Goldstar ffh-8900a Service Manual adjusments troubleshooting

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CH1 CH2

Speaker Out

Playback Mode

Head

Test Tape MTT-114

L ch

R ch

GND

Dual-trace synchroscope

Electronic Voltmeter

L out

R out

Unit

This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary.

IMPORTANT

1. Check Power-source voltage.

2. Set the function switch to band being aligned.

3. Turn volume control to minimum unless otherwise noted.

4. Connect low side of signal source and output indicator to chassis ground unless otherwise specified.

5. Keep the signal input as low as possible to avoid AGC and AC action.

ADJUSTMENTS

Deck Mode Test Tape Test Point Adjustment Adjust for

A Deck Playback MTT-114 Speaker Out DECK Screw Maximum B Deck Playback MTT-114 Speaker Out Azimuth Screw Maximum

2. MOTOR SPEED ADJUSTMENT

Figure 1. Azimuth Adjustment Connection Diagram

Figure 2. Motor Speed Adjustment Connection Diagram

Head

Playback Mode

Unit

Speaker Out

GND

L out

R out

Record/Playback head

Test Tape MTT-111

Frequency Counter

Deck Mode Test Tape Test Point Adjustment Adjust for Remark

Normal Speed MTT-111 Speaker Out VR201 3kHz ± 1% Hi-Speed MTT-111 Speaker Out more than 5.4kHz High-Speed Dubbing Mode

TAPE DECK ADJUSTMENT

1. AZIMUTH ADJUSTMENT

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3. RECORD BIAS ADJUSTMENT

Head

Unit

PN202

GND

Record/Playback head

Test Tape MTT-5511

Record/Playback and Pause Mode

Frequency Counter

Deck Mode Test Tape Test Point Adjustment Adjust for

Rec/Pause MTT-5511 ERASE HEAD Wire(PN202) L203 90kHz±5kHz

Figure 3. Record Bias Adjustment Connection Diagram

Figure 4. Tuner(S curve) Adjustment Connection Diagram

4. TUNER ADJUSTMENT

Unit

Signal Generator

GND

Electronic OSCILLOSCOPE

FM Antenna Terminal

Speake

Item Test Point Adjustment Adjust for

DC Voltage Checker Pin TP1, TP2 L106 0V±50mV

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TROUBLESHOOTING

Turn power on.

Is power on?

Does initial read work?

Does it play?

Does it output audio?

Check power supply circuit.

(Check PN 701)

Check laser circuit.

Check focus circuit.

Check disc.

Check tracking servo circuit.

Check audio circuit.

YES

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