Philips Odyssey 2100 Troubleshooting Guide

Philips's schematic of the Odyssey 2100 (type G7513), drawing 13978E2, with DC voltages at the IC pins (service manual CS43618, p. 3)

The Philips Odyssey 2100 (type G7513) has four ICs and one transistor: the game chip IC1 (MM57186), the clock generator IC2 (MM53114), the LM1889 modulator IC3, the 12 V regulator IC4 and TS1, which makes the -8 V line. Philips's service manual CS43618 has no fault chart, but its schematic marks the DC voltage at most IC pins, which is enough to find a dead supply, a stopped oscillator or a broken controller lead. Opening the console and the three adjustments are on Philips Odyssey 2100 General Maintenance, along with the list of normal behaviour that is easily mistaken for a fault.

Measuring

The circuit works below its ground. IC4's output is the circuit ground (0 V), its common terminal is line B at -12 V, and the adaptor's positive terminal A sits at +12 V, with 24 V between A and B. Clip the meter's black lead to ground, for example IC1 pin 12, 16, 17 or 18, and expect most readings to be negative. The schematic does not say what meter the voltages were taken with, or with which game running.

Symptoms

Odyssey 2100 symptoms, where to look and what to check

Symptom	Where to look	Check
No picture, no sound	Adaptor U1, plug PL1 and socket BU1; C1; regulator IC4	24 V between A and B at BU1 (the photographed FW 8009 adaptor is rated 18.6 V at 120 mA); -12 V on line B; -12 V at IC3 pin 5
-12 V present, still nothing	TS1 (BC327) with R1 (560 Ω) and R2 (1.5 kΩ)	-8 V at IC1 pin 7 and on the -8 V line feeding IC1 pin 4
Both supplies correct, no picture	4.43 MHz oscillator in IC3 (crystal KT1, trimmer C13); clock generator IC2	4.433618 MHz at IC3 pin 17 on a frequency counter; IC2 pin 2 -5 V, pin 1 -7 V; IC2 pins 6 and 5 (-6 V and -5.5 V) feed IC1 pins 13 and 15
Picture without colour, or wrong colours	C13 setting; the colour-difference lines from IC1 to IC3	Reset C13 for 4.433618 MHz; IC3 pins 2 and 3 about -5.5 V, pin 4 -5 V to -6 V
Picture, no sound	Television volume; 5.5 MHz sound oscillator (S1, C11, R5); the audio feed from IC1 pin 5 through C10	Set S1 for 5.5 MHz with a counter at point 5 of IC1; IC1 pin 5 about 0.5 V; IC3 pin 15 0 V
Picture on one channel only	The channel coil for the dead channel (S3 for E3, S2 for E4); the CH3/CH4 switch and R16 (100 Ω)	Repeat the channel adjustment; the coil feeds read -1 V on the selected channel and -7 V on the other
Weak or noisy picture on both channels	Aerial lead and plug; RF output filter (S4, S5, C22 to C27, R19 to R22); IC3 pins 10 and 11	Continuity of the aerial lead; IC3 pins 10 and 11 at 0 V
One bat does not move	Its potentiometer (R25 right, R26 left); the wiper lead (R1, L1); R23 or R24 (2.2 kΩ); C7 or C6 (100 nF)	IC1 pin 1 (right) or pin 2 (left) should swing between about -1 V and -11 V as the knob turns
Left knob has no effect and the green knob moves the play	Blue knob turned fully left; the end contact on R26 and wire L2	Turn the blue knob away from the end stop; check that the R26 end contact opens
Game variant cannot be changed	Button SK8 on the left controller; wire L3	SK8 joins IC1 pin 24 to the -12 V wire L4; pin 24 should go to -12 V while it is pressed
Score will not reset, bat size will not change	Button SK7 on the right controller; wire R3	SK7 joins IC1 pin 23 to the -12 V wire R4; pin 23 should go to -12 V while it is pressed

The clock path matters for the third row. On the schematic IC2 takes its input through C9 from IC3 pin 17, the 4.43 MHz oscillator, and IC1's clock comes from IC2. If the crystal oscillator stops, the game chip loses its clock as well as the colour subcarrier.

Pin voltages

All readings are from the schematic and are relative to circuit ground.

IC1 (MM57186) and IC2 (MM53114)

IC1 pin	Connection	Reading	IC2 pin	Connection	Reading
1	Right controller (through R23)	-1 V to -11 V	1	Through R4 (2.2 kΩ) from -12 V	-7 V
2	Left controller (through R24)	-1 V to -11 V	2	Input from IC3 pin 17 through C9	-5 V
3		0 V	3, 7	Supply	-12 V
4	Supply	-8 V	5	Clock out to IC1 pin 15	-5.5 V
5	Audio out	0.5 V	6	Clock out to IC1 pin 13	-6 V
6	Video out	-6 V	8	Ground	0 V
7		-8 V
8, 9, 10	Chroma out (B-Y on 8, R-Y on 9)	See IC3 pins 2 to 4
12, 16, 17, 18	Ground	0 V
14	Supply	-12 V
19, 20, 21	Not connected
22	R3 (68 kΩ) to -12 V and C5 (1 µF) to ground	Not marked
23	Reset button SK7
24	Game select button SK8

IC3 (LM1889)

Pin	Connection	Reading
1	4.43 MHz oscillator network	-2.5 V
2	R-Y from IC1 pin 9	-5.5 V
3	From IC1 pin 10	-5.5 V
4	B-Y from IC1 pin 8	-5 V to -6 V
5	Supply, with C21 (10 nF)	-12 V
6 to 9	Channel oscillator coils S2 and S3	-1 V on the selected channel's side, -7 V on the other
10, 11	RF output to the filter and aerial lead	0 V
12	Video from IC1 pin 6 through R6, with the 5.5 MHz sound carrier	-6 V
13	Through R8 (2.2 kΩ) from -8 V	-8 V
14, 16	Ground	0 V
15	5.5 MHz tank (S1, C11)	0 V
17	4.43 MHz oscillator out, to IC2 through C9	-3 V
18	4.43 MHz oscillator network	-3 V

Board legends

The board's own markings differ from the service manual. It names the BC327 Q1 (TS1 in the manual), the crystal X'TAL 1 (KT1) and the channel coils L2 and L3 (S2 and S3), and it has test legends "-15 Volts" and "-9 Volts" where the schematic shows the -12 V and -8 V lines. Find parts by position on the service manual's board layout, not by the silkscreen numbers, and measure the supplies against the schematic's values.

Replacing parts

• IC1 sits in a 24-pin socket and can be lifted out without soldering.
• The parts list gives Philips 12NC numbers for IC1 (4822 209 10025), IC2 (4822 209 10023), IC3 (4822 209 80387), IC4 (4822 209 80417), TS1 (4822 130 40854) and the crystal KT1 (4822 242 70147).
• After replacing IC3, KT1 or any part of the tuned circuits, repeat the three adjustments on Philips Odyssey 2100 General Maintenance.
• For failed electrolytic capacitors see Philips Odyssey 2100 Capacitor Replacement Guide and Capacitor Failure Symptoms.

Related pages

• Philips Odyssey 2100
• Philips Odyssey 2100 General Maintenance
• Philips Odyssey 2100 Capacitor Replacement Guide
• Philips Odyssey 2100 Documentation