AIWA CSD-FD91U
Service Manual

Pin No. 37 38 39 40 41 42

Pin Name HFL SLOF CV-

I/O O

Description The HFL (high frequency level) signal is used to judge whether the main beam is positioned on the pit or on the mirror.

I I

Sled servo off control input. CLV error signal input from the DSP. RF output. Sets the RF gain and the EFM singal's 3T compensation constant togther with the

CV+ RFSM RFSO O RFSM pin. The SLC (slice level control) signal is output to control the DSP's data slice level of the

43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

SLC SL1 DGND FSC TBC NC DEF CLK CL DAT CE DRF FSS VCC2 REF1 VR LF2 PH1 BH1 LDD LDS VCC1

O RF waveform. I O I O I I I I O I +search with respect to the reference voltage). (Not connected) O O I VCC of servo and digital circuits. For the connection of bypass capacitor for the reference voltage. Reference voltage output. Sets the time constant for disc defect detection. For the connection of a capacitor to hold the RF signal peak. For the connection of a capacitor to hold the RF signal bottom. APC circuit output. APC circuit input. VCC of RF signal circuits. Input to control the DSP's data slice level. Ground of digital signals. Output for the focus search smoothing capacitor. The TBC (tracking balance control) signal sets the EF balance variation range. Not connected. Disc defect detection output. Reference clock input. 4.23 MHz is input from the DSP. Microprocessor command clock input. Microprocessor command data input. Microprocessor chip enable input. DRF (detect RF) is an output to detect the RF level. The FSS (focus search select) signal switches the focus search modes (+/-search /

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