57
37VT-26H(GY)
YES
NO
NO
FLOWCHART NO. 1-15
VCR PLAYBACK MODE (LUMINANCE) TROUBLESHOOTING
No playback.
Are there Y/C data and
clock signals at pins (8)
and (7) of IC2201
respectively when
playback starts ?
Check the PC5V line.
NO
Check data and clock
signals from pins (72)
and (71) of IC2001.
Are there signal at pin
(30) of IC3301 ?
NO
Is there a signal at pin
(57) of IC2201 ?
NO
Is there a signal at pin
(27) of IC2201 ?
NO
Is there a signal at pin
(25) of IC2201 ?
Check TV Section.
NO
Check the H. SW. Pulse
line.
Check video head and/or
replace IC3301.
NO
Check the PC5V line.
Replace IC2201.
Is there 5V at pin (36) of
IC3301 ?
YES
YES
Is there H. SW. Pulse at
pin (1) of IC3301 ?
YES
YES
NO
FLOWCHART NO. 1-16
VCR PLAYBACK MODE (CHROMA) TROUBLESHOOTING
Playback is in black and white.
Are there Y/C data and
clock signals at pins (8)
and (7) of IC2201
respectively when
playback starts ?
Check the signal at pin
(99) of IC2201.
(Frequency, 4.43MHz
(PAL/SECAM),
Frequency, 3.58MHz
(NTSC)).
NO
Check data and clock
signals from pins (72)
and (52) of IC2001.
Is there a signal at pin
(30) of IC3301 ?
X5501, X5502 and
peripheral circuit.
Replace IC2201.
NO
Check the pin (35) of IC3301 is 0V
(Bias CTL (H) line) and peripheral
circuit of IC3301.
YES
NORMAL
ABNORMAL
YES
YES
Check connector AH.
Check between pin (30)
of IC3301 and all the way
up thru to pin (57) of
IC2201.
Is there 5V at pin (4),
(21), (48) and (63) of
IC2201 ?
YES
NO
Is there a chroma signal
at pin (7) of IC2201 ?
YES
NO
Is there a signal at pin
(10) of IC2201 ?
YES
NO
Is there chroma signal at
pin (25) of IC2201 ?
Check parts around pins
(12), (43), (45) and (10).
Check the chroma
rotation line.
Is there chroma rotation
at pin (65) of IC2201 ?
YES
YES
YES
Check the IIC bus data
and clock at pins (8) and
(7) of IC2201.
Check the system
(AUTO/PAL/SECAM/NTSC)
of the TV circuit.
Check pin (13) of IC2201.
NO GOOD
NO GOOD
NO GOOD
Head cleanning.
Check the signal line all the way up to
pin (30) of IC3301.
