Shigaclone MKII Black - The builders Thread

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#2,082
Need some help, I just finished transistioning shiga into a permanent case. I had not had operating for awhile as all parts were removed from breadboard to get layout in case. I did not re-assemble and test before mounting. Now I can not get laser to power on. I have 3 mechs, one purchased modded, one I modded, and one un-modded for testing. None will function properly. They try to read TOC and stops with -- -- on display. I have checked multiple times and all voltages look good.
Pin 1 vref-2.62Vdc
Pin 2 Com- 5.1Vdc
Pin 3 E - 2.58Vdc
Pin 4 D - 2.58Vdc
Pin 5 A - 2.58Vdc
Pin 6 B - 2.58Vdc
Pin 7 C - 2.58Vdc
Pin 8 F - 2.58Vdc
Pin 9 GND - yes
Pin 10 LD - 5.1Vdc
Pin 11 VR - GND to 9 yes
Pin 12 MD - 1.5Vdc
Pin 13 F+ - 3.7Vdc
Pin 14 T- - 3.7Vdc
Pin 15 T+ - 3.7Vdc
Pin 16 F- - 3.7Vdc
All motor functions appear to work as laser head will scan CD [BTL driver]
In a completely dark room I can not see or photograph any light from laser diode? [ NO BLOBS IN PLACE]
Any idea why laser is not working on any of these ? Would APC be functioning but some other issue cause this, I was hoping to not have to dissassemble again to get to IC's . Is a reset not happenning possibly?

best regards,
Steve
 
#2,083
Hi all,
Still toubleshooting here. The laser transistor 2N4403 is what I am looking into now. I get 4.5v from LDD pin to base, emitter is 5Vdc as well as collector. .55Vdc E-B and C-B. I am having a hard time putting on scope as part is so close to board I can't get any clips on legs. I have these numbers from touching legs with jumper wire clipped to probe with power on only. If I can get a way to see when switching CD door what should I expect to see? I assume LDD should drop from 4.5vdc to switch on laser. [E-C] Thanks for any input. I am self taught on this stuff so any info is appreciated.

best regards,
Steve
 
#2,084
SO I can't figure this out. In image from schematic the pcb for motors starts on left [1] Gnd. Plug shows 1 grnd 2 switch 3 SL+ 4 SL- 5 SP- 6 SP+
Sanyo deck shows 1 GND 2 SW 3 SL+ 4 SL- 5 SP- 6 SP+. It appears sled +/- would be reversed if I just keep the ribbon cable in order!? 1676504602059.png
I did have mech functioning on breadboard for cd play & cd door, reverse track, NO forward track. Am I missing something or would this reverse +/_ sled.
thanks for any help

best regards,
Steve
 
#2,085
Hello again. Trying to repeir my shiga.
Shiga dont read any cd. Motor, laser, focus looks like it works properly. I have change LA9242 and LC78601 chip, new laser. All v1,v2,v3,v4 have 5.01 -5.03 vdc and keeping it well.
I have measured cd decl pin out and when it stops but laser is connected i have;
Pin 1 vref-2.54
Pin 2 Com- 4.11
Pin 3 E - 2.54
Pin 4 D - 2.54
Pin 5 A - 2.54
Pin 6 B - 2.54
Pin 7 C - 2.54
Pin 8 F - 2.54
Pin 9 GND - yes
Pin 10 LD - 1.49
Pin 11 VR - GND to 9 yes
Pin 12 MD - 0.0
Pin 13 F+ - 3.6
Pin 14 T- - 3.63
Pin 15 T+ - 3.63
Pin 16 F- - 3.6
When i push cd door :
Pin 1 vref-2.54
Pin 2 Com- 4.11
Pin 3 E - 2.54
Pin 4 D - 2.54
Pin 5 A - 2.54
Pin 6 B - 2.54
Pin 7 C - 2.54
Pin 8 F - 2.54
Pin 9 GND - yes
Pin 10 LD - 1.49 to 2.24
Pin 11 VR - GND to 9 yes
Pin 12 MD - 0.0 to 0.10
Pin 13 F+ - 3.6 to 4.07
Pin 14 T- - 3.63 to 3.67
Pin 15 T+ - 3.63 to 3.66
Pin 16 F- - 3.6 to 4.02
And what is going on when i disconect laser:
Pin 1 vref-2.54
Pin 2 Com- 5.03
Pin 3 E - 2.51
Pin 4 D - 2.51
Pin 5 A - 2.51
Pin 6 B - 2.51
Pin 7 C - 2.51
Pin 8 F - 2.51
Pin 9 GND - yes
Pin 10 LD - 5.03
Pin 11 VR - GND to 9 yes
Pin 12 MD - 1.64
Pin 13 F+ - 3.58
Pin 14 T- - 3.61
Pin 15 T+ - 3.63
Pin 16 F- - 3.6
Please tel me where to search ? I have seen that i dont have 5v on two pins but 4.11v and this voltage is going from Q1 2N4403transistor .
 
#2,087
Hello again. I have change LA9242 again. And shiga is alive! It reading how many track are and plaing for 10sek. I know that problem is in laser. New laser i had i have give to my friend. Old laser is an org sanyo but i have use an potentiometr near laser.. i know i have done wrong but i was try everything to start shiga working. This laser plays for 10 seconds. Please tell me how to adj laser properly. I have ans oscilosope but dont know where to connect and what i nead to se. Please help me.
 
#2,092
yeah I switched to check. I still cannot get laser to turn on 3 different mechs modified and unmodded. I get normal voltage readings but I wonder if I am not getting threshhold current to laser. Using Salas Reflektor D for 5 volts and should have plenty current output. I don't think I would have 5vdc at transistor and after [2N4403] but no current . I am not sure where to measure / to open circuit to get mA reading to laser diode? Anybody ever done this?

regards,
Steve
 
#2,093
Hello , after 3 month, mayby 1 mont of playing chinese laser died. Music plays for 10 sec and i have problem with Read. What laser need to bay to play longer? It is hard to find an orginal sfp101n . Or what to do to play longer? im always do litle laser upgrade and change smd capacitors to silver mica caps like lots off people do. Please help me.
 
#2,094
I have bay 2 not orginal lasers. One read only number of tracks, second plays mayby 3 second. What is goin on whit this lasers? Mayby something in projekt is adjust to much and delikate lasers are domageing? did any body have that problems witch lasers?
 
#2,096
Hello i dont know what is going on witch this lassers. I have bough next 3 lassers. After change shiga works perfect , first one played 1hour, when i power of cd and power on lasser have problem witch read. Seccond one played couple days.. i dont know what is killing them. on shiga pcb i have 4x 5.00v stabs, and 8v. 2.51v reference. Orginal lasser plays 3 months. This time i have new lasser and im not changing smd capacitors on it(when lassers work well i have change 3 smd capacitors for silver mica caps)
 
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