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Troubleshooting - Sony DVP-NS300 Training Manual

Circuit descriptions & troubleshooting.
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In Figure 6-1b, missing read/write data may be caused by a power supply failure or if Syscon IC104 held is in
constant reset.
1.1
No 33 Mhz output at Pin 77
Of IC
XRD, XWRH, CS0X,
HA 0-21 & HD 0-15
signals check
If 33 MHz is present but not the Test Mode menu, then follow the procedure in figure 6-1c, at IC503 AV
Decoder IC.
1.2
Trouble Shooting : No Test Mode Menu _ No 33Mhz output
Std-By
Yes
Can Enter
Test Mode
No
103/104
(Syscon)
No
Power supply
voltage check
76
Reset signal
check
H=OK
(3,3 V)
IC103/104
SYSCON
FIGURE 6-1b - NO TEST MODE
Trouble Shooting : No Test Mode Menu (
Std-By
Can Enter
Test Mode
No
33 Mhz output at Pin 77
Of IC
103/104
(Syscon)
Check 95Mz
At Pin 149?
Check 27Mz
Across Pin 182
Pin 180
Check
IC503/502
FIGURE 6-1b - NO TEST MODE (CON'T)
If the ICs are different, IC no. marked in red = NS700
SYSTEM CONTROL (IC103/104),
ROM (IC107 or
IC108/106 or
107),
AVD (IC503/502),
ARP&SERVO (IC302).
Should not be fixed to „H", „L" or
XFRRST
IC103/IC104
something in between!
XRD
70
XWRH
71
CS0X
58
HA & HD
If the ICs are different, IC no. marked in red = NS700
Yes
Yes
Yes
95Mz
No
CXD1933Q
28
28
OE
11
WE
IC107/106
26
CE
Flash ROM
HA & HD
33Mhz output OK
AVD Check
27MHz from
PLL IC102
182
180
CLKI
IC503/502

6. Troubleshooting

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