Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
Text excerpt from page 8 (click to view)
CD-423M/423M-S/424M/DPF-J3030/J5030
ADJUSTMENT
No. ITEM INPUT SETTING OUTPUT SETTING PLAYER SETTING ALIGNMENT POINT ALIGN FOR FIG. 1. With pressing the REPEAT KEY, turn the power on to enter the test mode. 2. Set the Test disc to Disc NO. 1. 3. Close the door. FOCUS ERROR BIAS Test disc Type4 /KTD-02 Connect an oscilloscope as follows. CH1:RF (CN2-1) Connect the DC voltmeter to LASER CURRENT CHECK LAND on X32. Press the PLAY /PAUSE key . Confirm that the display is "05". Press the PLAY /PAUSE key to check that the display is 03 or 05. FE BIAS VR1 Optimum eye pattern
1
(d)
2
LASER CURRENT CHECK
Test disc Type4
-
0.5±0.2V
Note: Type 4 disc :SONY YEDS-18 Test Disc or equivalent. LPF : Around 47k� + 390 pF or so. FIG. (d) ¶ RF signal in test mode (PLAY).
RF signal
¶ Perform the tangential and focusing offset are focused into one point on the display. The crossing points above and below the center shall also be looked clearly. (FE BIAS)
