Grundig GV 900 SV/1 Servise Manual page 48

Troubleshooting Diagram 19 – HiFi Sound 2
Playback of HiFi Sound not possible
(E-to-E mode is possible)
NO
Playback envelope (ca. 0.3Vpp) Head switching pulse (A-H.SW.P.)
at output IC6301-(19)?
YES
IC6301-(17) High? IC6301?
Troubleshooting Diagram 20 – Standard Sound
Standard Sound Error
(HiFi - E-to-E mode is o.k.)
NO Signal path AUDIO_MUTE_(H) from
Low signal at IC201-(99)?
YES
NO
Audio signal at IC201-(4)?
YES
NO
12V at T651, contact 2?
YES
NO
Erase oscillator (T651, Q651, Q652)
Erase voltage at T651, contact 5?
YES
Record signal (Bias+Audio) NO
at T651, contact 6? A_ERASE_BIAS_CTL IC651-(4)?
YES
Plug-in connection MH-AA?
A/C head?
englisch • English • anglais
Signal path between headwheel
and IC6301, IC6301?
YES
at IC6301-(35)?
NO
Signal path between
IC6301-(35) and IC701-(26)?
IC701-(21) to IC201-(9)?
IC201?
Power supply M12V?
and A/C head?
Peripheral circuit of T651,
Troubleshooting Diagram 21 – IN/OUT
No Video and Audio Signal
at Euro-AV Socket
5V at IC2501-(15, 17)?
NO
(for video section)
YES
10.5V at IC2501-(8, 10)? NO
(for audio section)
YES
NO
SDA and SCL signals at Signal path between IC2501-(25, 26)
IC2501-(25, 26)?
YES
Check the video and audio signal
paths according to the funciton
Note:
logic table below.
Euro-AV socket E1:
Euro-AV socket E2:
HiFi Stereo
Switch Setting IC2501
Input Signal from
Input Output
IC701-(47), video output Pin 19 A Pin 20
E2 -(20), video input Pin 18 B
IC6301-(58), audio output left Pin 36 A Pin 35
E2-(6), audio input left Pin 1 B
IC6301-(56), audio output right Pin 33 A Pin 32
E2-(2), audio input right Pin 3 B
Q1612, Tuner video output Pin 16 A Pin 23
E1-(20), video input Pin 14 B
IC701-(47), video output Pin 19 C
Stereo/Nicam Decoder output left Pin 9 A Pin 29
E1-(6), audio input left Pin 5 B
IC6301-(58), audio output left Pin 36 C
Stereo /Nicam Decoder output right Pin 11 A Pin 28
E1-(2), audio input right Pin 7 B
IC6301-(56), audio output right Pin 33 C
E2-(20), video input Pin 18 A Pin 21
E1-(20), video input Pin 14 B
Q1612, Tuner video output C
Pin 16
E2-(6), audio input left Pin 1 A Pin 31
E1-(6), audio input left Pin 5 B
Stereo /Nicam Decoder output left Pin 9 C
E2-(2), audio input right Pin 3 A Pin 30
E1-(2), audio input right Pin 7 B
Stereo /Nicam Decoder output right Pin 11 C
Mono
Switch Setting IC2501
Input Signal from
Output
Input
IC701-(47), video output Pin 19 A
Pin 20
E2 -(20), video input Pin 18 B
IC201-(11), audio output Pin 36 A
Pin 35
E2-(2, 6), audio input Pin 1 B
Q1612, Tuner-video output A
Pin 16 Pin 23
E1-(20), video input B
Pin 14
IC701-(47), video output C
Pin 19
Q1605, Tuner audio output A Pin 29
Pin 9
E1-(2, 6), audio input B
Pin 5
IC201-(11), audio output Pin 36 C
E2 -(20), video input A Pin 21
Pin 18
E1-(20), video input B
Pin 14
Q1612, Tuner video output C
Pin 16
E2-(2, 6), audio input Pin 1 A Pin 31
E1-(2, 6), audio input Pin 5 B
C
Q1605, Tuner audio output Pin 9
Power supply STBY5V?
Power supply STBY10.5V?
and IC701-(17, 18)?
Input and output
Input; output only
for decoder operation
Output Signal to
E1-(19), video output
E1-(3), audio output left
LINE output left
E1-(1), audio output right
LINE output right
E2-(19), video output
E2-(3), audio output left
E2-(1), audio output right
IC201-(31), video input
IC201
IC202
IC6301-(61), audio input left
IC651
IC701
IC6301-(52), audio input right
IC702
IC703
IC704
IC705
IC801
Output signal to
IC901
E1-(19), video output
IC902
IC1601
E1-(1, 3), audio output
IC1602
E2-(19), video output IC1701
IC1801
IC1901
E2-(1, 3), audio output
IC1951
IC2501
IC201-(31), video input
IC5301
IC6301
IC201-(9), audio input
RMC801 4-21
Tuner
S. / P.
4-26
4-26
4-25
4-22
4-21
4-22
4-22
4-22
4-21
4-28
4-28
4-33
4-29
4-36
4-22
4-35
4-35
4-24
4-31
4-24
4-30