SONY MHCVX88
Instrukcja Serwisowa

Note: Clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.45 ± 0.3Vp-p

E-F Balance (1 Track Jump) Check
oscilloscope BD board TP (TEO) TP (VC) + �

Procedure: 1. Connect oscilloscope to TP (TEO) and TP (VC) board. 2. Turned Power switch on. 3. Load a disc (YEDS-18) and playback the number five track. 4. Press the hH button. (Becomes the 1 track jump mode.) 5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.
1 track jump waveform
Center of waveform B A (DC voltage) 0V

level=1.3±0.6Vp-p

Symmetry

Specification level: A x 100=less than ±22% B 6. After check, remove the lead wire connected in step 1.

RF PLL Free-Run Frequency Check Procedure : 1. Connect frequency counter to test point (XPCK) with lead wire.
BD board TP (XPCK) frequency counter + �

2. 3.

Turned Power switch on. Put the disc (YEDS-18) in to play the number five track. Confirm that reading on frequency counter is 4.3218MHz.

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