Sony sa c 5 b service manual
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Extracted text from sony sa c 5 b service manual (Ocr-read)
Page 1
2 SA-C5BSERVICE NOTE [When bringing in the equipment for service] The notice is shown on both Warranty Card and Repair Service column of operation manual, telling to bringing in both of the equipment (HCD-C5) and speaker system (SA-C5B) together to service station when service (repair) is needed. [How to check speaker only] When only speaker is brought in for service, check its operations by supplying both the power and the signal to the AMP board of the speaker as shown below. Check method : 1.Perform connection as shown below. - DC regulated power supply 1 (+5 V) It functions to turn on the speaker relay driver. - DC regulated power supply 2 (±20 V) It is desirable to use the DC regulated power supply of the dual tracking type that can supply its output voltages in two polarities of positive and negative polarities. However, the two units of the DC regulated power supply that supplies only a single output voltage can also be used. (See the figure below.) - Audio signal generator Output frequency : 1 kHz Output voltage : 100mV p-p or less Output impedance : 600 Ω 2.Turn on the main power of the DC regulated power supply 2. Then turn on the main power of the DC regulated power supply 1 (+ 5 V). After that, input the output signal of the audio signal generator as shown. 3.Check that the LED (D831, D832 (BLUE)) turns on and the audio signal can be heard from the spe\ aker. Notes : 1 For the speaker cord, disconnect it from the speaker or leave it open. 2 Be careful not to apply an excessive input audio signal to the speaker. 3 If the power voltage is less than +/- 14 V, the speaker relay will not be activated. [Caution when removing the front panel] The special screwdriver (Sony part code No. 7-640-005-55) of star type (six star type) is required to remove the front panel. 9 8 7 6 5 4 3 2 1 DC regulated power supply 2 Audio signal generator RELAY SP-GND +B POWER-GND -B SHIELD GND PRE-SIGNAL CN801 AMP board LED (BLUE) Speaker DC regulated power supply 1 +5V GND GND + + +20V-20V AUDIO SIGNAL COM - - DC regulatedpower supply + - DC regulated power supply + - 7 6 5 4 3 +B POWER-GND -B CN801 +20V -20V V er 1.1 2001.09
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3 3 SA-C5B - Semiconductor Location (AMP BOARD) IC801 1 2 4 5 9112 12 D831, D832 – BACK LIGHT FOR SP2 – -Semiconductor Location (LED BOARD) 1-1. PRINTED WIRING BOARD Ref. No. Location D831 A-5 D832 A-5 Ref. No. Location D821 B-3 IC801 C-1 Q821 B-1 Q822 C-2 Q823 C-2 Q824 C-3 SECTION 1 DIAGRAMS Note on Printed Wiring Board: -X: parts extracted from the component side. - : Pattern from the side which enables seeing. - Indication of transistor B These are omitted. CE Q