus (middle)
20	Bonus (10K)
21	Bonus (9K)
22	Bonus (8K)
23	Bonus (7K)
24	Bonus (6K)
25	Bonus (5K)
26	Bonus (4K)
27	Bonus (3K)
28	Bonus (2K)
29	Bonus (1K)
30	Standup Target (top)
31	Standup Target (middle)
32	Standup Target (bottom)
33	Left Inlane
34	Not used
35	Right Inlane
36	Right Outlane/Gate
37	X5
38	X4
39	X3
40	Left Special
41	Right Special
42	Shoot Again
43	Shooter Lane (1K pts)
44	Shooter Lane (15K pts)
45	Shooter Lane (30K pts)
46	Backglass (Game Over)
47	X2
48	Bonus (30K)
49	Bonus (20K)
50	Multiball Arrow 5
51	Backglass (High Score)
52	Extra Ball
53	Drop Target Bonus (bottom)
54	Multiball Arrow 6 (bottom)
55	Top Lane (left)
56	Backglass "O"
57	Backglass "T"
58	Backglass "S"
59	Backglass "I"
60	Backglass "H"
61	Backglass "P"
62	Backglass "E"
63	Backglass "M"

	Col 0 J3.2-10 Brn-Red TR9	Col 1 J3.2-9 Grn-Red TR10	Col 2 J3.2-8 Brn-Yel TR11	Col 3 J3.2-1 Vio-Red TR12	Col 4 J3.2-3 Brn-Grn TR13	Col 5 J3.2-2 Orn-Yel TR14	Col 6 J3.2-4 Vio-Grn TR15	Col J3.2-6 Yel-Blk TR16
Row 0 J3.1-1 Red-Brn TR1	42	1	48	52	46	51	4	5
Row 1 J3.1-2 Red-Yel TR2	54	2	49	3	7	0	36	6
Row 2 J3.1-4 Red-Blk TR3	50	25	20	15	8	14	35	34
Row 3 J3.1-6 Red-Gry TR4	10	26	21	16	30	37	53	40
Row 4 J3.1-5 Red-Vio TR5	9	27	22	17	31	38	19	41
Row 5 J3.1-8 Red-Blu TR6	43	28	23	44	32	39	18	45
Row 6 J3.1-9 Yel-Vio TR7	11	29	24	12	33	47	13	55
Row 7 J3.1-10 Red-Grn TR8	56	57	58	59	60	61	62	63

3.3 Solenoids

Solenoid Map

Sol. No	Solenoid description	Connector	Wire Color	Coil/Flasher
1	not used
2	Top Pop Bumper	J11-3	Yel-Vio	Coil 1000/45
3	Right Pop Bumper	J11-2	Yel-Vio	Coil 1000/45
4	Bottom Pop Bumper	J11-5	Yel-Vio	Coil 1000/45
5	not used
6	not used
7	not used
8	Left Eject Hole	J12-7	Wht-Gry	Coil 1300/26
9	Center Eject Hole	J12-6	Red-Grn	Coil 1300/26
10	Diverter Release	J12-3	Yel-Blk	Coil 1400/20
11	Ramp Diverter	J12-2	Brn-Vio	Coil 1300/26
12	3-bank Drop Target Reset	J12-4	Brn-Yel	Coil 1450/50
13	Single Drop Target Reset	J12-5	Grn-Blk	Coil 1200/40
14	Trough Eject	J12-10	Red-Blk	Coil 1300/26
15	Right Eject Hole	J12-9	Brn-Grn	Coil 1300/26
16	Flasher (skull)	J13-8	Brn-Red	Flasher 12v 3w (2x)
17	Flasher (top left)	J13-6	Red-Yel	Flasher 12v 15w (1x)
18	Flasher (eyes on BG)	J13-3	Vio-Blu	Flasher 12v 15w (2x)
19	Flasher (bat)	J13-2	Red-Blu	Flasher 12v 15w (3x)
20	Flasher (sun on BG)	J13-4	Grn-Red	Flasher 12v 15w (2x)
21	Flasher (top right)	J13-5	Wht-Blu	Flasher 12v 15w (1x)
22	Knocker	J13-10	Wht-Grn	Coil 1000/35
23	Gate	J13-9	Yel-Red	Coil 4000/16

3.4 Switch Matrix

Switch Map

	Col 0 J4.1-10 Wht IC30	Col 1 J4.1-9 Wht-Yel IC30	Col 2 J4.1-8 Wht-Blk IC30	Col 3 J4.1-7 Wht-Gry IC30	Col 4 J4.1-6 Wht-Vio IC30	Col 5 J4.1-5 Wht-Blu IC30	Col 6 J4.1-4 Wht-Red IC30
Row 0 J4.2-6 Grn-Brn IC31	05	11	17	23	29	35	41
Row 1 J4.2-5 Grn-Yel IC31	04	10	16	22	28	34	40
Row 2 J4.2-4 Grn-Blk IC31	03	09	15	21	27	33	39
Row 3 J4.2-3 Grn-Gry IC31	02	08	14	20	26	32	38
Row 4 J4.2-2 Grn-Vio IC31	01	07	13	19	25	31	37
Row 5 J4.2-1 Grn-Blu IC31	00	06	12	18	24	30	36

3.5 Connection Charts

The following charts show the connections on each of the boards.

3.5.1 Power Feed Board

Conn-Pin	Purpose	Wire Color	To/From
J25-1
J25-2	GND 9.3VAC	Wht	From Transformer
J25-3	9.3VAC	Wht-Blk	From Transformer
J25-4
J25-5
J25-6	9.3VAC	Wht-Blk	From Transformer
J25-7
J25-8	16VAC	Grn-Wht	From Transformer
J25-9
J25-10	GND 16VAC	Yel-Red	From Transformer
J26-1	16VAC (audio)	Wht-Vio	From Transformer
J26-2	GND 16VAC (audio)	Gry	From Transformer
J26-3	Earth GND	Yel-Grn	From Transformer
J26-4	GND 50VAC (coils)	Blk-Wht	From Transformer
J26-5
J26-6	50VAC	Red	From Transformer
J26-7
J26-8	KEY
J26-9	50VAC (flippers)	Yel	From Transformer
J26-10
J27-1	GND 50VAC (flippers)	Yel-Brn	From Transformer
J27-2
J27-3
J27-4
J27-5	GND 6.3VAC	Brn-Grn	From Transformer
J27-6	GND 6.3VAC	Brn-Grn	From Transformer
J27-7	KEY
J27-8
J27-9	GND 6.3VAC	Gry-Blk	From Transformer
J27-10	GND 6.3VAC	Gry-Blk	From Transformer
J28-1	16V	Wht-Blk	To 33,000uF/40V Cap
J28-2	GND 16V	Brn-Grn	To 33,000uF/40V Cap
J29-1	V GI	Gry-Blk	To GI via F1-1
J29-2	V GI	Gry-Blk	To GI via F1-2
J29-3	V GI	Gry-Blk	To GI via B1-5
J29-4	V GI	Gry-Blk	To GI via B1-6
J29-5	GND GI	Brn-Grn	To GI via F1-3
J29-6	GND GI	Brn-Grn	To GI via F1-4
J29-7	GND GI	Brn-Grn	To GI via B1-7
J29-8	GND GI	Brn-Grn	To GI via B1-8
J29-9	KEY
J29-10	GND Flipper (left)	Gry-Blk	To Left Flipper via B1-9 & R1-1
J30-1	GND Flipper (right)	Blu-Vio	To Right Flipper via B1-10 & R1-2
J30-2
J30-3	50VDC Flipper	Yel	To Flipper via B1-3
J30-4	50VDC Flipper	Yel	To Flipper via B1-4
J30-5
J30-6	50VDC (coils)	Red	To Coils via F1-8 & direct
J30-7	50VDC (coils)	Red	To Coils via B1-1 & B1-2
J31-1
J31-2	GND 50VDC (coils)	Orn	To J10-4
J31-3
J31-4	GND +12VDC (audio)	Wht-Vio	To J1.2-2
J31-5	+12VDC (audio)	Gry	to J1.2-1 & J10-3
J31-6	KEY
J31-7
J31-8	GND Feature Lamps	Brn-Grn	To J1.2-7
J31-9
J31-10	Feature Lamps	Gry-Blk	To J1.2-6
J32-1
J32-2	+12VDC	Wht-Blk	To J1.1-1
J32-3
J32-4	-12VDC	Wht	To J1.2-5
J32-5	KEY
J32-6	+5VDC	Yel	To J1.1-7
J32-7
J32-8	GND +5VDC	Vio	To J1.1-6
J33-1	Inh. Flippers	Red-Wht	To J1.1-3
J33-2	KEY
J33-3	Inh. GI	Blu-Red	To J1.1-2
J33-4	Inh. Coils	Blk-Wht	To J10-1
J33-5	Inh. Feature Lamps	Yel-Red	To J1.1-4

3.5.2 Solenoid Driver Board

Conn-Pin	Purpose	Wire Color	To/From
J9-1	-5V	Ribbon	From J8-1
J9-2	-5V	Ribbon	From J8-2
J9-3		Ribbon	From J8-3
J9-4	5V	Ribbon	From J8-4
J9-5	5V	Ribbon	From J8-5
J9-6	5V	Ribbon	From J8-6
J9-7	GND 5V	Ribbon	From J8-7
J9-8	GND 5V	Ribbon	From J8-8
J9-9	CON 2	Ribbon	From J8-9
J9-10		Ribbon	From J8-10
J9-11	GND 5V	Ribbon	From J8-11
J9-12	CON 1	Ribbon	From J8-12
J9-13	BD 7	Ribbon	From J8-13
J9-14	BD 6	Ribbon	From J8-14
J9-15	BD 5	Ribbon	From J8-15
J9-16	BD 4	Ribbon	From J8-16
J9-17	BD 3	Ribbon	From J8-17
J9-18	BD 2	Ribbon	From J8-18
J9-19	BD 1	Ribbon	From J8-19
J9-20	BD 0	Ribbon	From J8-20
J10-1	Inh. Coils	Blk-Wht	From J33-4
J10-2	KEY
J10-3	V Audio	Gry	From J31-5
J10-4	GND Coils	Orn	From J31-2
J10-5
J10-6
J11-1	GND Coils	Orn	To Coils via B1-11
J11-2	Pop Bumper (right)	Grn-Brn	To Right PB via B1-12
J11-3	Pop Bumper (top)	Yel-Vio	To Top PB via B1-13
J11-4	KEY
J11-5	Pop Bumper (bottom)	Yel-Blu	To Bottom PB via B1-14
J11-6
J11-7
J11-8
J11-9
J11-10
J12-1	GND Coils	Orn	To Coils directly
J12-2	Ramp Diverter	Brn-Vio	Via B1-16
J12-3	Diverter Release	Yel-Blk	Via B1-17
J12-4	Drop Target 3-bank Reset	Brn-Yel	Via B1-18
J12-5	Drop Target 1-bank Reset	Grn-Blk	Via B1-19
J12-6	Eject Hole (top)	Red-Grn	Via B1-21
J12-7	Eject Hole (left)	Wht-Gry	Via B1-20
J12-8	KEY
J12-9	Eject Hole (right)	Brn-Grn	Via B1-22
J12-10	Ball Trough	Red-Blk	Via B1-23
J13-1	GND Coils	Orn	To Coils via F1-5
J13-2	Flash Lamp (Bat)	Red-Blu	Directly
J13-3	Flash Lamp (Eyes on BG)	Yel-Blk	Via F1-6
J13-4	Flash Lamp (Sun on BG)	Brn-Yel	Via F1-7
J13-5	Flash Lamp (top right)	Grn-Blk	Via B1-24
J13-6	Flash Lamp (top left)	Red-Grn	Via B1-25
J13-7	KEY
J13-8	Flash Lamp (Bat)	Red-Grn	Directly
J13-9	Gate	Yel-Red	Via B1-27
J13-10	Knocker	Wht-Grn	Directly

3.5.3 CPU Board

t.b.s.

3.5.4 Sound Board

t.b.s.

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