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DECODER PCB
PCB with Code
Expired, added, modified
R3501, 3502, 3504 and 3508 changed to 8M2
R3503. 3507 changed to 18k
R3305, 3509 changed to 180k
R2505 changed to 2k7
Stabilizer PCB for the power supply of Erco circuit
expired. Demod-Erco interface PCB applied.
R3515 changed to 1k
R3527 changed to 390Ω (390E)
R3521 changed to 10k
R3530 changed to 10k
R3536 changed to 180k
R3537 changed to 220k
Introduction of changed print layout 4 and service print.
R3537 changed to 100k
R3585 has been changed to 620Ω
R3586, 3587 expired.
R3501 has been changed to 1Ω
R3506, 3508 expired.
R3549 has been changed to 4k7
D6560 and R3550 expired.
C2540, R3551, R3552, D6556 and D6557 added.
Demod-Erco interface PCB expired.
C2514 changed to 22nF
C2515 changed to 1µF
R3514 expired.
R3516 changed to 3k9
C2517, R3522. R3531. D6542 and D6543 added.
PRE-AMP + LASER PCB
PCB with Code
Expired, added, modified
C2142 expired
Added R3193, R3195 and D6116.
Connector A12 is rotated through 180°.
Note: Only on this PCB marked with A02 is it mounted
in this way.
R3152 changed to 12k
R3115, 3116, 3118 and 3119 changed to 680k
R3180 changed to 15 k
Added 100nF capacitor between points 4 and 8 of
IC6114.
Added 10nF capacitor between points 4 and 7 of
IC6107.
R3152 changed to 15 k.
Introduction of modified PCB layout M2.
Introduction of modified PCB layout M3.
Reason
Improved drop-out behaviour.
New Erco IC (M4281).
Protection of Demod-IC and Decode µP
against electrostatic discharges.
Better signal processing of the HF detector
circuit.
Preventing uncontrolled quick search.
Installation of channel matching is
unnecessary.
Installation of the PLL coil is not applicable.
Suppress the power off click.
New Erco-IC M4282 applied.
Reduce interpolation at black spots on the
CD
New Demod-IC SAA7010 added.
Reason
Protection of the laser-diode.
Coil focus unit wound incorrectly.
Note: when replacing with a new focus coil,
turn A12, see chapter 12 (Additional
information)
Increasing the HF output voltage
Increasing the laser current.
Adjustment of the control range of the laser
current setting.
Protection of the laser diode against
electrostatic discharges.
Increasing the HF output voltage.
Modified laser diode power supply.
Prevent the laser from burning when the
lid is open
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