GRUNDIG Service
3 - 15
k
GV 900…, GV 940…
Troubleshooting
englisch • English • anglais
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Troubleshooting Diagram 16 – E-to-E Sound
PC5V at IC6301-(14, 20, 30, 36, 51)?
PC9V at IC6301-(60)?
Audio signal at IC201-(11)?
Signal path between IC201-(11) and
IC6301-(54)?
Audio signal at IC6301-(54)?
IC6301?
Data and clock signals from
IC701-(17, 18) to IC6301-(31, 32)?
Audio signal at IC6301-(4, 46)?
Signal path between IC6301-(4, 46) and
IC6301-(5, 45)? C6302, C6320, IC6301?
Audio signal at IC6301-(5, 45)?
HiFi
IC201, C609, C609?
Standard sound
No E-to-E Sound
Check signal paths Audio left/right:
– IC6301-(2/48):
from audio inputs on the front
– IC6301-(61/52):
see Troubleshooting Diagram 24 – IN/OUT.
YES
YES
NO
IC701-(26) A-Mute Low?
IC701-(50) CVBS, IC701?
YES
YES
LINE output:
Audio signal at IC6301-(58, 56)?
HF output:
Audio signal at IC6301-(57)?
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)?
YES
NO
Audio signals at the inputs
IC201-(8, 9)?
Check audio signal paths:
– IC201-(8):
from tuner via IC1602-(10) and Q1605.
– IC201-(9):
see Troubleshooting Diagram 21 – IN/OUT.
Audio signals at inputs
IC6301-(2/48 or 61/52)?
YES
YES
YES
NO
NO
NO
FM signal (>600mVpp)
at IC6301-(29)?
FM signal at
IC6301-(26/25 and 26/22)
Signal path HiFi_CTL between
IC701-(20) and IC6301-(33)?
R352 at IC6301-(27)?
(record voltage definitely fixed)
Plug-in connection AH-MZ,
headwheel?
IC6301?
Low level at IC6301-(33)?
Troubleshooting Diagram 17 – HiFi Sound 1
No HiFi Sound Recording
(E-to-E mode is possible)
YES
YES
YES
NO
NO
NO
Troubleshooting Diagram 18 – IGR, NICAM/IGR
Signal path from IC701-(13)
to P1901-(1,2)? IC701?
Peripheral circuit of Tuner/IF?
5V at P1901-(3)
10.5V at P1901-(8)?
Power supply PC5V,
voltage STBY10.5V?
Signal path from
P1901-(4,5) to IC2501-(9,11)?
I
2
C-bus at P1901-(1,2)?
YES
NO
Signal path from IC1602-(10)
to P1901-(7)? IC1602?
MPX_DET at P1901-(7)?
No IGR, NICAM/IGR Sound
Baseband signal at P1901-(9)?
YES
NO
IGR, NICAM/IGR Module?
NF at P1901-(4,5)?
YES
NO
NF at IC2501-(9,11)?
IC2501?
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
