Pioneer SX 939 Repair and Restore
- Thread starter Spenser
- Start date
Indicator Lamps:
Just a note here on indicator-lamp-specs -- evidence of what's original in the machine from what I've seen.
FM indicator lamp was burned out
Pulled the lamp.
Markings are 8V 0.05A and 4.28mm is the diameter.
I had a Dave Wojo 8V 50mA 4.12mm that I installed to good effect..
Just a note here on indicator-lamp-specs -- evidence of what's original in the machine from what I've seen.
FM indicator lamp was burned out
Pulled the lamp.
Markings are 8V 0.05A and 4.28mm is the diameter.
I had a Dave Wojo 8V 50mA 4.12mm that I installed to good effect..
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Hard to tell. It's a xyraytonyb pick. Story might be perform well there and be more durable plus is what he had on hand.
Working on tuner board now. I've got all the old caps out and the new ones in. Need to check my work, though, before I re-connect the few wires I unwound in order to lift and work on the board.
Found a typo in my substitutions list. C53 is a 47uF cap NOT 4.7uF. Sorry. I did not have a UPW series Nichicon on-hand, so I used a Panasonic KA series 47uF 25V which I think should work well. ECE-A1EKA470.
I will say also I failed to check lead spacing for the film caps when I made the switch and ordered those for the tuner board. One of the 1uF ones was a stretch. C31. Spacing for in the C31 position was around 9.4 mm. Definately would have been more comfortable with a "cut tape" one there (MUCH longer leads). Thanks.
Found a typo in my substitutions list. C53 is a 47uF cap NOT 4.7uF. Sorry. I did not have a UPW series Nichicon on-hand, so I used a Panasonic KA series 47uF 25V which I think should work well. ECE-A1EKA470.
I will say also I failed to check lead spacing for the film caps when I made the switch and ordered those for the tuner board. One of the 1uF ones was a stretch. C31. Spacing for in the C31 position was around 9.4 mm. Definately would have been more comfortable with a "cut tape" one there (MUCH longer leads). Thanks.
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You were not able to un-solder and remove the square posts?
I did not go over your list very well either. Sounds like you are making progress Cheers
When possible we leave wire wraps* intact and desolder posts they are on from the board and then resolder the posts back onto the board when through.
In this case too little room to get at the underside of the board to desolder the posts, so I unwrapped the wires. Will solder back onto the posts when through. (The "sleeved wire" on the left was wrapped AND soldered so that one I removed the solder and then unwrapped.)
Picture to document wire placements as backup to hand-written diagram. Before detachments
Pictures of board up for work (film caps and three others are in), with tuner dial string (and variable capacitor pulley), taped up and tucked out-of-the-way. We take extra care not to touch the string with soldering iron when performing work. A severed string would mean restringing. Not something we want to tackle. Those glass things are telegraph pole insulators loosley placed to keep the lazy susan from turning. If you want some tips on recapping the tuner, see Xraytonyb's Youtube channel, three-part piece on the SX 939. There is a segment on doing the tuner.
* Wikipedia on wire wrap is interesting. https://en.wikipedia.org/wiki/Wire_wrap
In this case too little room to get at the underside of the board to desolder the posts, so I unwrapped the wires. Will solder back onto the posts when through. (The "sleeved wire" on the left was wrapped AND soldered so that one I removed the solder and then unwrapped.)
Picture to document wire placements as backup to hand-written diagram. Before detachments
Pictures of board up for work (film caps and three others are in), with tuner dial string (and variable capacitor pulley), taped up and tucked out-of-the-way. We take extra care not to touch the string with soldering iron when performing work. A severed string would mean restringing. Not something we want to tackle. Those glass things are telegraph pole insulators loosley placed to keep the lazy susan from turning. If you want some tips on recapping the tuner, see Xraytonyb's Youtube channel, three-part piece on the SX 939. There is a segment on doing the tuner.
* Wikipedia on wire wrap is interesting. https://en.wikipedia.org/wiki/Wire_wrap
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Tuner board is back in place. Sounds very good. Might be a little more 'hiss' than before. Cannot tell. Even had we not done the tuner-recap, a receiver of this age would benefit from a bit of alignment-tweaking.
MAAS Metal Polish on the tuning capacitor housing.
MAAS Metal Polish on the tuning capacitor housing.
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- Changed out the three capacitors in the "Muting Assembly" and the one capacitor in the "Lighting Board."
- Hooked up the dummy loads and let it idle for an hour.
- Set the idle and bias. NOTE: 25mV which is DIFFERENT THAN MANUAL SPECS -- see Larryderouin post #2).
- Put the bottom and top covers back on.
- Hooked up an antenna and speakers and listed to my favorite (FM), station 91.3 WYEP.
- My significant other came into the lab and made me turn it down.
- Took this picture for you.
In the next couple days I will go back through this thread and clean up the parts lists to reflect what actually went in. I think it turned out great. Will be getting an alignment.
Thanks everyone for your help and support. Had a blast and couldn't have done it without you!
Thanks again!!!
- Hooked up the dummy loads and let it idle for an hour.
- Set the idle and bias. NOTE: 25mV which is DIFFERENT THAN MANUAL SPECS -- see Larryderouin post #2).
- Put the bottom and top covers back on.
- Hooked up an antenna and speakers and listed to my favorite (FM), station 91.3 WYEP.
- My significant other came into the lab and made me turn it down.
- Took this picture for you.
In the next couple days I will go back through this thread and clean up the parts lists to reflect what actually went in. I think it turned out great. Will be getting an alignment.
Thanks everyone for your help and support. Had a blast and couldn't have done it without you!
Thanks again!!!
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Oldsansui441
Super Member
That looks great, nice work all round 
. Thanks for all of your detailed photos and for keeping us all updated with your progress.
. Thanks for all of your detailed photos and for keeping us all updated with your progress.
Pioneer SX 939 Repair and Restore -- Actual Parts Installed
PLEASE NOTE: suggestions in POST #100 are now reflected in the below parts list. Thanks.
AWR-052-0 Power Supply
AWR-052 C11 47uf 63v cea up it to 100V 647-UPW2A470MPD
AWR-052 C12 47uf 50v cea up it to 100V 647-UPW2A470MPD
AWR-052 C13 470uf 80v ach-038 up it to 100V 647-UPW2A471MHD
AWR-052 C14 470uf 80v ach-038 up it to 100V 647-UPW2A471MHD
AWR-052 C15 100uf 63v cea up it to 80V 647-UPM1K101MPD
AWR-052 C16 100uf 63v cea up it to 80V 647-UPM1K101MPD
AWR-052 C17 47uf 16v cea up it to 25V 647-UPW1E470MDD
AWR-052 C18 47uf 16v cea up it to 25V 647-UPW1E470MDD
AWR-052 C21 47uf 50v cea up it to 100V 647-UPW2A470MPD
AWR-052 C22 2200uf 10v cea up it to 25V 647-UPW1E222MHD
AWR-052 C23 220uf 16v cea up it to 25V 647-UPW1E221MPD
AWR-052 C24 1000uf 35v ach-039 647-UPW1V102MHD
Q1 2SD313 512-MJE3055TTU
Q2 2SC1318 512-KSC2383YTA
Q3 2SC1318 512-KSC2383YTA
Q4 2SB507 511-MJE2955T
Q5 2SA720 512-KSA916YTA
Q6 2SD313 512-MJE3055TTU
R10 2.7K 1W 281-2.7K-RC
R11 820Ohm 2W 262-820-RC
R11 820Ohm 2W 262-820-RC
Filter Caps
C1 10000UF 50V 10000uF 63V 647-LKG1J103MKN
C2 10000UF 50V 10000uF 63V 647-LKG1J103MKN
667-ECQ-E2473JB .047uF 250V (2)
(…added a film capacitor bypass across each of the two power supply filter capacitor terminals "for improved HF filtering")
AWM-062-0 Protection Circuit
AWM-062 C1 .22uf 10v cssa up it to 63V 505-MKS2C032201BKI00
AWM-062 C2 .22uf 10v cssa up it to 63V 505-MKS2C032201BKI00
AWM-062 C3 330uf 6v cea up it to 10V 647-UPW1A331MPD
AWM-062 C4 330uf 6v cea up it to 10V 647-UPW1A331MPD
AWM-062 C5 4.7uf 25v cea up it to 35V 647-UPW1V4R7MDD
AWM-062 C6 100uf 16v cea up it to 25V 647-UPW1E101MED
Q1 2SC869 512- KSC1845FTA
Q2 2SC869 512- KSC1845FTA
Q3 2SC945 512- KSC1845FTA
Q4 2SC945 512- KSC1845FTA
Q5 2SA733 512- KSA992FBU
Q6 2SC945 512- KSC2383YTA
Q7 2SC1384 512- KSC2690AYS
Relay 653-MY2-DC24
Clip 528-16-782C1
Flyback Diode Modification 863-1N4004RLG
Added 1N4004 flyback diode mounted across relay pins in an equivalent configuration to diode between pins 9 (anode +) and 10 (cathode -) i.e. banded side to 10.
AWH-030 Power Amplifier
AWH-030 C1 .47uf 25v cssa 505-MKS2.47/50/10T
AWH-030 C2 .47uf 25v cssa 505-MKS2.47/50/10T
AWH-030 C3 1uf 25v cssa 505-MKS2B041001C00MF
AWH-030 C4 1uf 25v cssa 505-MKS2B041001C00MF
AWH-030 C5 33uf 16v cea 647-UPW1C330MDD
AWH-030 C6 33uf 16v cea 647-UPW1C330MDD
AWH-030 C11 330uf 10v cea 647-UPW1A331MPD
AWH-030 C12 330uf 10v cea 647-UPW1A331MPD
Q1-4 2SA725* 512-KSA992FBU (4) (had 763 in these spots not 725)
Q5 52SB527 610-2N6126 Q6 2SB527 610-2N6126
Q7 2sc1451 512-KSC3503DSTU
Q8 2sc1451 512-KSC3503DSTU
VR1-2 10K Trimmer 652-3296Y-1-103LF (2) multi-turn
VR2-3 100Ohm Trimmer 652-3296Y-1-101LF (2) multi-turn
Equalizer Amplifier
C1-2 cssa 2.2uF 25V 505-MKS22.2/50/5 50V (2)
C5-6 ceanl 470uF 6.3V* 647-UKL0J471MPD 6.3V (2)
C9-10 ceanl 100uF 10V* 647-UKL1E101KPDANATA 25V (2)
C11-12 ceanl 10uF 25V* 647-UKL1E100MDDANA 25V (2)
C19-20 ceanl 100uF 25V 647-UKL1E101KPDANATA 25V (2)
C21 ceanl 220uF 16V 647-UKL1C221KPDANA 16V
Q1-4 2SA725* 512-KSA992FBU (4) had 2SA763 in these spots not 2SA725
Q5-8 2SC1313 512-KSC1845EBU (4)
Control Amplifier
C1-2 cssa .33uF 25V 80-MMK5334M50J01L4 50V (2)
C7-8 cea 100uF 10V 647-UPW1E101MED 25V (2)
C13-14 cssa 2.2uF 25V 80-R82CC4220Z370J 50V (2)
C15-16 cea 4.7uF 35V* 647-UPW1H4R7MDD 50V (2)
C23-24 ceanl 4.7uF 25V 80-R82CC4470Z330K 50V (2)
C25-26 cea 10uF 16V 647-UPW1E100MDD6 25V (2)
C29-30 cea 100uF 10V 647-UPW1E101MED 25V (2)
C31-32 cea 4.7uF 35V* 647-UPW1H4R7MDD 50V (2)
C39-40 ceanl 4.7uF 25V 80-R82CC4470Z330K 50V (2)
C41-42 cea 10uF 16V 647-UPW1E100MDD6 25V (2)
C45-46 cea 100uF 10V 647-UPW1E101MED 25V (2)
C47-48 cssa 2.2uF 25V 80-R82CC4220Z370J 50V (2)
C49-52 cea 47uF* 16V 647-UPW1E470MDD 25V (4) manual specs 100uF but 47uF actual
Q1-2 2SA725 512-KSA992FBU
Q3-8 2SC1312 512-KSC1845EBU
Tuner
C22 cea 4.7uF 25V 647-UPW1V4R7MDD 35V
C24 cea 10uF 16V 22uF 647-UKA1C220MDD1TD
C25 cea .47uF 50V 80-MMK5474K50J01L4 50V
C26 cea 10uF 16V 22uF 647-UKA1C220MDD1TD
C31 cea 1uF 50V 80-R82CC4100AA60J 50V
C33 cea 100uF 16V 647-UPW1C101MED1TD
C34 cea 47uF 16V 647-UPW1E470MDD 25V
C37 cssa .33uF 25V 80-MMK5334K50J01L4 50V
C38 cssa 1uF 10V 80-R82CC4100AA60J 50V
C39 cssa .47uF 25V 80-MMK5474K50J01L4 50V
C42 cea 100uF 16V 647-UKL1E101KPDANATA 25V
C43-44 cea 2.2uF 50V* 647-UKL1H2R2KDDANA 50V (2)
C45-46 cea .47uF 50V 22uF 16V 647-UKA1C220MDD1TD
C52 cea 4.7uF 25V 647-UPW1V4R7MDD 35V
C53 cea 47uF 10V* 647-UPW1E470MDD 25V (failed order so instead ECE-A1EKA470 had on-hand)
C58 cea 10uF 16V 647-UPW1E100MDD6 25V
C60 cssa .1uF 25V 80-MMK5104J50J01TR18 50V
C63 cea 220uF 16V 647-UPW1C221MPD1TA
Q11,12 2SA763 KSA992F
Q13,14 2SC945 KSC1845F
Muting Assembly
C1-2 cea 4.7uF 25V 647-UPW1V4R7MDD 35V (2)
C3 cssa 1uF 25V 647-UKL2A010KDD 100V (no 50V in stock)
Lamp Board
220uF 16V 647-UPW1C221MPD 25V
*different actual in unit than specs in service manual
PLEASE NOTE: suggestions in POST #100 are now reflected in the below parts list. Thanks.
AWR-052-0 Power Supply
AWR-052 C11 47uf 63v cea up it to 100V 647-UPW2A470MPD
AWR-052 C12 47uf 50v cea up it to 100V 647-UPW2A470MPD
AWR-052 C13 470uf 80v ach-038 up it to 100V 647-UPW2A471MHD
AWR-052 C14 470uf 80v ach-038 up it to 100V 647-UPW2A471MHD
AWR-052 C15 100uf 63v cea up it to 80V 647-UPM1K101MPD
AWR-052 C16 100uf 63v cea up it to 80V 647-UPM1K101MPD
AWR-052 C17 47uf 16v cea up it to 25V 647-UPW1E470MDD
AWR-052 C18 47uf 16v cea up it to 25V 647-UPW1E470MDD
AWR-052 C21 47uf 50v cea up it to 100V 647-UPW2A470MPD
AWR-052 C22 2200uf 10v cea up it to 25V 647-UPW1E222MHD
AWR-052 C23 220uf 16v cea up it to 25V 647-UPW1E221MPD
AWR-052 C24 1000uf 35v ach-039 647-UPW1V102MHD
Q1 2SD313 512-MJE3055TTU
Q2 2SC1318 512-KSC2383YTA
Q3 2SC1318 512-KSC2383YTA
Q4 2SB507 511-MJE2955T
Q5 2SA720 512-KSA916YTA
Q6 2SD313 512-MJE3055TTU
R10 2.7K 1W 281-2.7K-RC
R11 820Ohm 2W 262-820-RC
R11 820Ohm 2W 262-820-RC
Filter Caps
C1 10000UF 50V 10000uF 63V 647-LKG1J103MKN
C2 10000UF 50V 10000uF 63V 647-LKG1J103MKN
667-ECQ-E2473JB .047uF 250V (2)
(…added a film capacitor bypass across each of the two power supply filter capacitor terminals "for improved HF filtering")
AWM-062-0 Protection Circuit
AWM-062 C1 .22uf 10v cssa up it to 63V 505-MKS2C032201BKI00
AWM-062 C2 .22uf 10v cssa up it to 63V 505-MKS2C032201BKI00
AWM-062 C3 330uf 6v cea up it to 10V 647-UPW1A331MPD
AWM-062 C4 330uf 6v cea up it to 10V 647-UPW1A331MPD
AWM-062 C5 4.7uf 25v cea up it to 35V 647-UPW1V4R7MDD
AWM-062 C6 100uf 16v cea up it to 25V 647-UPW1E101MED
Q1 2SC869 512- KSC1845FTA
Q2 2SC869 512- KSC1845FTA
Q3 2SC945 512- KSC1845FTA
Q4 2SC945 512- KSC1845FTA
Q5 2SA733 512- KSA992FBU
Q6 2SC945 512- KSC2383YTA
Q7 2SC1384 512- KSC2690AYS
Relay 653-MY2-DC24
Clip 528-16-782C1
Flyback Diode Modification 863-1N4004RLG
Added 1N4004 flyback diode mounted across relay pins in an equivalent configuration to diode between pins 9 (anode +) and 10 (cathode -) i.e. banded side to 10.
AWH-030 Power Amplifier
AWH-030 C1 .47uf 25v cssa 505-MKS2.47/50/10T
AWH-030 C2 .47uf 25v cssa 505-MKS2.47/50/10T
AWH-030 C3 1uf 25v cssa 505-MKS2B041001C00MF
AWH-030 C4 1uf 25v cssa 505-MKS2B041001C00MF
AWH-030 C5 33uf 16v cea 647-UPW1C330MDD
AWH-030 C6 33uf 16v cea 647-UPW1C330MDD
AWH-030 C11 330uf 10v cea 647-UPW1A331MPD
AWH-030 C12 330uf 10v cea 647-UPW1A331MPD
Q1-4 2SA725* 512-KSA992FBU (4) (had 763 in these spots not 725)
Q5 52SB527 610-2N6126 Q6 2SB527 610-2N6126
Q7 2sc1451 512-KSC3503DSTU
Q8 2sc1451 512-KSC3503DSTU
VR1-2 10K Trimmer 652-3296Y-1-103LF (2) multi-turn
VR2-3 100Ohm Trimmer 652-3296Y-1-101LF (2) multi-turn
Equalizer Amplifier
C1-2 cssa 2.2uF 25V 505-MKS22.2/50/5 50V (2)
C5-6 ceanl 470uF 6.3V* 647-UKL0J471MPD 6.3V (2)
C9-10 ceanl 100uF 10V* 647-UKL1E101KPDANATA 25V (2)
C11-12 ceanl 10uF 25V* 647-UKL1E100MDDANA 25V (2)
C19-20 ceanl 100uF 25V 647-UKL1E101KPDANATA 25V (2)
C21 ceanl 220uF 16V 647-UKL1C221KPDANA 16V
Q1-4 2SA725* 512-KSA992FBU (4) had 2SA763 in these spots not 2SA725
Q5-8 2SC1313 512-KSC1845EBU (4)
Control Amplifier
C1-2 cssa .33uF 25V 80-MMK5334M50J01L4 50V (2)
C7-8 cea 100uF 10V 647-UPW1E101MED 25V (2)
C13-14 cssa 2.2uF 25V 80-R82CC4220Z370J 50V (2)
C15-16 cea 4.7uF 35V* 647-UPW1H4R7MDD 50V (2)
C23-24 ceanl 4.7uF 25V 80-R82CC4470Z330K 50V (2)
C25-26 cea 10uF 16V 647-UPW1E100MDD6 25V (2)
C29-30 cea 100uF 10V 647-UPW1E101MED 25V (2)
C31-32 cea 4.7uF 35V* 647-UPW1H4R7MDD 50V (2)
C39-40 ceanl 4.7uF 25V 80-R82CC4470Z330K 50V (2)
C41-42 cea 10uF 16V 647-UPW1E100MDD6 25V (2)
C45-46 cea 100uF 10V 647-UPW1E101MED 25V (2)
C47-48 cssa 2.2uF 25V 80-R82CC4220Z370J 50V (2)
C49-52 cea 47uF* 16V 647-UPW1E470MDD 25V (4) manual specs 100uF but 47uF actual
Q1-2 2SA725 512-KSA992FBU
Q3-8 2SC1312 512-KSC1845EBU
Tuner
C22 cea 4.7uF 25V 647-UPW1V4R7MDD 35V
C24 cea 10uF 16V 22uF 647-UKA1C220MDD1TD
C25 cea .47uF 50V 80-MMK5474K50J01L4 50V
C26 cea 10uF 16V 22uF 647-UKA1C220MDD1TD
C31 cea 1uF 50V 80-R82CC4100AA60J 50V
C33 cea 100uF 16V 647-UPW1C101MED1TD
C34 cea 47uF 16V 647-UPW1E470MDD 25V
C37 cssa .33uF 25V 80-MMK5334K50J01L4 50V
C38 cssa 1uF 10V 80-R82CC4100AA60J 50V
C39 cssa .47uF 25V 80-MMK5474K50J01L4 50V
C42 cea 100uF 16V 647-UKL1E101KPDANATA 25V
C43-44 cea 2.2uF 50V* 647-UKL1H2R2KDDANA 50V (2)
C45-46 cea .47uF 50V 22uF 16V 647-UKA1C220MDD1TD
C52 cea 4.7uF 25V 647-UPW1V4R7MDD 35V
C53 cea 47uF 10V* 647-UPW1E470MDD 25V (failed order so instead ECE-A1EKA470 had on-hand)
C58 cea 10uF 16V 647-UPW1E100MDD6 25V
C60 cssa .1uF 25V 80-MMK5104J50J01TR18 50V
C63 cea 220uF 16V 647-UPW1C221MPD1TA
Q11,12 2SA763 KSA992F
Q13,14 2SC945 KSC1845F
Muting Assembly
C1-2 cea 4.7uF 25V 647-UPW1V4R7MDD 35V (2)
C3 cssa 1uF 25V 647-UKL2A010KDD 100V (no 50V in stock)
Lamp Board
220uF 16V 647-UPW1C221MPD 25V
*different actual in unit than specs in service manual
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EDIT: Picture of tuner board after going back in and making some changes. Modifications suggested by rcs16 in Post #100. Light blue caps are the UKA 22uF additions. Fired her up. Sounded great. The four (4) transistors replaced. Did not thrown off the alignment. As far as I can tell. Will report back later if any negative effects evident--when I have a chance to tune up and down the dial. Thanks.
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I am sure what you used will work just fine, I am only making suggestions for options. The parts selection you made certainly is an upgrade from the original parts. The unit must sound nice. beautiful shape, show room condition.
Usually you do not need a alignment after re-capping the tuner. check for good sensitivity (low,mid,high band), tunes/mutes symmetrical to center, centers tuning meter off station (white noise), stereo light works symmetrical as you tune off center, dial is close to being exact, good to go. Enjoy
Thank you. My thinking at the time was as you say. Figured it would be fine.
I like many of Conrad Hoffman's ideas. He would agree with us there.
At the same time I know you understand there is another part of me that finds it hard to tolerate my not having the patience and fortitude to look at the schematic and see that those couple of capacitors in the tuner circuits were so clearly audio signal flow. Sigh.
Thanks on the tuner tips. I will do those check points.
Might do the transistor change outs, too. Had good luck with a Pioneer SX737. Transistor substitions didn't throw it off.
I like many of Conrad Hoffman's ideas. He would agree with us there.
At the same time I know you understand there is another part of me that finds it hard to tolerate my not having the patience and fortitude to look at the schematic and see that those couple of capacitors in the tuner circuits were so clearly audio signal flow. Sigh.
Thanks on the tuner tips. I will do those check points.
Might do the transistor change outs, too. Had good luck with a Pioneer SX737. Transistor substitions didn't throw it off.
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A little housekeeping. Referring back to Post #100.
Do I have this right.
Could you mention rationale for Q11,12. (For Q13.14 rationale was improvement to less noisy.)
Tuner
Q11,12 2SA763 KSA992F
Q13,14 2SC945 KSC1845F
Transistors designed for low level low noise applications, such as KSA992,KSC1845 vs 2SA763(KSA733C),KSC945C complementary pairs which are general purpose devices. iirc the KSA733C,KSC945C datasheets do not publish noise data, which is a hint, but to be honest the KSA733C,KSC945C are fine in your application since that is what they chose. KSA992,KSC1845 I would call a bit of an upgrade. The rational for using 2SA763,2SC945 might be to use common parts as used on the same and other assemblies.
Post #111 has been edited. I went back in and made the changes to the tuner. Thanks.
While I'm at it, want to mention in the interim got me a new screwdriver. Never knew until last week there was a difference between Phillips and screws commonly founded in Asian manufactured machines known as JIS (Japanese Industrial Standard). Quite a difference.
If this is new to you, too, you got to get you a JIS driver. I'm so excited I got me some bits and a right angle ratcheting driver coming from overseas, too. All Vessel stuff.
Anyway if you would like learn more read the post by LBPete The Joy of a Japanese Screwdriver. It's wonderful.
Not sure you will be able to discern in the below picture, these screws, used in the tuner board of the SX 939, have the characteristic 'dot' (see lower side head of both screws), that positively IDs a JIS screw. You can see this is the #2 size setup for the screwdriver. Similar to Phillips you will most use #1 and #2.
While I'm at it, want to mention in the interim got me a new screwdriver. Never knew until last week there was a difference between Phillips and screws commonly founded in Asian manufactured machines known as JIS (Japanese Industrial Standard). Quite a difference.
If this is new to you, too, you got to get you a JIS driver. I'm so excited I got me some bits and a right angle ratcheting driver coming from overseas, too. All Vessel stuff.
Anyway if you would like learn more read the post by LBPete The Joy of a Japanese Screwdriver. It's wonderful.
Not sure you will be able to discern in the below picture, these screws, used in the tuner board of the SX 939, have the characteristic 'dot' (see lower side head of both screws), that positively IDs a JIS screw. You can see this is the #2 size setup for the screwdriver. Similar to Phillips you will most use #1 and #2.
Affirmative.
If memory serves did my homework. Pretty confident you will be good-to-go with KSC1845FTA in both Q1, Q2 and Q3, Q4.
If you want to be doubly sure you could post up a thread on the Pioneer forum including the question. Others may be more likely to see it and chime in.
I haven't put a bunch of hours on the machine but it's been good so far.
Thanks.
If memory serves did my homework. Pretty confident you will be good-to-go with KSC1845FTA in both Q1, Q2 and Q3, Q4.
If you want to be doubly sure you could post up a thread on the Pioneer forum including the question. Others may be more likely to see it and chime in.
I haven't put a bunch of hours on the machine but it's been good so far.
Thanks.
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