Kenwood KRF-V7773D Service Manual page 13

Y_DETECT(Pin72) = L
COMP_A_A
VIDEO1 L
VIDEO2 H
VIDEO3 H
VIDEO4 L
AV-AUX L
DVD L
V MUTE L
• COMP_B(Pin17,18,19)
COMP_B_A
VIDEO1 H
VIDEO2 H
VIDEO3 L
VIDEO4 H
DVD L
• KRF-V7773D/VR-4080
A B
VIDEO1 L L
VIDEO2 H H
VIDEO3 H L
VIDEO4 L H
AV-AUX L H
DVD L H
V MUTE L H
8. DSP IC: ADSP-21065L(X08,IC21) CHECK METHOD
Note: This IC is scarcely damaged. Pay attention to poor soldering if replace it.
1. Set the selector to ANALOG(TAPE or TUNER). In this mode, Fs will be 48kHz.
2. Set the mode to JAZZ CLUB.
3. Check the square waveform which is 500Hz period at #76(FLG11) of IC. It is good if #76 has the waveform.
4. Check the waveform which is 30MHz at #30(CLKIN) of IC.
5. Check the voltage which is 3.3V at #157(RESET) of IC
6. Check the every ports which are 48MHz at #7(TFS0), #13(RFS1) and #18(TFS1) of IC
7. Check the every ports which are 3.07MHz at #8(TCLK0) and #15(RCLK1) of IC.
8. Check the waveform which are data at #16(DR1A) of IC. Refer to figures.
X08, IC21 (76pin)
FLG11 waveform in JAZZ club selected to TAPE.
5V/div. 2mS /div.
Check the AD converter and DIR and oscillation circuitry if you can get no good at above steps.
9. Check the waveform which are data at #11(DT0A), #12(DT0B) and #22(DT1A) of IC.
Check the DA converter and so if you can get step9, too.
CIRCUIT DESCRIPTION
COMP_A_B COMP_A_C COMP_A_D
L L
H L
L L
H H
H L
H L
H L
COMP_B_B COMP_B_C
H H
H L
H L
L L
L L
COMP_A Y_C_SEL
C D E A
L L H L
L L H L
L L H L
H L H L
L L H L
L H L H
L H H H
5V/div. 2µS/div.
KRF-V7773D/V7773D-B/V9993D
COMP_A_E
L H
L H
L H
L H
L H
H L
H H
CTRL
B V_SEL A
H L L
H L L
H L L
H L L
H L L
L L L
H L L
5V/div. 2µS/div.
CH1:
DATA
CH2:
BCK
CH3:
LRCK
DATA waveform will change figure by trigger as above.
B
L
L
L
L
L
L
L
CH1:
DATA
CH2:
BCK
CH3:
LRCK
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