This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
Dear Sirs,
Thank you for the fast support, the manual does provide all necessary information to repair the radio. All schematics are in a good quality for reading.
The manual fits 100% to my requirements as a technican.
Kind regards Thomas
Text excerpt from page 24 (click to view)
PD-117
11. Focus Best Adjustment
Adjust this point only if adjustment was made in item 10.
Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE
TEST DISC
MAX
Innermost circumference PLAY (1 TRK)
VR156
MOTHER BOARD ASSY Adjust the RF level to maximum, with the focus error voltage within ±150mV.
Oscilloscope
GND
START
GND
TP1 (CN201)
FE RF VC
Player
DC Mode CH1: 5mV/div CH2: 20mV/div H: 200ns/div Prove (10:1)
6 1 4
MOTHER BOARD ASSY
12. Tracking Servo Loop Gain Adjustment
UNDER Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE
TEST DISC