Grundig GV 900 SV/1 Servise Manual page 46

Troubleshooting Diagram 15 – Video/Chroma Playback
Video Playback Error
(E-to-E mode is ok).
NO
Signal path between Pin 79 and
FM packages (ca. 0.3Vpp) at
Pin 78 of IC201?
IC201-(78)?
YES
NO
FM packages (ca. 0.3Vpp) at
Headwheel?
IC201-(79)?
IC201+
YES
Head switching pulse
peripheral
(V-H.SW.P.) at IC201-(81)?
circuit?
Signal path between IC701-(23)
IC701?
and IC201-(81)?
Peripheral circuit of
NO
Luminance signal
IC201-(13, 14, 16, 17)?
at IC201-(13, 14, 16)?
Q201...Q206, IC201?
YES
NO
Luminance signal (ca. 0.5Vpp)
C206, IC201?
at IC201-(18, 19)?
YES
NO
Luminance signal (ca. 0.4Vpp)
C208, IC201?
at IC201-(21, 42)?
YES
NO
Luminance signal (ca. 0.4Vpp)
C212, IC201?
at IC201-(39, 26)?
YES
Luminance signal (ca. 0.5Vpp) NO
C210, IC201?
at IC201-(24, 23)?
YES
IC201?
IC201 IC202 IC651 IC701 IC702 IC703 IC704 IC705 IC801 IC901 IC902 IC1601
S. / P. 4-26 4-26 4-25 4-22 4-21
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PAL Chroma Playback Error
5V at IC201-(61)
YES
Chroma signal
(burst: 150mVpp)
at IC201-(46)?
YES
YES
Chroma signal
(burst: 200mVpp)
NO at IC201-(58)?
YES
Chroma signal
(burst: 200mVpp)
at IC201-(55, 54)?
NO
C514, R504, IC201?
IC201?
5V at IC201-(36)?
Clock at IC201-(69, 44) 0.5Vpp / 8.86MHz (for CCD delay line)?
4.43MHz oscillation at IC201-(73/75)? X501?
4-22 4-22 4-22 4-21 4-28 4-28 4-33
(E-to-E mode is ok).
NO
Power supply PC5V?
NO
Signal path between Pin 60 and
Pin 46 of IC201? C512, IC201?
Chroma signal
NO
(burst: 200mVpp)
at IC201-(35)?
NO YES
Signal path between
YES
Pin 35 and Pin 58
of IC201?
IC1602 IC1701 IC1801 IC1901 IC1951 IC2501 IC5301 IC6301 RMC801 Tuner
4-29 4-36 4-22 4-35 4-35
SECAM Chroma Playback Error
(PAL Chroma Playback is ok).
SECAM playback mode
activated?
YES
NO
Signal path between IC201-(79)
Chroma signal at IC5301-(21)?
and IC5301-(21)?
YES
NO
Chroma signal at IC5301-(15)? Are the following signals
applied to the pins of IC5301?
YES
Pin 4: 4.286MHz
Pin 6: EE (L)
Pin 7: SECAM (H)
Pin 9: C-SYNC
Pin 10: FV PULSE
Peripheral circuit of IC5301?
5V (PC5V) at IC5301-(5, 17)?
IC5301?
NO
Base bias at Q5302?
Chroma signal at Q5302-(E)?
YES
5V (SECAM_(H)) at IC5301-(7)?
Q5302?
NO
Peripheral circuit of
Chroma signal at IC201-(54)?
IC201-(55/54), IC201?
4-24 4-31 4-24 4-21 4-30