Sherwood RX-772 User Manual download pdf (Page 14)

Ref No.

AMP Sound Dead. A) Signal Mute TR's inferior. Q 352( L, R), Q318(L, R)

1. "LEFT" Channel dead. B) Connector disconnection & disjunction. CP101, CN102

2. "RIGHT" Channel dead. Change or close insertion of the connector.

C) Speaker wire's disjunction.

Close insertion of the speaker wire.

D) Signal switching IC check. I.C No. ( 101 )

1. I.C voltage check ( +12 )V, ( -12 )V I.C Pin No. ( 28, 1 )

2. Switching I.C control data, clk check. I.C Pin No. ( 15, 14 )

3. Switching I.C signal IN/OUT check.

Digi-Link Failure. A) Digi-link line disconnection check.

Digi-Link IN/OUT circuit check. R ( 262, 242 ), D ( 201 )

B) Micom Interface Port Check.

1. μ-COM I.C B+(5 )V check.

2 . Digi-link data I/O data check. I.C NO. (201 ) / I.C Pin No. ( 38 )

Remote Controller Failure. A) Battery check.

B) RMC I.C & Resonator inferior.

1. μ-COM I.C B+( 5 )V check.

I.C Pin No. ( 15, 16 )

2. REMOCON data check. I.C NO. (201 ) / I.C Pin No. ( 62)

FM Failure. A) FM MUTE adjustment inferior.

B) PLL Line check.

1. PLL control data check. (Data/CE/Clock) IC201 Pin No. (26, 23, 25)

C) TUNER B+ voltage inferior. R205

D) μ-COM I.C & Resonator inferior.

I.C No. ( 201 )

1. μ-COM I.C B+( 5 )V check.

I.C Pin No. ( 15, 16 )

AM Failure. A) AM V.T voltage inferior.

B) PLL Line check.

1. PLL control data check (Data/CE/Clock) IC201 Pin No. (26, 23, 25)

C) TUNER B+ voltage inferior. R205

D) μ-COM I.C & Resonator inferior.

I.C No. ( 201 )

1. μ-COM I.C B+( 5 )V check.

I.C Pin No. ( 15, 16 )

Stereo Effect Failure. A) FM TUNED Inferior. R278, IC201 Pin No(34)

Stereo does not light up.

B) μ-COM I.C & Resonator inferior.

I.C No. ( 201 )

1. μ-COM IC B+( 5 )V check

I.C Pin No. ( 15,16 )

C) STEREO adjustment inferior. R280, IC201 Pin No(35)

D) FM MUTE adjustment inferior. I.C201 PIN No.(27)

E) μ-COM I.C & Resonator inferior.

I.C No. ( 201 )

1. μ-COM IC B+( 5 )V check

I.C Pin No. ( 15,16 )

Tuner Sound Dead. A) MUTE TR inferior. Q204

1. "L / R" Channel dead. B) Connector's disconnection or disjunction.

2. "LEFT" Channel dead. Change or Close insertion of the connector.

3. "RIGHT" Channel dead.

Symptom Cause and Remedy

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Sherwood RX-772 User Manual Page 14

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