Teac a4010su playback problem
- Thread starter Moehn
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rojoknox
Well-Known Member
Greetings from RojoLand!
First off, you need to replace all those gray tubular Suzuki 0.1 µF 400 V "oil capacitors." There are around a dozen or so in this set. Four of them are visible in your picture; they're mounted on the brake assembly (between the reel tables), the pinch-roller solenoid (under the supply reel table) and the shutoff-lever switch (under the take-up reel table). There are more behind the control-button assembly, and several more inside the deck which could instead be a potted unit. They tend to fail short, and in some situations will go Pop-BANG! and spew their guts (phew!). A shorted Suzuki-bomb connected across a switch that's supposed to be open can cause your symptom. Replace all of them with 0.1 µF 630 V tubular film capacitors, or Y2-rated caps of the same value, or dedicated "snubber units" which combine a 0.1 µF cap and a small resistor (120 ohm or near that) in one unit.
I'm assuming you are testing the machine with a tape. Without tape, it's normal for the reel motors to run fast. Also, does the pinch-roller lever move freely and fully press the pinch roller against the capstan? Old grease that's become sticky and binding up the pinch-roller lever is a common issue on these decks.
What is your deck's serial number? (Metal label affixed to the cabinet back) Is your machine's record amplifier an RA-40S or the newer AR-40S? There are at least four different schematics for the A-4010 series, so this information will point to the right one.
Take care,
—
J. E. Knox "The Victor Freak"
Current caretaker of A-4010S S/N 48104
First off, you need to replace all those gray tubular Suzuki 0.1 µF 400 V "oil capacitors." There are around a dozen or so in this set. Four of them are visible in your picture; they're mounted on the brake assembly (between the reel tables), the pinch-roller solenoid (under the supply reel table) and the shutoff-lever switch (under the take-up reel table). There are more behind the control-button assembly, and several more inside the deck which could instead be a potted unit. They tend to fail short, and in some situations will go Pop-BANG! and spew their guts (phew!). A shorted Suzuki-bomb connected across a switch that's supposed to be open can cause your symptom. Replace all of them with 0.1 µF 630 V tubular film capacitors, or Y2-rated caps of the same value, or dedicated "snubber units" which combine a 0.1 µF cap and a small resistor (120 ohm or near that) in one unit.
I'm assuming you are testing the machine with a tape. Without tape, it's normal for the reel motors to run fast. Also, does the pinch-roller lever move freely and fully press the pinch roller against the capstan? Old grease that's become sticky and binding up the pinch-roller lever is a common issue on these decks.
What is your deck's serial number? (Metal label affixed to the cabinet back) Is your machine's record amplifier an RA-40S or the newer AR-40S? There are at least four different schematics for the A-4010 series, so this information will point to the right one.
Take care,
—
J. E. Knox "The Victor Freak"
Current caretaker of A-4010S S/N 48104
Is that an O ring instead of a flat belt for the capstan? Hard to tell with my old eyes.
I didn’t have the right belt on hand so I just threw a rubber band just to get it going for a bit
It’s a ar 40su. I replaced a blown fuse and everything started to work so I went to record some tape and one of those Suzuki caps blew taking out the new fuse with it. Next time I’m working on it I’ll send the s/n. Some components on the inside were dated 2/68. Thanks
Last edited:
rojoknox
Well-Known Member
Greetings from RojoLand!
You have one of the later A-4010S units with the delay circuit (when going from FWD to REV play, the deck will pause, reverse the capstan motor, then release pause and begin reverse play). Here's the service manual you'll need: https://archive.org/details/teacservicea401000unse
(There are several download options. Download the PDF file.)
Welcome to the Blown-Up-Suzuki-Bomb Club! Nasty, aren't they?
Take care,
—
J. E. Knox "The Victor Freak"
You have one of the later A-4010S units with the delay circuit (when going from FWD to REV play, the deck will pause, reverse the capstan motor, then release pause and begin reverse play). Here's the service manual you'll need: https://archive.org/details/teacservicea401000unse
(There are several download options. Download the PDF file.)
Welcome to the Blown-Up-Suzuki-Bomb Club! Nasty, aren't they?
Take care,
—
J. E. Knox "The Victor Freak"
Once I get all those replaced I’ll have to test for audio since I haven’t gotten the chance yet. Hopefully the amp is fine even though it’s probably not. Once it gets going I may try to sell it to fund the model my grandfather had back in Taiwan during Vietnam. Maybe you’ll be able to tell me what deck this is? Thanks, Moehn
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