J'en ai déjà bavé à dépanner des JCM 2000 ! Notamment des TLS à 3 canaux...
Le piège des ces schémas est que chaque carte possède des connecteurs J1, J2, Jn , et des prise W1 à Wn ! Donc les prises W11 et W13 de la carte principale ne sont pas les mêmes que les W11 et W13 de l'alim !
Sur un autre schéma de la carte ppale, TL10-60 00, est indiqué que l'enroulement supérieur du transfo d'alim est dédié au bias : (en pièce jointe). C'est celui qui ne porte aucune indication sur ton schéma (il y a heater, HT et donc le troisième serait le bias, 2 fils blancs à priori)
J'avais trouvé (et perdu) une liste des correspondances entre les connecteurs des diverses cartes.
Lien utile :
http://lynx.bc.ca/~jc/TSL122.html
Entretemps j'ai retrouvé l'info sur un forum :
JCM2-60-00 PCB Connectors (Main PCB) ISSUE 5
============================================
Con1 -> Bias
Con2 -> TL10-65-00 Con1
Con3 -> TL10-65-00 Con6
Con4 -> TL10-61-00 Con8
Con5 -> TL10-61-00 Con4
Con6 -> TL10-65-00 Con2
Con7 -> TL10-61-00 Con15
Con8 -> Reverb Con1
Con9 -> TL10-61-00 Con11
Con10 -> TL10-62-00 Con6
Con11 -> TL-61-00 Con12
Con12 -> TL-61-00 Con20
Con13 -> TL-61-00 Con18
Con14 -> TL-62-00 Con2
W1 --> Chassis (earth)
W2 --> TL-62-00 W4 (Feedback)
W3 --> OP-TX (White)
W4 --> OP-TX (Purple)
W5 --> OP-TX (Blue)
W6 --> Mains PCB W5 (Pink)
W7 --> PWR-TX (Purple)
W8 --> N.C.
W9 --> PWR-TX (Red)
W10 --> PWR-TX (Red)
W11 --> PWR-TX (White)
W12 --> PWR-TX (Black)
W13 --> PWR-TX (White)
W14 --> Chassis (earth)
TL10-61-00 (Lead/Lead Crunch PCB) ISSUE 4
=========================================
Con1 -> TL10-65-00 Con5
Con2 -> TL10-62-00 Con7
Con3 -> TL10-62-00 Con5
Con4 -> TL10-60-00 Con5
Con5 -> TL10-66-00 Con1
Con6 -> TL10-66-00 Con2
Con7 -> TL10-65-00 Con3
Con8 -> TL10-60-00 Con4
Con9 -> TL10-66-00 Con3
Con10 -> TL10-65-00 Con4
Con11 -> TL10-60-00 Con9
Con12 -> TL10-60-00 Con11
Con13 -> Reverb Con2
Con14 -> TL10-66-00 Con4
Con15 -> TL10-60-00 Con7
Con16 -> TL10-62-00 Con3
Con17 -> TL10-66-00 Con5
Con18 -> TL10-60-00 Con13
Con19 -> TL10-62-00 Con1
Con20 -> TL10-60-00 Con12
VR1: (A1M) Gain Lead Ch.
VR2: (A1M) Volume Lead Ch.
VR3: (B200K) Treble Lead Ch.
VR4: (B20K) Mid Lead Ch.
VR5: (A1M) Bass Lead Ch.
VR6: (B20K) Reverb Lead & Crunch Ch.
VR7: (B200K) FX Mix Lead & Crunch Ch.
VR8: (B5K) Presence Lead & Crunch Ch.
SW1: (4PDT) Tone Shift Lead Ch.
SW2: (DPDT) Deep Lead & Crunch Ch.
SW3: (DPDT) V.P.R (Virtual Power Reduction)
SW4: (DPDT) Output Mute
LED1: Red 5mm
TL10-62-00 (Output PCB) ISSUE 4
===============================
Con1 -> TL10-61-00 Con19
Con2 -> TL10-60-00 Con14
Con3 -> TL10-61-00 Con16
Con4 -> Reverb Con 3
Con5 -> TL10-61-00 Con3
Con6 -> TL10-60-00 Con10
Con7 -> TL10-61-00 Con2
Din1: Foot Controller
JS1: 4 or 8 Ohm Parallel output
JS2: 4 or 8 Ohm Parallel output
JS3: 16 Ohm Only output
JS4: Effects Loop B Return
JS5: Effects Loop B Send
JS6: Effects Loop A Return
JS7: Effects Loop A Send
SW1: (DPDT Slide) Select 8 ohm / 4 ohm
SW2: (DPDT) Loop Level (Effects Loop B)
SW3: (DPDT) Loop Level (Effects Loop A)
L1: Emulated line out
W1 --> OP-TX 8ohm (Orange)
W2 --> N.C.
W3 --> OP-TX 4ohm (Green)
W4 --> TL10-60-00 W2 Feedback (Yellow)
W5 --> OP-TX 0V (Black)
W6 --> OP-TX 16ohm (Red)
TL10-65-00 (Clean PCB) ISSUE 4
==============================
Con1 -> TL10-60-00 Con2
Con2 -> TL10-60-00 Con6
Con3 -> TL10-61-00 Con7
Con4 -> TL10-61-00 Con10
Con5 -> TL10-61-00 Con1
Con6 -> TL10-60-00 Con3
VR1: (A200K) Gain Clean Ch.
VR2: (A1M) Treble Clean Ch.
VR3: (A200K) Mid Clean Ch.
VR4: (B20K) Bass Clean Ch.
VR5: (A1M) Volume Clean Ch.
SW1: (DPDT) Mode Select (Clean) / (OD1(Crunch)-OD2(Lead))
SW2: (DPDT) Mid Boost Clean Ch.
SW3: (DPDT) OD1(Crunch) / OD2(Lead)
LED1: Yellow 5mm
TL10-66-00 (Crunch/Clean PCB) ISSUE 3
=====================================
Con1 -> TL10-61-00 Con5
Con2 -> TL10-61-00 Con6
Con3 -> TL10-61-00 Con9
Con4 -> TL10-61-00 Con14
Con5 -> TL10-61-00 Con17
VR1: (A200K) Gain Crunch Ch.
VR2: (A1M) Volume Crunch Ch.
VR3: (B200K) Treble Crunch Ch.
VR4: (B20K) Mid Crunch Ch.
VR5: (A1M) Bass Crunch Ch.
VR6: (B20K) Reverb Clean Ch.
VR7: (B200K) FX Mix Clean Ch.
VR8: (B5K) Presence Clean Ch.
SW1: (4PDT) Tone Shift Crunch Ch.
SW2: (DPDT) Deep Clean Ch.
NOTE: Schematic amendum for C10 & R12 make no sense on PDF scheme seeing
that this is an ISSUE 3 board and has no R12, and C10(22nF) is installed.
Also R2 & C4 which have been highlighted are installed.
I think this might be a typographical error ???
All 5.08mm pitch polyester MKT CAPS are 100 volt types and not 63 volt
throughout the entire amplifer.
MARSHALL SERVICE BULLETIN
SUBJECT: Bias Info/Procedure for JCM2000 series Marshall amplifiers
THEORY OF OPERATION: We are setting the bias using the current method
instead of cross over distortion method. The Bias PCB assembly is as
follows:
PR1: Bias mini-pot adjustment for pin1 which is one side of the push
pull amp (two output tubes in a 100watt amp and one output tube
in a 50watt amp).
Pin1: Connected to the cathode of the output tube(s) which then goes
through a 1 ohm resistor then to ground.
Pin2: ground reference.
Pin3: Same as pin1 but for the other side of the push/pull amp.
PR2: Bias mini-pot adjustment for pin3, the other side of the
push/pull amp.
PROCEDURE:
1. Make sure amplifier is connected to a load with the proper impedance
selected.
2. Power up amplifier on STANDBY and let the circuit stabilize for a
couple of minutes.
3. Locate the male three pin molex connector (CON2) with the two
mini-pots (PR1 and PR2) on both ends found on the bottom of the tube
bay.
4. Connect DMM (set to read mV) with alligator leads, reference
common lead to center pin (pin2) on molex connector CON2 and positive
lead to pin1 on CON2.
5. Take amplifier off of STANDBY with no signal, adjust mini-pot (PR1)
closest to pin that the positive lead from your DMM is connected to
and set it to the mV voltage that is listed in the chart below. 6.
Repeat steps 4 & 5 for pin3 and until both pin1 and pin3 mV are the
same.
BIAS CHART mV SETTINGS
(pin1 and pin3)
DSL50 45mV
DSL100 90mV
DSL201 0.675V
DSL401 1.375V
TSL60/61/62 80mV
TSL100/122 90mV
Voilà, en espérant que cela correspond à ton modèle ...