Harman Kardon AVR 70/230, Service Manual

Page: 31 / 89

Ref No.
Sounds from Speaker when A) NOT Supported Headphone Detect.
Headphone's connected. Push the Speaker On/Off Button(Speaker off).
Bass / Treble Control Failure. A) Volume IC check. I.C109(MAIN)
1. Resister/Capacitor correction figure check.(Bass) I.C109 PIN No. ( 26,27,32,33)(MAIN)
2. Resister/Capacitor correction figure check.(Treble) I.C109 PIN No. ( 28,34)(MAIN)
AMP Sound Dead. A) Signal Mute TR's inferior. Q 105,107,109(MAIN)
1. "LEFT" Channel dead. B) Connector disconnection & disjunction. CP111(MAIN)
2. "RIGHT" Channel dead. Change or close insertion of the connector.
3. "CENTER" Channel dead. C) Speaker wire's disjunction.
4. "REAR" Channel dead. Close insertion of the speaker wire.
D) Volume IC check. I.C No. ( 109 )(MAIN)
1. I.C voltage check ( +7.5 )V, ( -7.5 )V I.C Pin No. ( 30,52)(MAIN)
2. I.C control data check. I.C PIN No. (49,50)(MAIN)
3. I.C signal IN/OUT check.
AC-3/DTS Failure. A) I.C Regulator check.
(DSP Sound Mode) DSP I/O + (3.3)V,DSP CORE + (1.2)V I.C110, I.C111(DMAIN)
CODEC + ( 5)V I.C111 (MAIN)
B) DIR check. I.C109(DMAIN)
1. OSC check. X-TAL 102(DMAIN)
2. BICK, LRCK, RDATA Check. I.C Pin No. ( 15, 16, 14)(DMAIN )
3. Micom Interface Port Check. I.C Pin No. ( 21,22,31 )(DMAIN)
C) DSP Check. I.C117(DMAIN)
1. BICK, LRCK Check. I.C Pin No. ( 162, 163 )(DMAIN)
2. Micom Interface Port Check. I.C Pin No.(7, 8, 13, 14, 146)(DMAIN)
3. SDATA 1, 2, 3,4 Check. I.C Pin No. (1, 174, 175, 176)(DMAIN)
D) D/A Check. I.C109
1. LRCK/BCK/SDATA check. I.C Pin No. ( 17,18,19)(DMAIN)
2. Signal out check. I.C Pin No. (39, 41, 43, 45, 47, 49)(DMAIN
Ref No.
Video Output Dead. A) Video Regulator voltage check.
1. DC voltage check. + ( 12 )V I.C110 (MAIN)
B) Video Mute(MONTOR,V1 OUT) port check.(IC101) I.C119 ( 23 )(DMAIN)
Cause and Remedy Symptom
Symptom Cause and Remedy