User manual FOSTEX CR200

[. . . ] Retain instructions - The safety and operating instructions should be retained for future reference. Heed warnings - All warnings on the appliance and in the operating instructions should be adhered to. Follow instructions - All operating and use instructions should be followed. Water and Moisture - The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, and the like. [. . . ] (d) The laser diode may be damaged if the recording power is greater than the specified value. Always perform the step 1 below before making adjustments and be careful not to exceed the adjustment value by more than 50mV from the specified value in the step 3 below). [ Procedures ] When Adjusting with the multimeter (1) Fully turn VR104 (REC. PW) counterclockwise to reduce the power to the minimum. (2) Press RECORD and REC MUTE keys in this order to lights up the laser diode. (3) Adjust the voltage value of Pin 7 (PWAJT) of CN104 to the voltage value (REC. PW voltage 10mV) displayed on the pickup flexible cable using VR104 (REC. PW). Reference: When adjusting with optical power meter Objective Symptom when out of adjustment CAUTION: (a) Perform this adjustment more than two minutes after starting up the test mode (after inserting the AC plug). (b) The laser diode may be damaged if the recording power is greater than the specified value. Always perform step 1 before making adjustments and be careful not to exceed the adjustment value by more than 0. 3mW (specified value in step 3). (c) Power more than ten times greater than playback power is released during this adjustment. (2) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys. (3) Press the FINALIZE key, the PLAY key and the PAUSE key in the order to close the respective servos and put the player into play mode. GAIN) so that the lissajous waveform is symmetrical about X axis and the Y axis. CN204 (TP201) Pin 5 (FCSIN) Pin 4 (AGND) Pin 6 (FCSER) (10 : 1) (10 : 1) 100k X Y 1. 4kHz 1Vp-p Fig. 6 Higher gain Optimum gain Lower gain 37 CR200 4. 3. 22 Tracking Servo Loop Gain Adjustment Objective To optimize the tracking servo loop gain. Symptom when out of adjustment The unit does not start, during searches the acutuator is noisy, or tracks are skipped. Measurement instrument connections Oscilliscope CH1 to CN204, Pin-3 (TRKIN) via 100k resistor Oscilloscope CH2 to CN204, Pin-2 (TRKER) (SERVO UCOM BOARD assy) See Fig. 24 below. [ Settings ] CH1 : 0. 1 V/div. , X-Y mode CH2 : 10 mV/div. GND probe can be connected to CN204, Pin-4 (AGND). Disc TCD-785 Player state Test mode, play Adjustment location VR202 (TE. GAIN) (SERVO UCOM BOARD assy) [ Procedures ] (1) Set the AF generator output to 1. 2kHz and 2Vp-p. (2) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys. [. . . ] 0 1 2 3 4 Mechanism Mode PLAY OPEN STOP No. 5 6 7 8 9 Mechanism Mode SETUP TOC read SEARCH REC/PAUSE No. A B C D E Mechanism Mode REC TOC REC OPC TOC check PMA, actual pause recording 8-3. Look into the symptom thoroughly Check the location of fault (optical, electrical or mechanical system). [. . . ]