Technics SL-PG200A

| SL-PG200A
Measuring Instruments
* Playability test disc (SZZP1054C). * Dual-beam oscilloscope with bandwidth of 30MHz or
* Normal disc. better (with EXT trigger and 1: 1 probe).
(1) LASER POWER ADJUSTMENT
1. Connect the oscilloscope’s CH1 probe across (+)
and (—) of R3501 (Resistor) on the servo P.C.B.
2. Switch the player power ON, and play track No. 1 on
the test disc (SZZP1054C).
3. Adjust VR3520 so that the voltage is —50+2mV.
Oscilloscope setting: [ r
VOLT ..... cee 20mV
SWEEP............ 0.2msec.
INPUT..........0.. DC 4
(2) FOCUS OFFSET ADJUSTMENT
1. Connect the oscilloscope’s CH1 probe across R3562
(Resistor) (+) and Jumper (—) on the servo P.C.B.
2. Switch the player power ON, and play track No. 1 on
the test disc (SZZP1054C).
3. Adjust VR3569 until the signal amplitude become in
the center of 400mV.
Oscilloscope setting:
VOLT ....... eee 200mV
SWEEP............ 5msec
INPUT............. DC
(3) CHECK OF PLAY OPERATION AFTER
ADJUSTMENT
* Checking Skip Search * Playability check by test disc
1. Play an ordinary musical program disc. 1. Play the 0.7mm black dot and the 0.7mm wedge on
2. Press the skip button to check for normal skip the defect test disc (SZZP1054C) and verify that no
search operation (in both the forward and reverse sound skip or noise occurs.
directions).
* Checking Manual Search
1. Play an ordinary musical program disc.
2. Press the manual search button to check for smooth
manual search operations at either low or high
speed (in both the forward and reverse directions).