Magnavox Odyssey 4000 Capacitor Replacement Guide
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The Magnavox Odyssey 4000 (BH7511) has four aluminium electrolytic capacitors, all on the main board: three 470 µF parts around the regulator Q1 and a 10 µF part on the supply to the RF modulator. The RF modulator and the hand controls have none.[1][2][3] Magnavox's Service Manual No. 6508 gives each one's value, rating and part number in the parts list, shows it on the schematic and marks it on the board drawing.[1][3][4] For the general signs of a failed capacitor see Capacitor Failure Symptoms.
Before replacing anything
[edit | edit source]The console runs from a 9 V adaptor, so there is no mains voltage inside it.[5] Magnavox's manual names no capacitor as a known fault. Measure the regulator first, with 9 V at the adaptor input: 8.3 V at the collector of Q1, 6.9 V at its base and 6.2 V at its emitter.[3]
Electrolytic capacitors
[edit | edit source]| Ref | Value | Rating | Magnavox part no. | Circuit (schematic) | Board drawing |
|---|---|---|---|---|---|
| C1 | 470 µF | 16 V | 270144-5215 | Supply after L1 and the power switch S4, at the collector of Q1 (8.3 V) | Top left, beside C2 and R1 |
| C3 | 470 µF | 16 V | 270144-5215 | Base of Q1 with the zener Z1 (6.9 V), fed through R1 (100 Ω) | Beside Q1 and Z1 |
| C4 | 470 µF | 16 V | 270144-5215 | Regulated 6.2 V line at the emitter of Q1 | Beside L1 |
| C14 | 10 µF | 35 V | 270109-1135 | Supply to the RF modulator, after R6 (820 Ω) | Beside R6 and P4 |
The parts list and the schematic agree on all four values and ratings.[1][3] The three 470 µF parts carry a 270144 number, where the Odyssey 2000's 470 µF 16 V capacitors are 270109-5215.[1][6]
Other capacitors
[edit | edit source]The schematic's notes give capacitor tolerances as 20 % unless marked otherwise.[3]
| Ref | Type and value | Where (schematic) |
|---|---|---|
| C6, C8 | Metallised polyester, 0.068 µF 10 % 250 V | Right (C6) and left (C8) hand control inputs |
| C10 | Trimmer, 2–22 pF 100 V | Sets the 3.58 MHz clock, IC2 pin 3 |
| C11 | Ceramic, 10 pF 5 % 500 V NPO | Crystal circuit, IC2 pin 2 |
| C12, C13 | Metallised polyester, 0.1 µF 10 % 100 V | Logic input lines to IC1 |
| C19 | Metallised polyester, 0.047 µF 20 % 250 V | Hue control line, IC2 pin 4 |
Do not disturb C10 or C11 without a frequency counter to hand: the clock must be reset to 3,579,545 Hz ± 50 Hz at IC2 pin 6 afterwards, and the hue after that.[7] The RF modulator uses NPO and N220 ceramics and the trimmer C5; disturbing them means repeating the channel 3 and 4 adjustment.[2][7]
Procedure
[edit | edit source]- Unplug the adaptor and both hand controls.
- Open the cabinet as described on the maintenance page.
- Note the polarity of each capacitor; the board drawing marks the positive lead.[4]
- Fit 470 µF in C1, C3 and C4, rated 16 V or more, and 10 µF in C14, rated 35 V or more.[1]
- Clean off the flux and check 6.9 V at the base and 6.2 V at the emitter of Q1 with 9 V at the input.[3]
- Check the picture and the background colours on each game.[7]
Related pages
[edit | edit source]- Magnavox Odyssey 4000
- Magnavox Odyssey 4000 General Maintenance
- Magnavox Odyssey 4000 Troubleshooting Guide
- Magnavox Odyssey 2000 Capacitor Replacement Guide
- Capacitor Failure Symptoms
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Magnavox, Service Manual No. 6508, January 1978, p. 6508-6: BH7511 replacement parts list (coils, capacitors with type, value, rating and part number, controls and switches, semiconductors and integrated circuits, connectors, shields, RF modulator assembly, speaker, cabinet parts, hand control cable and AC adaptor). Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.
- ↑ 2.0 2.1 Magnavox, Service Manual No. 6508, January 1978, p. 6508-3: RF modulator P.C. board and replacement parts list, hand control P.C. board (211156-2) and replacement parts list, and the antenna switch box parts list. Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Magnavox, Service Manual No. 6508, January 1978, p. 6508-4: BH7511 schematic diagram, with the power input, the regulator Q1 and its voltages, IC1 and IC2 with their pin functions, the hand control connections, the sound amplifier Q2, and the notes (voltages taken with a VTVM and the adaptor input held at 9 V by a regulated supply). Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.
- ↑ 4.0 4.1 4.2 Magnavox, Service Manual No. 6508, January 1978, p. 6508-7: main P.C. board viewed from the component side (703931-1), with note 1 (in early production units pins 3 and 4 of IC1 were not joined by the copper pattern and must be joined with a solder bridge) and note 2 (the B19 jumper is screened on the board but not fitted). Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.
- ↑ Magnavox Consumer Electronics Company, Service Manual No. 6508: BH7511 Odyssey, second issue, January 1978, p. 6508-1: general information (AC to DC 9 volt 100 mA adaptor; the eight games; the three-position skill switch with Amateur, Professional and Handicap; on-screen scoring from 0 to 15; full colour on a colour television; hand controls with joysticks on cables; Fast and Slow ball speed; sound and deflection; Reset/On/Off switch; manual serve with the action buttons) and typical operation (channel switch on the RF modulator box; adaptor socket on the back of the main unit; light green Tennis background). Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.
- ↑ Magnavox, Service Manual No. 6507: BH7510 Odyssey (Odyssey 2000), October 1977, p. 6507-2: BH7510 and RF modulator replacement parts lists, with the complete RF module assembly 703938-2. Hosted as File:Magnavox Odyssey 2000 Service Manual 6507.pdf.
- ↑ 7.0 7.1 7.2 Magnavox, Service Manual No. 6508, January 1978, p. 6508-2: operation continued (spring-loaded Reset; serving with the red and blue action buttons; five serves in Tennis; serving stops at 15 until Reset), the service adjustments (3.58 MHz clock with C10 at IC2 pin 6; channel 3 and 4 RF oscillator with L3 and C5; video level with R5 for 0.8 V peak to peak; hue with R4 and the four background colours) and the top view of the BH7511. Hosted as File:Magnavox Odyssey 4000 Service Manual 6508.pdf.