Grundig GV 900 SV/1 Servise Manual page 47

Troubleshooting Diagram 16 – E-to-E Sound
HiFi
Check signal paths Audio left/right:
NO
Audio signals at inputs
– IC6301-(2/48):
IC6301-(2/48 or 61/52)?
from audio inputs on the front
YES
– IC6301-(61/52):
see Troubleshooting Diagram 24 – IN/OUT.
PC5V at IC6301-(14, 20, 30, 36, 51)?
NO
Audio signal at IC6301-(4, 46)?
YES
IC701-(17, 18) to IC6301-(31, 32)?
NO Signal path between IC6301-(4, 46) and
Audio signal at IC6301-(5, 45)?
IC6301-(5, 45)? C6302, C6320, IC6301?
YES
LINE output: Audio signal at IC6301-(58, 56)?
HF output: Audio signal at IC6301-(57)?
YES
LINE output: Signal path from IC6301-(58, 56) via IC2501-(36,33),-(35,32)
to LINE output?
HF output: Signal path from IC6301-(57) to audio input of the tuner (TU1551)?
Troubleshooting Diagram 17 – HiFi Sound 1
No HiFi Sound Recording
(E-to-E mode is possible)
NO
FM signal (>600mVpp)
at IC6301-(29)?
YES
NO
FM signal at
IC6301-(26/25 and 26/22)
YES
Plug-in connection AH-MZ,
headwheel?
No E-to-E Sound
NO
IC701-(26) A-Mute Low?
YES
Standard sound
Audio signals at the inputs
Audio signal at IC201-(11)?
PC9V at IC6301-(60)?
YES
Audio signal at IC6301-(54)?
Data and clock signals from
NO
IC6301?
YES
Low level at IC6301-(33)?
NO
Signal path HiFi_CTL between
IC701-(20) and IC6301-(33)?
R352 at IC6301-(27)?
(record voltage definitely fixed)
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IC701-(50) CVBS, IC701?
Check audio signal paths:
NO
– IC201-(8):
IC201-(8, 9)?
from tuner via IC1602-(10) and Q1605.
YES
– IC201-(9):
see Troubleshooting Diagram 21 – IN/OUT.
NO
IC201, C609, C609?
YES
NO
Signal path between IC201-(11) and
IC6301-(54)?
YES
IC6301?
Troubleshooting Diagram 18 – IGR, NICAM/IGR
No IGR, NICAM/IGR Sound
Baseband signal at P1901-(9)?
YES
I 2 C-bus at P1901-(1,2)?
YES
5V at P1901-(3)
10.5V at P1901-(8)?
YES
MPX_DET at P1901-(7)?
YES
NF at P1901-(4,5)?
YES
NF at IC2501-(9,11)?
YES
IC2501?
NO
Peripheral circuit of Tuner/IF?
NO
Signal path from IC701-(13)
to P1901-(1,2)? IC701?
NO Power supply PC5V,
voltage STBY10.5V?
NO
Signal path from IC1602-(10)
to P1901-(7)? IC1602?
NO
IGR, NICAM/IGR Module?
NO Signal path from
P1901-(4,5) to IC2501-(9,11)?
S. / P.
IC201 4-26
IC202 4-26
IC651 4-25
IC701 4-22
IC702 4-21
IC703 4-22
IC704 4-22
IC705 4-22
IC801 4-21
IC901 4-28
IC902 4-28
IC1601 4-33
IC1602 4-29
IC1701 4-36
IC1801 4-22
IC1901 4-35
IC1951 4-35
IC2501 4-24
IC5301 4-31
IC6301 4-24
RMC801 4-21
Tuner 4-30