It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
Text excerpt from page 10 (click to view)
DMC-J3
CIRCUIT DESCRIPTION
3. TEST MODE
2) To change setting value is available +2 or -2 steps by VOL UP/DOWN key. Disc stops to turn after memorizing the value to E2PROM by PLAY/PAUSE key or not memorizing it to E2PROM by STOP key. Display shows setting value+80h. Remote cont [74 127] changed value [TEST 1] the stop key is pressed [o1] [oo] changed value the stop key is pressed
3. TEST MODE
7) Average data of VC/FE Offset [127F7F] mid 2 figures: VC offset compensation value+80h right 2 figures: FE offset compensation value+80h 8) Average Data of ABCD Offset [13 41] right 2 figures: FE offset compensation value
Unit
3-2 TEST MODE II (AUDIO SPEC)
* Item of audio specification 3-2-1 Procedures 1) Connect #43(TEST0) of IC5 to 2.8V(VDD) and #42(TEST1) of that to GND. Next Connect AC adapter to the unit.(the unit will be in CPLAY mode after TOC reads) Remocon [TEST 4] Unit [o4]
3-1-4 Automatic Adjustment results in Stop Mode After Adjustment * Result will be shown cyclically by SHIT key as follows. Left 2 figures shows display contents number. Example is in remote controller. 1) TOC reading address Remote cont [01FFD0] right 4 figures: header adds/cluster only 2) FOCUS BIAS Value Setting [077272] mid 2 figures: high reflection bias value right 2 figures: low reflection bias value 3) High reflection EF Balance [08 10]
2) The unit will be in CPLAY after TOC reading. Remocon [TOC OK] Unit [o4]
right 2 figures: value
4) Low reflection Pit /Groove of FE Balance [090F0F] mid 2 figures: pit�s FEbalance right 2 figures: groove�s FE balance 5) High reflection Auto Gain Filter of Focus and Tracking [103F40] mid 2 figures: focus gain value right 2 figures: tracking gain value 6) Low reflection Auto Gain Filter of Focus and Track [113538] mid 2 figures: focus gain right 2 figures: tracking gain
3) Choose and playback TNO-02 on the disc by PLAY/PAUSE key Remocon [02] playback TNO Unit [o4]
4) Choose and playback every TNO in the above table by PLAY/PAUSE key. TNO will be chosen TNO 02 if repressing the PLAY/PAUSE key after STOP key pressed, Remocon [05] playback TNO Unit [o4]
