Grundig GV 900 SV/1 Manuel De Service page 45

Troubleshooting Diagram 14 – Video/Chroma Recording (E-to-E mode is ok)
Video Record Error
(E-to-E mode is ok).
NO
Luminance signal
C206, IC201?
(ca. 0.5Vpp) at IC201-(19)?
YES
NO
Luminance signal Signal path between Pin 21 and
(ca. 0.3Vpp) at IC201-(42)? Pin 42 of IC201? C208, IC201?
YES
NO
Luminance signal Signal path between Pin 39 and
Pin 26 of IC201? C212?
(ca. 0.5Vpp) at IC201-(26)?
YES
5V at IC201-(36)?
Clock at IC201-(69, 44)
0.5Vpp / 8.86MHz
(for CCD delay line)
4.43MHz oscillation at
IC201-(73/75)?
Luminance signal NO Signal path between Pin 24 and
(ca. 0.5Vpp) at IC201-(23)? Pin 23 of IC201? C210, IC201?
YES
Luminance signal NO Peripheral circuit of
(ca. 0.5Vpp) at IC201-(13, 14)? IC201-(13, 14, 16), IC201?
YES
SP mode: FM packages (1.5Vpp) at IC201-(86/87, 89/88)?
LP mode: FM packages (1.5Vpp) at IC201-(91/92, 94/93)?
YES
Head drum ass'y?
IC201 IC202 IC651 IC701 IC702 IC703 IC704 IC705 IC801 IC901 IC902 IC1601 IC1602
S. / P. 4-26 4-26 4-25 4-22 4-21 4-22
PAL Chroma Record Error
5V at IC201-(61)?
YES
Chroma signal
(burst: 150mVpp)
at IC201-(60, 46)?
YES
Chroma signal
(burst: 200mVpp) at IC201-(58)?
YES
X501?
SP mode: Chroma signal superimposed on FM packages (1.5Vpp) at IC201-(86/87, 89/88)?
LP mode: Chroma signal superimposed on FM packages (1.5Vpp) at IC201-(91/92, 94/93)?
4-22 4-22 4-21 4-28 4-28 4-33
englisch • English • anglais
(E-to-E mode is ok).
NO
Power supply PC5V?
NO
C512, IC201?
Signal path between Pin 35 and
Pin 58 of IC201?
YES
Chroma signal
NO
(burst: 200mVss)
at IC201-(35)?
NO
5V at IC201-(36)?
YES
Clock at IC201-(69, 44)
0.5Vpp / 8.86MHz
(for CCD delay line)
4.43MHz oscillation at
IC201-(73/75)?
X501?
IC1701 IC1801 IC1901 IC1951 IC2501 IC5301 IC6301 RMC801 Tuner
4-29 4-36 4-22 4-35 4-35 4-24
SECAM Chroma Record Error
(PAL Chroma Record Mode is ok).
SECAM record mode
activated?
YES
CCVS signal muted via
NO
Q5303-(1) / High level at
CCVS signal at IC5301-(24)?
Q5303-(5)?
YES
Q210?
NO
Are the following signals
Chroma signal at IC5301-(12)?
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
Chroma signal at Q5301-(E)? Base bias at Q5301?
YES
Q5304?
NO
Signal path between Q5301
Chroma signal at IC201-(78)?
and IC201-(78)?
YES
NO
5V (PC5V) at IC201-(90)?
IC201?
4-31 4-24 4-21 4-30